| /******************************************************************************* |
| * Copyright 2017, Fraunhofer SIT sponsored by Infineon Technologies AG |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| *******************************************************************************/ |
| |
| #define _GNU_SOURCE |
| |
| #include <gcrypt.h> |
| #include <stdio.h> |
| |
| #include "tss2_esys.h" |
| |
| #include "esys_crypto.h" |
| #include "esys_iutil.h" |
| #include "esys_mu.h" |
| #define LOGMODULE esys |
| #include "util/log.h" |
| |
| /** Context to hold temporary values for iesys_crypto */ |
| typedef struct _IESYS_CRYPTO_CONTEXT { |
| enum { |
| IESYS_CRYPTOGCRY_TYPE_HASH = 1, |
| IESYS_CRYPTOGCRY_TYPE_HMAC, |
| } type; /**< The type of context to hold; hash or hmac */ |
| union { |
| struct { |
| gcry_md_hd_t gcry_context; |
| int gcry_hash_alg; |
| size_t hash_len; |
| } hash; /**< the state variables for a hash context */ |
| struct { |
| gcry_mac_hd_t gcry_context; |
| int gcry_hmac_alg; |
| size_t hmac_len; |
| } hmac; /**< the state variables for an hmac context */ |
| }; |
| } IESYS_CRYPTOGCRY_CONTEXT; |
| |
| /** Provide the digest size for a given hash algorithm. |
| * |
| * This function provides the size of the digest for a given hash algorithm. |
| * |
| * @param[in] hashAlg The hash algorithm to get the size for. |
| * @param[out] size The side of a digest of the hash algorithm. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_VALUE if hashAlg is unknown or unsupported. |
| */ |
| TSS2_RC |
| iesys_crypto_hash_get_digest_size(TPM2_ALG_ID hashAlg, size_t * size) |
| { |
| LOG_TRACE("call: hashAlg=%"PRIu16" size=%p", hashAlg, size); |
| if (size == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| switch (hashAlg) { |
| case TPM2_ALG_SHA1: |
| *size = TPM2_SHA1_DIGEST_SIZE; |
| break; |
| case TPM2_ALG_SHA256: |
| *size = TPM2_SHA256_DIGEST_SIZE; |
| break; |
| case TPM2_ALG_SHA384: |
| *size = TPM2_SHA384_DIGEST_SIZE; |
| break; |
| case TPM2_ALG_SHA512: |
| *size = TPM2_SHA512_DIGEST_SIZE; |
| break; |
| case TPM2_ALG_SM3_256: |
| *size = TPM2_SM3_256_DIGEST_SIZE; |
| break; |
| default: |
| LOG_ERROR("Unsupported hash algorithm (%"PRIu16")", hashAlg); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| LOG_TRACE("return: *size=%zu", *size); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Provide the context for the computation of a hash digest. |
| * |
| * The context will be created and initialized according to the hash function. |
| * @param[out] context The created context (callee-allocated). |
| * @param[in] hashAlg The hash algorithm for the creation of the context. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_VALUE or TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_MEMORY Memory cannot be allocated. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_start(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| TPM2_ALG_ID hashAlg) |
| { |
| LOG_TRACE("call: context=%p hashAlg=%"PRIu16, context, hashAlg); |
| return_if_null(context, "Context is NULL", TSS2_ESYS_RC_BAD_REFERENCE); |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext; |
| mycontext = calloc(1, sizeof(IESYS_CRYPTOGCRY_CONTEXT)); |
| return_if_null(mycontext, "Out of Memory", TSS2_ESYS_RC_MEMORY); |
| mycontext->type = IESYS_CRYPTOGCRY_TYPE_HASH; |
| |
| switch (hashAlg) { |
| case TPM2_ALG_SHA1: |
| mycontext->hash.gcry_hash_alg = GCRY_MD_SHA1; |
| break; |
| case TPM2_ALG_SHA256: |
| mycontext->hash.gcry_hash_alg = GCRY_MD_SHA256; |
| break; |
| case TPM2_ALG_SHA384: |
| mycontext->hash.gcry_hash_alg = GCRY_MD_SHA384; |
| break; |
| default: |
| LOG_ERROR("Unsupported hash algorithm (%"PRIu16")", hashAlg); |
| free(mycontext); |
| return TSS2_ESYS_RC_NOT_IMPLEMENTED; |
| } |
| int hash_len = gcry_md_get_algo_dlen(mycontext->hash.gcry_hash_alg); |
| if (hash_len <= 0) { |
| LOG_ERROR("Unsupported hash algorithm (%"PRIu16")", hashAlg); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| mycontext->hash.hash_len = hash_len; |
| |
| gcry_error_t r = gcry_md_open(&mycontext->hash.gcry_context, |
| mycontext->hash.gcry_hash_alg, 0); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| if (context == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| *context = (IESYS_CRYPTO_CONTEXT_BLOB *) mycontext; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update the digest value of a digest object from a byte buffer. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] buffer The data for the update. |
| * @param[in] size The size of the data buffer. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_update(IESYS_CRYPTO_CONTEXT_BLOB * context, |
| const uint8_t * buffer, size_t size) |
| { |
| LOG_TRACE("called for context %p, buffer %p and size %zd", context, buffer, |
| size); |
| if (context == NULL || buffer == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = (IESYS_CRYPTOGCRY_CONTEXT *) context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HASH) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| LOGBLOB_TRACE(buffer, size, "Updating hash with"); |
| |
| gcry_md_write(mycontext->hash.gcry_context, buffer, size); |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update the digest value of a digest object from a TPM2B object. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] b The TPM2B object for the update. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_update2b(IESYS_CRYPTO_CONTEXT_BLOB * context, TPM2B * b) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, b); |
| if (context == NULL || b == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| TSS2_RC ret = iesys_cryptogcry_hash_update(context, &b->buffer[0], b->size); |
| return ret; |
| } |
| |
| /** Get the digest value of a digest object and close the context. |
| * |
| * The digest value will written to a passed buffer and the resources of the |
| * digest object are released. |
| * @param[in,out] context The context of the digest object to be released |
| * @param[out] buffer The buffer for the digest value (caller-allocated). |
| * @param[out] size The size of the digest. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_finish(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| uint8_t * buffer, size_t * size) |
