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6c2bb98bc3
Up until now algorithms have been happy to get a context pointer since they know everything that's in the tfm already (e.g., alignment, block size). However, once we have parameterised algorithms, such information will be specific to each tfm. So the algorithm API needs to be changed to pass the tfm structure instead of the context pointer. This patch is basically a text substitution. The only tricky bit is the assembly routines that need to get the context pointer offset through asm-offsets.h. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
/*
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* Cryptographic API.
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*
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* SHA1 Secure Hash Algorithm.
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*
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* Derived from cryptoapi implementation, adapted for in-place
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* scatterlist interface.
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*
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* Copyright (c) Alan Smithee.
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
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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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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/crypto.h>
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#include <linux/cryptohash.h>
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#include <linux/types.h>
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#include <asm/scatterlist.h>
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#include <asm/byteorder.h>
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#define SHA1_DIGEST_SIZE 20
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#define SHA1_HMAC_BLOCK_SIZE 64
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struct sha1_ctx {
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u64 count;
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u32 state[5];
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u8 buffer[64];
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};
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static void sha1_init(struct crypto_tfm *tfm)
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{
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struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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static const struct sha1_ctx initstate = {
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0,
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{ 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 },
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{ 0, }
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};
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*sctx = initstate;
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}
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static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
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unsigned int len)
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{
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struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned int partial, done;
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const u8 *src;
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partial = sctx->count & 0x3f;
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sctx->count += len;
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done = 0;
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src = data;
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if ((partial + len) > 63) {
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u32 temp[SHA_WORKSPACE_WORDS];
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if (partial) {
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done = -partial;
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memcpy(sctx->buffer + partial, data, done + 64);
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src = sctx->buffer;
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}
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do {
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sha_transform(sctx->state, src, temp);
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done += 64;
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src = data + done;
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} while (done + 63 < len);
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memset(temp, 0, sizeof(temp));
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partial = 0;
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}
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memcpy(sctx->buffer + partial, src, len - done);
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}
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/* Add padding and return the message digest. */
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static void sha1_final(struct crypto_tfm *tfm, u8 *out)
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{
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struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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__be32 *dst = (__be32 *)out;
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u32 i, index, padlen;
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__be64 bits;
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static const u8 padding[64] = { 0x80, };
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64 */
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index = sctx->count & 0x3f;
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padlen = (index < 56) ? (56 - index) : ((64+56) - index);
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sha1_update(tfm, padding, padlen);
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/* Append length */
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sha1_update(tfm, (const u8 *)&bits, sizeof(bits));
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/* Store state in digest */
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for (i = 0; i < 5; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Wipe context */
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memset(sctx, 0, sizeof *sctx);
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}
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static struct crypto_alg alg = {
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.cra_name = "sha1",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct sha1_ctx),
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.cra_module = THIS_MODULE,
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.cra_alignmask = 3,
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.cra_list = LIST_HEAD_INIT(alg.cra_list),
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.cra_u = { .digest = {
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.dia_digestsize = SHA1_DIGEST_SIZE,
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.dia_init = sha1_init,
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.dia_update = sha1_update,
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.dia_final = sha1_final } }
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};
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static int __init init(void)
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{
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return crypto_register_alg(&alg);
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}
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static void __exit fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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