| /* |
| * Scatterlist Cryptographic API. |
| * |
| * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
| * Copyright (c) 2002 David S. Miller (davem@redhat.com) |
| * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
| * |
| * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no> |
| * and Nettle, by Niels Möller. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| */ |
| #ifndef _LINUX_CRYPTO_H |
| #define _LINUX_CRYPTO_H |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/list.h> |
| #include <linux/string.h> |
| #include <asm/page.h> |
| |
| /* |
| * Algorithm masks and types. |
| */ |
| #define CRYPTO_ALG_TYPE_MASK 0x000000ff |
| #define CRYPTO_ALG_TYPE_CIPHER 0x00000001 |
| #define CRYPTO_ALG_TYPE_DIGEST 0x00000002 |
| #define CRYPTO_ALG_TYPE_COMPRESS 0x00000004 |
| |
| /* |
| * Transform masks and values (for crt_flags). |
| */ |
| #define CRYPTO_TFM_MODE_MASK 0x000000ff |
| #define CRYPTO_TFM_REQ_MASK 0x000fff00 |
| #define CRYPTO_TFM_RES_MASK 0xfff00000 |
| |
| #define CRYPTO_TFM_MODE_ECB 0x00000001 |
| #define CRYPTO_TFM_MODE_CBC 0x00000002 |
| #define CRYPTO_TFM_MODE_CFB 0x00000004 |
| #define CRYPTO_TFM_MODE_CTR 0x00000008 |
| |
| #define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100 |
| #define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200 |
| #define CRYPTO_TFM_RES_WEAK_KEY 0x00100000 |
| #define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000 |
| #define CRYPTO_TFM_RES_BAD_KEY_SCHED 0x00400000 |
| #define CRYPTO_TFM_RES_BAD_BLOCK_LEN 0x00800000 |
| #define CRYPTO_TFM_RES_BAD_FLAGS 0x01000000 |
| |
| /* |
| * Miscellaneous stuff. |
| */ |
| #define CRYPTO_UNSPEC 0 |
| #define CRYPTO_MAX_ALG_NAME 64 |
| |
| #define CRYPTO_DIR_ENCRYPT 1 |
| #define CRYPTO_DIR_DECRYPT 0 |
| |
| struct scatterlist; |
| struct crypto_tfm; |
| |
| struct cipher_desc { |
| struct crypto_tfm *tfm; |
| void (*crfn)(void *ctx, u8 *dst, const u8 *src); |
| unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst, |
| const u8 *src, unsigned int nbytes); |
| void *info; |
| }; |
| |
| /* |
| * Algorithms: modular crypto algorithm implementations, managed |
| * via crypto_register_alg() and crypto_unregister_alg(). |
| */ |
| struct cipher_alg { |
| unsigned int cia_min_keysize; |
| unsigned int cia_max_keysize; |
| int (*cia_setkey)(void *ctx, const u8 *key, |
| unsigned int keylen, u32 *flags); |
| void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src); |
| void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src); |
| |
| unsigned int (*cia_encrypt_ecb)(const struct cipher_desc *desc, |
| u8 *dst, const u8 *src, |
| unsigned int nbytes); |
| unsigned int (*cia_decrypt_ecb)(const struct cipher_desc *desc, |
| u8 *dst, const u8 *src, |
| unsigned int nbytes); |
| unsigned int (*cia_encrypt_cbc)(const struct cipher_desc *desc, |
| u8 *dst, const u8 *src, |
| unsigned int nbytes); |
| unsigned int (*cia_decrypt_cbc)(const struct cipher_desc *desc, |
| u8 *dst, const u8 *src, |
| unsigned int nbytes); |
| }; |
| |
| struct digest_alg { |
| unsigned int dia_digestsize; |
| void (*dia_init)(void *ctx); |
| void (*dia_update)(void *ctx, const u8 *data, unsigned int len); |
| void (*dia_final)(void *ctx, u8 *out); |
| int (*dia_setkey)(void *ctx, const u8 *key, |
| unsigned int keylen, u32 *flags); |
| }; |
| |
| struct compress_alg { |
| int (*coa_init)(void *ctx); |
| void (*coa_exit)(void *ctx); |
| int (*coa_compress)(void *ctx, const u8 *src, unsigned int slen, |
| u8 *dst, unsigned int *dlen); |
| int (*coa_decompress)(void *ctx, const u8 *src, unsigned int slen, |
| u8 *dst, unsigned int *dlen); |
| }; |
| |
| #define cra_cipher cra_u.cipher |
| #define cra_digest cra_u.digest |
| #define cra_compress cra_u.compress |
| |
| struct crypto_alg { |
| struct list_head cra_list; |
| u32 cra_flags; |
| unsigned int cra_blocksize; |
| unsigned int cra_ctxsize; |
| unsigned int cra_alignmask; |
| |
| int cra_priority; |
| |
| const char cra_name[CRYPTO_MAX_ALG_NAME]; |
| const char cra_driver_name[CRYPTO_MAX_ALG_NAME]; |
| |
| union { |
| struct cipher_alg cipher; |
| struct digest_alg digest; |
| struct compress_alg compress; |
| } cra_u; |
| |
| struct module *cra_module; |
| }; |
| |
| /* |
