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
s390_sha_update(struct shash_desc * desc,const u8 * data,unsigned int len)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
s390_crypto_shash_parmsize(int func)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
s390_sha_final(struct shash_desc * desc,u8 * out)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, mbl_offset;
78
79 n = ctx->count % bsize;
80 bits = ctx->count * 8;
81 mbl_offset = s390_crypto_shash_parmsize(ctx->func) / sizeof(u32);
82 if (mbl_offset < 0)
83 return -EINVAL;
84
85 /* set total msg bit length (mbl) in CPACF parmblock */
86 switch (ctx->func) {
87 case CPACF_KLMD_SHA_1:
88 case CPACF_KLMD_SHA_256:
89 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
90 break;
91 case CPACF_KLMD_SHA_512:
92 /*
93 * the SHA512 parmblock has a 128-bit mbl field, clear
94 * high-order u64 field, copy bits to low-order u64 field
95 */
96 memset(ctx->state + mbl_offset, 0x00, sizeof(bits));
97 mbl_offset += sizeof(u64) / sizeof(u32);
98 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
99 break;
100 case CPACF_KLMD_SHA3_224:
101 case CPACF_KLMD_SHA3_256:
102 case CPACF_KLMD_SHA3_384:
103 case CPACF_KLMD_SHA3_512:
104 break;
105 default:
106 return -EINVAL;
107 }
108
109 cpacf_klmd(ctx->func, ctx->state, ctx->buf, n);
110
111 /* copy digest to out */
112 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
113 /* wipe context */
114 memset(ctx, 0, sizeof *ctx);
115
116 return 0;
117 }
118 EXPORT_SYMBOL_GPL(s390_sha_final);
119
120 MODULE_LICENSE("GPL");
121 MODULE_DESCRIPTION("s390 SHA cipher common functions");
122
