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36 lines
847 B
36 lines
847 B
=pod |
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=head1 NAME |
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BN_mod_inverse - compute inverse modulo n |
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=head1 SYNOPSIS |
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#include <openssl/bn.h> |
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BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n, |
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BN_CTX *ctx); |
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=head1 DESCRIPTION |
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BN_mod_inverse() computes the inverse of B<a> modulo B<n> |
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places the result in B<r> (C<(a*r)%n==1>). If B<r> is NULL, |
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a new B<BIGNUM> is created. |
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B<ctx> is a previously allocated B<BN_CTX> used for temporary |
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variables. B<r> may be the same B<BIGNUM> as B<a> or B<n>. |
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=head1 RETURN VALUES |
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BN_mod_inverse() returns the B<BIGNUM> containing the inverse, and |
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NULL on error. The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. |
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=head1 SEE ALSO |
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L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)> |
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=head1 HISTORY |
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BN_mod_inverse() is available in all versions of SSLeay and OpenSSL. |
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=cut
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