| * Algorithm registration interface. |
| */ |
| int crypto_register_alg(struct crypto_alg *alg); |
| int crypto_unregister_alg(struct crypto_alg *alg); |
| |
| /* |
| * Algorithm query interface. |
| */ |
| #ifdef CONFIG_CRYPTO |
| int crypto_alg_available(const char *name, u32 flags); |
| #else |
| static inline int crypto_alg_available(const char *name, u32 flags) |
| { |
| return 0; |
| } |
| #endif |
| |
| /* |
| * Transforms: user-instantiated objects which encapsulate algorithms |
| * and core processing logic. Managed via crypto_alloc_tfm() and |
| * crypto_free_tfm(), as well as the various helpers below. |
| */ |
| |
| struct cipher_tfm { |
| void *cit_iv; |
| unsigned int cit_ivsize; |
| u32 cit_mode; |
| int (*cit_setkey)(struct crypto_tfm *tfm, |
| const u8 *key, unsigned int keylen); |
| int (*cit_encrypt)(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes); |
| int (*cit_encrypt_iv)(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes, u8 *iv); |
| int (*cit_decrypt)(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes); |
| int (*cit_decrypt_iv)(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes, u8 *iv); |
| void (*cit_xor_block)(u8 *dst, const u8 *src); |
| }; |
| |
| struct digest_tfm { |
| void (*dit_init)(struct crypto_tfm *tfm); |
| void (*dit_update)(struct crypto_tfm *tfm, |
| struct scatterlist *sg, unsigned int nsg); |
| void (*dit_final)(struct crypto_tfm *tfm, u8 *out); |
| void (*dit_digest)(struct crypto_tfm *tfm, struct scatterlist *sg, |
| unsigned int nsg, u8 *out); |
| int (*dit_setkey)(struct crypto_tfm *tfm, |
| const u8 *key, unsigned int keylen); |
| #ifdef CONFIG_CRYPTO_HMAC |
| void *dit_hmac_block; |
| #endif |
| }; |
| |
| struct compress_tfm { |
| int (*cot_compress)(struct crypto_tfm *tfm, |
| const u8 *src, unsigned int slen, |
| u8 *dst, unsigned int *dlen); |
| int (*cot_decompress)(struct crypto_tfm *tfm, |
| const u8 *src, unsigned int slen, |
| u8 *dst, unsigned int *dlen); |
| }; |
| |
| #define crt_cipher crt_u.cipher |
| #define crt_digest crt_u.digest |
| #define crt_compress crt_u.compress |
| |
| struct crypto_tfm { |
| |
| u32 crt_flags; |
| |
| union { |
| struct cipher_tfm cipher; |
| struct digest_tfm digest; |
| struct compress_tfm compress; |
| } crt_u; |
| |
| struct crypto_alg *__crt_alg; |
| |
| char __crt_ctx[] __attribute__ ((__aligned__)); |
| }; |
| |
| /* |
| * Transform user interface. |
| */ |
| |
| /* |
| * crypto_alloc_tfm() will first attempt to locate an already loaded algorithm. |
| * If that fails and the kernel supports dynamically loadable modules, it |
| * will then attempt to load a module of the same name or alias. A refcount |
| * is grabbed on the algorithm which is then associated with the new transform. |
| * |
| * crypto_free_tfm() frees up the transform and any associated resources, |
| * then drops the refcount on the associated algorithm. |
| */ |
| struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags); |
| void crypto_free_tfm(struct crypto_tfm *tfm); |
| |
| /* |
| * Transform helpers which query the underlying algorithm. |
| */ |
| static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm) |
| { |
| return tfm->__crt_alg->cra_name; |
| } |
| |
| static inline const char *crypto_tfm_alg_modname(struct crypto_tfm *tfm) |
| { |
| return module_name(tfm->__crt_alg->cra_module); |
| } |
| |
| static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm) |
| { |
| return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK; |
| } |
| |
| static inline unsigned int crypto_tfm_alg_min_keysize(struct crypto_tfm *tfm) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| return tfm->__crt_alg->cra_cipher.cia_min_keysize; |
| } |
| |
| static inline unsigned int crypto_tfm_alg_max_keysize(struct crypto_tfm *tfm) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| return tfm->__crt_alg->cra_cipher.cia_max_keysize; |
| } |
| |
| static inline unsigned int crypto_tfm_alg_ivsize(struct crypto_tfm *tfm) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| return tfm->crt_cipher.cit_ivsize; |
| } |
| |
| static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm) |
| { |
| return tfm->__crt_alg->cra_blocksize; |
| } |
| |
