We support XTS-AES128 and XTS-AES256 modes in this implementation.
Attention
The bit-width of the interfaces we provide is shown as follows:
| plaintext | ciphertext | cipherkey | IV | textlength | |
| CBC-AES128 | 128 | 128 | 128 | 128 | 64 |
| CBC-AES256 | 128 | 128 | 256 | 128 | 64 |
The algorithm flow chart is shown as follow:
As we can see from the chart, the dependency of XTS encryption flow only exists between the first block and the second to last block. It is same as shown in XTS decryption flow. Therefore, the initiation interval (II) of XTS encryption and decryption mode can achieve 1. Notice that one one-word AES encryption module is instanced in XTS decryption.