1=pod 2 3=head1 NAME 4 5EVP_CIPHER-NULL - The NULL EVP_CIPHER implementation 6 7=head1 DESCRIPTION 8 9Support for a NULL symmetric encryption using the B<EVP_CIPHER> API. 10This is used when the TLS cipher suite is TLS_NULL_WITH_NULL_NULL. 11This does no encryption (just copies the data) and has a mac size of zero. 12 13=head2 Algorithm Name 14 15The following algorithm is available in the default provider: 16 17=over 4 18 19=item "NULL" 20 21=back 22 23=head2 Parameters 24 25This implementation supports the following parameters: 26 27=head3 Gettable EVP_CIPHER parameters 28 29See L<EVP_EncryptInit(3)/Gettable EVP_CIPHER parameters> 30 31=head3 Gettable EVP_CIPHER_CTX parameters 32 33=over 4 34 35=item "keylen" (B<OSSL_CIPHER_PARAM_KEYLEN>) <unsigned integer> 36 37=item "ivlen" (B<OSSL_CIPHER_PARAM_IVLEN> and <B<OSSL_CIPHER_PARAM_AEAD_IVLEN>) <unsigned integer> 38 39=item "tls-mac" (B<OSSL_CIPHER_PARAM_TLS_MAC>) <octet ptr> 40 41=back 42 43See L<EVP_EncryptInit(3)/PARAMETERS> for further information. 44 45=head3 Settable EVP_CIPHER_CTX parameters 46 47=over 4 48 49=item "tls-mac-size" (B<OSSL_CIPHER_PARAM_TLS_MAC_SIZE>) <unsigned integer> 50 51=back 52 53See L<EVP_EncryptInit(3)/PARAMETERS> for further information. 54 55=head1 CONFORMING TO 56 57RFC 5246 section-6.2.3.1 58 59=head1 SEE ALSO 60 61L<provider-cipher(7)>, L<OSSL_PROVIDER-default(7)> 62 63=head1 COPYRIGHT 64 65Copyright 2023 The OpenSSL Project Authors. All Rights Reserved. 66 67Licensed under the Apache License 2.0 (the "License"). You may not use 68this file except in compliance with the License. You can obtain a copy 69in the file LICENSE in the source distribution or at 70L<https://www.openssl.org/source/license.html>. 71 72=cut 73