text: /*
   * 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>");
  