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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/BN_zero.pod | |
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Diffstat (limited to 'openssl/doc/crypto/BN_zero.pod')
-rw-r--r-- | openssl/doc/crypto/BN_zero.pod | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/openssl/doc/crypto/BN_zero.pod b/openssl/doc/crypto/BN_zero.pod new file mode 100644 index 000000000..b555ec398 --- /dev/null +++ b/openssl/doc/crypto/BN_zero.pod @@ -0,0 +1,59 @@ +=pod + +=head1 NAME + +BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment +operations + +=head1 SYNOPSIS + + #include <openssl/bn.h> + + int BN_zero(BIGNUM *a); + int BN_one(BIGNUM *a); + + const BIGNUM *BN_value_one(void); + + int BN_set_word(BIGNUM *a, unsigned long w); + unsigned long BN_get_word(BIGNUM *a); + +=head1 DESCRIPTION + +BN_zero(), BN_one() and BN_set_word() set B<a> to the values 0, 1 and +B<w> respectively. BN_zero() and BN_one() are macros. + +BN_value_one() returns a B<BIGNUM> constant of value 1. This constant +is useful for use in comparisons and assignment. + +BN_get_word() returns B<a>, if it can be represented as an unsigned +long. + +=head1 RETURN VALUES + +BN_get_word() returns the value B<a>, and 0xffffffffL if B<a> cannot +be represented as an unsigned long. + +BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise. +BN_value_one() returns the constant. + +=head1 BUGS + +Someone might change the constant. + +If a B<BIGNUM> is equal to 0xffffffffL it can be represented as an +unsigned long but this value is also returned on error. + +=head1 SEE ALSO + +L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)> + +=head1 HISTORY + +BN_zero(), BN_one() and BN_set_word() are available in all versions of +SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in +SSLeay 0.8. + +BN_value_one() was changed to return a true const BIGNUM * in OpenSSL +0.9.7. + +=cut |