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");
125