| { |
| LOG_TRACE("called for context-pointer %p, buffer %p and size-pointer %p", |
| context, buffer, size); |
| if (context == NULL || *context == NULL || buffer == NULL || size == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HASH) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| if (*size < mycontext->hash.hash_len) { |
| LOG_ERROR("Buffer too small"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| uint8_t *cpHash = gcry_md_read(mycontext->hash.gcry_context, |
| mycontext->hash.gcry_hash_alg); |
| if (cpHash == NULL) { |
| LOG_ERROR("GCry error."); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| LOGBLOB_TRACE(cpHash, mycontext->hash.hash_len, "read hash result"); |
| |
| *size = mycontext->hash.hash_len; |
| memmove(buffer, cpHash, *size); |
| |
| gcry_md_close(mycontext->hash.gcry_context); |
| |
| free(mycontext); |
| *context = NULL; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Get the digest value of a digest object and close the context. |
| * |
| * The digest value will written to a passed TPM2B object and the |
| * digest object are released. |
| * @param[in,out] context The context of the digest object to be released |
| * @param[out] b The TPM2B object for the digest (caller-allocated). |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_finish2b(IESYS_CRYPTO_CONTEXT_BLOB ** context, TPM2B * b) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, b); |
| if (context == NULL || *context == NULL || b == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| size_t s = b->size; |
| TSS2_RC ret = iesys_cryptogcry_hash_finish(context, &b->buffer[0], &s); |
| b->size = s; |
| return ret; |
| } |
| |
| /** Release the resources of a digest object. |
| * |
| * The assigned resources will be released and the context will be set to NULL. |
| * @param[in,out] context The context of the digest object. |
| */ |
| void |
| iesys_cryptogcry_hash_abort(IESYS_CRYPTO_CONTEXT_BLOB ** context) |
| { |
| LOG_TRACE("called for context-pointer %p", context); |
| if (context == NULL || *context == NULL) { |
| LOG_DEBUG("Null-Pointer passed"); |
| return; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| (IESYS_CRYPTOGCRY_CONTEXT *) * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HASH) { |
| LOG_DEBUG("bad context"); |
| return; |
| } |
| |
| gcry_md_close(mycontext->hash.gcry_context); |
| free(mycontext); |
| *context = NULL; |
| } |
| |
| /* HMAC */ |
| |
| /** Provide the context an HMAC digest object from a byte buffer key. |
| * |
| * The context will be created and initialized according to the hash function |
| * and the used HMAC key. |
| * @param[out] context The created context (callee-allocated). |
| * @param[in] hmacAlg The hash algorithm for the HMAC computation. |
| * @param[in] key The byte buffer of the HMAC key. |
| * @param[in] size The size of the HMAC key. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_MEMORY Memory cannot be allocated. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_start(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| TPM2_ALG_ID hmacAlg, |
| const uint8_t * key, size_t size) |
| { |
| TSS2_RC r; |
| |
| LOG_TRACE("called for context-pointer %p and hmacAlg %d", context, hmacAlg); |
| LOGBLOB_TRACE(key, size, "Starting hmac with"); |
| if (context == NULL || key == NULL) { |
| LOG_ERROR("Null-Pointer passed in for context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| calloc(1, sizeof(IESYS_CRYPTOGCRY_CONTEXT)); |
| if (mycontext == NULL) { |
| LOG_ERROR("Out of Memory"); |
| return TSS2_ESYS_RC_MEMORY; |
| } |
| |
| switch (hmacAlg) { |
| case TPM2_ALG_SHA1: |
| mycontext->hmac.gcry_hmac_alg = GCRY_MAC_HMAC_SHA1; |
| break; |
| case TPM2_ALG_SHA256: |
| mycontext->hmac.gcry_hmac_alg = GCRY_MAC_HMAC_SHA256; |
| break; |
| default: |
| LOG_ERROR("Unsupported hmac algo."); |
| free(mycontext); |
| return TSS2_ESYS_RC_NOT_IMPLEMENTED; |
| } |
| |
| int hmac_len = gcry_mac_get_algo_maclen(mycontext->hmac.gcry_hmac_alg); |
| if (hmac_len <= 0) { |
| LOG_ERROR("GCry error."); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| mycontext->type = IESYS_CRYPTOGCRY_TYPE_HMAC; |
| mycontext->hmac.hmac_len = hmac_len; |
| |
| r = gcry_mac_open(&mycontext->hmac.gcry_context, |
| mycontext->hmac.gcry_hmac_alg, 0, NULL); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| r = gcry_mac_setkey(mycontext->hmac.gcry_context, key, size); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| gcry_mac_close(mycontext->hmac.gcry_context); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| *context = (IESYS_CRYPTO_CONTEXT_BLOB *) mycontext; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Provide the context an HMAC digest object from a byte TPM2B key. |
| * |
| * The context will be created and initialized according to the hash function |
| * and the used HMAC key. |
| * @param[out] context The created context. |
| * @param[in] hmacAlg The hash algorithm for the HMAC computation. |
| * @param[in] key The TPM2B object of the HMAC key. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_MEMORY Memory cannot be allocated. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_start2b(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| TPM2_ALG_ID hmacAlg, TPM2B * key) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, key); |
| if (context == NULL || key == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| TSS2_RC ret = iesys_cryptogcry_hmac_start(context, hmacAlg, &key->buffer[0], |
| key->size); |
| return ret; |
| } |
| |
| /** Update and HMAC digest value from a byte buffer. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm and the key of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] buffer The data for the update. |
| * @param[in] size The size of the data buffer. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_update(IESYS_CRYPTO_CONTEXT_BLOB * context, |
| const uint8_t * buffer, size_t size) |
| { |
| LOG_TRACE("called for context %p, buffer %p and size %zd", |
| context, buffer, size); |
| if (context == NULL || buffer == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = (IESYS_CRYPTOGCRY_CONTEXT *) context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HMAC) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| LOGBLOB_TRACE(buffer, size, "Updating hmac with"); |
