OpenBSD manual page server

NAME

EVP_aes_128_cbc, EVP_aes_192_cbc, EVP_aes_256_cbc, 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_cfb, EVP_aes_192_cfb, EVP_aes_256_cfb, 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_ccm, EVP_aes_192_ccm, EVP_aes_256_ccm, EVP_aes_128_gcm, EVP_aes_192_gcm, EVP_aes_256_gcm, EVP_aes_128_wrap, EVP_aes_192_wrap, EVP_aes_256_wrap, EVP_aes_128_xts, EVP_aes_256_xts — EVP AES cipher

SYNOPSIS

#include <openssl/evp.h>

const EVP_CIPHER *
EVP_aes_128_cbc(void);

const EVP_CIPHER *
EVP_aes_192_cbc(void);

const EVP_CIPHER *
EVP_aes_256_cbc(void);

const EVP_CIPHER *
EVP_aes_128_cfb1(void);

const EVP_CIPHER *
EVP_aes_192_cfb1(void);

const EVP_CIPHER *
EVP_aes_256_cfb1(void);

const EVP_CIPHER *
EVP_aes_128_cfb8(void);

const EVP_CIPHER *
EVP_aes_192_cfb8(void);

const EVP_CIPHER *
EVP_aes_256_cfb8(void);

const EVP_CIPHER *
EVP_aes_128_cfb128(void);

const EVP_CIPHER *
EVP_aes_192_cfb128(void);

const EVP_CIPHER *
EVP_aes_256_cfb128(void);

const EVP_CIPHER *
EVP_aes_128_cfb(void);

const EVP_CIPHER *
EVP_aes_192_cfb(void);

const EVP_CIPHER *
EVP_aes_256_cfb(void);

const EVP_CIPHER *
EVP_aes_128_ctr(void);

const EVP_CIPHER *
EVP_aes_192_ctr(void);

const EVP_CIPHER *
EVP_aes_256_ctr(void);

const EVP_CIPHER *
EVP_aes_128_ecb(void);

const EVP_CIPHER *
EVP_aes_192_ecb(void);

const EVP_CIPHER *
EVP_aes_256_ecb(void);

const EVP_CIPHER *
EVP_aes_128_ofb(void);

const EVP_CIPHER *
EVP_aes_192_ofb(void);

const EVP_CIPHER *
EVP_aes_256_ofb(void);

const EVP_CIPHER *
EVP_aes_128_cbc_hmac_sha1(void);

const EVP_CIPHER *
EVP_aes_256_cbc_hmac_sha1(void);

const EVP_CIPHER *
EVP_aes_128_ccm(void);

const EVP_CIPHER *
EVP_aes_192_ccm(void);

const EVP_CIPHER *
EVP_aes_256_ccm(void);

const EVP_CIPHER *
EVP_aes_128_gcm(void);

const EVP_CIPHER *
EVP_aes_192_gcm(void);

const EVP_CIPHER *
EVP_aes_256_gcm(void);

const EVP_CIPHER *
EVP_aes_128_wrap(void);

const EVP_CIPHER *
EVP_aes_192_wrap(void);

const EVP_CIPHER *
EVP_aes_256_wrap(void);

const EVP_CIPHER *
EVP_aes_128_xts(void);

const EVP_CIPHER *
EVP_aes_256_xts(void);

DESCRIPTION

These functions provide the AES encryption algorithm in the evp(3) framework.

EVP_aes_128_cbc(), EVP_aes_192_cbc(), EVP_aes_256_cbc(), 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(), and EVP_aes_256_ofb() provide AES for 128, 192, and 256 bit keys in the following modes: CBC, CFB with 1-bit shift, CFB with 8-bit shift, CFB with 128-bit shift, CTR, ECB, and OFB.

EVP_aes_128_cfb(), EVP_aes_192_cfb(), and EVP_aes_256_cfb() are aliases for EVP_aes_128_cfb128(), EVP_aes_192_cfb128(), and EVP_aes_256_cfb128().

EVP_aes_128_cbc_hmac_sha1() and EVP_aes_256_cbc_hmac_sha1() provide 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. This is not intended for usage outside of TLS and requires calling of some undocumented control 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(), and EVP_aes_256_gcm() provide AES for 128, 192 and 256 bit keys in CBC-MAC Mode (CCM) and Galois Counter Mode (GCM), respectively. These ciphers require additional control operations to function correctly; see EVP_EncryptInit(3) for details.

EVP_aes_128_wrap(), EVP_aes_192_wrap(), and EVP_aes_256_wrap() provide AES key wrap with 128, 192 and 256 bit keys according to RFC 3394 section 2.2.1 ("wrap"). When the returned EVP_CIPHER object is later passed to EVP_CipherInit_ex(3), EVP_EncryptInit_ex(3), or EVP_DecryptInit_ex(3) together with an EVP_CIPHER_CTX object, the flag EVP_CIPHER_CTX_FLAG_WRAP_ALLOW must have been set in the EVP_CIPHER_CTX using EVP_CIPHER_CTX_set_flags(3). Otherwise, or when passing the returned EVP_CIPHER object to EVP_CipherInit(3), EVP_EncryptInit(3), or EVP_DecryptInit(3), initialization fails with a “wrap not allowed” error.

EVP_aes_128_xts() and EVP_aes_256_xts() provide XEX-based tweaked-codebook mode with ciphertext stealing (XTS-AES) as specified in IEEE Std. 1619-2007 and described in NIST SP 800-38E. It was designed for encrypting data on a storage device, provides confidentiality but not authentication of data, and requires a key of double length for protection of a certain key size. In particular, XTS-AES-128 takes input of a 256-bit key to achieve AES 128-bit security, and XTS-AES-256 takes input of a 512-bit key to achieve AES 256-bit security.

RETURN VALUES

These functions return an EVP_CIPHER structure that provides the implementation of the symmetric cipher.

SEE ALSO

AES_encrypt(3), evp(3), EVP_EncryptInit(3)

HISTORY

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_ebc(), EVP_aes_192_ebc(), EVP_aes_256_ebc(), EVP_aes_128_ofb(), EVP_aes_192_ofb(), and EVP_aes_256_ofb() first appeared in OpenSSL 0.9.7 and have been available since OpenBSD 3.2.

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(), and EVP_aes_256_cfb128() first appeared in OpenSSL 0.9.7e and have been available since OpenBSD 3.8.

EVP_aes_128_ctr(), EVP_aes_192_ctr(), EVP_aes_256_ctr(), EVP_aes_128_cbc_hmac_sha1(), EVP_aes_256_cbc_hmac_sha1(), 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_xts(), and EVP_aes_256_xts() first appeared in OpenSSL 1.0.1 and have been available since OpenBSD 5.3.

EVP_aes_128_wrap(), EVP_aes_192_wrap(), and EVP_aes_256_wrap() first appeared in OpenSSL 1.0.2 and have been available since OpenBSD 6.5.