| static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST); |
| return tfm->__crt_alg->cra_digest.dia_digestsize; |
| } |
| |
| static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm) |
| { |
| return tfm->__crt_alg->cra_alignmask; |
| } |
| |
| static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm) |
| { |
| return tfm->__crt_ctx; |
| } |
| |
| static inline unsigned int crypto_tfm_ctx_alignment(void) |
| { |
| struct crypto_tfm *tfm; |
| return __alignof__(tfm->__crt_ctx); |
| } |
| |
| /* |
| * API wrappers. |
| */ |
| static inline void crypto_digest_init(struct crypto_tfm *tfm) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST); |
| tfm->crt_digest.dit_init(tfm); |
| } |
| |
| static inline void crypto_digest_update(struct crypto_tfm *tfm, |
| struct scatterlist *sg, |
| unsigned int nsg) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST); |
| tfm->crt_digest.dit_update(tfm, sg, nsg); |
| } |
| |
| static inline void crypto_digest_final(struct crypto_tfm *tfm, u8 *out) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST); |
| tfm->crt_digest.dit_final(tfm, out); |
| } |
| |
| static inline void crypto_digest_digest(struct crypto_tfm *tfm, |
| struct scatterlist *sg, |
| unsigned int nsg, u8 *out) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST); |
| tfm->crt_digest.dit_digest(tfm, sg, nsg, out); |
| } |
| |
| static inline int crypto_digest_setkey(struct crypto_tfm *tfm, |
| const u8 *key, unsigned int keylen) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST); |
| if (tfm->crt_digest.dit_setkey == NULL) |
| return -ENOSYS; |
| return tfm->crt_digest.dit_setkey(tfm, key, keylen); |
| } |
| |
| static inline int crypto_cipher_setkey(struct crypto_tfm *tfm, |
| const u8 *key, unsigned int keylen) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| return tfm->crt_cipher.cit_setkey(tfm, key, keylen); |
| } |
| |
| static inline int crypto_cipher_encrypt(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| return tfm->crt_cipher.cit_encrypt(tfm, dst, src, nbytes); |
| } |
| |
| static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes, u8 *iv) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB); |
| return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv); |
| } |
| |
| static inline int crypto_cipher_decrypt(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| return tfm->crt_cipher.cit_decrypt(tfm, dst, src, nbytes); |
| } |
| |
| static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm, |
| struct scatterlist *dst, |
| struct scatterlist *src, |
| unsigned int nbytes, u8 *iv) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB); |
| return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv); |
| } |
| |
| static inline void crypto_cipher_set_iv(struct crypto_tfm *tfm, |
| const u8 *src, unsigned int len) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| memcpy(tfm->crt_cipher.cit_iv, src, len); |
| } |
| |
| static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm, |
| u8 *dst, unsigned int len) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER); |
| memcpy(dst, tfm->crt_cipher.cit_iv, len); |
| } |
| |
| static inline int crypto_comp_compress(struct crypto_tfm *tfm, |
| const u8 *src, unsigned int slen, |
| u8 *dst, unsigned int *dlen) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS); |
| return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen); |
| } |
| |
| static inline int crypto_comp_decompress(struct crypto_tfm *tfm, |
| const u8 *src, unsigned int slen, |
| u8 *dst, unsigned int *dlen) |
| { |
| BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS); |
| return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen); |
| } |
| |
| /* |
| * HMAC support. |
| */ |
| #ifdef CONFIG_CRYPTO_HMAC |
| void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen); |
| void crypto_hmac_update(struct crypto_tfm *tfm, |
| struct scatterlist *sg, unsigned int nsg); |
| void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key, |
| unsigned int *keylen, u8 *out); |
| void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen, |
| struct scatterlist *sg, unsigned int nsg, u8 *out); |
| #endif /* CONFIG_CRYPTO_HMAC */ |
| |
| #endif /* _LINUX_CRYPTO_H */ |
| |