63 lines
1.5 KiB
Plaintext
63 lines
1.5 KiB
Plaintext
=pod
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=head1 NAME
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BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
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operations
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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int BN_zero(BIGNUM *a);
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int BN_one(BIGNUM *a);
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const BIGNUM *BN_value_one(void);
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int BN_set_word(BIGNUM *a, BN_ULONG w);
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BN_ULONG BN_get_word(BIGNUM *a);
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=head1 DESCRIPTION
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B<BN_ULONG> is a macro that will be an unsigned integral type optimied
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for the most efficient implementation on the local platform.
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BN_zero(), BN_one() and BN_set_word() set B<a> to the values 0, 1 and
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B<w> respectively. BN_zero() and BN_one() are macros.
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BN_value_one() returns a B<BIGNUM> constant of value 1. This constant
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is useful for use in comparisons and assignment.
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BN_get_word() returns B<a>, if it can be represented as a B<BN_ULONG>.
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=head1 RETURN VALUES
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BN_get_word() returns the value B<a>, or all-bits-set if B<a> cannot
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be represented as a B<BN_ULONG>.
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BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise.
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BN_value_one() returns the constant.
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=head1 BUGS
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If a B<BIGNUM> is equal to the value of all-bits-set, it will collide
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with the error condition returned by BN_get_word() which uses that
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as an error value.
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B<BN_ULONG> should probably be a typedef.
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=head1 SEE ALSO
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L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)>
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=head1 HISTORY
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BN_zero(), BN_one() and BN_set_word() are available in all versions of
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SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in
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SSLeay 0.8.
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BN_value_one() was changed to return a true const BIGNUM * in OpenSSL
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0.9.7.
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=cut
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