// SPDX-License-Identifier: GPL-2.0+
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/*
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* Cryptographic API.
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*
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* s390 generic implementation of the SHA Secure Hash Algorithms.
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*
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* Copyright IBM Corp. 2007
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* Author(s): Jan Glauber (jang@de.ibm.com)
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*/
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#include <crypto/internal/hash.h>
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#include <linux/module.h>
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#include <asm/cpacf.h>
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#include "sha.h"
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int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
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unsigned int bsize = crypto_shash_blocksize(desc->tfm);
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unsigned int index, n;
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/* how much is already in the buffer? */
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index = ctx->count % bsize;
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ctx->count += len;
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if ((index + len) < bsize)
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goto store;
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/* process one stored block */
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if (index) {
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memcpy(ctx->buf + index, data, bsize - index);
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cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
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data += bsize - index;
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len -= bsize - index;
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index = 0;
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}
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/* process as many blocks as possible */
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if (len >= bsize) {
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n = (len / bsize) * bsize;
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cpacf_kimd(ctx->func, ctx->state, data, n);
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data += n;
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len -= n;
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}
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store:
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if (len)
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memcpy(ctx->buf + index , data, len);
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return 0;
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}
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EXPORT_SYMBOL_GPL(s390_sha_update);
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static int s390_crypto_shash_parmsize(int func)
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{
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switch (func) {
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case CPACF_KLMD_SHA_1:
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return 20;
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case CPACF_KLMD_SHA_256:
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return 32;
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case CPACF_KLMD_SHA_512:
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return 64;
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case CPACF_KLMD_SHA3_224:
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case CPACF_KLMD_SHA3_256:
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case CPACF_KLMD_SHA3_384:
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case CPACF_KLMD_SHA3_512:
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return 200;
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default:
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return -EINVAL;
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}
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}
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int s390_sha_final(struct shash_desc *desc, u8 *out)
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{
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struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
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unsigned int bsize = crypto_shash_blocksize(desc->tfm);
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u64 bits;
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unsigned int n;
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int mbl_offset;
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n = ctx->count % bsize;
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bits = ctx->count * 8;
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mbl_offset = s390_crypto_shash_parmsize(ctx->func);
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if (mbl_offset < 0)
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return -EINVAL;
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mbl_offset = mbl_offset / sizeof(u32);
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/* set total msg bit length (mbl) in CPACF parmblock */
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switch (ctx->func) {
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case CPACF_KLMD_SHA_1:
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case CPACF_KLMD_SHA_256:
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memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
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break;
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case CPACF_KLMD_SHA_512:
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/*
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* the SHA512 parmblock has a 128-bit mbl field, clear
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* high-order u64 field, copy bits to low-order u64 field
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*/
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memset(ctx->state + mbl_offset, 0x00, sizeof(bits));
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mbl_offset += sizeof(u64) / sizeof(u32);
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memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
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break;
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case CPACF_KLMD_SHA3_224:
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case CPACF_KLMD_SHA3_256:
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case CPACF_KLMD_SHA3_384:
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case CPACF_KLMD_SHA3_512:
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break;
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default:
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return -EINVAL;
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}
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cpacf_klmd(ctx->func, ctx->state, ctx->buf, n);
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/* copy digest to out */
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memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
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/* wipe context */
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memset(ctx, 0, sizeof *ctx);
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return 0;
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}
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EXPORT_SYMBOL_GPL(s390_sha_final);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("s390 SHA cipher common functions");
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