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1/*
2 * Cryptographic API.
3 *
4 * s390 generic implementation of the SHA Secure Hash Algorithms.
5 *
6 * Copyright IBM Corp. 2007
7 * Author(s): Jan Glauber (jang@de.ibm.com)
8 *
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)
12 * any later version.
13 *
14 */
15
16#include <crypto/internal/hash.h>
17#include <linux/module.h>
18#include "sha.h"
19#include "crypt_s390.h"
20
21int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
22{
23 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
24 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
25 unsigned int index;
26 int ret;
27
28 /* how much is already in the buffer? */
29 index = ctx->count & (bsize - 1);
30 ctx->count += len;
31
32 if ((index + len) < bsize)
33 goto store;
34
35 /* process one stored block */
36 if (index) {
37 memcpy(ctx->buf + index, data, bsize - index);
38 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize);
39 BUG_ON(ret != bsize);
40 data += bsize - index;
41 len -= bsize - index;
42 index = 0;
43 }
44
45 /* process as many blocks as possible */
46 if (len >= bsize) {
47 ret = crypt_s390_kimd(ctx->func, ctx->state, data,
48 len & ~(bsize - 1));
49 BUG_ON(ret != (len & ~(bsize - 1)));
50 data += ret;
51 len -= ret;
52 }
53store:
54 if (len)
55 memcpy(ctx->buf + index , data, len);
56
57 return 0;
58}
59EXPORT_SYMBOL_GPL(s390_sha_update);
60
61int s390_sha_final(struct shash_desc *desc, u8 *out)
62{
63 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
64 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
65 u64 bits;
66 unsigned int index, end, plen;
67 int ret;
68
69 /* SHA-512 uses 128 bit padding length */
70 plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
71
72 /* must perform manual padding */
73 index = ctx->count & (bsize - 1);
74 end = (index < bsize - plen) ? bsize : (2 * bsize);
75
76 /* start pad with 1 */
77 ctx->buf[index] = 0x80;
78 index++;
79
80 /* pad with zeros */
81 memset(ctx->buf + index, 0x00, end - index - 8);
82
83 /*
84 * Append message length. Well, SHA-512 wants a 128 bit length value,
85 * nevertheless we use u64, should be enough for now...
86 */
87 bits = ctx->count * 8;
88 memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
89
90 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end);
91 BUG_ON(ret != end);
92
93 /* copy digest to out */
94 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
95 /* wipe context */
96 memset(ctx, 0, sizeof *ctx);
97
98 return 0;
99}
100EXPORT_SYMBOL_GPL(s390_sha_final);
101
102MODULE_LICENSE("GPL");
103MODULE_DESCRIPTION("s390 SHA cipher common functions");
1/*
2 * Cryptographic API.
3 *
4 * s390 generic implementation of the SHA Secure Hash Algorithms.
5 *
6 * Copyright IBM Corp. 2007
7 * Author(s): Jan Glauber (jang@de.ibm.com)
8 *
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)
12 * any later version.
13 *
14 */
15
16#include <crypto/internal/hash.h>
17#include "sha.h"
18#include "crypt_s390.h"
19
20int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
21{
22 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
23 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
24 unsigned int index;
25 int ret;
26
27 /* how much is already in the buffer? */
28 index = ctx->count & (bsize - 1);
29 ctx->count += len;
30
31 if ((index + len) < bsize)
32 goto store;
33
34 /* process one stored block */
35 if (index) {
36 memcpy(ctx->buf + index, data, bsize - index);
37 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize);
38 BUG_ON(ret != bsize);
39 data += bsize - index;
40 len -= bsize - index;
41 index = 0;
42 }
43
44 /* process as many blocks as possible */
45 if (len >= bsize) {
46 ret = crypt_s390_kimd(ctx->func, ctx->state, data,
47 len & ~(bsize - 1));
48 BUG_ON(ret != (len & ~(bsize - 1)));
49 data += ret;
50 len -= ret;
51 }
52store:
53 if (len)
54 memcpy(ctx->buf + index , data, len);
55
56 return 0;
57}
58EXPORT_SYMBOL_GPL(s390_sha_update);
59
60int s390_sha_final(struct shash_desc *desc, u8 *out)
61{
62 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
63 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
64 u64 bits;
65 unsigned int index, end, plen;
66 int ret;
67
68 /* SHA-512 uses 128 bit padding length */
69 plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
70
71 /* must perform manual padding */
72 index = ctx->count & (bsize - 1);
73 end = (index < bsize - plen) ? bsize : (2 * bsize);
74
75 /* start pad with 1 */
76 ctx->buf[index] = 0x80;
77 index++;
78
79 /* pad with zeros */
80 memset(ctx->buf + index, 0x00, end - index - 8);
81
82 /*
83 * Append message length. Well, SHA-512 wants a 128 bit length value,
84 * nevertheless we use u64, should be enough for now...
85 */
86 bits = ctx->count * 8;
87 memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
88
89 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end);
90 BUG_ON(ret != end);
91
92 /* copy digest to out */
93 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
94 /* wipe context */
95 memset(ctx, 0, sizeof *ctx);
96
97 return 0;
98}
99EXPORT_SYMBOL_GPL(s390_sha_final);
100
101MODULE_LICENSE("GPL");
102MODULE_DESCRIPTION("s390 SHA cipher common functions");