182 lines
5.3 KiB
Groff
182 lines
5.3 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BN_zero 3"
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.TH BN_zero 3 "2014-10-15" "1.0.1j" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "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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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bn.h>
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\&
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\& int BN_zero(BIGNUM *a);
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\& int BN_one(BIGNUM *a);
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\&
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\& const BIGNUM *BN_value_one(void);
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\&
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\& int BN_set_word(BIGNUM *a, unsigned long w);
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\& unsigned long BN_get_word(BIGNUM *a);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR set \fBa\fR to the values 0, 1 and
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\&\fBw\fR respectively. \fIBN_zero()\fR and \fIBN_one()\fR are macros.
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.PP
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\&\fIBN_value_one()\fR returns a \fB\s-1BIGNUM\s0\fR constant of value 1. This constant
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is useful for use in comparisons and assignment.
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.PP
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\&\fIBN_get_word()\fR returns \fBa\fR, if it can be represented as an unsigned
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long.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_get_word()\fR returns the value \fBa\fR, and 0xffffffffL if \fBa\fR cannot
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be represented as an unsigned long.
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.PP
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\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR return 1 on success, 0 otherwise.
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\&\fIBN_value_one()\fR returns the constant.
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.SH "BUGS"
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.IX Header "BUGS"
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Someone might change the constant.
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.PP
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If a \fB\s-1BIGNUM\s0\fR is equal to 0xffffffffL it can be represented as an
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unsigned long but this value is also returned on error.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbn\fR\|(3), \fIBN_bn2bin\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR are available in all versions of
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SSLeay and OpenSSL. \fIBN_value_one()\fR and \fIBN_get_word()\fR were added in
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SSLeay 0.8.
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.PP
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\&\fIBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL
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0.9.7.
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