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// SPDX-License-Identifier: GPL-2.0+
/*
* Cryptographic API.
*
* s390 generic implementation of the SHA Secure Hash Algorithms.
*
* Copyright IBM Corp. 2007
* Author(s): Jan Glauber (jang@de.ibm.com)
*/
#include <crypto/internal/hash.h>
#include <linux/module.h>
#include <asm/cpacf.h>
#include "sha.h"
int s390_sha_update_blocks(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
unsigned int bsize = crypto_shash_blocksize(desc->tfm);
struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
unsigned int n;
int fc;
fc = ctx->func;
if (ctx->first_message_part)
fc |= CPACF_KIMD_NIP;
/* process as many blocks as possible */
n = (len / bsize) * bsize;
ctx->count += n;
switch (ctx->func) {
case CPACF_KLMD_SHA_512:
case CPACF_KLMD_SHA3_384:
if (ctx->count < n)
ctx->sha512.count_hi++;
break;
}
cpacf_kimd(fc, ctx->state, data, n);
ctx->first_message_part = 0;
return len - n;
}
EXPORT_SYMBOL_GPL(s390_sha_update_blocks);
static int s390_crypto_shash_parmsize(int func)
{
switch (func) {
case CPACF_KLMD_SHA_1:
return 20;
case CPACF_KLMD_SHA_256:
return 32;
case CPACF_KLMD_SHA_512:
return 64;
case CPACF_KLMD_SHA3_224:
case CPACF_KLMD_SHA3_256:
case CPACF_KLMD_SHA3_384:
case CPACF_KLMD_SHA3_512:
return 200;
default:
return -EINVAL;
}
}
int s390_sha_finup(struct shash_desc *desc, const u8 *src, unsigned int len,
u8 *out)
{
struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
int mbl_offset, fc;
u64 bits;
ctx->count += len;
bits = ctx->count * 8;
mbl_offset = s390_crypto_shash_parmsize(ctx->func);
if (mbl_offset < 0)
return -EINVAL;
mbl_offset = mbl_offset / sizeof(u32);
/* set total msg bit length (mbl) in CPACF parmblock */
switch (ctx->func) {
case CPACF_KLMD_SHA_512:
/* The SHA512 parmblock has a 128-bit mbl field. */
if (ctx->count < len)
ctx->sha512.count_hi++;
ctx->sha512.count_hi <<= 3;
ctx->sha512.count_hi |= ctx->count >> 61;
mbl_offset += sizeof(u64) / sizeof(u32);
fallthrough;
case CPACF_KLMD_SHA_1:
case CPACF_KLMD_SHA_256:
memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
break;
case CPACF_KLMD_SHA3_224:
case CPACF_KLMD_SHA3_256:
case CPACF_KLMD_SHA3_384:
case CPACF_KLMD_SHA3_512:
break;
default:
return -EINVAL;
}
fc = ctx->func;
fc |= test_facility(86) ? CPACF_KLMD_DUFOP : 0;
if (ctx->first_message_part)
fc |= CPACF_KLMD_NIP;
cpacf_klmd(fc, ctx->state, src, len);
/* copy digest to out */
memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
return 0;
}
EXPORT_SYMBOL_GPL(s390_sha_finup);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("s390 SHA cipher common functions");
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