crypto: octeon - add MD5 module
Add OCTEON MD5 module. Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Aaro Koskinen
Herbert Xu
parent
011f3c6cbb
commit
1953c22f53
@ -3,3 +3,5 @@
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#
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obj-y += octeon-crypto.o
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obj-$(CONFIG_CRYPTO_MD5_OCTEON) += octeon-md5.o
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@ -14,6 +14,8 @@
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#include <linux/sched.h>
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#include <asm/mipsregs.h>
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#define OCTEON_CR_OPCODE_PRIORITY 300
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extern unsigned long octeon_crypto_enable(struct octeon_cop2_state *state);
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extern void octeon_crypto_disable(struct octeon_cop2_state *state,
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unsigned long flags);
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216
arch/mips/cavium-octeon/crypto/octeon-md5.c
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216
arch/mips/cavium-octeon/crypto/octeon-md5.c
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@ -0,0 +1,216 @@
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/*
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* Cryptographic API.
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*
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* MD5 Message Digest Algorithm (RFC1321).
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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/md5.c, which is:
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*
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* Derived from cryptoapi implementation, originally based on the
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* public domain implementation written by Colin Plumb in 1993.
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*
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* Copyright (c) Cryptoapi developers.
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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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 <crypto/md5.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 <linux/string.h>
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#include <asm/byteorder.h>
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#include <linux/cryptohash.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_md5_store_hash(struct md5_state *ctx)
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{
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u64 *hash = (u64 *)ctx->hash;
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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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}
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static void octeon_md5_read_hash(struct md5_state *ctx)
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{
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u64 *hash = (u64 *)ctx->hash;
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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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}
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static void octeon_md5_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_md5_start(block[7]);
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}
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static int octeon_md5_init(struct shash_desc *desc)
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{
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struct md5_state *mctx = shash_desc_ctx(desc);
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mctx->hash[0] = cpu_to_le32(0x67452301);
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mctx->hash[1] = cpu_to_le32(0xefcdab89);
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mctx->hash[2] = cpu_to_le32(0x98badcfe);
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mctx->hash[3] = cpu_to_le32(0x10325476);
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mctx->byte_count = 0;
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return 0;
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}
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static int octeon_md5_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct md5_state *mctx = shash_desc_ctx(desc);
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const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
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struct octeon_cop2_state state;
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unsigned long flags;
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mctx->byte_count += len;
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if (avail > len) {
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, len);
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return 0;
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}
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data,
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avail);
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local_bh_disable();
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preempt_disable();
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flags = octeon_crypto_enable(&state);
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octeon_md5_store_hash(mctx);
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octeon_md5_transform(mctx->block);
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data += avail;
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len -= avail;
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while (len >= sizeof(mctx->block)) {
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octeon_md5_transform(data);
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data += sizeof(mctx->block);
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len -= sizeof(mctx->block);
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}
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octeon_md5_read_hash(mctx);
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octeon_crypto_disable(&state, flags);
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preempt_enable();
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local_bh_enable();
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memcpy(mctx->block, data, len);
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return 0;
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}
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static int octeon_md5_final(struct shash_desc *desc, u8 *out)
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{
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struct md5_state *mctx = shash_desc_ctx(desc);
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const unsigned int offset = mctx->byte_count & 0x3f;
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char *p = (char *)mctx->block + offset;
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int padding = 56 - (offset + 1);
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struct octeon_cop2_state state;
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unsigned long flags;
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*p++ = 0x80;
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local_bh_disable();
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preempt_disable();
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flags = octeon_crypto_enable(&state);
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octeon_md5_store_hash(mctx);
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if (padding < 0) {
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memset(p, 0x00, padding + sizeof(u64));
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octeon_md5_transform(mctx->block);
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p = (char *)mctx->block;
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padding = 56;
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}
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memset(p, 0, padding);
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mctx->block[14] = cpu_to_le32(mctx->byte_count << 3);
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mctx->block[15] = cpu_to_le32(mctx->byte_count >> 29);
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octeon_md5_transform(mctx->block);
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octeon_md5_read_hash(mctx);
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octeon_crypto_disable(&state, flags);
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preempt_enable();
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local_bh_enable();
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memcpy(out, mctx->hash, sizeof(mctx->hash));
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memset(mctx, 0, sizeof(*mctx));
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return 0;
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}
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static int octeon_md5_export(struct shash_desc *desc, void *out)
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{
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struct md5_state *ctx = shash_desc_ctx(desc);
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memcpy(out, ctx, sizeof(*ctx));
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return 0;
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}
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static int octeon_md5_import(struct shash_desc *desc, const void *in)
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{
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struct md5_state *ctx = shash_desc_ctx(desc);
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memcpy(ctx, in, sizeof(*ctx));
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return 0;
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}
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static struct shash_alg alg = {
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.digestsize = MD5_DIGEST_SIZE,
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.init = octeon_md5_init,
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.update = octeon_md5_update,
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.final = octeon_md5_final,
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.export = octeon_md5_export,
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.import = octeon_md5_import,
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.descsize = sizeof(struct md5_state),
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.statesize = sizeof(struct md5_state),
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.base = {
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.cra_name = "md5",
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.cra_driver_name= "octeon-md5",
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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 = MD5_HMAC_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 md5_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_shash(&alg);
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}
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static void __exit md5_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(md5_mod_init);
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module_exit(md5_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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