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/*
* Cryptographic API.
*
* s390 generic implementation of the SHA Secure Hash Algorithms.
*
* Copyright IBM Corp. 2007
* Author(s): Jan Glauber (jang@de.ibm.com)
*
* 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/crypto.h>
#include "sha.h"
#include "crypt_s390.h"
void s390_sha_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
{
struct s390_sha_ctx *ctx = crypto_tfm_ctx(tfm);
unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
unsigned int index;
int ret;
/* how much is already in the buffer? */
index = ctx->count & (bsize - 1);
ctx->count += len;
if ((index + len) < bsize)
goto store;
/* process one stored block */
if (index) {
memcpy(ctx->buf + index, data, bsize - index);
ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize);
BUG_ON(ret != bsize);
data += bsize - index;
len -= bsize - index;
}
/* process as many blocks as possible */
if (len >= bsize) {
ret = crypt_s390_kimd(ctx->func, ctx->state, data,
len & ~(bsize - 1));
BUG_ON(ret != (len & ~(bsize - 1)));
data += ret;
len -= ret;
}
store:
if (len)
memcpy(ctx->buf + index , data, len);
}
EXPORT_SYMBOL_GPL(s390_sha_update);
void s390_sha_final(struct crypto_tfm *tfm, u8 *out)
{
struct s390_sha_ctx *ctx = crypto_tfm_ctx(tfm);
unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
u64 bits;
unsigned int index, end, plen;
int ret;
/* SHA-512 uses 128 bit padding length */
plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
/* must perform manual padding */
index = ctx->count & (bsize - 1);
end = (index < bsize - plen) ? bsize : (2 * bsize);
/* start pad with 1 */
ctx->buf[index] = 0x80;
index++;
/* pad with zeros */
memset(ctx->buf + index, 0x00, end - index - 8);
/*
* Append message length. Well, SHA-512 wants a 128 bit lenght value,
* nevertheless we use u64, should be enough for now...
*/
bits = ctx->count * 8;
memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end);
BUG_ON(ret != end);
/* copy digest to out */
memcpy(out, ctx->state, crypto_hash_digestsize(crypto_hash_cast(tfm)));
/* wipe context */
memset(ctx, 0, sizeof *ctx);
}
EXPORT_SYMBOL_GPL(s390_sha_final);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("s390 SHA cipher common functions");
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