| /* |
| * Cryptographic API. |
| * |
| * MD5 Message Digest Algorithm (RFC1321). |
| * |
| * 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/internal/hash.h> |
| #include <crypto/md5.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <asm/byteorder.h> |
| |
| const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = { |
| 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, |
| 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e, |
| }; |
| EXPORT_SYMBOL_GPL(md5_zero_message_hash); |
| |
| #define F1(x, y, z) (z ^ (x & (y ^ z))) |
| #define F2(x, y, z) F1(z, x, y) |
| #define F3(x, y, z) (x ^ y ^ z) |
| #define F4(x, y, z) (y ^ (x | ~z)) |
| |
| #define MD5STEP(f, w, x, y, z, in, s) \ |
| (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x) |
| |
| static void md5_transform(__u32 *hash, __u32 const *in) |
| { |
| u32 a, b, c, d; |
| |
| a = hash[0]; |
| b = hash[1]; |
| c = hash[2]; |
| d = hash[3]; |
| |
| MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); |
| MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); |
| MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); |
| MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); |
| MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); |
| MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); |
| MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); |
| MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); |
| MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); |
| MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); |
| MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); |
| MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); |
| MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); |
| MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); |
| MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); |
| MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); |
| |
| MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); |
| MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); |
| MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); |
| MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); |
| MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); |
| MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); |
| MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); |
| MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); |
| MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); |
| MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); |
| MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); |
| MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); |
| MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); |
| MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); |
| MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); |
| MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); |
| |
| MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); |
| MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); |
| MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); |
| MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); |
| MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); |
| MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); |
| MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); |
| MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); |
| MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); |
| MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); |
| MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); |
| MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); |
| MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); |
| MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); |
| MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); |
| MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); |
| |
| MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); |
| MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); |
| MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); |
| MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); |
| MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); |
| MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); |
| MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); |
| MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); |
| MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); |
| MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); |
| MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); |
| MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); |
| MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); |
| MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); |
| MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); |
| MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); |
| |
| hash[0] += a; |
| hash[1] += b; |
| hash[2] += c; |
| hash[3] += d; |
| } |
| |
| static inline void md5_transform_helper(struct md5_state *ctx) |
| { |
| le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); |
| md5_transform(ctx->hash, ctx->block); |
| } |
| |
| static int md5_init(struct shash_desc *desc) |
| { |
| struct md5_state *mctx = shash_desc_ctx(desc); |
| |
| mctx->hash[0] = MD5_H0; |
| mctx->hash[1] = MD5_H1; |
| mctx->hash[2] = MD5_H2; |
| mctx->hash[3] = MD5_H3; |
| mctx->byte_count = 0; |
| |
| return 0; |
| } |
| |
| static int 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); |
| |
| 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); |
| |
| md5_transform_helper(mctx); |
| data += avail; |
| len -= avail; |
| |
| while (len >= sizeof(mctx->block)) { |
| memcpy(mctx->block, data, sizeof(mctx->block)); |
| md5_transform_helper(mctx); |
| data += sizeof(mctx->block); |
| len -= sizeof(mctx->block); |
| } |
| |
| memcpy(mctx->block, data, len); |
| |
| return 0; |
| } |
| |
| static int 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); |
| |
| *p++ = 0x80; |
| if (padding < 0) { |
| memset(p, 0x00, padding + sizeof (u64)); |
| md5_transform_helper(mctx); |
| p = (char *)mctx->block; |
| padding = 56; |
| } |
| |
| memset(p, 0, padding); |
| mctx->block[14] = mctx->byte_count << 3; |
| mctx->block[15] = mctx->byte_count >> 29; |
| le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - |
| sizeof(u64)) / sizeof(u32)); |
| md5_transform(mctx->hash, mctx->block); |
| cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32)); |
| memcpy(out, mctx->hash, sizeof(mctx->hash)); |
| memset(mctx, 0, sizeof(*mctx)); |
| |
| return 0; |
| } |
| |
| static int 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 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 = md5_init, |
| .update = md5_update, |
| .final = md5_final, |
| .export = md5_export, |
| .import = md5_import, |
| .descsize = sizeof(struct md5_state), |
| .statesize = sizeof(struct md5_state), |
| .base = { |
| .cra_name = "md5", |
| .cra_driver_name = "md5-generic", |
| .cra_blocksize = MD5_HMAC_BLOCK_SIZE, |
| .cra_module = THIS_MODULE, |
| } |
| }; |
| |
| static int __init md5_mod_init(void) |
| { |
| return crypto_register_shash(&alg); |
| } |
| |
| static void __exit md5_mod_fini(void) |
| { |
| crypto_unregister_shash(&alg); |
| } |
| |
| subsys_initcall(md5_mod_init); |
| module_exit(md5_mod_fini); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); |
| MODULE_ALIAS_CRYPTO("md5"); |