Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cryptographic API. |
| 3 | * |
| 4 | * MD5 Message Digest Algorithm (RFC1321). |
| 5 | * |
| 6 | * Derived from cryptoapi implementation, originally based on the |
| 7 | * public domain implementation written by Colin Plumb in 1993. |
| 8 | * |
| 9 | * Copyright (c) Cryptoapi developers. |
| 10 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify it |
| 13 | * under the terms of the GNU General Public License as published by the Free |
| 14 | * Software Foundation; either version 2 of the License, or (at your option) |
| 15 | * any later version. |
| 16 | * |
| 17 | */ |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 18 | #include <crypto/internal/hash.h> |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 19 | #include <crypto/md5.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/init.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/string.h> |
Herbert Xu | 06ace7a | 2005-10-30 21:25:15 +1100 | [diff] [blame] | 23 | #include <linux/types.h> |
David S. Miller | 2468b89 | 2011-08-03 19:45:10 -0700 | [diff] [blame] | 24 | #include <linux/cryptohash.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/byteorder.h> |
| 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | /* XXX: this stuff can be optimized */ |
| 28 | static inline void le32_to_cpu_array(u32 *buf, unsigned int words) |
| 29 | { |
| 30 | while (words--) { |
| 31 | __le32_to_cpus(buf); |
| 32 | buf++; |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static inline void cpu_to_le32_array(u32 *buf, unsigned int words) |
| 37 | { |
| 38 | while (words--) { |
| 39 | __cpu_to_le32s(buf); |
| 40 | buf++; |
| 41 | } |
| 42 | } |
| 43 | |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 44 | static inline void md5_transform_helper(struct md5_state *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
| 46 | le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); |
| 47 | md5_transform(ctx->hash, ctx->block); |
| 48 | } |
| 49 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 50 | static int md5_init(struct shash_desc *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 52 | struct md5_state *mctx = shash_desc_ctx(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | mctx->hash[0] = 0x67452301; |
| 55 | mctx->hash[1] = 0xefcdab89; |
| 56 | mctx->hash[2] = 0x98badcfe; |
| 57 | mctx->hash[3] = 0x10325476; |
| 58 | mctx->byte_count = 0; |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 59 | |
| 60 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 63 | static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 65 | struct md5_state *mctx = shash_desc_ctx(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); |
| 67 | |
| 68 | mctx->byte_count += len; |
| 69 | |
| 70 | if (avail > len) { |
| 71 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
| 72 | data, len); |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 73 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
| 77 | data, avail); |
| 78 | |
| 79 | md5_transform_helper(mctx); |
| 80 | data += avail; |
| 81 | len -= avail; |
| 82 | |
| 83 | while (len >= sizeof(mctx->block)) { |
| 84 | memcpy(mctx->block, data, sizeof(mctx->block)); |
| 85 | md5_transform_helper(mctx); |
| 86 | data += sizeof(mctx->block); |
| 87 | len -= sizeof(mctx->block); |
| 88 | } |
| 89 | |
| 90 | memcpy(mctx->block, data, len); |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 91 | |
| 92 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 95 | static int md5_final(struct shash_desc *desc, u8 *out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 97 | struct md5_state *mctx = shash_desc_ctx(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | const unsigned int offset = mctx->byte_count & 0x3f; |
| 99 | char *p = (char *)mctx->block + offset; |
| 100 | int padding = 56 - (offset + 1); |
| 101 | |
| 102 | *p++ = 0x80; |
| 103 | if (padding < 0) { |
| 104 | memset(p, 0x00, padding + sizeof (u64)); |
| 105 | md5_transform_helper(mctx); |
| 106 | p = (char *)mctx->block; |
| 107 | padding = 56; |
| 108 | } |
| 109 | |
| 110 | memset(p, 0, padding); |
| 111 | mctx->block[14] = mctx->byte_count << 3; |
| 112 | mctx->block[15] = mctx->byte_count >> 29; |
| 113 | le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - |
| 114 | sizeof(u64)) / sizeof(u32)); |
| 115 | md5_transform(mctx->hash, mctx->block); |
| 116 | cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32)); |
| 117 | memcpy(out, mctx->hash, sizeof(mctx->hash)); |
| 118 | memset(mctx, 0, sizeof(*mctx)); |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 119 | |
| 120 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
| 122 | |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 123 | static int md5_export(struct shash_desc *desc, void *out) |
| 124 | { |
| 125 | struct md5_state *ctx = shash_desc_ctx(desc); |
| 126 | |
| 127 | memcpy(out, ctx, sizeof(*ctx)); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int md5_import(struct shash_desc *desc, const void *in) |
| 132 | { |
| 133 | struct md5_state *ctx = shash_desc_ctx(desc); |
| 134 | |
| 135 | memcpy(ctx, in, sizeof(*ctx)); |
| 136 | return 0; |
| 137 | } |
| 138 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 139 | static struct shash_alg alg = { |
| 140 | .digestsize = MD5_DIGEST_SIZE, |
| 141 | .init = md5_init, |
| 142 | .update = md5_update, |
| 143 | .final = md5_final, |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame] | 144 | .export = md5_export, |
| 145 | .import = md5_import, |
| 146 | .descsize = sizeof(struct md5_state), |
Herbert Xu | eebb111 | 2010-03-02 21:58:16 +0800 | [diff] [blame] | 147 | .statesize = sizeof(struct md5_state), |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 148 | .base = { |
| 149 | .cra_name = "md5", |
| 150 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
| 151 | .cra_blocksize = MD5_HMAC_BLOCK_SIZE, |
| 152 | .cra_module = THIS_MODULE, |
| 153 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | }; |
| 155 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 156 | static int __init md5_mod_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | { |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 158 | return crypto_register_shash(&alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 161 | static void __exit md5_mod_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | { |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 163 | crypto_unregister_shash(&alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 166 | module_init(md5_mod_init); |
| 167 | module_exit(md5_mod_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | MODULE_LICENSE("GPL"); |
| 170 | MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); |