NAME

       EVP_rc5_32_12_16_cbc, EVP_rc5_32_12_16_cfb, EVP_rc5_32_12_16_cfb64, EVP_rc5_32_12_16_ecb,
       EVP_rc5_32_12_16_ofb - EVP RC5 cipher

SYNOPSIS

        #include <openssl/evp.h>

        const EVP_CIPHER *EVP_rc5_32_12_16_cbc(void);
        const EVP_CIPHER *EVP_rc5_32_12_16_cfb(void);
        const EVP_CIPHER *EVP_rc5_32_12_16_cfb64(void);
        const EVP_CIPHER *EVP_rc5_32_12_16_ecb(void);
        const EVP_CIPHER *EVP_rc5_32_12_16_ofb(void);

DESCRIPTION

       The RC5 encryption algorithm for EVP.

       EVP_rc5_32_12_16_cbc(), EVP_rc5_32_12_16_cfb(), EVP_rc5_32_12_16_cfb64(),
       EVP_rc5_32_12_16_ecb(), EVP_rc5_32_12_16_ofb()
           RC5 encryption algorithm in CBC, CFB, ECB and OFB modes respectively. This is a
           variable key length cipher with an additional "number of rounds" parameter. By default
           the key length is set to 128 bits and 12 rounds. Alternative key lengths can be set
           using EVP_CIPHER_CTX_set_key_length(3). The maximum key length is 2040 bits.

           The following rc5 specific ctrls are supported (see EVP_CIPHER_CTX_ctrl(3)).

           EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC5_ROUNDS, rounds, NULL)
               Sets the number of rounds to rounds. This must be one of RC5_8_ROUNDS,
               RC5_12_ROUNDS or RC5_16_ROUNDS.

           EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GET_RC5_ROUNDS, 0, &rounds)
               Stores the number of rounds currently configured in *rounds where *rounds is an
               int.

NOTES

       Developers should be aware of the negative performance implications of calling these
       functions multiple times and should consider using EVP_CIPHER_fetch(3) with
       EVP_CIPHER-RC5(7) instead.  See "Performance" in crypto(7) for further information.

RETURN VALUES

       These functions return an EVP_CIPHER structure that contains the implementation of the
       symmetric cipher. See EVP_CIPHER_meth_new(3) for details of the EVP_CIPHER structure.

SEE ALSO

       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)

COPYRIGHT

       Copyright 2017-2023 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>.