1RSA_SIZE(3)                         OpenSSL                        RSA_SIZE(3)
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NAME

6       RSA_size, RSA_bits, RSA_security_bits - get RSA modulus size or
7       security bits
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SYNOPSIS

10        #include <openssl/rsa.h>
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12        int RSA_size(const RSA *rsa);
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14        int RSA_bits(const RSA *rsa);
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16        int RSA_security_bits(const RSA *rsa)
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DESCRIPTION

19       RSA_size() returns the RSA modulus size in bytes. It can be used to
20       determine how much memory must be allocated for an RSA encrypted value.
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22       RSA_bits() returns the number of significant bits.
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24       rsa and rsa->n must not be NULL.
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26       RSA_security_bits() returns the number of security bits of the given
27       rsa key. See BN_security_bits(3).
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RETURN VALUES

30       RSA_size() returns the size of modulus in bytes.
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32       DSA_bits() returns the number of bits in the key.
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34       RSA_security_bits() returns the number of security bits.
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SEE ALSO

37       BN_num_bits(3)
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HISTORY

40       The RSA_bits() function was added in OpenSSL 1.1.0.
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43       Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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45       Licensed under the OpenSSL license (the "License").  You may not use
46       this file except in compliance with the License.  You can obtain a copy
47       in the file LICENSE in the source distribution or at
48       <https://www.openssl.org/source/license.html>.
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521.1.1i                            2021-01-26                       RSA_SIZE(3)
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