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124 lines
2.8 KiB
124 lines
2.8 KiB
// 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 ([email protected]) |
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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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