278 lines
7.5 KiB
C
278 lines
7.5 KiB
C
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/*
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* Cryptographic API.
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*
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* SHA-512 and SHA-384 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/sha512_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) 2003 Kyle McMartin <kyle@debian.org>
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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
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* Free Software Foundation; either version 2, or (at your option) any
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* 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_sha512_store_hash(struct sha512_state *sctx)
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{
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write_octeon_64bit_hash_sha512(sctx->state[0], 0);
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write_octeon_64bit_hash_sha512(sctx->state[1], 1);
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write_octeon_64bit_hash_sha512(sctx->state[2], 2);
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write_octeon_64bit_hash_sha512(sctx->state[3], 3);
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write_octeon_64bit_hash_sha512(sctx->state[4], 4);
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write_octeon_64bit_hash_sha512(sctx->state[5], 5);
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write_octeon_64bit_hash_sha512(sctx->state[6], 6);
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write_octeon_64bit_hash_sha512(sctx->state[7], 7);
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}
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static void octeon_sha512_read_hash(struct sha512_state *sctx)
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{
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sctx->state[0] = read_octeon_64bit_hash_sha512(0);
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sctx->state[1] = read_octeon_64bit_hash_sha512(1);
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sctx->state[2] = read_octeon_64bit_hash_sha512(2);
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sctx->state[3] = read_octeon_64bit_hash_sha512(3);
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sctx->state[4] = read_octeon_64bit_hash_sha512(4);
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sctx->state[5] = read_octeon_64bit_hash_sha512(5);
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sctx->state[6] = read_octeon_64bit_hash_sha512(6);
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sctx->state[7] = read_octeon_64bit_hash_sha512(7);
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}
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static void octeon_sha512_transform(const void *_block)
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{
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const u64 *block = _block;
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write_octeon_64bit_block_sha512(block[0], 0);
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write_octeon_64bit_block_sha512(block[1], 1);
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write_octeon_64bit_block_sha512(block[2], 2);
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write_octeon_64bit_block_sha512(block[3], 3);
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write_octeon_64bit_block_sha512(block[4], 4);
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write_octeon_64bit_block_sha512(block[5], 5);
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write_octeon_64bit_block_sha512(block[6], 6);
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write_octeon_64bit_block_sha512(block[7], 7);
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write_octeon_64bit_block_sha512(block[8], 8);
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write_octeon_64bit_block_sha512(block[9], 9);
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write_octeon_64bit_block_sha512(block[10], 10);
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write_octeon_64bit_block_sha512(block[11], 11);
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write_octeon_64bit_block_sha512(block[12], 12);
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write_octeon_64bit_block_sha512(block[13], 13);
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write_octeon_64bit_block_sha512(block[14], 14);
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octeon_sha512_start(block[15]);
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}
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static int octeon_sha512_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA512_H0;
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sctx->state[1] = SHA512_H1;
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sctx->state[2] = SHA512_H2;
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sctx->state[3] = SHA512_H3;
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sctx->state[4] = SHA512_H4;
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sctx->state[5] = SHA512_H5;
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sctx->state[6] = SHA512_H6;
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sctx->state[7] = SHA512_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static int octeon_sha384_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA384_H0;
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sctx->state[1] = SHA384_H1;
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sctx->state[2] = SHA384_H2;
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sctx->state[3] = SHA384_H3;
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sctx->state[4] = SHA384_H4;
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sctx->state[5] = SHA384_H5;
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sctx->state[6] = SHA384_H6;
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sctx->state[7] = SHA384_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static void __octeon_sha512_update(struct sha512_state *sctx, const u8 *data,
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unsigned int len)
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{
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unsigned int part_len;
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unsigned int index;
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unsigned int i;
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/* Compute number of bytes mod 128. */
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index = sctx->count[0] % SHA512_BLOCK_SIZE;
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/* Update number of bytes. */
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if ((sctx->count[0] += len) < len)
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sctx->count[1]++;
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part_len = SHA512_BLOCK_SIZE - index;
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/* Transform as many times as possible. */
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if (len >= part_len) {
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memcpy(&sctx->buf[index], data, part_len);
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octeon_sha512_transform(sctx->buf);
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for (i = part_len; i + SHA512_BLOCK_SIZE <= len;
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i += SHA512_BLOCK_SIZE)
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octeon_sha512_transform(&data[i]);
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index = 0;
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} else {
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i = 0;
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}
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/* Buffer remaining input. */
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memcpy(&sctx->buf[index], &data[i], len - i);
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}
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static int octeon_sha512_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha512_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 sha512 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[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
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return crypto_sha512_update(desc, data, len);
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flags = octeon_crypto_enable(&state);
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octeon_sha512_store_hash(sctx);
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__octeon_sha512_update(sctx, data, len);
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octeon_sha512_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_sha512_final(struct shash_desc *desc, u8 *hash)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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static u8 padding[128] = { 0x80, };
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struct octeon_cop2_state state;
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__be64 *dst = (__be64 *)hash;
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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[2];
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int i;
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/* Save number of bits. */
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bits[1] = cpu_to_be64(sctx->count[0] << 3);
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bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
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/* Pad out to 112 mod 128. */
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index = sctx->count[0] & 0x7f;
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pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
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flags = octeon_crypto_enable(&state);
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octeon_sha512_store_hash(sctx);
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__octeon_sha512_update(sctx, padding, pad_len);
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/* Append length (before padding). */
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__octeon_sha512_update(sctx, (const u8 *)bits, sizeof(bits));
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octeon_sha512_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_be64(sctx->state[i]);
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/* Zeroize sensitive information. */
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memset(sctx, 0, sizeof(struct sha512_state));
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return 0;
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}
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static int octeon_sha384_final(struct shash_desc *desc, u8 *hash)
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{
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u8 D[64];
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octeon_sha512_final(desc, D);
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memcpy(hash, D, 48);
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memzero_explicit(D, 64);
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return 0;
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}
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static struct shash_alg octeon_sha512_algs[2] = { {
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.digestsize = SHA512_DIGEST_SIZE,
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.init = octeon_sha512_init,
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.update = octeon_sha512_update,
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.final = octeon_sha512_final,
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.descsize = sizeof(struct sha512_state),
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.base = {
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.cra_name = "sha512",
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.cra_driver_name= "octeon-sha512",
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.cra_priority = OCTEON_CR_OPCODE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA512_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.digestsize = SHA384_DIGEST_SIZE,
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.init = octeon_sha384_init,
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.update = octeon_sha512_update,
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.final = octeon_sha384_final,
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.descsize = sizeof(struct sha512_state),
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.base = {
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.cra_name = "sha384",
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.cra_driver_name= "octeon-sha384",
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.cra_priority = OCTEON_CR_OPCODE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA384_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_sha512_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_sha512_algs,
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ARRAY_SIZE(octeon_sha512_algs));
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}
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static void __exit octeon_sha512_mod_fini(void)
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{
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crypto_unregister_shashes(octeon_sha512_algs,
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ARRAY_SIZE(octeon_sha512_algs));
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}
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module_init(octeon_sha512_mod_init);
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module_exit(octeon_sha512_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms (OCTEON)");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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