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135 .IX Title "BN_zero 3"
136 .TH BN_zero 3 "2016-05-03" "1.0.2h" "OpenSSL"
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142 BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word \- BIGNUM assignment
145 .IX Header "SYNOPSIS"
147 \& #include <openssl/bn.h>
149 \& int BN_zero(BIGNUM *a);
150 \& int BN_one(BIGNUM *a);
152 \& const BIGNUM *BN_value_one(void);
154 \& int BN_set_word(BIGNUM *a, unsigned long w);
155 \& unsigned long BN_get_word(BIGNUM *a);
158 .IX Header "DESCRIPTION"
159 \&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR set \fBa\fR to the values 0, 1 and
160 \&\fBw\fR respectively. \fIBN_zero()\fR and \fIBN_one()\fR are macros.
162 \&\fIBN_value_one()\fR returns a \fB\s-1BIGNUM\s0\fR constant of value 1. This constant
163 is useful for use in comparisons and assignment.
165 \&\fIBN_get_word()\fR returns \fBa\fR, if it can be represented as an unsigned
168 .IX Header "RETURN VALUES"
169 \&\fIBN_get_word()\fR returns the value \fBa\fR, and 0xffffffffL if \fBa\fR cannot
170 be represented as an unsigned long.
172 \&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR return 1 on success, 0 otherwise.
173 \&\fIBN_value_one()\fR returns the constant.
176 Someone might change the constant.
178 If a \fB\s-1BIGNUM\s0\fR is equal to 0xffffffffL it can be represented as an
179 unsigned long but this value is also returned on error.
181 .IX Header "SEE ALSO"
182 \&\fIbn\fR\|(3), \fIBN_bn2bin\fR\|(3)
185 \&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR are available in all versions of
186 SSLeay and OpenSSL. \fIBN_value_one()\fR and \fIBN_get_word()\fR were added in
189 \&\fIBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL