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a876ca4dde
Now that the SPDX tag is in all arch/s390/crypto/ files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#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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