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The CPACF instructions can complete with three different condition codes: CC=0 for successful completion, CC=1 if the protected key verification failed, and CC=3 for partial completion. The inline functions will restart the CPACF instruction for partial completion, this removes the CC=3 case. The CC=1 case is only relevant for the protected key functions of the KM, KMC, KMAC and KMCTR instructions. As the protected key functions are not used by the current code, there is no need for any kind of return code handling. Reviewed-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/*
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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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