.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "EVP_AES_128_GCM 3SSL" .TH EVP_AES_128_GCM 3SSL 2024-04-11 3.3.0 OpenSSL .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH 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 .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& const EVP_CIPHER *EVP_ciphername(void) .Ve .PP \&\fIEVP_ciphername\fR is used a placeholder for any of the described cipher functions, such as \fIEVP_aes_128_cbc\fR. .SH DESCRIPTION .IX Header "DESCRIPTION" The AES encryption algorithm for EVP. .IP "\fBEVP_aes_128_cbc()\fR, \fBEVP_aes_192_cbc()\fR, \fBEVP_aes_256_cbc()\fR, \fBEVP_aes_128_cfb()\fR, \fBEVP_aes_192_cfb()\fR, \fBEVP_aes_256_cfb()\fR, \fBEVP_aes_128_cfb1()\fR, \fBEVP_aes_192_cfb1()\fR, \fBEVP_aes_256_cfb1()\fR, \fBEVP_aes_128_cfb8()\fR, \fBEVP_aes_192_cfb8()\fR, \fBEVP_aes_256_cfb8()\fR, \fBEVP_aes_128_cfb128()\fR, \fBEVP_aes_192_cfb128()\fR, \fBEVP_aes_256_cfb128()\fR, \fBEVP_aes_128_ctr()\fR, \fBEVP_aes_192_ctr()\fR, \fBEVP_aes_256_ctr()\fR, \fBEVP_aes_128_ecb()\fR, \fBEVP_aes_192_ecb()\fR, \fBEVP_aes_256_ecb()\fR, \fBEVP_aes_128_ofb()\fR, \fBEVP_aes_192_ofb()\fR, \fBEVP_aes_256_ofb()\fR" 4 .IX Item "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. .IP "\fBEVP_aes_128_cbc_hmac_sha1()\fR, \fBEVP_aes_256_cbc_hmac_sha1()\fR" 4 .IX Item "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. .Sp 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. .IP "\fBEVP_aes_128_cbc_hmac_sha256()\fR, \fBEVP_aes_256_cbc_hmac_sha256()\fR" 4 .IX Item "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. .Sp 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. .IP "\fBEVP_aes_128_ccm()\fR, \fBEVP_aes_192_ccm()\fR, \fBEVP_aes_256_ccm()\fR, \fBEVP_aes_128_gcm()\fR, \fBEVP_aes_192_gcm()\fR, \fBEVP_aes_256_gcm()\fR, \fBEVP_aes_128_ocb()\fR, \fBEVP_aes_192_ocb()\fR, \fBEVP_aes_256_ocb()\fR" 4 .IX Item "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 \fBEVP_EncryptInit\fR\|(3) section for details. .IP "\fBEVP_aes_128_wrap()\fR, \fBEVP_aes_192_wrap()\fR, \fBEVP_aes_256_wrap()\fR, \fBEVP_aes_128_wrap_pad()\fR, \fBEVP_aes_192_wrap_pad()\fR, \fBEVP_aes_256_wrap_pad()\fR" 4 .IX Item "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. .IP "\fBEVP_aes_128_xts()\fR, \fBEVP_aes_256_xts()\fR" 4 .IX Item "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. .Sp 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 (\fBEVP_aes_128_xts\fR) takes input of a 256\-bit key to achieve AES 128\-bit security, and XTS\-AES\-256 (\fBEVP_aes_256_xts\fR) takes input of a 512\-bit key to achieve AES 256\-bit security. .Sp The XTS implementation in OpenSSL does not support streaming. That is there must only be one \fBEVP_EncryptUpdate\fR\|(3) call per \fBEVP_EncryptInit_ex\fR\|(3) call (and similarly with the "Decrypt" functions). .Sp The \fIiv\fR parameter to \fBEVP_EncryptInit_ex\fR\|(3) or \fBEVP_DecryptInit_ex\fR\|(3) is the XTS "tweak" value. .SH NOTES .IX Header "NOTES" Developers should be aware of the negative performance implications of calling these functions multiple times and should consider using \&\fBEVP_CIPHER_fetch\fR\|(3) with \fBEVP_CIPHER\-AES\fR\|(7) instead. See "Performance" in \fBcrypto\fR\|(7) for further information. .SH "RETURN VALUES" .IX Header "RETURN VALUES" These functions return an \fBEVP_CIPHER\fR structure that contains the implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\|(3) for details of the \fBEVP_CIPHER\fR structure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBevp\fR\|(7), \&\fBEVP_EncryptInit\fR\|(3), \&\fBEVP_CIPHER_meth_new\fR\|(3) .SH COPYRIGHT .IX Header "COPYRIGHT" Copyright 2017\-2023 The OpenSSL Project Authors. All Rights Reserved. .PP 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 .