1 // SPDX-License-Identifier: GPL-2.0+
5 * s390 generic implementation of the SHA Secure Hash Algorithms.
7 * Copyright IBM Corp. 2007
8 * Author(s): Jan Glauber (jang@de.ibm.com)
11 #include <crypto/internal/hash.h>
12 #include <linux/module.h>
13 #include <asm/cpacf.h>
16 int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
18 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
19 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
20 unsigned int index, n;
22 /* how much is already in the buffer? */
23 index = ctx->count % bsize;
26 if ((index + len) < bsize)
29 /* process one stored block */
31 memcpy(ctx->buf + index, data, bsize - index);
32 cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
33 data += bsize - index;
38 /* process as many blocks as possible */
40 n = (len / bsize) * bsize;
41 cpacf_kimd(ctx->func, ctx->state, data, n);
47 memcpy(ctx->buf + index , data, len);
51 EXPORT_SYMBOL_GPL(s390_sha_update);
53 static int s390_crypto_shash_parmsize(int func)
56 case CPACF_KLMD_SHA_1:
58 case CPACF_KLMD_SHA_256:
60 case CPACF_KLMD_SHA_512:
62 case CPACF_KLMD_SHA3_224:
63 case CPACF_KLMD_SHA3_256:
64 case CPACF_KLMD_SHA3_384:
65 case CPACF_KLMD_SHA3_512:
72 int s390_sha_final(struct shash_desc *desc, u8 *out)
74 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
75 unsigned int bsize = crypto_shash_blocksize(desc->tfm);
77 unsigned int n, mbl_offset;
79 n = ctx->count % bsize;
80 bits = ctx->count * 8;
81 mbl_offset = s390_crypto_shash_parmsize(ctx->func) / sizeof(u32);
85 /* set total msg bit length (mbl) in CPACF parmblock */
87 case CPACF_KLMD_SHA_1:
88 case CPACF_KLMD_SHA_256:
89 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
91 case CPACF_KLMD_SHA_512:
93 * the SHA512 parmblock has a 128-bit mbl field, clear
94 * high-order u64 field, copy bits to low-order u64 field
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));
100 case CPACF_KLMD_SHA3_224:
101 case CPACF_KLMD_SHA3_256:
102 case CPACF_KLMD_SHA3_384:
103 case CPACF_KLMD_SHA3_512:
109 cpacf_klmd(ctx->func, ctx->state, ctx->buf, n);
111 /* copy digest to out */
112 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
114 memset(ctx, 0, sizeof *ctx);
118 EXPORT_SYMBOL_GPL(s390_sha_final);
120 MODULE_LICENSE("GPL");
121 MODULE_DESCRIPTION("s390 SHA cipher common functions");