| |
| gcry_mac_write(mycontext->hmac.gcry_context, buffer, size); |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update and HMAC digest value from a TPM2B object. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm and the key of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] b The TPM2B object for the update. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_update2b(IESYS_CRYPTO_CONTEXT_BLOB * context, TPM2B * b) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, b); |
| if (context == NULL || b == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| TSS2_RC ret = iesys_cryptogcry_hmac_update(context, &b->buffer[0], b->size); |
| return ret; |
| } |
| |
| /** Write the HMAC digest value to a byte buffer and close the context. |
| * |
| * The digest value will written to a passed buffer and the resources of the |
| * HMAC object are released. |
| * @param[in,out] context The context of the HMAC object. |
| * @param[out] buffer The buffer for the digest value (caller-allocated). |
| * @param[out] size The size of the digest. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_BAD_SIZE If the size passed is lower than the HMAC length. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_finish(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| uint8_t * buffer, size_t * size) |
| { |
| LOG_TRACE("called for context-pointer %p, buffer %p and size-pointer %p", |
| context, buffer, size); |
| if (context == NULL || *context == NULL || buffer == NULL || size == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| (IESYS_CRYPTOGCRY_CONTEXT *) * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HMAC) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| if (*size < mycontext->hmac.hmac_len) { |
| LOG_ERROR("Buffer too small"); |
| return TSS2_ESYS_RC_BAD_SIZE; |
| } |
| |
| TSS2_RC r = gcry_mac_read(mycontext->hmac.gcry_context, buffer, size); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| LOGBLOB_TRACE(buffer, *size, "read hmac result"); |
| |
| gcry_mac_close(mycontext->hmac.gcry_context); |
| |
| free(mycontext); |
| *context = NULL; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Write the HMAC digest value to a TPM2B object and close the context. |
| * |
| * The digest value will written to a passed TPM2B object and the resources of |
| * the HMAC object are released. |
| * @param[in,out] context The context of the HMAC object. |
| * @param[out] hmac The buffer for the digest value (caller-allocated). |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_BAD_SIZE if the size passed is lower than the HMAC length. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_finish2b(IESYS_CRYPTO_CONTEXT_BLOB ** context, TPM2B * hmac) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, hmac); |
| if (context == NULL || *context == NULL || hmac == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| size_t s = hmac->size; |
| TSS2_RC ret = iesys_cryptogcry_hmac_finish(context, &hmac->buffer[0], &s); |
| hmac->size = s; |
| return ret; |
| } |
| |
| /** Release the resources of an HAMC object. |
| * |
| * The assigned resources will be released and the context will be set to NULL. |
| * @param[in,out] context The context of the HMAC object. |
| */ |
| void |
| iesys_cryptogcry_hmac_abort(IESYS_CRYPTO_CONTEXT_BLOB ** context) |
| { |
| LOG_TRACE("called for context-pointer %p", context); |
| if (context == NULL || *context == NULL) { |
| LOG_DEBUG("Null-Pointer passed"); |
| return; |
| } |
| if (*context != NULL) { |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| (IESYS_CRYPTOGCRY_CONTEXT *) * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HMAC) { |
| LOG_DEBUG("bad context"); |
| return; |
| } |
| |
| gcry_mac_close(mycontext->hmac.gcry_context); |
| |
| free(mycontext); |
| *context = NULL; |
| } |
| } |
| |
| /** Compute the command or response parameter hash. |
| * |
| * These hashes are needed for the computation of the HMAC used for the |
| * authorization of commands, or for the HMAC used for checking the responses. |
| * The name parameters are only used for the command parameter hash (cp) and |
| * must be NULL for the computation of the response parameter rp hash (rp). |
| * @param[in] alg The hash algorithm. |
| * @param[in] rcBuffer The response code in marshaled form. |
| * @param[in] ccBuffer The command code in marshaled form. |
| * @param[in] name1, name2, name3 The names associated with the corresponding |
| * handle. Must be NULL if no handle is passed. |
| * @param[in] pBuffer The byte buffer or the command or the response. |
| * @param[in] pBuffer_size The size of the command or response. |
| * @param[out] pHash The result digest. |
| * @param[out] pHash_size The size of the result digest. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| |
| TSS2_RC |
| iesys_crypto_pHash(TPM2_ALG_ID alg, |
| const uint8_t rcBuffer[4], |
| const uint8_t ccBuffer[4], |
| const TPM2B_NAME * name1, |
| const TPM2B_NAME * name2, |
| const TPM2B_NAME * name3, |
| const uint8_t * pBuffer, |
| size_t pBuffer_size, uint8_t * pHash, size_t * pHash_size) |
| { |
| LOG_TRACE("called"); |
| if (ccBuffer == NULL || pBuffer == NULL || pHash == NULL |
| || pHash_size == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| IESYS_CRYPTO_CONTEXT_BLOB *cryptoContext; |
| |
| TSS2_RC r = iesys_crypto_hash_start(&cryptoContext, alg); |
| return_if_error(r, "Error"); |
| |
| if (rcBuffer != NULL) { |
| r = iesys_crypto_hash_update(cryptoContext, &rcBuffer[0], 4); |
| goto_if_error(r, "Error", error); |
| } |
| |
| r = iesys_crypto_hash_update(cryptoContext, &ccBuffer[0], 4); |
| goto_if_error(r, "Error", error); |
| |
| if (name1 != NULL) { |
| r = iesys_crypto_hash_update2b(cryptoContext, (TPM2B *) name1); |
| goto_if_error(r, "Error", error); |
| } |
| |
| if (name2 != NULL) { |
| r = iesys_crypto_hash_update2b(cryptoContext, (TPM2B *) name2); |
| goto_if_error(r, "Error", error); |
| } |
| |
| if (name3 != NULL) { |
| r = iesys_crypto_hash_update2b(cryptoContext, (TPM2B *) name3); |
| goto_if_error(r, "Error", error); |
| } |
| |
| r = iesys_crypto_hash_update(cryptoContext, pBuffer, pBuffer_size); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hash_finish(&cryptoContext, pHash, pHash_size); |
