Cryptography and SSL/TLS Toolkit



EVP_CIPHER-AES - The AES EVP_CIPHER implementations


Support for AES symmetric encryption using the EVP_CIPHER API.

Algorithm Names

The following algorithms are available in the FIPS provider as well as the default provider:

"AES-128-CBC", "AES-192-CBC" and "AES-256-CBC"
"AES-128-CBC-CTS", "AES-192-CBC-CTS" and "AES-256-CBC-CTS"
"AES-128-CFB", "AES-192-CFB", "AES-256-CFB", "AES-128-CFB1", "AES-192-CFB1", "AES-256-CFB1", "AES-128-CFB8", "AES-192-CFB8" and "AES-256-CFB8"
"AES-128-CTR", "AES-192-CTR" and "AES-256-CTR"
"AES-128-ECB", "AES-192-ECB" and "AES-256-ECB"
"AES-192-OFB", "AES-128-OFB" and "AES-256-OFB"
"AES-128-XTS" and "AES-256-XTS"
"AES-128-CCM", "AES-192-CCM" and "AES-256-CCM"
"AES-128-GCM", "AES-192-GCM" and "AES-256-GCM"
"AES-128-WRAP", "AES-192-WRAP", "AES-256-WRAP", "AES-128-WRAP-PAD", "AES-192-WRAP-PAD", "AES-256-WRAP-PAD", "AES-128-WRAP-INV", "AES-192-WRAP-INV", "AES-256-WRAP-INV", "AES-128-WRAP-PAD-INV", "AES-192-WRAP-PAD-INV" and "AES-256-WRAP-PAD-INV"
"AES-128-CBC-HMAC-SHA1", "AES-256-CBC-HMAC-SHA1", "AES-128-CBC-HMAC-SHA256" and "AES-256-CBC-HMAC-SHA256"

The following algorithms are available in the default provider, but not the FIPS provider:

"AES-128-OCB", "AES-192-OCB" and "AES-256-OCB"
"AES-128-SIV", "AES-192-SIV" and "AES-256-SIV"


This implementation supports the parameters described in "PARAMETERS" in EVP_EncryptInit(3).


The AES-SIV and AES-WRAP mode implementations do not support streaming. That means to obtain correct results there can be only one EVP_EncryptUpdate(3) or EVP_DecryptUpdate(3) call after the initialization of the context.

The AES-XTS implementations allow streaming to be performed, but each EVP_EncryptUpdate(3) or EVP_DecryptUpdate(3) call requires each input to be a multiple of the blocksize. Only the final EVP_EncryptUpdate() or EVP_DecryptUpdate() call can optionally have an input that is not a multiple of the blocksize but is larger than one block. In that case ciphertext stealing (CTS) is used to fill the block.


provider-cipher(7), OSSL_PROVIDER-FIPS(7), OSSL_PROVIDER-default(7)

Copyright 2021-2022 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at