NAME

       EVP_aes_128_cbc, EVP_aes_192_cbc, EVP_aes_256_cbc, EVP_aes_128_cfb, EVP_aes_192_cfb,
       EVP_aes_256_cfb, EVP_aes_128_cfb1, EVP_aes_192_cfb1, EVP_aes_256_cfb1, EVP_aes_128_cfb8,
       EVP_aes_192_cfb8, EVP_aes_256_cfb8, EVP_aes_128_cfb128, EVP_aes_192_cfb128,
       EVP_aes_256_cfb128, EVP_aes_128_ctr, EVP_aes_192_ctr, EVP_aes_256_ctr, EVP_aes_128_ecb,
       EVP_aes_192_ecb, EVP_aes_256_ecb, EVP_aes_128_ofb, EVP_aes_192_ofb, EVP_aes_256_ofb,
       EVP_aes_128_cbc_hmac_sha1, EVP_aes_256_cbc_hmac_sha1, EVP_aes_128_cbc_hmac_sha256,
       EVP_aes_256_cbc_hmac_sha256, EVP_aes_128_ccm, EVP_aes_192_ccm, EVP_aes_256_ccm,
       EVP_aes_128_gcm, EVP_aes_192_gcm, EVP_aes_256_gcm, EVP_aes_128_ocb, EVP_aes_192_ocb,
       EVP_aes_256_ocb, EVP_aes_128_wrap, EVP_aes_192_wrap, EVP_aes_256_wrap,
       EVP_aes_128_wrap_pad, EVP_aes_192_wrap_pad, EVP_aes_256_wrap_pad, EVP_aes_128_xts,
       EVP_aes_256_xts - EVP AES cipher

SYNOPSIS

        #include <openssl/evp.h>

        const EVP_CIPHER *EVP_ciphername(void)

       EVP_ciphername is used a placeholder for any of the described cipher functions, such as
       EVP_aes_128_cbc.

DESCRIPTION

       The AES encryption algorithm for EVP.

       EVP_aes_128_cbc(), EVP_aes_192_cbc(), EVP_aes_256_cbc(), EVP_aes_128_cfb(),
       EVP_aes_192_cfb(), EVP_aes_256_cfb(), EVP_aes_128_cfb1(), EVP_aes_192_cfb1(),
       EVP_aes_256_cfb1(), EVP_aes_128_cfb8(), EVP_aes_192_cfb8(), EVP_aes_256_cfb8(),
       EVP_aes_128_cfb128(), EVP_aes_192_cfb128(), EVP_aes_256_cfb128(), EVP_aes_128_ctr(),
       EVP_aes_192_ctr(), EVP_aes_256_ctr(), EVP_aes_128_ecb(), EVP_aes_192_ecb(),
       EVP_aes_256_ecb(), EVP_aes_128_ofb(), EVP_aes_192_ofb(), EVP_aes_256_ofb()
           AES for 128, 192 and 256 bit keys in the following modes: CBC, CFB with 128-bit shift,
           CFB with 1-bit shift, CFB with 8-bit shift, CTR, ECB, and OFB.

       EVP_aes_128_cbc_hmac_sha1(), EVP_aes_256_cbc_hmac_sha1()
           Authenticated encryption with AES in CBC mode using SHA-1 as HMAC, with keys of 128
           and 256 bits length respectively. The authentication tag is 160 bits long.

           WARNING: this is not intended for usage outside of TLS and requires calling of some
           undocumented ctrl functions. These ciphers do not conform to the EVP AEAD interface.

       EVP_aes_128_cbc_hmac_sha256(), EVP_aes_256_cbc_hmac_sha256()
           Authenticated encryption with AES in CBC mode using SHA256 (SHA-2, 256-bits) as HMAC,
           with keys of 128 and 256 bits length respectively. The authentication tag is 256 bits
           long.

           WARNING: this is not intended for usage outside of TLS and requires calling of some
           undocumented ctrl functions. These ciphers do not conform to the EVP AEAD interface.

       EVP_aes_128_ccm(), EVP_aes_192_ccm(), EVP_aes_256_ccm(), EVP_aes_128_gcm(),
       EVP_aes_192_gcm(), EVP_aes_256_gcm(), EVP_aes_128_ocb(), EVP_aes_192_ocb(),
       EVP_aes_256_ocb()
           AES for 128, 192 and 256 bit keys in CBC-MAC Mode (CCM), Galois Counter Mode (GCM) and
           OCB Mode respectively. These ciphers require additional control operations to function
           correctly, see the "AEAD Interface" in EVP_EncryptInit(3) section for details.

       EVP_aes_128_wrap(), EVP_aes_192_wrap(), EVP_aes_256_wrap(), EVP_aes_128_wrap_pad(),
       EVP_aes_192_wrap_pad(), EVP_aes_256_wrap_pad()
           AES key wrap with 128, 192 and 256 bit keys, as according to RFC 3394 section 2.2.1
           ("wrap") and RFC 5649 section 4.1 ("wrap with padding") respectively.

       EVP_aes_128_xts(), EVP_aes_256_xts()
           AES XTS mode (XTS-AES) is standardized in IEEE Std. 1619-2007 and described in NIST SP
           800-38E. The XTS (XEX-based tweaked-codebook mode with ciphertext stealing) mode was
           designed by Prof. Phillip Rogaway of University of California, Davis, intended for
           encrypting data on a storage device.

           XTS-AES provides confidentiality but not authentication of data. It also requires a
           key of double-length for protection of a certain key size.  In particular, XTS-AES-128
           (EVP_aes_128_xts) takes input of a 256-bit key to achieve AES 128-bit security, and
           XTS-AES-256 (EVP_aes_256_xts) takes input of a 512-bit key to achieve AES 256-bit
           security.

           The XTS implementation in OpenSSL does not support streaming. That is there must only
           be one EVP_EncryptUpdate(3) call per EVP_EncryptInit_ex(3) call (and similarly with
           the "Decrypt" functions).

           The iv parameter to EVP_EncryptInit_ex(3) or EVP_DecryptInit_ex(3) is the XTS "tweak"
           value.

NOTES

       Developers should be aware of the negative performance implications of calling these
       functions multiple times and should consider using EVP_CIPHER_fetch(3) with
       EVP_CIPHER-AES(7) instead.  See "Performance" in crypto(7) for further information.

RETURN VALUES

       These functions return an EVP_CIPHER structure that contains the implementation of the
       symmetric cipher. See EVP_CIPHER_meth_new(3) for details of the EVP_CIPHER structure.

SEE ALSO

       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)

COPYRIGHT

       Copyright 2017-2023 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 <https://www.openssl.org/source/license.html>.