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e798248c84
Clearly document that implicit fetching is slower when using providers, and explain prefetching. Added to crypto.pod and migration_guide.pod links to it. Add a link to EVP_default_properties_enable_fips() in crypto.pod. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/20354)
89 lines
2.2 KiB
Plaintext
89 lines
2.2 KiB
Plaintext
=pod
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=head1 NAME
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EVP_rc5_32_12_16_cbc,
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EVP_rc5_32_12_16_cfb,
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EVP_rc5_32_12_16_cfb64,
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EVP_rc5_32_12_16_ecb,
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EVP_rc5_32_12_16_ofb
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- EVP RC5 cipher
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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const EVP_CIPHER *EVP_rc5_32_12_16_cbc(void);
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const EVP_CIPHER *EVP_rc5_32_12_16_cfb(void);
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const EVP_CIPHER *EVP_rc5_32_12_16_cfb64(void);
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const EVP_CIPHER *EVP_rc5_32_12_16_ecb(void);
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const EVP_CIPHER *EVP_rc5_32_12_16_ofb(void);
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=head1 DESCRIPTION
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The RC5 encryption algorithm for EVP.
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=over 4
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=item EVP_rc5_32_12_16_cbc(),
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EVP_rc5_32_12_16_cfb(),
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EVP_rc5_32_12_16_cfb64(),
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EVP_rc5_32_12_16_ecb(),
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EVP_rc5_32_12_16_ofb()
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RC5 encryption algorithm in CBC, CFB, ECB and OFB modes respectively. This is a
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variable key length cipher with an additional "number of rounds" parameter. By
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default the key length is set to 128 bits and 12 rounds. Alternative key lengths
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can be set using L<EVP_CIPHER_CTX_set_key_length(3)>. The maximum key length is
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2040 bits.
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The following rc5 specific I<ctrl>s are supported (see
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L<EVP_CIPHER_CTX_ctrl(3)>).
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=over 4
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=item EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC5_ROUNDS, rounds, NULL)
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Sets the number of rounds to B<rounds>. This must be one of RC5_8_ROUNDS,
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RC5_12_ROUNDS or RC5_16_ROUNDS.
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=item EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GET_RC5_ROUNDS, 0, &rounds)
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Stores the number of rounds currently configured in B<*rounds> where B<*rounds>
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is an int.
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=back
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=back
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=head1 NOTES
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Developers should be aware of the negative performance implications of
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calling these functions multiple times and should consider using
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L<EVP_CIPHER_fetch(3)> instead.
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See L<crypto(7)/Performance> for further information.
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=head1 RETURN VALUES
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These functions return an B<EVP_CIPHER> structure that contains the
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implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for
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details of the B<EVP_CIPHER> structure.
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=head1 SEE ALSO
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L<evp(7)>,
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L<EVP_EncryptInit(3)>,
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L<EVP_CIPHER_meth_new(3)>
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=head1 COPYRIGHT
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Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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