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
16 int 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 }
45 store:
46 if (len)
47 memcpy(ctx->buf + index , data, len);
48
49 return 0;
50 }
51 EXPORT_SYMBOL_GPL(s390_sha_update);
52
53 static 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
72 int 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 }
121 EXPORT_SYMBOL_GPL(s390_sha_final);
122
123 MODULE_LICENSE("GPL");
124 MODULE_DESCRIPTION("s390 SHA cipher common functions");
125
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