4 * s390 generic implementation of the SHA Secure Hash Algorithms.
6 * Copyright IBM Corp. 2007
7 * Author(s): Jan Glauber (jang@de.ibm.com)
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
16 #include <crypto/internal/hash.h>
18 #include "crypt_s390.h"
20 int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
22 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
23 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
27 /* how much is already in the buffer? */
28 index = ctx->count & (bsize - 1);
31 if ((index + len) < bsize)
34 /* process one stored block */
36 memcpy(ctx->buf + index, data, bsize - index);
37 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize);
39 data += bsize - index;
44 /* process as many blocks as possible */
46 ret = crypt_s390_kimd(ctx->func, ctx->state, data,
48 BUG_ON(ret != (len & ~(bsize - 1)));
54 memcpy(ctx->buf + index , data, len);
58 EXPORT_SYMBOL_GPL(s390_sha_update);
60 int s390_sha_final(struct shash_desc *desc, u8 *out)
62 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
63 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
65 unsigned int index, end, plen;
68 /* SHA-512 uses 128 bit padding length */
69 plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
71 /* must perform manual padding */
72 index = ctx->count & (bsize - 1);
73 end = (index < bsize - plen) ? bsize : (2 * bsize);
75 /* start pad with 1 */
76 ctx->buf[index] = 0x80;
80 memset(ctx->buf + index, 0x00, end - index - 8);
83 * Append message length. Well, SHA-512 wants a 128 bit length value,
84 * nevertheless we use u64, should be enough for now...
86 bits = ctx->count * 8;
87 memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
89 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end);
92 /* copy digest to out */
93 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
95 memset(ctx, 0, sizeof *ctx);
99 EXPORT_SYMBOL_GPL(s390_sha_final);
101 MODULE_LICENSE("GPL");
102 MODULE_DESCRIPTION("s390 SHA cipher common functions");