| goto_if_error(r, "Error", error); |
| |
| return r; |
| |
| error: |
| iesys_crypto_hash_abort(&cryptoContext); |
| return r; |
| } |
| |
| /** Compute the HMAC for authorization. |
| * |
| * Based on the session nonces, caller nonce, TPM nonce, if used encryption and |
| * decryption nonce, the command parameter hash, and the session attributes the |
| * HMAC used for authorization is computed. |
| * @param[in] alg The hash algorithm used for HMAC computation. |
| * @param[in] hmacKey The HMAC key byte buffer. |
| * @param[in] hmacKeySize The size of the HMAC key byte buffer. |
| * @param[in] pHash The command parameter hash byte buffer. |
| * @param[in] pHash_size The size of the command parameter hash byte buffer. |
| * @param[in] nonceNewer The TPM nonce. |
| * @param[in] nonceOlder The caller nonce. |
| * @param[in] nonceDecrypt The decrypt nonce (NULL if not used). |
| * @param[in] nonceEncrypt The encrypt nonce (NULL if not used). |
| * @param[in] sessionAttributes The attributes used for the current |
| * authentication. |
| * @param[out] hmac The computed HMAC. |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE If a pointer is invalid. |
| */ |
| TSS2_RC |
| iesys_crypto_authHmac(TPM2_ALG_ID alg, |
| uint8_t * hmacKey, size_t hmacKeySize, |
| const uint8_t * pHash, |
| size_t pHash_size, |
| const TPM2B_NONCE * nonceNewer, |
| const TPM2B_NONCE * nonceOlder, |
| const TPM2B_NONCE * nonceDecrypt, |
| const TPM2B_NONCE * nonceEncrypt, |
| TPMA_SESSION sessionAttributes, TPM2B_AUTH * hmac) |
| { |
| LOG_TRACE("called"); |
| if (hmacKey == NULL || pHash == NULL || nonceNewer == NULL || |
| nonceOlder == NULL || hmac == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| uint8_t sessionAttribs[sizeof(sessionAttributes)]; |
| size_t sessionAttribs_size = 0; |
| |
| IESYS_CRYPTO_CONTEXT_BLOB *cryptoContext; |
| |
| TSS2_RC r = |
| iesys_crypto_hmac_start(&cryptoContext, alg, hmacKey, hmacKeySize); |
| return_if_error(r, "Error"); |
| |
| r = iesys_crypto_hmac_update(cryptoContext, pHash, pHash_size); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hmac_update2b(cryptoContext, (TPM2B *) nonceNewer); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hmac_update2b(cryptoContext, (TPM2B *) nonceOlder); |
| goto_if_error(r, "Error", error); |
| |
| if (nonceDecrypt != NULL) { |
| r = iesys_crypto_hmac_update2b(cryptoContext, (TPM2B *) nonceDecrypt); |
| goto_if_error(r, "Error", error); |
| } |
| |
| if (nonceEncrypt != NULL) { |
| r = iesys_crypto_hmac_update2b(cryptoContext, (TPM2B *) nonceEncrypt); |
| goto_if_error(r, "Error", error); |
| } |
| |
| r = Tss2_MU_TPMA_SESSION_Marshal(sessionAttributes, |
| &sessionAttribs[0], |
| sizeof(sessionAttribs), |
| &sessionAttribs_size); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hmac_update(cryptoContext, &sessionAttribs[0], |
| sessionAttribs_size); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hmac_finish2b(&cryptoContext, (TPM2B *) hmac); |
| goto_if_error(r, "Error", error); |
| |
| return r; |
| |
| error: |
| iesys_crypto_hmac_abort(&cryptoContext); |
| return r; |
| |
| } |
| |
| /** |
| * HMAC computation for inner loop of KDFa key derivation. |
| * |
| * Except of ECDH this function is used for key derivation. |
| * @param[in] alg The algorithm used for the HMAC. |
| * @param[in] hmacKey The hmacKey used in KDFa. |
| * @param[in] hmacKeySize The size of the HMAC key. |
| * @param[in] counter The curren iteration step. |
| * @param[in] label Indicates the use of the produced key. |
| * @param[in] contextU, contextV are used for construction of a binary string |
| * containing information related to the derived key. |
| * @param[in] bitlength The size of the generated key in bits. |
| * @param[out] hmac Byte buffer for the generated HMAC key (caller-allocated). |
| * @param[out] hmacSize Size of the generated HMAC key. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_crypto_KDFaHmac(TPM2_ALG_ID alg, |
| uint8_t * hmacKey, |
| size_t hmacKeySize, |
| uint32_t counter, |
| const char *label, |
| TPM2B_NONCE * contextU, |
| TPM2B_NONCE * contextV, |
| uint32_t bitlength, uint8_t * hmac, size_t * hmacSize) |
| { |
| LOG_TRACE("called"); |
| if (hmacKey == NULL || contextU == NULL || contextV == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| uint8_t buffer32[sizeof(uint32_t)]; |
| size_t buffer32_size = 0; |
| |
| IESYS_CRYPTO_CONTEXT_BLOB *cryptoContext; |
| |
| TSS2_RC r = |
| iesys_crypto_hmac_start(&cryptoContext, alg, hmacKey, hmacKeySize); |
| return_if_error(r, "Error"); |
| |
| r = Tss2_MU_UINT32_Marshal(counter, &buffer32[0], sizeof(UINT32), |
| &buffer32_size); |
| goto_if_error(r, "Marsahling", error); |
| r = iesys_crypto_hmac_update(cryptoContext, &buffer32[0], buffer32_size); |
| goto_if_error(r, "HMAC-Update", error); |
| |
| if (label != NULL) { |
| size_t lsize = strlen(label) + 1; |
| r = iesys_crypto_hmac_update(cryptoContext, (uint8_t *) label, lsize); |
| goto_if_error(r, "Error", error); |
| } |
| |
| r = iesys_crypto_hmac_update2b(cryptoContext, (TPM2B *) contextU); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hmac_update2b(cryptoContext, (TPM2B *) contextV); |
| goto_if_error(r, "Error", error); |
| |
| buffer32_size = 0; |
| r = Tss2_MU_UINT32_Marshal(bitlength, &buffer32[0], sizeof(UINT32), |
| &buffer32_size); |
| goto_if_error(r, "Marsahling", error); |
| r = iesys_crypto_hmac_update(cryptoContext, &buffer32[0], buffer32_size); |
| goto_if_error(r, "Error", error); |
| |
| r = iesys_crypto_hmac_finish(&cryptoContext, hmac, hmacSize); |
| goto_if_error(r, "Error", error); |
| |
| return r; |
| |
| error: |
| iesys_crypto_hmac_abort(&cryptoContext); |
| return r; |
| } |
| |
| /** |
| * KDFa Key derivation. |
| * |
| * Except of ECDH this function is used for key derivation. |
| * @param[in] hashAlg The hash algorithm to use. |
| * @param[in] hmacKey The hmacKey used in KDFa. |
| * @param[in] hmacKeySize The size of the HMAC key. |
| * @param[in] label Indicates the use of the produced key. |
| * @param[in] contextU, contextV are used for construction of a binary string |
| * containing information related to the derived key. |
| * @param[in] bitLength The size of generated key in bits. |
