98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
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/*
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* Cryptographic API.
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*
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* s390 generic implementation of the SHA Secure Hash Algorithms.
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*
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* Copyright IBM Corp. 2007
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* Author(s): Jan Glauber (jang@de.ibm.com)
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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 <crypto/internal/hash.h>
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#include <linux/module.h>
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#include <asm/cpacf.h>
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#include "sha.h"
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int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
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unsigned int bsize = crypto_shash_blocksize(desc->tfm);
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unsigned int index, n;
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/* how much is already in the buffer? */
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index = ctx->count & (bsize - 1);
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ctx->count += len;
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if ((index + len) < bsize)
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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(ctx->buf + index, data, bsize - index);
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cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
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data += bsize - index;
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len -= bsize - index;
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index = 0;
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}
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/* process as many blocks as possible */
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if (len >= bsize) {
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n = len & ~(bsize - 1);
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cpacf_kimd(ctx->func, ctx->state, data, n);
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data += n;
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len -= n;
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}
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store:
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if (len)
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memcpy(ctx->buf + index , data, len);
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return 0;
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}
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EXPORT_SYMBOL_GPL(s390_sha_update);
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int s390_sha_final(struct shash_desc *desc, u8 *out)
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{
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struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
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unsigned int bsize = crypto_shash_blocksize(desc->tfm);
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u64 bits;
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unsigned int index, end, plen;
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/* SHA-512 uses 128 bit padding length */
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plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
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/* must perform manual padding */
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index = ctx->count & (bsize - 1);
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end = (index < bsize - plen) ? bsize : (2 * bsize);
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/* start pad with 1 */
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ctx->buf[index] = 0x80;
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index++;
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/* pad with zeros */
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memset(ctx->buf + index, 0x00, end - index - 8);
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/*
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* Append message length. Well, SHA-512 wants a 128 bit length value,
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* nevertheless we use u64, should be enough for now...
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*/
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bits = ctx->count * 8;
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memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
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cpacf_kimd(ctx->func, ctx->state, ctx->buf, end);
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/* copy digest to out */
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memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
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/* wipe context */
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memset(ctx, 0, sizeof *ctx);
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return 0;
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}
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EXPORT_SYMBOL_GPL(s390_sha_final);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("s390 SHA cipher common functions");
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