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Add functions for point negation and subtraction

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This commit is contained in:
Matthias Schiffer 2015-10-02 20:57:19 +09:00
parent a68abb34c2
commit 962888f03f
2 changed files with 32 additions and 0 deletions
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13
include/libuecc/ecc.h
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@ -86,6 +86,13 @@ void ecc_25519_store_packed(ecc_int256_t *out, const ecc_25519_work_t *in);
/** Checks if a point is the identity element of the Elliptic Curve group */
int ecc_25519_is_identity(const ecc_25519_work_t *in);
/**
* Negates a point of the Elliptic Curve
*
* The same pointer may be given for input and output
*/
void ecc_25519_negate(ecc_25519_work_t *out, const ecc_25519_work_t *in);
/**
* Doubles a point of the Elliptic Curve
*
@ -102,6 +109,12 @@ void ecc_25519_double(ecc_25519_work_t *out, const ecc_25519_work_t *in);
*/
void ecc_25519_add(ecc_25519_work_t *out, const ecc_25519_work_t *in1, const ecc_25519_work_t *in2);
/**
* Subtracts two points of the Elliptic Curve
*
* The same pointers may be given for input and output.
*/
void ecc_25519_sub(ecc_25519_work_t *out, const ecc_25519_work_t *in1, const ecc_25519_work_t *in2);
/**
* Does a scalar multiplication of a point of the Elliptic Curve with an integer of a given bit length