| * @param[in,out] counterInOut Counter for the KDFa iterations. If set, the |
| * value will be used for the firt iteration step. The final |
| * counter value will be written to counterInOut. |
| * @param[out] outKey Byte buffer for the derived key (caller-allocated). |
| * @param[in] use_digest_size Indicate whether the digest size of hashAlg is |
| * used as size of the generated key or the bitLength parameter is |
| * used. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_VALUE if hashAlg is unknown or unsupported. |
| */ |
| TSS2_RC |
| iesys_crypto_KDFa(TPM2_ALG_ID hashAlg, |
| uint8_t * hmacKey, |
| size_t hmacKeySize, |
| const char *label, |
| TPM2B_NONCE * contextU, |
| TPM2B_NONCE * contextV, |
| uint32_t bitLength, |
| uint32_t * counterInOut, |
| BYTE * outKey, |
| BOOL use_digest_size) |
| { |
| LOG_DEBUG("IESYS KDFa hmac key hashAlg: %i label: %s bitLength: %i", |
| hashAlg, label, bitLength); |
| if (counterInOut != NULL) |
| LOG_TRACE("IESYS KDFa hmac key counterInOut: %i", *counterInOut); |
| LOGBLOB_DEBUG(hmacKey, hmacKeySize, "IESYS KDFa hmac key"); |
| |
| LOGBLOB_DEBUG(&contextU->buffer[0], contextU->size, |
| "IESYS KDFa contextU key"); |
| LOGBLOB_DEBUG(&contextV->buffer[0], contextV->size, |
| "IESYS KDFa contextV key"); |
| BYTE *subKey = outKey; |
| UINT32 counter = 0; |
| INT32 bytes = 0; |
| size_t hlen = 0; |
| TSS2_RC r = iesys_crypto_hash_get_digest_size(hashAlg, &hlen); |
| return_if_error(r, "Error"); |
| if (counterInOut != NULL) |
| counter = *counterInOut; |
| bytes = use_digest_size ? hlen : (bitLength + 7) / 8; |
| LOG_DEBUG("IESYS KDFa hmac key bytes: %i", bytes); |
| |
| /* Fill outKey with results from KDFaHmac */ |
| for (; bytes > 0; subKey = &subKey[hlen], bytes = bytes - hlen) { |
| LOG_TRACE("IESYS KDFa hmac key bytes: %i", bytes); |
| /* if (bytes < (INT32)hlen) hlen = bytes; */ |
| counter++; |
| r = iesys_crypto_KDFaHmac(hashAlg, hmacKey, |
| hmacKeySize, counter, label, contextU, |
| contextV, bitLength, &subKey[0], &hlen); |
| return_if_error(r, "Error"); |
| } |
| if ((bitLength % 8) != 0) |
| outKey[0] &= ((1 << (bitLength % 8)) - 1); |
| if (counterInOut != NULL) |
| *counterInOut = counter; |
| LOGBLOB_DEBUG(outKey, (bitLength + 7) / 8, "IESYS KDFa key"); |
| return TPM2_RC_SUCCESS; |
| } |
| |
| /** Compute random TPM2B data. |
| * |
| * The random data will be generated and written to a passed TPM2B structure. |
| * @param[out] nonce The TPM2B structure for the random data (caller-allocated). |
| * @param[in] num_bytes The number of bytes to be generated. |
| * @retval TSS2_RC_SUCCESS on success. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_random2b(TPM2B_NONCE * nonce, size_t num_bytes) |
| { |
| if (num_bytes == 0) { |
| nonce->size = sizeof(TPMU_HA); |
| } else { |
| nonce->size = num_bytes; |
| } |
| /* |
| * possible values for random level: |
| * GCRY_WEAK_RANDOM GCRY_STRONG_RANDOM GCRY_VERY_STRONG_RANDOM |
| */ |
| gcry_randomize(&nonce->buffer[0], nonce->size, GCRY_STRONG_RANDOM); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Compute KDFe as described in TPM spec part 1 C 6.1 |
| * |
| * @param hashAlg [in] The nameAlg of the recipient key. |
| * @param Z [in] the x coordinate (xP) of the product (P) of a public point and a |
| * private key. |
| * @param label [in] KDF label. |
| * @param partyUInfo [in] The x-coordinate of the secret exchange value (Qe,U). |
| * @param partyVInfo [in] The x-coordinate of a public key (Qs,V). |
| * @param bit_size [in] Bit size of generated key. |
| * @param key [out] Key buffer. |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters |
| * @retval TSS2_ESYS_RC_MEMORY Memory cannot be allocated. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_KDFe(TPM2_ALG_ID hashAlg, |
| TPM2B_ECC_PARAMETER *Z, |
| const char *label, |
| TPM2B_ECC_PARAMETER *partyUInfo, |
| TPM2B_ECC_PARAMETER *partyVInfo, |
| UINT32 bit_size, |
| BYTE *key) |
| { |
| TSS2_RC r = TSS2_RC_SUCCESS; |
| size_t hash_len; |
| INT16 byte_size = (INT16)((bit_size +7) / 8); |
| BYTE *stream = key; |
| IESYS_CRYPTO_CONTEXT_BLOB *cryptoContext; |
| BYTE counter_buffer[4]; |
| UINT32 counter = 0; |
| size_t offset; |
| |
| LOG_DEBUG("IESYS KDFe hashAlg: %i label: %s bitLength: %i", |
| hashAlg, label, bit_size); |
| |
| if (partyUInfo != NULL) |
| LOGBLOB_DEBUG(&partyUInfo->buffer[0], partyUInfo->size, "partyUInfo"); |
| |
| if (partyVInfo != NULL) |
| LOGBLOB_DEBUG(&partyVInfo->buffer[0], partyVInfo->size, "partyVInfo"); |
| |
| r = iesys_crypto_hash_get_digest_size(hashAlg, &hash_len); |
| return_if_error(r, "Hash algorithm not supported."); |
| |
| if(hashAlg == TPM2_ALG_NULL || byte_size == 0) { |
| LOG_DEBUG("Bad parameters for KDFe"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| |
| /* Fill seed key with hash of counter, Z, label, partyUInfo, and partyVInfo */ |
| for (; byte_size > 0; stream = &stream[hash_len], byte_size = byte_size - hash_len) |
| { |
| counter ++; |
| r = iesys_crypto_hash_start(&cryptoContext, hashAlg); |
| return_if_error(r, "Error hash start"); |
| |
| offset = 0; |
| r = Tss2_MU_UINT32_Marshal(counter, &counter_buffer[0], 4, &offset); |
| goto_if_error(r, "Error marshaling counter", error); |
| |
| r = iesys_crypto_hash_update(cryptoContext, &counter_buffer[0], 4); |
| goto_if_error(r, "Error hash update", error); |
| |
| if (Z != NULL) { |
| r = iesys_crypto_hash_update2b(cryptoContext, (TPM2B *) Z); |
| goto_if_error(r, "Error hash update2b", error); |
| } |
| |
| if (label != NULL) { |
| size_t lsize = strlen(label) + 1; |
| r = iesys_crypto_hash_update(cryptoContext, (uint8_t *) label, lsize); |
| goto_if_error(r, "Error hash update", error); |
| } |
| |
| if (partyUInfo != NULL) { |
| r = iesys_crypto_hash_update2b(cryptoContext, (TPM2B *) partyUInfo); |
| goto_if_error(r, "Error hash update2b", error); |
| } |
| |
| if (partyVInfo != NULL) { |
| r = iesys_crypto_hash_update2b(cryptoContext, (TPM2B *) partyVInfo); |
| goto_if_error(r, "Error hash update2b", error); |
| } |
| r = iesys_crypto_hash_finish(&cryptoContext, (uint8_t *) stream, &hash_len); |
| goto_if_error(r, "Error", error); |
| } |
| LOGBLOB_DEBUG(key, bit_size/8, "Result KDFe"); |
| if((bit_size % 8) != 0) |
| key[0] &= ((1 << (bit_size % 8)) - 1); |
| return r; |
| |
