1.. SPDX-License-Identifier: GPL-2.0-or-later 2 3Unauthenticated encryption 4========================== 5 6These APIs provide support for unauthenticated encryption and decryption, 7including bare stream ciphers and other length-preserving algorithms such as 8block ciphers in XTS mode. The legitimate use cases for these algorithms are: 9 10- Support for legacy protocols that really should have chosen an authenticated 11 mode (or even another primitive entirely) but didn't. 12 13- Internal components of authenticated modes. For example, AES-CTR is used by 14 AES-GCM and AES-CCM internally. 15 16- Storage encryption that cannot accommodate ciphertext expansion. Usually 17 AES-XTS is used for this. 18 19- Stream ciphers for key derivation and random number generation. 20 21Besides the above, these shouldn't be used. 22 23AES-ECB 24------- 25 26This API provides support for AES in the ECB mode of operation. 27 28.. kernel-doc:: include/crypto/aes-ecb.h 29