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106 lines
2.6 KiB
106 lines
2.6 KiB
/* |
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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 "sha.h" |
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#include "crypt_s390.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; |
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int ret; |
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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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ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize); |
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if (ret != bsize) |
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return -EIO; |
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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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ret = crypt_s390_kimd(ctx->func, ctx->state, data, |
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len & ~(bsize - 1)); |
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if (ret != (len & ~(bsize - 1))) |
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return -EIO; |
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data += ret; |
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len -= ret; |
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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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int ret; |
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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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ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end); |
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if (ret != end) |
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return -EIO; |
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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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