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