GCM Mode
GCM Mode
GCM Encryption
| BlockCipher cipher | the 128 bit block cipher to use |
| size_t tag_size | is how big the auth tag will be |
GCM Decryption
| BlockCipher cipher | the 128 bit block cipher to use |
| size_t tag_size | is how big the auth tag will be |
GCM's GHASH Maybe a Transform?