| /* |
| * MD5 hash implementation and interface functions (non-FIPS allowed cases) |
| * Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi> |
| * |
| * This software may be distributed under the terms of the BSD license. |
| * See README for more details. |
| */ |
| |
| #include "includes.h" |
| |
| #include "common.h" |
| #include "md5.h" |
| #include "crypto.h" |
| |
| |
| /** |
| * hmac_md5_vector_non_fips_allow - HMAC-MD5 over data vector (RFC 2104) |
| * @key: Key for HMAC operations |
| * @key_len: Length of the key in bytes |
| * @num_elem: Number of elements in the data vector |
| * @addr: Pointers to the data areas |
| * @len: Lengths of the data blocks |
| * @mac: Buffer for the hash (16 bytes) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int hmac_md5_vector_non_fips_allow(const u8 *key, size_t key_len, |
| size_t num_elem, const u8 *addr[], |
| const size_t *len, u8 *mac) |
| { |
| u8 k_pad[64]; /* padding - key XORd with ipad/opad */ |
| u8 tk[16]; |
| const u8 *_addr[6]; |
| size_t i, _len[6]; |
| |
| if (num_elem > 5) { |
| /* |
| * Fixed limit on the number of fragments to avoid having to |
| * allocate memory (which could fail). |
| */ |
| return -1; |
| } |
| |
| /* if key is longer than 64 bytes reset it to key = MD5(key) */ |
| if (key_len > 64) { |
| if (md5_vector_non_fips_allow(1, &key, &key_len, tk)) |
| return -1; |
| key = tk; |
| key_len = 16; |
| } |
| |
| /* the HMAC_MD5 transform looks like: |
| * |
| * MD5(K XOR opad, MD5(K XOR ipad, text)) |
| * |
| * where K is an n byte key |
| * ipad is the byte 0x36 repeated 64 times |
| * opad is the byte 0x5c repeated 64 times |
| * and text is the data being protected */ |
| |
| /* start out by storing key in ipad */ |
| os_memset(k_pad, 0, sizeof(k_pad)); |
| os_memcpy(k_pad, key, key_len); |
| |
| /* XOR key with ipad values */ |
| for (i = 0; i < 64; i++) |
| k_pad[i] ^= 0x36; |
| |
| /* perform inner MD5 */ |
| _addr[0] = k_pad; |
| _len[0] = 64; |
| for (i = 0; i < num_elem; i++) { |
| _addr[i + 1] = addr[i]; |
| _len[i + 1] = len[i]; |
| } |
| if (md5_vector_non_fips_allow(1 + num_elem, _addr, _len, mac)) |
| return -1; |
| |
| os_memset(k_pad, 0, sizeof(k_pad)); |
| os_memcpy(k_pad, key, key_len); |
| /* XOR key with opad values */ |
| for (i = 0; i < 64; i++) |
| k_pad[i] ^= 0x5c; |
| |
| /* perform outer MD5 */ |
| _addr[0] = k_pad; |
| _len[0] = 64; |
| _addr[1] = mac; |
| _len[1] = MD5_MAC_LEN; |
| return md5_vector_non_fips_allow(2, _addr, _len, mac); |
| } |
| |
| |
| /** |
| * hmac_md5_non_fips_allow - HMAC-MD5 over data buffer (RFC 2104) |
| * @key: Key for HMAC operations |
| * @key_len: Length of the key in bytes |
| * @data: Pointers to the data area |
| * @data_len: Length of the data area |
| * @mac: Buffer for the hash (16 bytes) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int hmac_md5_non_fips_allow(const u8 *key, size_t key_len, const u8 *data, |
| size_t data_len, u8 *mac) |
| { |
| return hmac_md5_vector_non_fips_allow(key, key_len, 1, &data, |
| &data_len, mac); |
| } |