279 lines
6.9 KiB
C
279 lines
6.9 KiB
C
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/*
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* Cryptographic API.
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*
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* SHA-224 and SHA-256 Secure Hash Algorithm.
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*
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* Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
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*
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* Based on crypto/sha256_generic.c, which is:
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*
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* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/mm.h>
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#include <crypto/sha.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <asm/byteorder.h>
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#include <asm/octeon/octeon.h>
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#include <crypto/internal/hash.h>
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#include "octeon-crypto.h"
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/*
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* We pass everything as 64-bit. OCTEON can handle misaligned data.
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*/
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static void octeon_sha256_store_hash(struct sha256_state *sctx)
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{
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u64 *hash = (u64 *)sctx->state;
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write_octeon_64bit_hash_dword(hash[0], 0);
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write_octeon_64bit_hash_dword(hash[1], 1);
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write_octeon_64bit_hash_dword(hash[2], 2);
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write_octeon_64bit_hash_dword(hash[3], 3);
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}
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static void octeon_sha256_read_hash(struct sha256_state *sctx)
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{
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u64 *hash = (u64 *)sctx->state;
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hash[0] = read_octeon_64bit_hash_dword(0);
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hash[1] = read_octeon_64bit_hash_dword(1);
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hash[2] = read_octeon_64bit_hash_dword(2);
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hash[3] = read_octeon_64bit_hash_dword(3);
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}
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static void octeon_sha256_transform(const void *_block)
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{
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const u64 *block = _block;
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write_octeon_64bit_block_dword(block[0], 0);
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write_octeon_64bit_block_dword(block[1], 1);
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write_octeon_64bit_block_dword(block[2], 2);
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write_octeon_64bit_block_dword(block[3], 3);
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write_octeon_64bit_block_dword(block[4], 4);
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write_octeon_64bit_block_dword(block[5], 5);
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write_octeon_64bit_block_dword(block[6], 6);
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octeon_sha256_start(block[7]);
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}
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static int octeon_sha224_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA224_H0;
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sctx->state[1] = SHA224_H1;
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sctx->state[2] = SHA224_H2;
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sctx->state[3] = SHA224_H3;
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sctx->state[4] = SHA224_H4;
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sctx->state[5] = SHA224_H5;
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sctx->state[6] = SHA224_H6;
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sctx->state[7] = SHA224_H7;
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sctx->count = 0;
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return 0;
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}
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static int octeon_sha256_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA256_H0;
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sctx->state[1] = SHA256_H1;
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sctx->state[2] = SHA256_H2;
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sctx->state[3] = SHA256_H3;
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sctx->state[4] = SHA256_H4;
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sctx->state[5] = SHA256_H5;
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sctx->state[6] = SHA256_H6;
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sctx->state[7] = SHA256_H7;
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sctx->count = 0;
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return 0;
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}
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static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data,
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unsigned int len)
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{
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unsigned int partial;
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unsigned int done;
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const u8 *src;
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partial = sctx->count % SHA256_BLOCK_SIZE;
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sctx->count += len;
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done = 0;
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src = data;
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if ((partial + len) >= SHA256_BLOCK_SIZE) {
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if (partial) {
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done = -partial;
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memcpy(sctx->buf + partial, data,
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done + SHA256_BLOCK_SIZE);
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src = sctx->buf;
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}
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do {
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octeon_sha256_transform(src);
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done += SHA256_BLOCK_SIZE;
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src = data + done;
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} while (done + SHA256_BLOCK_SIZE <= len);
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partial = 0;
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}
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memcpy(sctx->buf + partial, src, len - done);
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}
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static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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struct octeon_cop2_state state;
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unsigned long flags;
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/*
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* Small updates never reach the crypto engine, so the generic sha256 is
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* faster because of the heavyweight octeon_crypto_enable() /
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* octeon_crypto_disable().
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*/
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if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
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return crypto_sha256_update(desc, data, len);
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flags = octeon_crypto_enable(&state);
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octeon_sha256_store_hash(sctx);
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__octeon_sha256_update(sctx, data, len);
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octeon_sha256_read_hash(sctx);
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octeon_crypto_disable(&state, flags);
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return 0;
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}
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static int octeon_sha256_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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static const u8 padding[64] = { 0x80, };
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struct octeon_cop2_state state;
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__be32 *dst = (__be32 *)out;
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unsigned int pad_len;
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unsigned long flags;
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unsigned int index;
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__be64 bits;
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int i;
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/* Save number of bits. */
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64. */
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index = sctx->count & 0x3f;
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pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
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flags = octeon_crypto_enable(&state);
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octeon_sha256_store_hash(sctx);
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__octeon_sha256_update(sctx, padding, pad_len);
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/* Append length (before padding). */
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__octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
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octeon_sha256_read_hash(sctx);
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octeon_crypto_disable(&state, flags);
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Zeroize sensitive information. */
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memset(sctx, 0, sizeof(*sctx));
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return 0;
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}
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static int octeon_sha224_final(struct shash_desc *desc, u8 *hash)
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{
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u8 D[SHA256_DIGEST_SIZE];
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octeon_sha256_final(desc, D);
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memcpy(hash, D, SHA224_DIGEST_SIZE);
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memzero_explicit(D, SHA256_DIGEST_SIZE);
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return 0;
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}
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static int octeon_sha256_export(struct shash_desc *desc, void *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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static int octeon_sha256_import(struct shash_desc *desc, const void *in)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static struct shash_alg octeon_sha256_algs[2] = { {
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.digestsize = SHA256_DIGEST_SIZE,
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.init = octeon_sha256_init,
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.update = octeon_sha256_update,
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.final = octeon_sha256_final,
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.export = octeon_sha256_export,
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.import = octeon_sha256_import,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name= "octeon-sha256",
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.cra_priority = OCTEON_CR_OPCODE_PRIORITY,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.digestsize = SHA224_DIGEST_SIZE,
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.init = octeon_sha224_init,
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.update = octeon_sha256_update,
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.final = octeon_sha224_final,
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.descsize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name= "octeon-sha224",
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.cra_blocksize = SHA224_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 octeon_sha256_mod_init(void)
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{
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if (!octeon_has_crypto())
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return -ENOTSUPP;
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return crypto_register_shashes(octeon_sha256_algs,
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ARRAY_SIZE(octeon_sha256_algs));
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}
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static void __exit octeon_sha256_mod_fini(void)
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{
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crypto_unregister_shashes(octeon_sha256_algs,
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ARRAY_SIZE(octeon_sha256_algs));
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}
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module_init(octeon_sha256_mod_init);
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module_exit(octeon_sha256_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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