18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * MD5 hash implementation and interface functions 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 5c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 6c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * See README for more details. 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "includes.h" 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "common.h" 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "md5.h" 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "crypto.h" 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/** 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * hmac_md5_vector - HMAC-MD5 over data vector (RFC 2104) 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @key: Key for HMAC operations 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @key_len: Length of the key in bytes 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @num_elem: Number of elements in the data vector 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @addr: Pointers to the data areas 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @len: Lengths of the data blocks 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @mac: Buffer for the hash (16 bytes) 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Returns: 0 on success, -1 on failure 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem, 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *addr[], const size_t *len, u8 *mac) 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 k_pad[64]; /* padding - key XORd with ipad/opad */ 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 tk[16]; 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *_addr[6]; 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t i, _len[6]; 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (num_elem > 5) { 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Fixed limit on the number of fragments to avoid having to 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * allocate memory (which could fail). 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* if key is longer than 64 bytes reset it to key = MD5(key) */ 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (key_len > 64) { 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (md5_vector(1, &key, &key_len, tk)) 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt key = tk; 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt key_len = 16; 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* the HMAC_MD5 transform looks like: 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * MD5(K XOR opad, MD5(K XOR ipad, text)) 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * where K is an n byte key 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * ipad is the byte 0x36 repeated 64 times 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * opad is the byte 0x5c repeated 64 times 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * and text is the data being protected */ 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* start out by storing key in ipad */ 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(k_pad, 0, sizeof(k_pad)); 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(k_pad, key, key_len); 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* XOR key with ipad values */ 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (i = 0; i < 64; i++) 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt k_pad[i] ^= 0x36; 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* perform inner MD5 */ 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _addr[0] = k_pad; 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _len[0] = 64; 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (i = 0; i < num_elem; i++) { 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _addr[i + 1] = addr[i]; 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _len[i + 1] = len[i]; 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (md5_vector(1 + num_elem, _addr, _len, mac)) 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(k_pad, 0, sizeof(k_pad)); 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(k_pad, key, key_len); 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* XOR key with opad values */ 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (i = 0; i < 64; i++) 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt k_pad[i] ^= 0x5c; 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* perform outer MD5 */ 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _addr[0] = k_pad; 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _len[0] = 64; 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _addr[1] = mac; 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _len[1] = MD5_MAC_LEN; 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return md5_vector(2, _addr, _len, mac); 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/** 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * hmac_md5 - HMAC-MD5 over data buffer (RFC 2104) 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @key: Key for HMAC operations 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @key_len: Length of the key in bytes 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @data: Pointers to the data area 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @data_len: Length of the data area 988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * @mac: Buffer for the hash (16 bytes) 998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Returns: 0 on success, -1 on failure 1008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 1018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len, 1028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 *mac) 1038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac); 1058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 106