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20a884f5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
604973f1 JG |
2 | /* |
3 | * Cryptographic API. | |
4 | * | |
5 | * s390 generic implementation of the SHA Secure Hash Algorithms. | |
6 | * | |
7 | * Copyright IBM Corp. 2007 | |
8 | * Author(s): Jan Glauber (jang@de.ibm.com) | |
604973f1 JG |
9 | */ |
10 | ||
563f346d | 11 | #include <crypto/internal/hash.h> |
3a4c5d59 | 12 | #include <linux/module.h> |
c7d4d259 | 13 | #include <asm/cpacf.h> |
604973f1 | 14 | #include "sha.h" |
604973f1 | 15 | |
563f346d | 16 | int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
604973f1 | 17 | { |
563f346d HX |
18 | struct s390_sha_ctx *ctx = shash_desc_ctx(desc); |
19 | unsigned int bsize = crypto_shash_blocksize(desc->tfm); | |
0177db01 | 20 | unsigned int index, n; |
604973f1 JG |
21 | |
22 | /* how much is already in the buffer? */ | |
23 | index = ctx->count & (bsize - 1); | |
24 | ctx->count += len; | |
25 | ||
26 | if ((index + len) < bsize) | |
27 | goto store; | |
28 | ||
29 | /* process one stored block */ | |
30 | if (index) { | |
31 | memcpy(ctx->buf + index, data, bsize - index); | |
0177db01 | 32 | cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize); |
604973f1 JG |
33 | data += bsize - index; |
34 | len -= bsize - index; | |
9d20b571 | 35 | index = 0; |
604973f1 JG |
36 | } |
37 | ||
38 | /* process as many blocks as possible */ | |
39 | if (len >= bsize) { | |
0177db01 MS |
40 | n = len & ~(bsize - 1); |
41 | cpacf_kimd(ctx->func, ctx->state, data, n); | |
42 | data += n; | |
43 | len -= n; | |
604973f1 JG |
44 | } |
45 | store: | |
46 | if (len) | |
47 | memcpy(ctx->buf + index , data, len); | |
563f346d HX |
48 | |
49 | return 0; | |
604973f1 JG |
50 | } |
51 | EXPORT_SYMBOL_GPL(s390_sha_update); | |
52 | ||
563f346d | 53 | int s390_sha_final(struct shash_desc *desc, u8 *out) |
604973f1 | 54 | { |
563f346d HX |
55 | struct s390_sha_ctx *ctx = shash_desc_ctx(desc); |
56 | unsigned int bsize = crypto_shash_blocksize(desc->tfm); | |
604973f1 | 57 | u64 bits; |
291dc7c0 | 58 | unsigned int index, end, plen; |
604973f1 | 59 | |
291dc7c0 JG |
60 | /* SHA-512 uses 128 bit padding length */ |
61 | plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8; | |
62 | ||
604973f1 JG |
63 | /* must perform manual padding */ |
64 | index = ctx->count & (bsize - 1); | |
291dc7c0 | 65 | end = (index < bsize - plen) ? bsize : (2 * bsize); |
604973f1 JG |
66 | |
67 | /* start pad with 1 */ | |
68 | ctx->buf[index] = 0x80; | |
69 | index++; | |
70 | ||
71 | /* pad with zeros */ | |
72 | memset(ctx->buf + index, 0x00, end - index - 8); | |
73 | ||
291dc7c0 | 74 | /* |
1537a363 | 75 | * Append message length. Well, SHA-512 wants a 128 bit length value, |
291dc7c0 JG |
76 | * nevertheless we use u64, should be enough for now... |
77 | */ | |
604973f1 JG |
78 | bits = ctx->count * 8; |
79 | memcpy(ctx->buf + end - 8, &bits, sizeof(bits)); | |
0177db01 | 80 | cpacf_kimd(ctx->func, ctx->state, ctx->buf, end); |
604973f1 JG |
81 | |
82 | /* copy digest to out */ | |
563f346d | 83 | memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm)); |
604973f1 JG |
84 | /* wipe context */ |
85 | memset(ctx, 0, sizeof *ctx); | |
563f346d HX |
86 | |
87 | return 0; | |
604973f1 JG |
88 | } |
89 | EXPORT_SYMBOL_GPL(s390_sha_final); | |
90 | ||
91 | MODULE_LICENSE("GPL"); | |
92 | MODULE_DESCRIPTION("s390 SHA cipher common functions"); |