| 79 | // Key generation |
| 80 | template <class T> |
| 81 | void HMAC<T>::SetKey(const byte* key, word32 length) |
| 82 | { |
| 83 | Init(); |
| 84 | |
| 85 | if (length <= T::BLOCK_SIZE) |
| 86 | memcpy(ipad_, key, length); |
| 87 | else { |
| 88 | mac_.Update(key, length); |
| 89 | mac_.Final(ipad_); |
| 90 | length = T::DIGEST_SIZE; |
| 91 | } |
| 92 | memset(ipad_ + length, 0, T::BLOCK_SIZE - length); |
| 93 | |
| 94 | for (word32 i = 0; i < T::BLOCK_SIZE; i++) { |
| 95 | opad_[i] = ipad_[i] ^ OPAD; |
| 96 | ipad_[i] ^= IPAD; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | |
| 101 | // Inner Key Hash |