forked from Minki/linux
864cbeed4a
This implements the SHA1 secure hash algorithm using the AArch32 versions of the ARMv8 Crypto Extensions for SHA1. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <crypto/internal/hash.h>
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#include <crypto/sha.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include <asm/crypto/sha1.h>
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#include <asm/hwcap.h>
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <asm/unaligned.h>
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MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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asmlinkage void sha1_ce_transform(int blocks, u8 const *src, u32 *state,
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u8 *head);
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static int sha1_init(struct shash_desc *desc)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha1_state){
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.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
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};
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return 0;
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}
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static int sha1_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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unsigned int partial;
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if (!may_use_simd())
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return sha1_update_arm(desc, data, len);
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partial = sctx->count % SHA1_BLOCK_SIZE;
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sctx->count += len;
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if ((partial + len) >= SHA1_BLOCK_SIZE) {
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int blocks;
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if (partial) {
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int p = SHA1_BLOCK_SIZE - partial;
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memcpy(sctx->buffer + partial, data, p);
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data += p;
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len -= p;
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}
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blocks = len / SHA1_BLOCK_SIZE;
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len %= SHA1_BLOCK_SIZE;
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kernel_neon_begin();
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sha1_ce_transform(blocks, data, sctx->state,
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partial ? sctx->buffer : NULL);
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kernel_neon_end();
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data += blocks * SHA1_BLOCK_SIZE;
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partial = 0;
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}
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if (len)
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memcpy(sctx->buffer + partial, data, len);
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return 0;
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}
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static int sha1_final(struct shash_desc *desc, u8 *out)
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{
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static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be64 bits = cpu_to_be64(sctx->count << 3);
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__be32 *dst = (__be32 *)out;
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int i;
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u32 padlen = SHA1_BLOCK_SIZE
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- ((sctx->count + sizeof(bits)) % SHA1_BLOCK_SIZE);
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sha1_update(desc, padding, padlen);
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sha1_update(desc, (const u8 *)&bits, sizeof(bits));
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for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha1_state){};
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return 0;
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}
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static int sha1_export(struct shash_desc *desc, void *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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struct sha1_state *dst = out;
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*dst = *sctx;
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return 0;
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}
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static int sha1_import(struct shash_desc *desc, const void *in)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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struct sha1_state const *src = in;
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*sctx = *src;
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return 0;
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}
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static struct shash_alg alg = {
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.init = sha1_init,
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.update = sha1_update,
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.final = sha1_final,
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.export = sha1_export,
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.import = sha1_import,
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.descsize = sizeof(struct sha1_state),
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.digestsize = SHA1_DIGEST_SIZE,
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.statesize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name = "sha1-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha1_ce_mod_init(void)
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{
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if (!(elf_hwcap2 & HWCAP2_SHA1))
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return -ENODEV;
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return crypto_register_shash(&alg);
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}
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static void __exit sha1_ce_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(sha1_ce_mod_init);
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module_exit(sha1_ce_mod_fini);
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