4 * SHA1 Secure Hash Algorithm.
6 * Derived from cryptoapi implementation, adapted for in-place
7 * scatterlist interface.
9 * Copyright (c) Alan Smithee.
10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
11 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
19 #include <crypto/internal/hash.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
23 #include <linux/cryptohash.h>
24 #include <linux/types.h>
25 #include <crypto/sha.h>
26 #include <asm/byteorder.h>
34 static int sha1_init(struct shash_desc *desc)
36 struct sha1_ctx *sctx = shash_desc_ctx(desc);
38 static const struct sha1_ctx initstate = {
40 { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
49 static int sha1_update(struct shash_desc *desc, const u8 *data,
52 struct sha1_ctx *sctx = shash_desc_ctx(desc);
53 unsigned int partial, done;
56 partial = sctx->count & 0x3f;
61 if ((partial + len) > 63) {
62 u32 temp[SHA_WORKSPACE_WORDS];
66 memcpy(sctx->buffer + partial, data, done + 64);
71 sha_transform(sctx->state, src, temp);
74 } while (done + 63 < len);
76 memset(temp, 0, sizeof(temp));
79 memcpy(sctx->buffer + partial, src, len - done);
85 /* Add padding and return the message digest. */
86 static int sha1_final(struct shash_desc *desc, u8 *out)
88 struct sha1_ctx *sctx = shash_desc_ctx(desc);
89 __be32 *dst = (__be32 *)out;
92 static const u8 padding[64] = { 0x80, };
94 bits = cpu_to_be64(sctx->count << 3);
96 /* Pad out to 56 mod 64 */
97 index = sctx->count & 0x3f;
98 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
99 sha1_update(desc, padding, padlen);
102 sha1_update(desc, (const u8 *)&bits, sizeof(bits));
104 /* Store state in digest */
105 for (i = 0; i < 5; i++)
106 dst[i] = cpu_to_be32(sctx->state[i]);
109 memset(sctx, 0, sizeof *sctx);
114 static struct shash_alg alg = {
115 .digestsize = SHA1_DIGEST_SIZE,
117 .update = sha1_update,
119 .descsize = sizeof(struct sha1_ctx),
122 .cra_driver_name= "sha1-generic",
123 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
124 .cra_blocksize = SHA1_BLOCK_SIZE,
125 .cra_module = THIS_MODULE,
129 static int __init sha1_generic_mod_init(void)
131 return crypto_register_shash(&alg);
134 static void __exit sha1_generic_mod_fini(void)
136 crypto_unregister_shash(&alg);
139 module_init(sha1_generic_mod_init);
140 module_exit(sha1_generic_mod_fini);
142 MODULE_LICENSE("GPL");
143 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
145 MODULE_ALIAS("sha1");