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1 .\" $NetBSD: libcrypto.pl,v 1.3 2007/11/27 22:16:03 christos Exp $
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136 .IX Title "BN_cmp 3"
137 .TH BN_cmp 3 "2000-01-26" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
139 .\" way too many mistakes in technical documents.
140 .if n .ad l
141 .nh
142 .SH "NAME"
143 BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd \- BIGNUM comparison and test functions
144 .SH "LIBRARY"
145 libcrypto, -lcrypto
146 .SH "SYNOPSIS"
147 .IX Header "SYNOPSIS"
148 .Vb 1
149 \& #include <openssl/bn.h>
150 \&
151 \& int BN_cmp(BIGNUM *a, BIGNUM *b);
152 \& int BN_ucmp(BIGNUM *a, BIGNUM *b);
153 \&
154 \& int BN_is_zero(BIGNUM *a);
155 \& int BN_is_one(BIGNUM *a);
156 \& int BN_is_word(BIGNUM *a, BN_ULONG w);
157 \& int BN_is_odd(BIGNUM *a);
158 .Ve
159 .SH "DESCRIPTION"
160 .IX Header "DESCRIPTION"
161 \&\fIBN_cmp()\fR compares the numbers \fBa\fR and \fBb\fR. \fIBN_ucmp()\fR compares their
162 absolute values.
163 .PP
164 \&\fIBN_is_zero()\fR, \fIBN_is_one()\fR and \fIBN_is_word()\fR test if \fBa\fR equals 0, 1,
165 or \fBw\fR respectively. \fIBN_is_odd()\fR tests if a is odd.
166 .PP
167 \&\fIBN_is_zero()\fR, \fIBN_is_one()\fR, \fIBN_is_word()\fR and \fIBN_is_odd()\fR are macros.
168 .SH "RETURN VALUES"
169 .IX Header "RETURN VALUES"
170 \&\fIBN_cmp()\fR returns \-1 if \fBa\fR < \fBb\fR, 0 if \fBa\fR == \fBb\fR and 1 if
171 \&\fBa\fR > \fBb\fR. \fIBN_ucmp()\fR is the same using the absolute values
172 of \fBa\fR and \fBb\fR.
173 .PP
174 \&\fIBN_is_zero()\fR, \fIBN_is_one()\fR \fIBN_is_word()\fR and \fIBN_is_odd()\fR return 1 if
175 the condition is true, 0 otherwise.
176 .SH "SEE ALSO"
177 .IX Header "SEE ALSO"
178 \&\fIopenssl_bn\fR\|(3)
179 .SH "HISTORY"
180 .IX Header "HISTORY"
181 \&\fIBN_cmp()\fR, \fIBN_ucmp()\fR, \fIBN_is_zero()\fR, \fIBN_is_one()\fR and \fIBN_is_word()\fR are
182 available in all versions of SSLeay and OpenSSL.
183 \&\fIBN_is_odd()\fR was added in SSLeay 0.8.