| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | RSA_size, RSA_bits, RSA_security_bits - get RSA modulus size or security bits
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| 6 |
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| 7 | =head1 SYNOPSIS
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| 8 |
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| 9 | #include <openssl/rsa.h>
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| 10 |
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| 11 | int RSA_bits(const RSA *rsa);
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| 12 |
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| 13 | The following functions have been deprecated since OpenSSL 3.0, and can be
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| 14 | hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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| 15 | see L<openssl_user_macros(7)>:
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| 16 |
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| 17 | int RSA_size(const RSA *rsa);
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| 18 |
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| 19 | int RSA_security_bits(const RSA *rsa);
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| 20 |
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| 21 | =head1 DESCRIPTION
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| 22 |
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| 23 | RSA_bits() returns the number of significant bits.
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| 24 |
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| 25 | B<rsa> and B<rsa-E<gt>n> must not be B<NULL>.
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| 26 |
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| 27 | The remaining functions described on this page are deprecated.
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| 28 | Applications should instead use L<EVP_PKEY_get_size(3)>, L<EVP_PKEY_get_bits(3)>
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| 29 | and L<EVP_PKEY_get_security_bits(3)>.
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| 30 |
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| 31 | RSA_size() returns the RSA modulus size in bytes. It can be used to
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| 32 | determine how much memory must be allocated for an RSA encrypted
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| 33 | value.
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| 34 |
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| 35 | RSA_security_bits() returns the number of security bits of the given B<rsa>
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| 36 | key. See L<BN_security_bits(3)>.
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| 37 |
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| 38 | =head1 RETURN VALUES
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| 39 |
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| 40 | RSA_bits() returns the number of bits in the key.
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| 41 |
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| 42 | RSA_size() returns the size of modulus in bytes.
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| 43 |
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| 44 | RSA_security_bits() returns the number of security bits.
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| 45 |
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| 46 | =head1 SEE ALSO
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| 47 |
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| 48 | L<BN_num_bits(3)>
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| 49 |
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| 50 | =head1 HISTORY
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| 51 |
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| 52 | The RSA_size() and RSA_security_bits() functions were deprecated in OpenSSL 3.0.
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| 53 |
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| 54 | The RSA_bits() function was added in OpenSSL 1.1.0.
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| 55 |
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| 56 | =head1 COPYRIGHT
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| 57 |
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| 58 | Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 59 |
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| 60 | Licensed under the Apache License 2.0 (the "License"). You may not use
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| 61 | this file except in compliance with the License. You can obtain a copy
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| 62 | in the file LICENSE in the source distribution or at
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| 63 | L<https://www.openssl.org/source/license.html>.
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| 64 |
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| 65 | =cut
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