162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
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* Cryptographic API.
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*
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* s390 implementation of the 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. Originally based on the public domain
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* implementation written by Steve Reid.
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*
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* s390 Version:
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* Copyright IBM Corp. 2003,2007
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* Author(s): Thomas Spatzier
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* Jan Glauber (jan.glauber@de.ibm.com)
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*
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* Derived from "crypto/sha1.c"
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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/crypto.h>
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#include "crypt_s390.h"
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#define SHA1_DIGEST_SIZE 20
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#define SHA1_BLOCK_SIZE 64
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struct s390_sha1_ctx {
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u64 count; /* message length */
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u32 state[5];
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u8 buf[2 * SHA1_BLOCK_SIZE];
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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 s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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sctx->state[0] = 0x67452301;
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sctx->state[1] = 0xEFCDAB89;
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sctx->state[2] = 0x98BADCFE;
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sctx->state[3] = 0x10325476;
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sctx->state[4] = 0xC3D2E1F0;
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sctx->count = 0;
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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 s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned int index;
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int ret;
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/* how much is already in the buffer? */
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index = sctx->count & 0x3f;
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sctx->count += len;
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if (index + len < SHA1_BLOCK_SIZE)
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goto store;
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/* process one stored block */
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if (index) {
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memcpy(sctx->buf + index, data, SHA1_BLOCK_SIZE - index);
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ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf,
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SHA1_BLOCK_SIZE);
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BUG_ON(ret != SHA1_BLOCK_SIZE);
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data += SHA1_BLOCK_SIZE - index;
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len -= SHA1_BLOCK_SIZE - index;
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}
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/* process as many blocks as possible */
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if (len >= SHA1_BLOCK_SIZE) {
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ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, data,
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len & ~(SHA1_BLOCK_SIZE - 1));
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BUG_ON(ret != (len & ~(SHA1_BLOCK_SIZE - 1)));
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data += ret;
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len -= ret;
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}
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store:
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/* anything left? */
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if (len)
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memcpy(sctx->buf + index , data, len);
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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 s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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u64 bits;
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unsigned int index, end;
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int ret;
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/* must perform manual padding */
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index = sctx->count & 0x3f;
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end = (index < 56) ? SHA1_BLOCK_SIZE : (2 * SHA1_BLOCK_SIZE);
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/* start pad with 1 */
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sctx->buf[index] = 0x80;
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/* pad with zeros */
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index++;
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memset(sctx->buf + index, 0x00, end - index - 8);
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/* append message length */
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bits = sctx->count * 8;
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memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
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ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf, end);
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BUG_ON(ret != end);
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/* copy digest to out */
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memcpy(out, sctx->state, SHA1_DIGEST_SIZE);
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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_driver_name= "sha1-s390",
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.cra_priority = CRYPT_S390_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_sha1_ctx),
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.cra_module = THIS_MODULE,
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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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if (!crypt_s390_func_available(KIMD_SHA_1))
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return -EOPNOTSUPP;
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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_ALIAS("sha1");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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