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/*
* Cryptographic API.
*
* MD5 Message Digest Algorithm (RFC1321).
*
* Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
*
* Based on crypto/md5.c, which is:
*
* Derived from cryptoapi implementation, originally based on the
* public domain implementation written by Colin Plumb in 1993.
*
* Copyright (c) Cryptoapi developers.
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <crypto/md5.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/byteorder.h>
#include <linux/cryptohash.h>
#include <asm/octeon/octeon.h>
#include <crypto/internal/hash.h>
#include "octeon-crypto.h"
/*
* We pass everything as 64-bit. OCTEON can handle misaligned data.
*/
static void octeon_md5_store_hash(struct md5_state *ctx)
{
u64 *hash = (u64 *)ctx->hash;
write_octeon_64bit_hash_dword(hash[0], 0);
write_octeon_64bit_hash_dword(hash[1], 1);
}
static void octeon_md5_read_hash(struct md5_state *ctx)
{
u64 *hash = (u64 *)ctx->hash;
hash[0] = read_octeon_64bit_hash_dword(0);
hash[1] = read_octeon_64bit_hash_dword(1);
}
static void octeon_md5_transform(const void *_block)
{
const u64 *block = _block;
write_octeon_64bit_block_dword(block[0], 0);
write_octeon_64bit_block_dword(block[1], 1);
write_octeon_64bit_block_dword(block[2], 2);
write_octeon_64bit_block_dword(block[3], 3);
write_octeon_64bit_block_dword(block[4], 4);
write_octeon_64bit_block_dword(block[5], 5);
write_octeon_64bit_block_dword(block[6], 6);
octeon_md5_start(block[7]);
}
static int octeon_md5_init(struct shash_desc *desc)
{
struct md5_state *mctx = shash_desc_ctx(desc);
mctx->hash[0] = cpu_to_le32(MD5_H0);
mctx->hash[1] = cpu_to_le32(MD5_H1);
mctx->hash[2] = cpu_to_le32(MD5_H2);
mctx->hash[3] = cpu_to_le32(MD5_H3);
mctx->byte_count = 0;
return 0;
}
static int octeon_md5_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct md5_state *mctx = shash_desc_ctx(desc);
const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
struct octeon_cop2_state state;
unsigned long flags;
mctx->byte_count += len;
if (avail > len) {
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
data, len);
return 0;
}
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data,
avail);
flags = octeon_crypto_enable(&state);
octeon_md5_store_hash(mctx);
octeon_md5_transform(mctx->block);
data += avail;
len -= avail;
while (len >= sizeof(mctx->block)) {
octeon_md5_transform(data);
data += sizeof(mctx->block);
len -= sizeof(mctx->block);
}
octeon_md5_read_hash(mctx);
octeon_crypto_disable(&state, flags);
memcpy(mctx->block, data, len);
return 0;
}
static int octeon_md5_final(struct shash_desc *desc, u8 *out)
{
struct md5_state *mctx = shash_desc_ctx(desc);
const unsigned int offset = mctx->byte_count & 0x3f;
char *p = (char *)mctx->block + offset;
int padding = 56 - (offset + 1);
struct octeon_cop2_state state;
unsigned long flags;
*p++ = 0x80;
flags = octeon_crypto_enable(&state);
octeon_md5_store_hash(mctx);
if (padding < 0) {
memset(p, 0x00, padding + sizeof(u64));
octeon_md5_transform(mctx->block);
p = (char *)mctx->block;
padding = 56;
}
memset(p, 0, padding);
mctx->block[14] = cpu_to_le32(mctx->byte_count << 3);
mctx->block[15] = cpu_to_le32(mctx->byte_count >> 29);
octeon_md5_transform(mctx->block);
octeon_md5_read_hash(mctx);
octeon_crypto_disable(&state, flags);
memcpy(out, mctx->hash, sizeof(mctx->hash));
memset(mctx, 0, sizeof(*mctx));
return 0;
}
static int octeon_md5_export(struct shash_desc *desc, void *out)
{
struct md5_state *ctx = shash_desc_ctx(desc);
memcpy(out, ctx, sizeof(*ctx));
return 0;
}
static int octeon_md5_import(struct shash_desc *desc, const void *in)
{
struct md5_state *ctx = shash_desc_ctx(desc);
memcpy(ctx, in, sizeof(*ctx));
return 0;
}
static struct shash_alg alg = {
.digestsize = MD5_DIGEST_SIZE,
.init = octeon_md5_init,
.update = octeon_md5_update,
.final = octeon_md5_final,
.export = octeon_md5_export,
.import = octeon_md5_import,
.descsize = sizeof(struct md5_state),
.statesize = sizeof(struct md5_state),
.base = {
.cra_name = "md5",
.cra_driver_name= "octeon-md5",
.cra_priority = OCTEON_CR_OPCODE_PRIORITY,
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
static int __init md5_mod_init(void)
{
if (!octeon_has_crypto())
return -ENOTSUPP;
return crypto_register_shash(&alg);
}
static void __exit md5_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
module_init(md5_mod_init);
module_exit(md5_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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