kernel-fxtec-pro1x/arch/s390/crypto/sha1_s390.c
Jan Glauber 86aa9fc245 [S390] move crypto options and some cleanup.
This patch moves the config options for the s390 crypto instructions
to the standard "Hardware crypto devices" menu. In addition some
cleanup has been done: use a flag for supported keylengths, add a
warning about machien limitation, return ENOTSUPP in case the
hardware has no support, remove superfluous printks and update
email addresses.

Signed-off-by: Jan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-02-05 21:18:14 +01:00

160 lines
4 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.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/mm.h>
#include <linux/crypto.h>
#include <asm/scatterlist.h>
#include <asm/byteorder.h>
#include "crypt_s390.h"
#define SHA1_DIGEST_SIZE 20
#define SHA1_BLOCK_SIZE 64
struct crypt_s390_sha1_ctx {
u64 count;
u32 state[5];
u32 buf_len;
u8 buffer[2 * SHA1_BLOCK_SIZE];
};
static void sha1_init(struct crypto_tfm *tfm)
{
struct crypt_s390_sha1_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->count = 0;
ctx->buf_len = 0;
}
static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
unsigned int len)
{
struct crypt_s390_sha1_ctx *sctx;
long imd_len;
sctx = crypto_tfm_ctx(tfm);
sctx->count += len * 8; /* message bit length */
/* anything in buffer yet? -> must be completed */
if (sctx->buf_len && (sctx->buf_len + len) >= SHA1_BLOCK_SIZE) {
/* complete full block and hash */
memcpy(sctx->buffer + sctx->buf_len, data,
SHA1_BLOCK_SIZE - sctx->buf_len);
crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer,
SHA1_BLOCK_SIZE);
data += SHA1_BLOCK_SIZE - sctx->buf_len;
len -= SHA1_BLOCK_SIZE - sctx->buf_len;
sctx->buf_len = 0;
}
/* rest of data contains full blocks? */
imd_len = len & ~0x3ful;
if (imd_len) {
crypt_s390_kimd(KIMD_SHA_1, sctx->state, data, imd_len);
data += imd_len;
len -= imd_len;
}
/* anything left? store in buffer */
if (len) {
memcpy(sctx->buffer + sctx->buf_len , data, len);
sctx->buf_len += len;
}
}
static void pad_message(struct crypt_s390_sha1_ctx* sctx)
{
int index;
index = sctx->buf_len;
sctx->buf_len = (sctx->buf_len < 56) ?
SHA1_BLOCK_SIZE:2 * SHA1_BLOCK_SIZE;
/* start pad with 1 */
sctx->buffer[index] = 0x80;
/* pad with zeros */
index++;
memset(sctx->buffer + index, 0x00, sctx->buf_len - index);
/* append length */
memcpy(sctx->buffer + sctx->buf_len - 8, &sctx->count,
sizeof sctx->count);
}
/* Add padding and return the message digest. */
static void sha1_final(struct crypto_tfm *tfm, u8 *out)
{
struct crypt_s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
/* must perform manual padding */
pad_message(sctx);
crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, sctx->buf_len);
/* 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 crypt_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");