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Title "EVP_AES_128_GCM 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #include <openssl/evp.h> \& const EVP_CIPHER *EVP_ciphername(void) .Ve

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

Header "DESCRIPTION" The \s-1AES\s0 encryption algorithm for \s-1EVP.\s0 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 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. 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. 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 EVP_EncryptInit\|(3) section for details. 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. 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 (EVP_aes_128_xts) takes input of a 256-bit key to achieve \s-1AES\s0 128-bit security, and \s-1XTS-AES-256\s0 (EVP_aes_256_xts) 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 EVP_EncryptUpdate\|(3) call per EVP_EncryptInit_ex\|(3) call (and similarly with the \*(L"Decrypt\*(R" functions). .Sp The iv parameter to EVP_EncryptInit_ex\|(3) or EVP_DecryptInit_ex\|(3) is the \s-1XTS\s0 \*(L"tweak\*(R" value. Header "NOTES" Developers should be aware of the negative performance implications of calling these functions multiple times and should consider using \fBEVP_CIPHER_fetch\|(3) instead. See \*(L"Performance\*(R" in crypto\|(7) for further information. Header "RETURN VALUES" These functions return an \s-1EVP_CIPHER\s0 structure that contains the implementation of the symmetric cipher. See EVP_CIPHER_meth_new\|(3) for details of the \s-1EVP_CIPHER\s0 structure. Header "SEE ALSO" \fBevp\|(7), \fBEVP_EncryptInit\|(3), \fBEVP_CIPHER_meth_new\|(3) Header "COPYRIGHT" Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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>.