| error: |
| iesys_crypto_hmac_abort(&cryptoContext); |
| return r; |
| } |
| |
| /** Encryption of a buffer using a public (RSA) key. |
| * |
| * Encrypting a buffer using a public key is used for example during |
| * Esys_StartAuthSession in order to encrypt the salt value. |
| * @param[in] key The key to be used for encryption. |
| * @param[in] in_size The size of the buffer to be encrypted. |
| * @param[in] in_buffer The data buffer to be encrypted. |
| * @param[in] max_out_size The maximum size for the output encrypted buffer. |
| * @param[out] out_buffer The encrypted buffer. |
| * @param[out] out_size The size of the encrypted output. |
| * @param[in] label The label used in the encryption scheme. |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval TSS2_ESYS_RC_BAD_VALUE The algorithm of key is not implemented. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE The internal crypto engine failed. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_pk_encrypt(TPM2B_PUBLIC * key, |
| size_t in_size, |
| BYTE * in_buffer, |
| size_t max_out_size, |
| BYTE * out_buffer, |
| size_t * out_size, const char *label) |
| { |
| TSS2_RC r; |
| gcry_error_t err; |
| char *hash_alg; |
| size_t lsize = 0; |
| BYTE exponent[4] = { 0x00, 0x01, 0x00, 0x01 }; |
| char *padding; |
| gcry_sexp_t sexp_data, sexp_key, sexp_cipher, sexp_cipher_a; |
| if (label != NULL) |
| lsize = strlen(label) + 1; |
| switch (key->publicArea.nameAlg) { |
| case TPM2_ALG_SHA1: |
| hash_alg = "sha1"; |
| break; |
| case TPM2_ALG_SHA256: |
| hash_alg = "sha256"; |
| break; |
| default: |
| LOG_ERROR("Hash alg not implemented"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| switch (key->publicArea.parameters.rsaDetail.scheme.scheme) { |
| case TPM2_ALG_NULL: |
| padding = "raw"; |
| break; |
| case TPM2_ALG_RSAES: |
| padding = "pkcs1"; |
| break; |
| case TPM2_ALG_OAEP: |
| padding = "oaep"; |
| break; |
| default: |
| LOG_ERROR("Illegal RSA scheme"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| size_t offset = 0; |
| r = Tss2_MU_UINT32_Marshal(key->publicArea.parameters.rsaDetail.exponent, |
| &exponent[0], sizeof(UINT32), &offset); |
| if (r != TSS2_RC_SUCCESS) { |
| LOG_ERROR("Marsahling"); |
| return r; |
| } |
| err = gcry_sexp_build(&sexp_data, NULL, |
| "(data (flags %s) (hash-algo %s) (label %b) (value %b) )", |
| padding, hash_alg, lsize, label, (int)in_size, |
| in_buffer); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_sexp_build"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| err = gcry_sexp_build(&sexp_key, NULL, "(public-key (rsa (n %b) (e %b)))", |
| (int)key->publicArea.unique.rsa.size, |
| &key->publicArea.unique.rsa.buffer[0], 4, exponent); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_sexp_build"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| err = gcry_pk_encrypt(&sexp_cipher, sexp_data, sexp_key); |
| if (err != GPG_ERR_NO_ERROR) { |
| fprintf (stderr, "Failure: %s/%s\n", |
| gcry_strsource (err), |
| gcry_strerror (err)); |
| LOG_ERROR("Function gcry_pk_encrypt"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| sexp_cipher_a = gcry_sexp_find_token(sexp_cipher, "a", 0); |
| gcry_mpi_t mpi_cipher = |
| gcry_sexp_nth_mpi(sexp_cipher_a, 1, GCRYMPI_FMT_USG); |
| err = gcry_mpi_print(GCRYMPI_FMT_USG, &out_buffer[0], max_out_size, |
| out_size, mpi_cipher); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_mpi_print"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| free(sexp_data); |
| free(sexp_key); |
| free(sexp_cipher); |
| free(sexp_cipher_a); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Computation of ephemeral ECC key and shared secret Z. |
| * |
| * According to the description in TPM spec part 1 C 6.1 a shared secret |
| * between application and TPM is computed (ECDH). An ephemeral ECC key and a |
| * TPM keyare used for the ECDH key exchange. |
| * @param[in] key The key to be used for ECDH key exchange. |
| * @param[in] max_out_size the max size for the output of the public key of the |
| * computed ephemeral key. |
| * @param[out] Z The computed shared secret. |
| * @param[out] Q The public part of the ephemeral key in TPM format. |
| * @param[out] out_buffer The public part of the ephemeral key will be marshaled |
| * to this buffer. |
| * @param[out] out_size The size of the marshaled output. |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval TSS2_ESYS_RC_BAD_VALUE The algorithm of key is not implemented. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE The internal crypto engine failed. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_get_ecdh_point(TPM2B_PUBLIC *key, |
| size_t max_out_size, |
| TPM2B_ECC_PARAMETER *Z, |
| TPMS_ECC_POINT *Q, |
| BYTE * out_buffer, |
| size_t * out_size) |
| { |
| /* |
| * Format strings for some gcrypt sexps have to be created with sprintf due to |
| * a bug in libgcrypt. %s does not work in libgcypt with these sexps. |
| */ |
| #define SEXP_GENKEY_ECC "(genkey (ecc (curve %s)))" |
| #define SEXP_ECC_POINT "(ecc (curve %s) (q.x %sb) (q.y %sb))" |
| |
| TSS2_RC r; |
| char *curveId; |
| gcry_sexp_t mpi_tpm_sq = NULL; /* sexp for public part of TPM key*/ |
| gcry_sexp_t mpi_sd = NULL; /* sexp for private part of ephemeral key */ |
| gcry_sexp_t mpi_s_pub_q = NULL; /* sexp for public part of ephemeral key */ |
| gcry_mpi_point_t mpi_q = NULL; /* public point of ephemeral key */ |
| gcry_mpi_point_t mpi_tpm_q = NULL; /* public point of TPM key */ |
| gcry_mpi_t mpi_d = NULL; /* private part of ephemeral key */ |
| gcry_mpi_point_t mpi_qd = NULL; /* result of mpi_tpm_q * mpi_d */ |
| gcry_ctx_t ctx = NULL; /* context for ec curves */ |
| size_t size_x, size_y; |
| size_t offset = 0; |
| gcry_mpi_t mpi_x = gcry_mpi_new(521); /* big number for x coordinate */ |
| gcry_mpi_t mpi_y = gcry_mpi_new(521); /* big number for y coordinate */ |
| |
| /* Set libcrypt constant fo curve type */ |
| switch (key->publicArea.parameters.eccDetail.curveID) { |
| case TPM2_ECC_NIST_P192: |
| curveId = "\"NIST P-192\""; |
| break; |
| case TPM2_ECC_NIST_P224: |
| curveId = "\"NIST P-224\""; |
| break; |
| case TPM2_ECC_NIST_P256: |
| curveId = "\"NIST P-256\""; |
| break; |
| case TPM2_ECC_NIST_P384: |
| curveId = "\"NIST P-384\""; |
| break; |
