| Hai Shalom | 74f70d4 | 2019-02-11 14:42:39 -0800 | [diff] [blame] | 1 | /* |
| 2 | * SHA-512 hash implementation and interface functions |
| 3 | * Copyright (c) 2003-2018, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 5 | * This software may be distributed under the terms of the BSD license. |
| 6 | * See README for more details. |
| 7 | */ |
| 8 | |
| 9 | #include "includes.h" |
| 10 | |
| 11 | #include "common.h" |
| 12 | #include "sha512.h" |
| 13 | #include "crypto.h" |
| 14 | |
| 15 | |
| 16 | /** |
| 17 | * hmac_sha512_vector - HMAC-SHA512 over data vector (RFC 2104) |
| 18 | * @key: Key for HMAC operations |
| 19 | * @key_len: Length of the key in bytes |
| 20 | * @num_elem: Number of elements in the data vector |
| 21 | * @addr: Pointers to the data areas |
| 22 | * @len: Lengths of the data blocks |
| 23 | * @mac: Buffer for the hash (64 bytes) |
| 24 | * Returns: 0 on success, -1 on failure |
| 25 | */ |
| 26 | int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem, |
| 27 | const u8 *addr[], const size_t *len, u8 *mac) |
| 28 | { |
| 29 | unsigned char k_pad[128]; /* padding - key XORd with ipad/opad */ |
| 30 | unsigned char tk[64]; |
| 31 | const u8 *_addr[6]; |
| 32 | size_t _len[6], i; |
| 33 | |
| 34 | if (num_elem > 5) { |
| 35 | /* |
| 36 | * Fixed limit on the number of fragments to avoid having to |
| 37 | * allocate memory (which could fail). |
| 38 | */ |
| 39 | return -1; |
| 40 | } |
| 41 | |
| 42 | /* if key is longer than 128 bytes reset it to key = SHA512(key) */ |
| 43 | if (key_len > 128) { |
| 44 | if (sha512_vector(1, &key, &key_len, tk) < 0) |
| 45 | return -1; |
| 46 | key = tk; |
| 47 | key_len = 64; |
| 48 | } |
| 49 | |
| 50 | /* the HMAC_SHA512 transform looks like: |
| 51 | * |
| 52 | * SHA512(K XOR opad, SHA512(K XOR ipad, text)) |
| 53 | * |
| 54 | * where K is an n byte key |
| 55 | * ipad is the byte 0x36 repeated 128 times |
| 56 | * opad is the byte 0x5c repeated 128 times |
| 57 | * and text is the data being protected */ |
| 58 | |
| 59 | /* start out by storing key in ipad */ |
| 60 | os_memset(k_pad, 0, sizeof(k_pad)); |
| 61 | os_memcpy(k_pad, key, key_len); |
| 62 | /* XOR key with ipad values */ |
| 63 | for (i = 0; i < 128; i++) |
| 64 | k_pad[i] ^= 0x36; |
| 65 | |
| 66 | /* perform inner SHA512 */ |
| 67 | _addr[0] = k_pad; |
| 68 | _len[0] = 128; |
| 69 | for (i = 0; i < num_elem; i++) { |
| 70 | _addr[i + 1] = addr[i]; |
| 71 | _len[i + 1] = len[i]; |
| 72 | } |
| 73 | if (sha512_vector(1 + num_elem, _addr, _len, mac) < 0) |
| 74 | return -1; |
| 75 | |
| 76 | os_memset(k_pad, 0, sizeof(k_pad)); |
| 77 | os_memcpy(k_pad, key, key_len); |
| 78 | /* XOR key with opad values */ |
| 79 | for (i = 0; i < 128; i++) |
| 80 | k_pad[i] ^= 0x5c; |
| 81 | |
| 82 | /* perform outer SHA512 */ |
| 83 | _addr[0] = k_pad; |
| 84 | _len[0] = 128; |
| 85 | _addr[1] = mac; |
| 86 | _len[1] = SHA512_MAC_LEN; |
| 87 | return sha512_vector(2, _addr, _len, mac); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | /** |
| 92 | * hmac_sha512 - HMAC-SHA512 over data buffer (RFC 2104) |
| 93 | * @key: Key for HMAC operations |
| 94 | * @key_len: Length of the key in bytes |
| 95 | * @data: Pointers to the data area |
| 96 | * @data_len: Length of the data area |
| 97 | * @mac: Buffer for the hash (64 bytes) |
| 98 | * Returns: 0 on success, -1 on failure |
| 99 | */ |
| 100 | int hmac_sha512(const u8 *key, size_t key_len, const u8 *data, |
| 101 | size_t data_len, u8 *mac) |
| 102 | { |
| 103 | return hmac_sha512_vector(key, key_len, 1, &data, &data_len, mac); |
| 104 | } |