EVP_AES - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEEVP_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.
DESCRIPTIONThe 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_128_wrap(), EVP_aes_192_wrap(), EVP_aes_256_wrap(), EVP_aes_192_wrap_pad(), EVP_aes_128_wrap(), EVP_aes_192_wrap(), EVP_aes_256_wrap(), 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.
RETURN VALUESThese 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)
COPYRIGHTCopyright 2017−2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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>. 0
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