| case TPM2_ECC_NIST_P521: |
| curveId = "\"NIST P-521\""; |
| break; |
| default: |
| LOG_ERROR("Illegal ECC curve ID"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| |
| /* compute ephemeral ecc key */ |
| gcry_sexp_t ekey_spec = NULL, ekey_pair = NULL; |
| { /* scope for sexp_ecc_key */ |
| char sexp_ecc_key [sizeof(SEXP_GENKEY_ECC)+strlen(curveId) |
| -1]; /* -1 = (-2 for %s +1 for \0) */ |
| |
| if (sprintf(&sexp_ecc_key[0], SEXP_GENKEY_ECC, curveId) < 1) { |
| goto_error(r, TSS2_ESYS_RC_MEMORY, "asprintf", cleanup); |
| } |
| |
| if (gcry_sexp_build(&ekey_spec, NULL, |
| sexp_ecc_key) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "gcry_sexp_build", cleanup); |
| } |
| } |
| |
| if (gcry_pk_genkey (&ekey_pair, ekey_spec) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Create ephemeral ecc key", |
| cleanup); |
| } |
| |
| /* Get private ephemeral key d */ |
| mpi_sd = gcry_sexp_find_token(ekey_pair, "d", 0); |
| if (mpi_sd == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Get private part of ecc key", cleanup); |
| } |
| mpi_d = gcry_sexp_nth_mpi(mpi_sd, 1, GCRYMPI_FMT_USG); |
| if (mpi_d == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Get private part of ecc key from sexp", cleanup); |
| } |
| |
| /* Construct ephemeral public key */ |
| mpi_s_pub_q = gcry_sexp_find_token(ekey_pair, "public-key", 0); |
| if (mpi_s_pub_q == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get public part ecc key", |
| cleanup); |
| } |
| |
| if (gcry_mpi_ec_new (&ctx, mpi_s_pub_q, curveId) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Create ec", cleanup); |
| } |
| mpi_q = gcry_mpi_ec_get_point ("q", ctx, 1); |
| if (mpi_q == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get ecc point", cleanup); |
| } |
| |
| /* Check whether point is on curve */ |
| if (!gcry_mpi_ec_curve_point(mpi_q, ctx)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Point not on curve", cleanup); |
| } |
| |
| /* Store ephemeral public key in Q */ |
| if (gcry_mpi_ec_get_affine (mpi_x, mpi_y, mpi_q, ctx)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Point is at infinity", |
| cleanup); |
| } |
| |
| if (gcry_mpi_print(GCRYMPI_FMT_USG, &Q->x.buffer[0], max_out_size, |
| &size_x, mpi_x) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get x part of point", |
| cleanup); |
| } |
| |
| if (gcry_mpi_print(GCRYMPI_FMT_USG, &Q->y.buffer[0], max_out_size, |
| &size_y, mpi_y) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get y part of point", |
| cleanup); |
| } |
| Q->x.size = size_x; |
| Q->y.size = size_y; |
| SAFE_FREE(ctx); |
| { /* scope for sexp_point */ |
| |
| /* Get public point from TPM key */ |
| char sexp_point [sizeof(SEXP_ECC_POINT) + strlen(curveId) |
| + key->publicArea.unique.ecc.x.size |
| + key->publicArea.unique.ecc.y.size |
| - 5]; /* -1 = (-4 for 2*%sb -2 for %s +1 for \0) */ |
| |
| if (sprintf(&sexp_point[0], SEXP_ECC_POINT, |
| curveId, "%", "%") <1 ) { |
| goto_error(r, TSS2_ESYS_RC_MEMORY, "asprintf", cleanup); |
| } |
| |
| if ( gcry_sexp_build(&mpi_tpm_sq, NULL, |
| sexp_point, |
| key->publicArea.unique.ecc.x.size, |
| &key->publicArea.unique.ecc.x.buffer[0], |
| key->publicArea.unique.ecc.y.size, |
| &key->publicArea.unique.ecc.y.buffer[0])) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Function gcry_mpi_scan", cleanup); |
| |
| } |
| } |
| offset = 0; |
| r = Tss2_MU_TPMS_ECC_POINT_Marshal(Q, &out_buffer[0], max_out_size, &offset); |
| return_if_error(r, "Error marshaling"); |
| *out_size = offset; |
| |
| /* Multiply d and Q */ |
| if (gcry_mpi_ec_new (&ctx, mpi_tpm_sq, curveId)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "create ec curve", cleanup); |
| } |
| mpi_tpm_q = gcry_mpi_ec_get_point ("q", ctx, 1); |
| mpi_qd = gcry_mpi_point_new(256); |
| gcry_mpi_ec_mul(mpi_qd , mpi_d, mpi_tpm_q, ctx); |
| |
| /* Store the x coordinate of d*Q in Z which will be used for KDFe */ |
| if (gcry_mpi_ec_get_affine (mpi_x, mpi_y, mpi_qd, ctx)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Point is at infinity", cleanup); |
| } |
| |
| if (gcry_mpi_print(GCRYMPI_FMT_USG, &Z->buffer[0], TPM2_MAX_ECC_KEY_BYTES, |
| &size_x, mpi_x)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Get x coordinate d*Q", cleanup); |
| } |
| |
| Z->size = size_x; |
| LOGBLOB_DEBUG(&Z->buffer[0], size_x, "Z (Q*d)"); |
| |
| cleanup: |
| SAFE_FREE(ctx); |
| SAFE_FREE(mpi_x); |
| SAFE_FREE(mpi_y); |
| SAFE_FREE(mpi_tpm_q); |
| SAFE_FREE(mpi_qd); |
| SAFE_FREE(mpi_q); |
| SAFE_FREE(mpi_tpm_q); |
| SAFE_FREE(mpi_tpm_sq); |
| SAFE_FREE(ekey_spec); |
| SAFE_FREE(mpi_s_pub_q); |
| |
| return r; |
| } |
| |
| /** Initialize AES context for encryption / decryption. |
| * |
| * @param[out] handle for AES context |
| * @param[in] key key used for AES. |
| * @param[in] tpm_sym_alg AES type in TSS2 notation. |
| * @param[in] key_bits Key size in bits. |
| * @param[in] tpm_mode Block cipher mode of opertion in TSS2 notation (CBC or CFB). |
| * @param[in] iv_len Length of initialization vector (iv) in byte. |
| * @param[in] iv The initialization vector. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE for invalid |
| * parameters, TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto |
| * library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_sym_aes_init(gcry_cipher_hd_t * cipher_hd, |
| uint8_t * key, |
| TPM2_ALG_ID tpm_sym_alg, |
| TPMI_AES_KEY_BITS key_bits, |
| TPM2_ALG_ID tpm_mode, |
| size_t iv_len, uint8_t * iv) |
| { |
| |
| LOGBLOB_TRACE(key, (key_bits + 7) / 8, "IESYS AES key"); |
| LOGBLOB_TRACE(iv, iv_len, "IESYS AES iv"); |
| int algo, mode, len; |
| size_t key_len = 0; |
| gcry_error_t err; |
| switch (tpm_sym_alg) { |
| case TPM2_ALG_AES: |
| switch (key_bits) { |
| case 128: |
| algo = GCRY_CIPHER_AES128; |
| len = 128; |
| break; |
| case 192: |
| algo = GCRY_CIPHER_AES192; |
| len = 192; |
| break; |
| case 256: |
| algo = GCRY_CIPHER_AES256; |
| len = 256; |
| break; |
| default: |
| LOG_ERROR("Illegal key length."); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| switch (tpm_mode) { |
| case TPM2_ALG_CBC: |
| mode = GCRY_CIPHER_MODE_CBC; |
| break; |
| case TPM2_ALG_CFB: |
| mode = GCRY_CIPHER_MODE_CFB; |
| break; |
| default: |
| LOG_ERROR("Illegal symmetric algorithm."); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| break; |
