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EC_POINT_ADD(3) FreeBSD Library Functions Manual EC_POINT_ADD(3) NAME EC_POINT_add, EC_POINT_dbl, EC_POINT_invert, EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_cmp, EC_POINT_make_affine, EC_POINT_mul - perform mathematical operations and tests on EC_POINT objects SYNOPSIS #include <openssl/ec.h> #include <openssl/bn.h> int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx); int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx); int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx); int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *p); int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx); int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx); int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx); int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n, const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx); DESCRIPTION These functions operate on EC_POINT objects created by EC_POINT_new(3). EC_POINT_add() adds the two points a and b and places the result in r. Similarly EC_POINT_dbl() doubles the point a and places the result in r. In both cases it is valid for r to be one of a or b. EC_POINT_invert() calculates the inverse of the supplied point a. The result is placed back in a. The function EC_POINT_is_at_infinity() tests whether the supplied point is at infinity or not. EC_POINT_is_on_curve() tests whether the supplied point is on the curve or not. EC_POINT_cmp() compares the two supplied points and tests whether or not they are equal. EC_POINT_mul() calculates the value generator * n + q * m and stores the result in r. The value n may be NULL, in which case the result is just q * m. See EC_GROUP_copy(3) for information about the generator. RETURN VALUES The following functions return 1 on success or 0 on error: EC_POINT_add(), EC_POINT_dbl(), EC_POINT_invert(), EC_POINT_make_affine(), and EC_POINT_mul() EC_POINT_is_at_infinity() returns 1 if the point is at infinity or 0 otherwise. EC_POINT_is_on_curve() returns 1 if the point is on the curve, 0 if not, or -1 on error. EC_POINT_cmp() returns 1 if the points are not equal, 0 if they are, or -1 on error. SEE ALSO d2i_ECPKParameters(3), EC_GROUP_copy(3), EC_GROUP_new(3), EC_KEY_new(3), EC_POINT_new(3) HISTORY EC_POINT_add(), EC_POINT_dbl(), EC_POINT_invert(), EC_POINT_is_at_infinity(), EC_POINT_is_on_curve(), EC_POINT_cmp(), EC_POINT_make_affine(), and EC_POINT_mul() first appeared in OpenSSL 0.9.7 and have been available since OpenBSD 3.2. FreeBSD 14.1-RELEASE-p8 March 8, 2025 FreeBSD 14.1-RELEASE-p8