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Diffstat (limited to 'include/linux/crypto.h')
| -rw-r--r-- | include/linux/crypto.h | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/include/linux/crypto.h b/include/linux/crypto.h new file mode 100644 index 000000000000..387da6a3e58c --- /dev/null +++ b/include/linux/crypto.h @@ -0,0 +1,398 @@ +/* + * Scatterlist Cryptographic API. + * + * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> + * Copyright (c) 2002 David S. Miller (davem@redhat.com) + * + * 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_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; + +/* + * 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); +}; + +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; + const char cra_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 crypto_tfm; + +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; +}; + +/* + * 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; +} + +/* + * 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 */ + |