| default: |
| LOG_ERROR("Illegal symmetric algorithm."); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| key_len = (len + 7) / 8; |
| err = gcry_cipher_open(cipher_hd, algo, mode, 0); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Opening gcrypt context"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| if (iv_len != 0) { |
| err = gcry_cipher_setiv(*cipher_hd, &iv[0], iv_len); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_setiv"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| } |
| err = gcry_cipher_setkey(*cipher_hd, key, key_len); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_setkey"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Encrypt data with AES. |
| * |
| * @param[in] key key used for AES. |
| * @param[in] tpm_sym_alg AES type in TSS2 notation (must be TPM2_ALG_AES). |
| * @param[in] key_bits Key size in bits. |
| * @param[in] tpm_mode Block cipher mode of opertion in TSS2 notation (CBC or CFB). |
| * @param[in] blk_len Length Block length of AES. |
| * @param[in,out] buffer Data to be encrypted. The encrypted date will be stored |
| * in this buffer. |
| * @param[in] buffer_size size of data to be encrypted. |
| * @param[in] iv The initialization vector. The size is equal to blk_len. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE and |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters, |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_sym_aes_encrypt(uint8_t * key, |
| TPM2_ALG_ID tpm_sym_alg, |
| TPMI_AES_KEY_BITS key_bits, |
| TPM2_ALG_ID tpm_mode, |
| size_t blk_len, |
| uint8_t * buffer, |
| size_t buffer_size, |
| uint8_t * iv) |
| { |
| gcry_cipher_hd_t cipher_hd; |
| gcry_error_t err; |
| TSS2_RC r; |
| |
| if (key == NULL || buffer == NULL) { |
| LOG_ERROR("Bad reference"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| r = iesys_cryptogcry_sym_aes_init(&cipher_hd, key, tpm_sym_alg, |
| key_bits, tpm_mode, blk_len, iv); |
| if (r != TSS2_RC_SUCCESS) |
| return r; |
| LOGBLOB_TRACE(buffer, buffer_size, "IESYS AES input"); |
| err = gcry_cipher_encrypt(cipher_hd, buffer, buffer_size, NULL, 0); |
| LOGBLOB_TRACE(buffer, buffer_size, "IESYS AES output"); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_encrypt"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| gcry_cipher_close(cipher_hd); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Decrypt data with AES. |
| * |
| * @param[in] key key used for AES. |
| * @param[in] tpm_sym_alg AES type in TSS2 notation (must be TPM2_ALG_AES). |
| * @param[in] key_bits Key size in bits. |
| * @param[in] tpm_mode Block cipher mode of opertion in TSS2 notation (CBC or CFB). |
| * @param[in] blk_len Length Block length of AES. |
| * @param[in,out] buffer Data to be decrypted. The decrypted date will be stored |
| * in this buffer. |
| * @param[in] buffer_size size of data to be encrypted. |
| * @param[in] iv The initialization vector. The size is equal to blk_len. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE and |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters, |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_sym_aes_decrypt(uint8_t * key, |
| TPM2_ALG_ID tpm_sym_alg, |
| TPMI_AES_KEY_BITS key_bits, |
| TPM2_ALG_ID tpm_mode, |
| size_t blk_len, |
| uint8_t * buffer, |
| size_t buffer_size, |
| uint8_t * iv) |
| { |
| gcry_cipher_hd_t cipher_hd; |
| gcry_error_t err; |
| TSS2_RC r; |
| |
| if (tpm_sym_alg != TPM2_ALG_AES) { |
| LOG_ERROR("AES expected"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| if (key == NULL || buffer == NULL) { |
| LOG_ERROR("Bad reference"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| r = iesys_cryptogcry_sym_aes_init(&cipher_hd, key, tpm_sym_alg, |
| key_bits, tpm_mode, blk_len, iv); |
| if (r != TSS2_RC_SUCCESS) |
| return r; |
| err = gcry_cipher_decrypt(cipher_hd, buffer, buffer_size, NULL, 0); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_decrypt"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| gcry_cipher_close(cipher_hd); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Encryption/Decryption using XOR obfuscation. |
| * |
| * The application of this function to data encrypted with this function will |
| * produce the origin data. The key for XOR obfuscation will be derived with |
| * KDFa form the passed key the session nonces, and the hash algorithm. |
| * @param[in] hash_alg The algorithm used for key derivation. |
| * @param[in] key key used for obfuscation |
| * @param[in] key_size Key size in bits. |
| * @param[in] contextU, contextV are used for construction of a binary string |
| * containing information related to the derived key. |
| * @param[in,out] data Data to be encrypted/decrypted the result will be |
| * will be stored in this buffer. |
| * @param[in] data_size size of data to be encrypted/decrypted. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE and |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_xor_parameter_obfuscation(TPM2_ALG_ID hash_alg, |
| uint8_t *key, |
| size_t key_size, |
| TPM2B_NONCE * contextU, |
| TPM2B_NONCE * contextV, |
| BYTE *data, |
| size_t data_size) |
| { |
| TSS2_RC r; |
| uint32_t counter = 0; |
| BYTE kdfa_result[TPM2_MAX_DIGEST_BUFFER]; |
| size_t digest_size; |
| size_t data_size_bits = data_size * 8; |
| size_t rest_size = data_size; |
| BYTE *kdfa_byte_ptr; |
| |
| if (key == NULL || data == NULL) { |
| LOG_ERROR("Bad reference"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| r = iesys_crypto_hash_get_digest_size(hash_alg, &digest_size); |
| return_if_error(r, "Hash alg not supported"); |
| while(rest_size > 0) { |
| r = iesys_crypto_KDFa(hash_alg, key, key_size, "XOR", |
| contextU, contextV, data_size_bits, &counter, |
| kdfa_result, TRUE); |
| return_if_error(r, "iesys_crypto_KDFa failed"); |
| /* XOR next data sub block with KDFa result */ |
| kdfa_byte_ptr = kdfa_result; |
| LOGBLOB_TRACE(data, data_size, "Parameter data before XOR"); |
| for(size_t i = digest_size < rest_size ? digest_size : rest_size; i > 0; |
| i--) |
| *data++ ^= *kdfa_byte_ptr++; |
| LOGBLOB_TRACE(data, data_size, "Parameter data after XOR"); |
| rest_size = rest_size < digest_size ? 0 : rest_size - digest_size; |
| } |
| return TSS2_RC_SUCCESS; |
| } |