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=pod
=head1 NAME
EVP_CIPHER-NULL - The NULL EVP_CIPHER implementation
=head1 DESCRIPTION
Support for a NULL symmetric encryption using the B<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.
=head2 Algorithm Name
The following algorithm is available in the default provider:
=over 4
=item "NULL"
=back
=head2 Parameters
This implementation supports the following parameters:
=head3 Gettable EVP_CIPHER parameters
See L<EVP_EncryptInit(3)/Gettable EVP_CIPHER parameters>
=head3 Gettable EVP_CIPHER_CTX parameters
=over 4
=item "keylen" (B<OSSL_CIPHER_PARAM_KEYLEN>) <unsigned integer>
=item "ivlen" (B<OSSL_CIPHER_PARAM_IVLEN> and <B<OSSL_CIPHER_PARAM_AEAD_IVLEN>) <unsigned integer>
=item "tls-mac" (B<OSSL_CIPHER_PARAM_TLS_MAC>) <octet ptr>
=back
See L<EVP_EncryptInit(3)/PARAMETERS> for further information.
=head3 Settable EVP_CIPHER_CTX parameters
=over 4
=item "tls-mac-size" (B<OSSL_CIPHER_PARAM_TLS_MAC_SIZE>) <unsigned integer>
=back
See L<EVP_EncryptInit(3)/PARAMETERS> for further information.
=head1 CONFORMING TO
RFC 5246 section-6.2.3.1
=head1 SEE ALSO
L<provider-cipher(7)>, L<OSSL_PROVIDER-default(7)>
=head1 COPYRIGHT
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
L<https://www.openssl.org/source/license.html>.
=cut
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