cavium-octeon/crypto/octeon-md5.c

0001 /*
0002  * Cryptographic API.
0003  *
0004  * MD5 Message Digest Algorithm (RFC1321).
0005  *
0006  * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
0007  *
0008  * Based on crypto/md5.c, which is:
0009  *
0010  * Derived from cryptoapi implementation, originally based on the
0011  * public domain implementation written by Colin Plumb in 1993.
0012  *
0013  * Copyright (c) Cryptoapi developers.
0014  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
0015  *
0016  * This program is free software; you can redistribute it and/or modify it
0017  * under the terms of the GNU General Public License as published by the Free
0018  * Software Foundation; either version 2 of the License, or (at your option)
0019  * any later version.
0020  */
0021
0022 #include <crypto/md5.h>
0023 #include <linux/init.h>
0024 #include <linux/types.h>
0025 #include <linux/module.h>
0026 #include <linux/string.h>
0027 #include <asm/byteorder.h>
0028 #include <asm/octeon/octeon.h>
0029 #include <crypto/internal/hash.h>
0030
0031 #include "octeon-crypto.h"
0032
0033 /*
0034  * We pass everything as 64-bit. OCTEON can handle misaligned data.
0035  */
0036
0037 static void octeon_md5_store_hash(struct md5_state *ctx)
0038 {
0039     u64 *hash = (u64 *)ctx->hash;
0040
0041     write_octeon_64bit_hash_dword(hash[0], 0);
0042     write_octeon_64bit_hash_dword(hash[1], 1);
0043 }
0044
0045 static void octeon_md5_read_hash(struct md5_state *ctx)
0046 {
0047     u64 *hash = (u64 *)ctx->hash;
0048
0049     hash[0] = read_octeon_64bit_hash_dword(0);
0050     hash[1] = read_octeon_64bit_hash_dword(1);
0051 }
0052
0053 static void octeon_md5_transform(const void *_block)
0054 {
0055     const u64 *block = _block;
0056
0057     write_octeon_64bit_block_dword(block[0], 0);
0058     write_octeon_64bit_block_dword(block[1], 1);
0059     write_octeon_64bit_block_dword(block[2], 2);
0060     write_octeon_64bit_block_dword(block[3], 3);
0061     write_octeon_64bit_block_dword(block[4], 4);
0062     write_octeon_64bit_block_dword(block[5], 5);
0063     write_octeon_64bit_block_dword(block[6], 6);
0064     octeon_md5_start(block[7]);
0065 }
0066
0067 static int octeon_md5_init(struct shash_desc *desc)
0068 {
0069     struct md5_state *mctx = shash_desc_ctx(desc);
0070
0071     mctx->hash[0] = MD5_H0;
0072     mctx->hash[1] = MD5_H1;
0073     mctx->hash[2] = MD5_H2;
0074     mctx->hash[3] = MD5_H3;
0075     cpu_to_le32_array(mctx->hash, 4);
0076     mctx->byte_count = 0;
0077
0078     return 0;
0079 }
0080
0081 static int octeon_md5_update(struct shash_desc *desc, const u8 *data,
0082                  unsigned int len)
0083 {
0084     struct md5_state *mctx = shash_desc_ctx(desc);
0085     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
0086     struct octeon_cop2_state state;
0087     unsigned long flags;
0088
0089     mctx->byte_count += len;
0090
0091     if (avail > len) {
0092         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
0093                data, len);
0094         return 0;
0095     }
0096
0097     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data,
0098            avail);
0099
0100     flags = octeon_crypto_enable(&state);
0101     octeon_md5_store_hash(mctx);
0102
0103     octeon_md5_transform(mctx->block);
0104     data += avail;
0105     len -= avail;
0106
0107     while (len >= sizeof(mctx->block)) {
0108         octeon_md5_transform(data);
0109         data += sizeof(mctx->block);
0110         len -= sizeof(mctx->block);
0111     }
0112
0113     octeon_md5_read_hash(mctx);
0114     octeon_crypto_disable(&state, flags);
0115
0116     memcpy(mctx->block, data, len);
0117
0118     return 0;
0119 }
0120
0121 static int octeon_md5_final(struct shash_desc *desc, u8 *out)
0122 {
0123     struct md5_state *mctx = shash_desc_ctx(desc);
0124     const unsigned int offset = mctx->byte_count & 0x3f;
0125     char *p = (char *)mctx->block + offset;
0126     int padding = 56 - (offset + 1);
0127     struct octeon_cop2_state state;
0128     unsigned long flags;
0129
0130     *p++ = 0x80;
0131
0132     flags = octeon_crypto_enable(&state);
0133     octeon_md5_store_hash(mctx);
0134
0135     if (padding < 0) {
0136         memset(p, 0x00, padding + sizeof(u64));
0137         octeon_md5_transform(mctx->block);
0138         p = (char *)mctx->block;
0139         padding = 56;
0140     }
0141
0142     memset(p, 0, padding);
0143     mctx->block[14] = mctx->byte_count << 3;
0144     mctx->block[15] = mctx->byte_count >> 29;
0145     cpu_to_le32_array(mctx->block + 14, 2);
0146     octeon_md5_transform(mctx->block);
0147
0148     octeon_md5_read_hash(mctx);
0149     octeon_crypto_disable(&state, flags);
0150
0151     memcpy(out, mctx->hash, sizeof(mctx->hash));
0152     memset(mctx, 0, sizeof(*mctx));
0153
0154     return 0;
0155 }
0156
0157 static int octeon_md5_export(struct shash_desc *desc, void *out)
0158 {
0159     struct md5_state *ctx = shash_desc_ctx(desc);
0160
0161     memcpy(out, ctx, sizeof(*ctx));
0162     return 0;
0163 }
0164
0165 static int octeon_md5_import(struct shash_desc *desc, const void *in)
0166 {
0167     struct md5_state *ctx = shash_desc_ctx(desc);
0168
0169     memcpy(ctx, in, sizeof(*ctx));
0170     return 0;
0171 }
0172
0173 static struct shash_alg alg = {
0174     .digestsize =   MD5_DIGEST_SIZE,
0175     .init       =   octeon_md5_init,
0176     .update     =   octeon_md5_update,
0177     .final      =   octeon_md5_final,
0178     .export     =   octeon_md5_export,
0179     .import     =   octeon_md5_import,
0180     .descsize   =   sizeof(struct md5_state),
0181     .statesize  =   sizeof(struct md5_state),
0182     .base       =   {
0183         .cra_name   =   "md5",
0184         .cra_driver_name=   "octeon-md5",
0185         .cra_priority   =   OCTEON_CR_OPCODE_PRIORITY,
0186         .cra_blocksize  =   MD5_HMAC_BLOCK_SIZE,
0187         .cra_module =   THIS_MODULE,
0188     }
0189 };
0190
0191 static int __init md5_mod_init(void)
0192 {
0193     if (!octeon_has_crypto())
0194         return -ENOTSUPP;
0195     return crypto_register_shash(&alg);
0196 }
0197
0198 static void __exit md5_mod_fini(void)
0199 {
0200     crypto_unregister_shash(&alg);
0201 }
0202
0203 module_init(md5_mod_init);
0204 module_exit(md5_mod_fini);
0205
0206 MODULE_LICENSE("GPL");
0207 MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
0208 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");