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Edit File : EVP_aes_256_cfb1.3 \| Size : 10.75 KB
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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 <openssl/evp.h> \& \& 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 \s-1AES\s0 encryption algorithm for \s-1EVP.\s0 .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()" \&\s-1AES\s0 for 128, 192 and 256 bit keys in the following modes: \s-1CBC, CFB\s0 with 128\-bit shift, \s-1CFB\s0 with 1\-bit shift, \s-1CFB\s0 with 8\-bit shift, \s-1CTR, ECB,\s0 and \s-1OFB.\s0 .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 \s-1AES\s0 in \s-1CBC\s0 mode using \s-1SHA\-1\s0 as \s-1HMAC,\s0 with keys of 128 and 256 bits length respectively. The authentication tag is 160 bits long. .Sp \&\s-1WARNING:\s0 this is not intended for usage outside of \s-1TLS\s0 and requires calling of some undocumented ctrl functions. These ciphers do not conform to the \s-1EVP AEAD\s0 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 \s-1AES\s0 in \s-1CBC\s0 mode using \s-1SHA256\s0 (\s-1SHA\-2,\s0 256\-bits) as \&\s-1HMAC,\s0 with keys of 128 and 256 bits length respectively. The authentication tag is 256 bits long. .Sp \&\s-1WARNING:\s0 this is not intended for usage outside of \s-1TLS\s0 and requires calling of some undocumented ctrl functions. These ciphers do not conform to the \s-1EVP AEAD\s0 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()" \&\s-1AES\s0 for 128, 192 and 256 bit keys in CBC-MAC Mode (\s-1CCM\s0), Galois Counter Mode (\s-1GCM\s0) and \s-1OCB\s0 Mode respectively. These ciphers require additional control operations to function correctly, see the \(L"\s-1AEAD\s0 Interface\(R" 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_128_wrap()\fR, \fBEVP_aes_192_wrap()\fR, \fBEVP_aes_256_wrap()\fR, \fBEVP_aes_192_wrap_pad()\fR, \fBEVP_aes_128_wrap()\fR, \fBEVP_aes_192_wrap()\fR, \fBEVP_aes_256_wrap()\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_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()" \&\s-1AES\s0 key wrap with 128, 192 and 256 bit keys, as according to \s-1RFC 3394\s0 section 2.2.1 (\(L"wrap\(R") and \s-1RFC 5649\s0 section 4.1 (\(L"wrap with padding\(R") respectively. .IP "\fBEVP_aes_128_xts()\fR, \fBEVP_aes_256_xts()\fR" 4 .IX Item "EVP_aes_128_xts(), EVP_aes_256_xts()" \&\s-1AES XTS\s0 mode (XTS-AES) is standardized in \s-1IEEE\s0 Std. 1619\-2007 and described in \s-1NIST SP 800\-38E.\s0 The \s-1XTS\s0 (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, \s-1XTS\-AES\-128\s0 (\fBEVP_aes_128_xts\fR) takes input of a 256\-bit key to achieve \s-1AES\s0 128\-bit security, and \s-1XTS\-AES\-256\s0 (\fBEVP_aes_256_xts\fR) takes input of a 512\-bit key to achieve \s-1AES\s0 256\-bit security. .Sp The \s-1XTS\s0 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 \(L"Decrypt\(R" functions). .Sp The \fIiv\fR parameter to \fBEVP_EncryptInit_ex\fR\\|(3) or \fBEVP_DecryptInit_ex\fR\\|(3) is the \s-1XTS\s0 \(L"tweak\(R" value. .SH "RETURN VALUES" .IX Header "RETURN VALUES" These functions return an \fB\s-1EVP_CIPHER\s0\fR structure that contains the implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\\|(3) for details of the \fB\s-1EVP_CIPHER\s0\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\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

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.\" ========================================================================
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.IX Title "EVP_AES 3"
.TH EVP_AES 3 "2023-09-11" "1.1.1w" "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 <openssl/evp.h>
\&
\& 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 \s-1AES\s0 encryption algorithm for \s-1EVP.\s0
.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()"
\&\s-1AES\s0 for 128, 192 and 256 bit keys in the following modes: \s-1CBC, CFB\s0 with 128\-bit
shift, \s-1CFB\s0 with 1\-bit shift, \s-1CFB\s0 with 8\-bit shift, \s-1CTR, ECB,\s0 and \s-1OFB.\s0
.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 \s-1AES\s0 in \s-1CBC\s0 mode using \s-1SHA\-1\s0 as \s-1HMAC,\s0 with keys of
128 and 256 bits length respectively. The authentication tag is 160 bits long.
.Sp
\&\s-1WARNING:\s0 this is not intended for usage outside of \s-1TLS\s0 and requires calling of
some undocumented ctrl functions. These ciphers do not conform to the \s-1EVP AEAD\s0
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 \s-1AES\s0 in \s-1CBC\s0 mode using \s-1SHA256\s0 (\s-1SHA\-2,\s0 256\-bits) as
\&\s-1HMAC,\s0 with keys of 128 and 256 bits length respectively. The authentication tag
is 256 bits long.
.Sp
\&\s-1WARNING:\s0 this is not intended for usage outside of \s-1TLS\s0 and requires calling of
some undocumented ctrl functions. These ciphers do not conform to the \s-1EVP AEAD\s0
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()"
\&\s-1AES\s0 for 128, 192 and 256 bit keys in CBC-MAC Mode (\s-1CCM\s0), Galois Counter Mode
(\s-1GCM\s0) and \s-1OCB\s0 Mode respectively. These ciphers require additional control
operations to function correctly, see the \*(L"\s-1AEAD\s0 Interface\*(R" 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_128_wrap()\fR, \fBEVP_aes_192_wrap()\fR, \fBEVP_aes_256_wrap()\fR, \fBEVP_aes_192_wrap_pad()\fR, \fBEVP_aes_128_wrap()\fR, \fBEVP_aes_192_wrap()\fR, \fBEVP_aes_256_wrap()\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_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()"
\&\s-1AES\s0 key wrap with 128, 192 and 256 bit keys, as according to \s-1RFC 3394\s0 section
2.2.1 (\*(L"wrap\*(R") and \s-1RFC 5649\s0 section 4.1 (\*(L"wrap with padding\*(R") respectively.
.IP "\fBEVP_aes_128_xts()\fR, \fBEVP_aes_256_xts()\fR" 4
.IX Item "EVP_aes_128_xts(), EVP_aes_256_xts()"
\&\s-1AES XTS\s0 mode (XTS-AES) is standardized in \s-1IEEE\s0 Std. 1619\-2007 and described in \s-1NIST
SP 800\-38E.\s0 The \s-1XTS\s0 (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, \s-1XTS\-AES\-128\s0 (\fBEVP_aes_128_xts\fR) takes input of a 256\-bit key to
achieve \s-1AES\s0 128\-bit security, and \s-1XTS\-AES\-256\s0 (\fBEVP_aes_256_xts\fR) takes input
of a 512\-bit key to achieve \s-1AES\s0 256\-bit security.
.Sp
The \s-1XTS\s0 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 \*(L"Decrypt\*(R" functions).
.Sp
The \fIiv\fR parameter to \fBEVP_EncryptInit_ex\fR\|(3) or \fBEVP_DecryptInit_ex\fR\|(3) is
the \s-1XTS\s0 \*(L"tweak\*(R" value.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return an \fB\s-1EVP_CIPHER\s0\fR structure that contains the
implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\|(3) for
details of the \fB\s-1EVP_CIPHER\s0\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\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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