1=pod 2 3=head1 NAME 4 5EVP_rc5_32_12_16_cbc, 6EVP_rc5_32_12_16_cfb, 7EVP_rc5_32_12_16_cfb64, 8EVP_rc5_32_12_16_ecb, 9EVP_rc5_32_12_16_ofb 10- EVP RC5 cipher 11 12=head1 SYNOPSIS 13 14 #include <openssl/evp.h> 15 16 const EVP_CIPHER *EVP_rc5_32_12_16_cbc(void); 17 const EVP_CIPHER *EVP_rc5_32_12_16_cfb(void); 18 const EVP_CIPHER *EVP_rc5_32_12_16_cfb64(void); 19 const EVP_CIPHER *EVP_rc5_32_12_16_ecb(void); 20 const EVP_CIPHER *EVP_rc5_32_12_16_ofb(void); 21 22=head1 DESCRIPTION 23 24The RC5 encryption algorithm for EVP. 25 26=over 4 27 28=item EVP_rc5_32_12_16_cbc(), 29EVP_rc5_32_12_16_cfb(), 30EVP_rc5_32_12_16_cfb64(), 31EVP_rc5_32_12_16_ecb(), 32EVP_rc5_32_12_16_ofb() 33 34RC5 encryption algorithm in CBC, CFB, ECB and OFB modes respectively. This is a 35variable key length cipher with an additional "number of rounds" parameter. By 36default the key length is set to 128 bits and 12 rounds. Alternative key lengths 37can be set using L<EVP_CIPHER_CTX_set_key_length(3)>. The maximum key length is 382040 bits. 39 40The following rc5 specific I<ctrl>s are supported (see 41L<EVP_CIPHER_CTX_ctrl(3)>). 42 43=over 4 44 45=item EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC5_ROUNDS, rounds, NULL) 46 47Sets the number of rounds to B<rounds>. This must be one of RC5_8_ROUNDS, 48RC5_12_ROUNDS or RC5_16_ROUNDS. 49 50=item EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GET_RC5_ROUNDS, 0, &rounds) 51 52Stores the number of rounds currently configured in B<*rounds> where B<*rounds> 53is an int. 54 55=back 56 57=back 58 59=head1 NOTES 60 61Developers should be aware of the negative performance implications of 62calling these functions multiple times and should consider using 63L<EVP_CIPHER_fetch(3)> with L<EVP_CIPHER-RC5(7)> instead. 64See L<crypto(7)/Performance> for further information. 65 66=head1 RETURN VALUES 67 68These functions return an B<EVP_CIPHER> structure that contains the 69implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for 70details of the B<EVP_CIPHER> structure. 71 72 73=head1 SEE ALSO 74 75L<evp(7)>, 76L<EVP_EncryptInit(3)>, 77L<EVP_CIPHER_meth_new(3)> 78 79=head1 COPYRIGHT 80 81Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved. 82 83Licensed under the Apache License 2.0 (the "License"). You may not use 84this file except in compliance with the License. You can obtain a copy 85in the file LICENSE in the source distribution or at 86L<https://www.openssl.org/source/license.html>. 87 88=cut 89
