1 // SPDX-License-Identifier: GPL-2.0+ 1
2 /*
3 * Cryptographic API.
4 *
5 * s390 generic implementation of the SHA Secu
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
16 int s390_sha_update(struct shash_desc *desc, c
17 {
18 struct s390_sha_ctx *ctx = shash_desc_
19 unsigned int bsize = crypto_shash_bloc
20 unsigned int index, n;
21 int fc;
22
23 /* how much is already in the buffer?
24 index = ctx->count % bsize;
25 ctx->count += len;
26
27 if ((index + len) < bsize)
28 goto store;
29
30 fc = ctx->func;
31 if (ctx->first_message_part)
32 fc |= test_facility(86) ? CPAC
33
34 /* process one stored block */
35 if (index) {
36 memcpy(ctx->buf + index, data,
37 cpacf_kimd(fc, ctx->state, ctx
38 ctx->first_message_part = 0;
39 fc &= ~CPACF_KIMD_NIP;
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 n = (len / bsize) * bsize;
48 cpacf_kimd(fc, ctx->state, dat
49 ctx->first_message_part = 0;
50 data += n;
51 len -= n;
52 }
53 store:
54 if (len)
55 memcpy(ctx->buf + index , data
56
57 return 0;
58 }
59 EXPORT_SYMBOL_GPL(s390_sha_update);
60
61 static int s390_crypto_shash_parmsize(int func
62 {
63 switch (func) {
64 case CPACF_KLMD_SHA_1:
65 return 20;
66 case CPACF_KLMD_SHA_256:
67 return 32;
68 case CPACF_KLMD_SHA_512:
69 return 64;
70 case CPACF_KLMD_SHA3_224:
71 case CPACF_KLMD_SHA3_256:
72 case CPACF_KLMD_SHA3_384:
73 case CPACF_KLMD_SHA3_512:
74 return 200;
75 default:
76 return -EINVAL;
77 }
78 }
79
80 int s390_sha_final(struct shash_desc *desc, u8
81 {
82 struct s390_sha_ctx *ctx = shash_desc_
83 unsigned int bsize = crypto_shash_bloc
84 u64 bits;
85 unsigned int n;
86 int mbl_offset, fc;
87
88 n = ctx->count % bsize;
89 bits = ctx->count * 8;
90 mbl_offset = s390_crypto_shash_parmsiz
91 if (mbl_offset < 0)
92 return -EINVAL;
93
94 mbl_offset = mbl_offset / sizeof(u32);
95
96 /* set total msg bit length (mbl) in C
97 switch (ctx->func) {
98 case CPACF_KLMD_SHA_1:
99 case CPACF_KLMD_SHA_256:
100 memcpy(ctx->state + mbl_offset
101 break;
102 case CPACF_KLMD_SHA_512:
103 /*
104 * the SHA512 parmblock has a
105 * high-order u64 field, copy
106 */
107 memset(ctx->state + mbl_offset
108 mbl_offset += sizeof(u64) / si
109 memcpy(ctx->state + mbl_offset
110 break;
111 case CPACF_KLMD_SHA3_224:
112 case CPACF_KLMD_SHA3_256:
113 case CPACF_KLMD_SHA3_384:
114 case CPACF_KLMD_SHA3_512:
115 break;
116 default:
117 return -EINVAL;
118 }
119
120 fc = ctx->func;
121 fc |= test_facility(86) ? CPACF_KLMD_D
122 if (ctx->first_message_part)
123 fc |= CPACF_KLMD_NIP;
124 cpacf_klmd(fc, ctx->state, ctx->buf, n
125
126 /* copy digest to out */
127 memcpy(out, ctx->state, crypto_shash_d
128 /* wipe context */
129 memset(ctx, 0, sizeof *ctx);
130
131 return 0;
132 }
133 EXPORT_SYMBOL_GPL(s390_sha_final);
134
135 MODULE_LICENSE("GPL");
136 MODULE_DESCRIPTION("s390 SHA cipher common fun
137
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