From 604973f1fe41b817c1badb3df2008fe641e50ae6 Mon Sep 17 00:00:00 2001 From: Jan Glauber Date: Thu, 6 Mar 2008 19:50:20 +0800 Subject: [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 Signed-off-by: Herbert Xu --- arch/s390/crypto/sha_common.c | 90 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 arch/s390/crypto/sha_common.c (limited to 'arch/s390/crypto/sha_common.c') diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c new file mode 100644 index 000000000000..80b6f2ba005e --- /dev/null +++ b/arch/s390/crypto/sha_common.c @@ -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 +#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; + int ret; + + /* must perform manual padding */ + index = ctx->count & (bsize - 1); + end = (index < bsize - 8) ? bsize : (2 * bsize); + + /* start pad with 1 */ + ctx->buf[index] = 0x80; + index++; + + /* pad with zeros */ + memset(ctx->buf + index, 0x00, end - index - 8); + + 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"); -- cgit v1.2.3