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BN_mod_inverse
Description
Return Values
See Also
History
 

NAME

BN_mod_inverse - compute inverse modulo n

Synopsis  

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

return to top DESCRIPTION  

BN_mod_inverse() computes the inverse of a modulo n places the result in r ((a*r)%n==1). If r is NULL, a new BIGNUM is created.

ctx is a previously allocated BN_CTX used for temporary variables. r may be the same BIGNUM as a or n.

return to top RETURN VALUES  

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

return to top SEE ALSO  

bn(3) , ERR_get_error(3) , BN_add(3)

return to top HISTORY  

BN_mod_inverse() is available in all versions of SSLeay and OpenSSL.
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