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BN_zero.3ssl
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word \- BIGNUM assignment operations .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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, BN_ULONG w); \& BN_ULONG BN_get_word(BIGNUM *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fB\s-1BN_ULONG\s0\fR is a macro that will be an unsigned integral type optimied for the most efficient implementation on the local platform. .PP \&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR set \fBa\fR to the values 0, 1 and \&\fBw\fR respectively. \fBBN_zero()\fR and \fBBN_one()\fR are macros. .PP \&\fBBN_value_one()\fR returns a \fB\s-1BIGNUM\s0\fR constant of value 1. This constant is useful for use in comparisons and assignment. .PP \&\fBBN_get_word()\fR returns \fBa\fR, if it can be represented as a \fB\s-1BN_ULONG\s0\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_get_word()\fR returns the value \fBa\fR, or all-bits-set if \fBa\fR cannot be represented as a \fB\s-1BN_ULONG\s0\fR. .PP \&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR return 1 on success, 0 otherwise. \&\fBBN_value_one()\fR returns the constant. .SH "BUGS" .IX Header "BUGS" If a \fB\s-1BIGNUM\s0\fR is equal to the value of all-bits-set, it will collide with the error condition returned by \fBBN_get_word()\fR which uses that as an error value. .PP \&\fB\s-1BN_ULONG\s0\fR should probably be a typedef. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbn\fR\|(3), \fBBN_bn2bin\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR are available in all versions of SSLeay and OpenSSL. \fBBN_value_one()\fR and \fBBN_get_word()\fR were added in SSLeay 0.8. .PP \&\fBBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL 0.9.7.
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