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208 lines
4.9 KiB
208 lines
4.9 KiB
/* |
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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 <[email protected]>. |
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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 <[email protected]> |
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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 <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] = MD5_H0; |
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mctx->hash[1] = MD5_H1; |
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mctx->hash[2] = MD5_H2; |
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mctx->hash[3] = MD5_H3; |
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cpu_to_le32_array(mctx->hash, 4); |
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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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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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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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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] = mctx->byte_count << 3; |
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mctx->block[15] = mctx->byte_count >> 29; |
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cpu_to_le32_array(mctx->block + 14, 2); |
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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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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_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 <[email protected]>");
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