EVP_CIPHER-NULL - The NULL EVP_CIPHER implementation

RFC 5246 section-6.2.3.1

Copyright 2023 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>. 3.5.0 2025-06-04 EVP_CIPHER-NULL(7SSL)

Support for a NULL symmetric encryption using the EVP_CIPHER API. This is used when the TLS cipher suite is TLS_NULL_WITH_NULL_NULL. This does no encryption (just copies the data) and has a mac size of zero. AlgorithmName The following algorithm is available in the default provider: "NULL" Parameters This implementation supports the following parameters: GettableEVP_CIPHERparameters See "Gettable EVP_CIPHER parameters" in EVP_EncryptInit(3) GettableEVP_CIPHER_CTXparameters "keylen" (OSSL_CIPHER_PARAM_KEYLEN) <unsigned integer> "ivlen" (OSSL_CIPHER_PARAM_IVLEN and <OSSL_CIPHER_PARAM_AEAD_IVLEN) <unsigned integer> "tls-mac" (OSSL_CIPHER_PARAM_TLS_MAC) <octet ptr> See "PARAMETERS" in EVP_EncryptInit(3) for further information. SettableEVP_CIPHER_CTXparameters "tls-mac-size" (OSSL_CIPHER_PARAM_TLS_MAC_SIZE) <unsigned integer> See "PARAMETERS" in EVP_EncryptInit(3) for further information.

EVP_CIPHER-NULL - The NULL EVP_CIPHER implementation

provider-cipher(7), OSSL_PROVIDER-default(7)