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46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
=pod
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=head1 NAME
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BN_rand, BN_pseudo_rand - Generate pseudo-random number
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
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int BN_pseudo_rand(BIGNUM *rnd, int bits, int top,int bottom);
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=head1 DESCRIPTION
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BN_rand() generates a cryptographically strong pseudo-random number of
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B<bits> bits in length and stores it in B<rnd>. If B<top> is true, the
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two most significant bits of the number will be set to 1, so that the
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product of two such random numbers will always have 2*B<bits> length.
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If B<bottom> is true, the number will be odd.
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BN_pseudo_rand() does the same, but pseudo-random numbers generated by
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this function are not necessarily unpredictable. They can be used for
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non-cryptographic purposes and for certain purposes in cryptographic
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protocols, but usually not for key generation etc.
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The PRNG must be seeded prior to calling BN_rand().
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=head1 RETURN VALUES
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BN_rand() and BN_pseudo_rand() return 1 on success, 0 on error.
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The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
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=head1 SEE ALSO
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L<bn(3)|bn(3)>, L<err(3)|err(3)>, L<rand(3)|rand(3)>,
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L<RAND_add(3)|RAND_add(3)>, L<RAND_bytes(3)|RAND_bytes(3)>
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=head1 HISTORY
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BN_rand() is available in all versions of SSLeay and OpenSSL.
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BN_pseudo_rand() was added in OpenSSL 0.9.5.
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=cut
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