| /* |
| * sha1.h |
| * |
| * interface to the Secure Hash Algorithm v.1 (SHA-1), specified in |
| * FIPS 180-1 |
| * |
| * David A. McGrew |
| * Cisco Systems, Inc. |
| */ |
| |
| /* |
| * |
| * Copyright (c) 2001-2006, Cisco Systems, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 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. |
| * |
| * Neither the name of the Cisco Systems, Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * 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 HOLDERS 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. |
| * |
| */ |
| |
| #ifndef SHA1_H |
| #define SHA1_H |
| |
| #include "err.h" |
| #ifdef OPENSSL |
| #include <openssl/evp.h> |
| #include <stdint.h> |
| |
| typedef EVP_MD_CTX srtp_sha1_ctx_t; |
| |
| /* |
| * srtp_sha1_init(&ctx) initializes the SHA1 context ctx |
| * |
| * srtp_sha1_update(&ctx, msg, len) hashes the len octets starting at msg |
| * into the SHA1 context |
| * |
| * srtp_sha1_final(&ctx, output) performs the final processing of the SHA1 |
| * context and writes the result to the 20 octets at output |
| * |
| * Return values are ignored on the EVP functions since all three |
| * of these functions return void. |
| * |
| */ |
| |
| inline void srtp_sha1_init (srtp_sha1_ctx_t *ctx) |
| { |
| EVP_MD_CTX_init(ctx); |
| EVP_DigestInit(ctx, EVP_sha1()); |
| } |
| |
| inline void srtp_sha1_update (srtp_sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg) |
| { |
| EVP_DigestUpdate(ctx, M, octets_in_msg); |
| } |
| |
| inline void srtp_sha1_final (srtp_sha1_ctx_t *ctx, uint32_t *output) |
| { |
| unsigned int len = 0; |
| |
| EVP_DigestFinal(ctx, (unsigned char*)output, &len); |
| } |
| #else |
| #include "datatypes.h" |
| |
| typedef struct { |
| uint32_t H[5]; /* state vector */ |
| uint32_t M[16]; /* message buffer */ |
| int octets_in_buffer; /* octets of message in buffer */ |
| uint32_t num_bits_in_msg; /* total number of bits in message */ |
| } srtp_sha1_ctx_t; |
| |
| /* |
| * sha1(&ctx, msg, len, output) hashes the len octets starting at msg |
| * into the SHA1 context, then writes the result to the 20 octets at |
| * output |
| * |
| */ |
| |
| void |
| sha1(const uint8_t *message, int octets_in_msg, uint32_t output[5]); |
| |
| /* |
| * srtp_sha1_init(&ctx) initializes the SHA1 context ctx |
| * |
| * srtp_sha1_update(&ctx, msg, len) hashes the len octets starting at msg |
| * into the SHA1 context |
| * |
| * srtp_sha1_final(&ctx, output) performs the final processing of the SHA1 |
| * context and writes the result to the 20 octets at output |
| * |
| */ |
| |
| void |
| srtp_sha1_init(srtp_sha1_ctx_t *ctx); |
| |
| void |
| srtp_sha1_update(srtp_sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg); |
| |
| void |
| srtp_sha1_final(srtp_sha1_ctx_t *ctx, uint32_t output[5]); |
| |
| /* |
| * The srtp_sha1_core function is INTERNAL to SHA-1, but it is declared |
| * here because it is also used by the cipher SEAL 3.0 in its key |
| * setup algorithm. |
| */ |
| |
| /* |
| * srtp_sha1_core(M, H) computes the core sha1 compression function, where M is |
| * the next part of the message and H is the intermediate state {H0, |
| * H1, ...} |
| * |
| * this function does not do any of the padding required in the |
| * complete sha1 function |
| */ |
| |
| void |
| srtp_sha1_core(const uint32_t M[16], uint32_t hash_value[5]); |
| |
| #endif /* else OPENSSL */ |
| |
| #endif /* SHA1_H */ |