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[dragonfly.git] / secure / lib / libcrypto / man / BN_mod_inverse.3
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129.\" ========================================================================
130.\"
131.IX Title "BN_mod_inverse 3"
aac4ff6f 132.TH BN_mod_inverse 3 "2008-09-06" "0.9.8h" "OpenSSL"
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133.SH "NAME"
134BN_mod_inverse \- compute inverse modulo n
135.SH "SYNOPSIS"
8b0cefbb 136.IX Header "SYNOPSIS"
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137.Vb 1
138\& #include <openssl/bn.h>
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139.Ve
140.PP
141.Vb 2
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142\& BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
143\& BN_CTX *ctx);
144.Ve
145.SH "DESCRIPTION"
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146.IX Header "DESCRIPTION"
147\&\fIBN_mod_inverse()\fR computes the inverse of \fBa\fR modulo \fBn\fR
148places the result in \fBr\fR (\f(CW\*(C`(a*r)%n==1\*(C'\fR). If \fBr\fR is \s-1NULL\s0,
149a new \fB\s-1BIGNUM\s0\fR is created.
984263bc 150.PP
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151\&\fBctx\fR is a previously allocated \fB\s-1BN_CTX\s0\fR used for temporary
152variables. \fBr\fR may be the same \fB\s-1BIGNUM\s0\fR as \fBa\fR or \fBn\fR.
984263bc 153.SH "RETURN VALUES"
74dab6c2 154.IX Header "RETURN VALUES"
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155\&\fIBN_mod_inverse()\fR returns the \fB\s-1BIGNUM\s0\fR containing the inverse, and
156\&\s-1NULL\s0 on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
157.SH "SEE ALSO"
74dab6c2 158.IX Header "SEE ALSO"
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159\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
160.SH "HISTORY"
984263bc 161.IX Header "HISTORY"
8b0cefbb 162\&\fIBN_mod_inverse()\fR is available in all versions of SSLeay and OpenSSL.