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131 .IX Title "BN_cmp 3"
132 .TH BN_cmp 3 "2009-07-23" "0.9.8k" "OpenSSL"
133 .SH "NAME"
134 BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd \- BIGNUM comparison and test functions
135 .SH "SYNOPSIS"
136 .IX Header "SYNOPSIS"
137 .Vb 1
138 \& #include <openssl/bn.h>
139 .Ve
140 .PP
141 .Vb 2
142 \& int BN_cmp(BIGNUM *a, BIGNUM *b);
143 \& int BN_ucmp(BIGNUM *a, BIGNUM *b);
144 .Ve
145 .PP
146 .Vb 4
147 \& int BN_is_zero(BIGNUM *a);
148 \& int BN_is_one(BIGNUM *a);
149 \& int BN_is_word(BIGNUM *a, BN_ULONG w);
150 \& int BN_is_odd(BIGNUM *a);
151 .Ve
152 .SH "DESCRIPTION"
153 .IX Header "DESCRIPTION"
154 \&\fIBN_cmp()\fR compares the numbers \fBa\fR and \fBb\fR. \fIBN_ucmp()\fR compares their
155 absolute values.
156 .PP
157 \&\fIBN_is_zero()\fR, \fIBN_is_one()\fR and \fIBN_is_word()\fR test if \fBa\fR equals 0, 1,
158 or \fBw\fR respectively. \fIBN_is_odd()\fR tests if a is odd.
159 .PP
160 \&\fIBN_is_zero()\fR, \fIBN_is_one()\fR, \fIBN_is_word()\fR and \fIBN_is_odd()\fR are macros.
161 .SH "RETURN VALUES"
162 .IX Header "RETURN VALUES"
163 \&\fIBN_cmp()\fR returns \-1 if \fBa\fR < \fBb\fR, 0 if \fBa\fR == \fBb\fR and 1 if
164 \&\fBa\fR > \fBb\fR. \fIBN_ucmp()\fR is the same using the absolute values
165 of \fBa\fR and \fBb\fR.
166 .PP
167 \&\fIBN_is_zero()\fR, \fIBN_is_one()\fR \fIBN_is_word()\fR and \fIBN_is_odd()\fR return 1 if
168 the condition is true, 0 otherwise.
169 .SH "SEE ALSO"
170 .IX Header "SEE ALSO"
171 \&\fIbn\fR\|(3)
172 .SH "HISTORY"
173 .IX Header "HISTORY"
174 \&\fIBN_cmp()\fR, \fIBN_ucmp()\fR, \fIBN_is_zero()\fR, \fIBN_is_one()\fR and \fIBN_is_word()\fR are
175 available in all versions of SSLeay and OpenSSL.
176 \&\fIBN_is_odd()\fR was added in SSLeay 0.8.