160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/*
|
|
* 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 <crypto/sha.h>
|
|
|
|
#include "crypt_s390.h"
|
|
|
|
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] = SHA1_H0;
|
|
sctx->state[1] = SHA1_H1;
|
|
sctx->state[2] = SHA1_H2;
|
|
sctx->state[3] = SHA1_H3;
|
|
sctx->state[4] = SHA1_H4;
|
|
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");
|