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1// SPDX-License-Identifier: GPL-2.0+
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)
9 */
10
11#include <crypto/internal/hash.h>
12#include <linux/module.h>
13#include <asm/cpacf.h>
14#include "sha.h"
15
16int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
17{
18 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
19 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
20 unsigned int index, n;
21
22 /* how much is already in the buffer? */
23 index = ctx->count % bsize;
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);
32 cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
33 data += bsize - index;
34 len -= bsize - index;
35 index = 0;
36 }
37
38 /* process as many blocks as possible */
39 if (len >= bsize) {
40 n = (len / bsize) * bsize;
41 cpacf_kimd(ctx->func, ctx->state, data, n);
42 data += n;
43 len -= n;
44 }
45store:
46 if (len)
47 memcpy(ctx->buf + index , data, len);
48
49 return 0;
50}
51EXPORT_SYMBOL_GPL(s390_sha_update);
52
53static int s390_crypto_shash_parmsize(int func)
54{
55 switch (func) {
56 case CPACF_KLMD_SHA_1:
57 return 20;
58 case CPACF_KLMD_SHA_256:
59 return 32;
60 case CPACF_KLMD_SHA_512:
61 return 64;
62 case CPACF_KLMD_SHA3_224:
63 case CPACF_KLMD_SHA3_256:
64 case CPACF_KLMD_SHA3_384:
65 case CPACF_KLMD_SHA3_512:
66 return 200;
67 default:
68 return -EINVAL;
69 }
70}
71
72int s390_sha_final(struct shash_desc *desc, u8 *out)
73{
74 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
75 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
76 u64 bits;
77 unsigned int n;
78 int mbl_offset;
79
80 n = ctx->count % bsize;
81 bits = ctx->count * 8;
82 mbl_offset = s390_crypto_shash_parmsize(ctx->func);
83 if (mbl_offset < 0)
84 return -EINVAL;
85
86 mbl_offset = mbl_offset / sizeof(u32);
87
88 /* set total msg bit length (mbl) in CPACF parmblock */
89 switch (ctx->func) {
90 case CPACF_KLMD_SHA_1:
91 case CPACF_KLMD_SHA_256:
92 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
93 break;
94 case CPACF_KLMD_SHA_512:
95 /*
96 * the SHA512 parmblock has a 128-bit mbl field, clear
97 * high-order u64 field, copy bits to low-order u64 field
98 */
99 memset(ctx->state + mbl_offset, 0x00, sizeof(bits));
100 mbl_offset += sizeof(u64) / sizeof(u32);
101 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
102 break;
103 case CPACF_KLMD_SHA3_224:
104 case CPACF_KLMD_SHA3_256:
105 case CPACF_KLMD_SHA3_384:
106 case CPACF_KLMD_SHA3_512:
107 break;
108 default:
109 return -EINVAL;
110 }
111
112 cpacf_klmd(ctx->func, ctx->state, ctx->buf, n);
113
114 /* copy digest to out */
115 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
116 /* wipe context */
117 memset(ctx, 0, sizeof *ctx);
118
119 return 0;
120}
121EXPORT_SYMBOL_GPL(s390_sha_final);
122
123MODULE_LICENSE("GPL");
124MODULE_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 <linux/module.h>
18#include <asm/cpacf.h>
19#include "sha.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, n;
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 cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
38 data += bsize - index;
39 len -= bsize - index;
40 index = 0;
41 }
42
43 /* process as many blocks as possible */
44 if (len >= bsize) {
45 n = len & ~(bsize - 1);
46 cpacf_kimd(ctx->func, ctx->state, data, n);
47 data += n;
48 len -= n;
49 }
50store:
51 if (len)
52 memcpy(ctx->buf + index , data, len);
53
54 return 0;
55}
56EXPORT_SYMBOL_GPL(s390_sha_update);
57
58int s390_sha_final(struct shash_desc *desc, u8 *out)
59{
60 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
61 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
62 u64 bits;
63 unsigned int index, end, plen;
64
65 /* SHA-512 uses 128 bit padding length */
66 plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
67
68 /* must perform manual padding */
69 index = ctx->count & (bsize - 1);
70 end = (index < bsize - plen) ? bsize : (2 * bsize);
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
79 /*
80 * Append message length. Well, SHA-512 wants a 128 bit length value,
81 * nevertheless we use u64, should be enough for now...
82 */
83 bits = ctx->count * 8;
84 memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
85 cpacf_kimd(ctx->func, ctx->state, ctx->buf, end);
86
87 /* copy digest to out */
88 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
89 /* wipe context */
90 memset(ctx, 0, sizeof *ctx);
91
92 return 0;
93}
94EXPORT_SYMBOL_GPL(s390_sha_final);
95
96MODULE_LICENSE("GPL");
97MODULE_DESCRIPTION("s390 SHA cipher common functions");