← Back
Editing: EVP_aes_128_xts.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" 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 .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . 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 .\" .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). .\" Fear. Run. Save yourself. No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .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>.
Save File
Cancel