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/*
* Cryptographic API.
*
* s390 implementation of the SHA1 Secure Hash Algorithm.
*
* Derived from cryptoapi implementation, adapted for in-place
* scatterlist interface. Originally based on the public domain
* implementation written by Steve Reid.
*
* s390 Version:
* Copyright IBM Corp. 2003,2007
* Author(s): Thomas Spatzier
* Jan Glauber (jan.glauber@de.ibm.com)
*
* Derived from "crypto/sha1_generic.c"
* Copyright (c) Alan Smithee.
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include "crypt_s390.h"
#define SHA1_DIGEST_SIZE 20
#define SHA1_BLOCK_SIZE 64
struct s390_sha1_ctx {
u64 count; /* message length */
u32 state[5];
u8 buf[2 * SHA1_BLOCK_SIZE];
};
static void sha1_init(struct crypto_tfm *tfm)
{
struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
sctx->state[0] = 0x67452301;
sctx->state[1] = 0xEFCDAB89;
sctx->state[2] = 0x98BADCFE;
sctx->state[3] = 0x10325476;
sctx->state[4] = 0xC3D2E1F0;
sctx->count = 0;
}
static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
unsigned int len)
{
struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
unsigned int index;
int ret;
/* how much is already in the buffer? */
index = sctx->count & 0x3f;
sctx->count += len;
if (index + len < SHA1_BLOCK_SIZE)
goto store;
/* process one stored block */
if (index) {
memcpy(sctx->buf + index, data, SHA1_BLOCK_SIZE - index);
ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf,
SHA1_BLOCK_SIZE);
BUG_ON(ret != SHA1_BLOCK_SIZE);
data += SHA1_BLOCK_SIZE - index;
len -= SHA1_BLOCK_SIZE - index;
}
/* process as many blocks as possible */
if (len >= SHA1_BLOCK_SIZE) {
ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, data,
len & ~(SHA1_BLOCK_SIZE - 1));
BUG_ON(ret != (len & ~(SHA1_BLOCK_SIZE - 1)));
data += ret;
len -= ret;
}
store:
/* anything left? */
if (len)
memcpy(sctx->buf + index , data, len);
}
/* Add padding and return the message digest. */
static void sha1_final(struct crypto_tfm *tfm, u8 *out)
{
struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
u64 bits;
unsigned int index, end;
int ret;
/* must perform manual padding */
index = sctx->count & 0x3f;
end = (index < 56) ? SHA1_BLOCK_SIZE : (2 * SHA1_BLOCK_SIZE);
/* start pad with 1 */
sctx->buf[index] = 0x80;
/* pad with zeros */
index++;
memset(sctx->buf + index, 0x00, end - index - 8);
/* append message length */
bits = sctx->count * 8;
memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf, end);
BUG_ON(ret != end);
/* copy digest to out */
memcpy(out, sctx->state, SHA1_DIGEST_SIZE);
/* wipe context */
memset(sctx, 0, sizeof *sctx);
}
static struct crypto_alg alg = {
.cra_name = "sha1",
.cra_driver_name= "sha1-s390",
.cra_priority = CRYPT_S390_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_sha1_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_u = { .digest = {
.dia_digestsize = SHA1_DIGEST_SIZE,
.dia_init = sha1_init,
.dia_update = sha1_update,
.dia_final = sha1_final } }
};
static int __init init(void)
{
if (!crypt_s390_func_available(KIMD_SHA_1))
return -EOPNOTSUPP;
return crypto_register_alg(&alg);
}
static void __exit fini(void)
{
crypto_unregister_alg(&alg);
}
module_init(init);
module_exit(fini);
MODULE_ALIAS("sha1");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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