Commit | Line | Data |
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604973f1 JG |
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 | ||
563f346d | 16 | #include <crypto/internal/hash.h> |
3a4c5d59 | 17 | #include <linux/module.h> |
c7d4d259 | 18 | #include <asm/cpacf.h> |
604973f1 | 19 | #include "sha.h" |
604973f1 | 20 | |
563f346d | 21 | int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
604973f1 | 22 | { |
563f346d HX |
23 | struct s390_sha_ctx *ctx = shash_desc_ctx(desc); |
24 | unsigned int bsize = crypto_shash_blocksize(desc->tfm); | |
0177db01 | 25 | unsigned int index, n; |
604973f1 JG |
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); | |
0177db01 | 37 | cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize); |
604973f1 JG |
38 | data += bsize - index; |
39 | len -= bsize - index; | |
9d20b571 | 40 | index = 0; |
604973f1 JG |
41 | } |
42 | ||
43 | /* process as many blocks as possible */ | |
44 | if (len >= bsize) { | |
0177db01 MS |
45 | n = len & ~(bsize - 1); |
46 | cpacf_kimd(ctx->func, ctx->state, data, n); | |
47 | data += n; | |
48 | len -= n; | |
604973f1 JG |
49 | } |
50 | store: | |
51 | if (len) | |
52 | memcpy(ctx->buf + index , data, len); | |
563f346d HX |
53 | |
54 | return 0; | |
604973f1 JG |
55 | } |
56 | EXPORT_SYMBOL_GPL(s390_sha_update); | |
57 | ||
563f346d | 58 | int s390_sha_final(struct shash_desc *desc, u8 *out) |
604973f1 | 59 | { |
563f346d HX |
60 | struct s390_sha_ctx *ctx = shash_desc_ctx(desc); |
61 | unsigned int bsize = crypto_shash_blocksize(desc->tfm); | |
604973f1 | 62 | u64 bits; |
291dc7c0 | 63 | unsigned int index, end, plen; |
604973f1 | 64 | |
291dc7c0 JG |
65 | /* SHA-512 uses 128 bit padding length */ |
66 | plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8; | |
67 | ||
604973f1 JG |
68 | /* must perform manual padding */ |
69 | index = ctx->count & (bsize - 1); | |
291dc7c0 | 70 | end = (index < bsize - plen) ? bsize : (2 * bsize); |
604973f1 JG |
71 | |
72 | /* start pad with 1 */ | |
73 | ctx->buf[index] = 0x80; | |
74 | index++; | |
75 | ||
76 | /* pad with zeros */ | |
77 | memset(ctx->buf + index, 0x00, end - index - 8); | |
78 | ||
291dc7c0 | 79 | /* |
1537a363 | 80 | * Append message length. Well, SHA-512 wants a 128 bit length value, |
291dc7c0 JG |
81 | * nevertheless we use u64, should be enough for now... |
82 | */ | |
604973f1 JG |
83 | bits = ctx->count * 8; |
84 | memcpy(ctx->buf + end - 8, &bits, sizeof(bits)); | |
0177db01 | 85 | cpacf_kimd(ctx->func, ctx->state, ctx->buf, end); |
604973f1 JG |
86 | |
87 | /* copy digest to out */ | |
563f346d | 88 | memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm)); |
604973f1 JG |
89 | /* wipe context */ |
90 | memset(ctx, 0, sizeof *ctx); | |
563f346d HX |
91 | |
92 | return 0; | |
604973f1 JG |
93 | } |
94 | EXPORT_SYMBOL_GPL(s390_sha_final); | |
95 | ||
96 | MODULE_LICENSE("GPL"); | |
97 | MODULE_DESCRIPTION("s390 SHA cipher common functions"); |