103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
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/*
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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 <crypto/internal/hash.h>
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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/cryptohash.h>
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#include <linux/types.h>
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#include <crypto/sha.h>
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#include <crypto/sha1_base.h>
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#include <asm/byteorder.h>
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const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
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0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
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0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
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0xaf, 0xd8, 0x07, 0x09
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};
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EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
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static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
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int blocks)
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{
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u32 temp[SHA_WORKSPACE_WORDS];
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while (blocks--) {
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sha_transform(sst->state, src, temp);
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src += SHA1_BLOCK_SIZE;
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}
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memzero_explicit(temp, sizeof(temp));
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}
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int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
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}
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EXPORT_SYMBOL(crypto_sha1_update);
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static int sha1_final(struct shash_desc *desc, u8 *out)
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{
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sha1_base_do_finalize(desc, sha1_generic_block_fn);
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return sha1_base_finish(desc, out);
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}
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int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
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return sha1_final(desc, out);
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}
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EXPORT_SYMBOL(crypto_sha1_finup);
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static struct shash_alg alg = {
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.digestsize = SHA1_DIGEST_SIZE,
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.init = sha1_base_init,
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.update = crypto_sha1_update,
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.final = sha1_final,
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.finup = crypto_sha1_finup,
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.descsize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name= "sha1-generic",
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.cra_priority = 100,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha1_generic_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit sha1_generic_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(sha1_generic_mod_init);
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module_exit(sha1_generic_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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MODULE_ALIAS_CRYPTO("sha1");
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MODULE_ALIAS_CRYPTO("sha1-generic");
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