1BN_mod_inverse(3)                   OpenSSL                  BN_mod_inverse(3)
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NAME

6       BN_mod_inverse - compute inverse modulo n
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SYNOPSIS

9        #include <openssl/bn.h>
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11        BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
12                  BN_CTX *ctx);
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DESCRIPTION

15       BN_mod_inverse() computes the inverse of a modulo n places the result
16       in r ("(a*r)%n==1"). If r is NULL, a new BIGNUM is created.
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18       ctx is a previously allocated BN_CTX used for temporary variables. r
19       may be the same BIGNUM as a or n.
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RETURN VALUES

22       BN_mod_inverse() returns the BIGNUM containing the inverse, and NULL on
23       error. The error codes can be obtained by ERR_get_error(3).
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SEE ALSO

26       bn(3), ERR_get_error(3), BN_add(3)
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HISTORY

29       BN_mod_inverse() is available in all versions of SSLeay and OpenSSL.
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330.9.8b                            2002-09-25                 BN_mod_inverse(3)