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[CRYPTO] s390: Generic sha_update and sha_final
The sha_{update|final} functions are similar for every sha variant.
Since that is error-prone and redundant replace these functions by
a shared generic implementation for s390.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| /* | ||
| * 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. | ||
| * | ||
| */ | ||
| #ifndef _CRYPTO_ARCH_S390_SHA_H | ||
| #define _CRYPTO_ARCH_S390_SHA_H | ||
|
|
||
| #include <linux/crypto.h> | ||
| #include <crypto/sha.h> | ||
|
|
||
| /* must be big enough for the largest SHA variant */ | ||
| #define SHA_MAX_BLOCK_SIZE SHA256_BLOCK_SIZE | ||
|
|
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| struct s390_sha_ctx { | ||
| u64 count; /* message length in bytes */ | ||
| u32 state[8]; | ||
| u8 buf[2 * SHA_MAX_BLOCK_SIZE]; | ||
| int func; /* KIMD function to use */ | ||
| }; | ||
|
|
||
| void s390_sha_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len); | ||
| void s390_sha_final(struct crypto_tfm *tfm, u8 *out); | ||
|
|
||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * 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; | ||
|
|
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| /* 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); | ||
|
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||
| 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; | ||
| int ret; | ||
|
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| /* must perform manual padding */ | ||
| index = ctx->count & (bsize - 1); | ||
| end = (index < bsize - 8) ? bsize : (2 * bsize); | ||
|
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| /* start pad with 1 */ | ||
| ctx->buf[index] = 0x80; | ||
| index++; | ||
|
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| /* pad with zeros */ | ||
| memset(ctx->buf + index, 0x00, end - index - 8); | ||
|
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| bits = ctx->count * 8; | ||
| memcpy(ctx->buf + end - 8, &bits, sizeof(bits)); | ||
|
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| ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end); | ||
| BUG_ON(ret != end); | ||
|
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| /* 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); | ||
|
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| MODULE_LICENSE("GPL"); | ||
| MODULE_DESCRIPTION("s390 SHA cipher common functions"); |