EVP_CIPHER-AES - The AES EVP_CIPHER implementations
Support for AES symmetric encryption using the EVP_CIPHER API.
The following algorithms are available in the FIPS provider as well as the
default provider:
- "AES-128-CBC", "AES-192-CBC" and
"AES-256-CBC"
- "AES-128-CBC-CTS", "AES-192-CBC-CTS" and
"AES-256-CBC-CTS"
- "AES-128-CFB", "AES-192-CFB", "AES-256-CFB",
"AES-128-CFB1", "AES-192-CFB1",
"AES-256-CFB1", "AES-128-CFB8", "AES-192-CFB8"
and "AES-256-CFB8"
- "AES-128-CTR", "AES-192-CTR" and
"AES-256-CTR"
- "AES-128-ECB", "AES-192-ECB" and
"AES-256-ECB"
- "AES-192-OFB", "AES-128-OFB" and
"AES-256-OFB"
- "AES-128-XTS" and "AES-256-XTS"
- "AES-128-CCM", "AES-192-CCM" and
"AES-256-CCM"
- "AES-128-GCM", "AES-192-GCM" and
"AES-256-GCM"
- "AES-128-WRAP", "AES-192-WRAP",
"AES-256-WRAP", "AES-128-WRAP-PAD",
"AES-192-WRAP-PAD", "AES-256-WRAP-PAD",
"AES-128-WRAP-INV", "AES-192-WRAP-INV",
"AES-256-WRAP-INV", "AES-128-WRAP-PAD-INV",
"AES-192-WRAP-PAD-INV" and "AES-256-WRAP-PAD-INV"
- "AES-128-CBC-HMAC-SHA1", "AES-256-CBC-HMAC-SHA1",
"AES-128-CBC-HMAC-SHA256" and
"AES-256-CBC-HMAC-SHA256"
The following algorithms are available in the default provider,
but not the FIPS provider:
- "AES-128-OCB", "AES-192-OCB" and
"AES-256-OCB"
- "AES-128-SIV", "AES-192-SIV" and
"AES-256-SIV"
This implementation supports the parameters described in "PARAMETERS"
in EVP_EncryptInit(3).
The AES-SIV and AES-WRAP mode implementations do not support streaming. That
means to obtain correct results there can be only one
EVP_EncryptUpdate(3) or EVP_DecryptUpdate(3) call after the
initialization of the context.
When wrapping with AES-WRAP-PAD ciphers, the output buffer must be
at least inl rounded up to the cipher block size (8 bytes) plus the
block size. That is, the minimum output buffer size is
"((inl + 7) / 8) * 8 + 8" bytes.
The AES-XTS implementations allow streaming to be performed, but
each EVP_EncryptUpdate(3) or EVP_DecryptUpdate(3) call
requires each input to be a multiple of the blocksize. Only the final
EVP_EncryptUpdate() or EVP_DecryptUpdate() call can optionally
have an input that is not a multiple of the blocksize but is larger than one
block. In that case ciphertext stealing (CTS) is used to fill the block.
provider-cipher(7), OSSL_PROVIDER-FIPS(7),
OSSL_PROVIDER-default(7)
Copyright 2021-2026 The OpenSSL Project Authors. All Rights Reserved.
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
<https://www.openssl.org/source/license.html>.