Golang C.secp256k1_ec_pubkey_create类(方法)实例源码

func GenerateKeyPair() ([]byte, []byte) {
	var seckey []byte = randentropy.GetEntropyCSPRNG(32)
	var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
	var pubkey64 []byte = make([]byte, 64) // secp256k1_pubkey
	var pubkey65 []byte = make([]byte, 65) // 65 byte uncompressed pubkey
	pubkey64_ptr := (*C.secp256k1_pubkey)(unsafe.Pointer(&pubkey64[0]))
	pubkey65_ptr := (*C.uchar)(unsafe.Pointer(&pubkey65[0]))

	ret := C.secp256k1_ec_pubkey_create(
		context,
		pubkey64_ptr,
		seckey_ptr,
	)

	if ret != C.int(1) {
		return GenerateKeyPair() // invalid secret, try again
	}

	var output_len C.size_t

	C.secp256k1_ec_pubkey_serialize( // always returns 1
		context,
		pubkey65_ptr,
		&output_len,
		pubkey64_ptr,
		0, // SECP256K1_EC_COMPRESSED
	)

	return pubkey65, seckey
}

func Pubkey_create(seckey [32]byte, compressed bool) ([]byte, bool) {
	comp := C.int(0)
	bufsize := 65
	if compressed {
		comp = 1
		bufsize = 33
	}
	pubkey := make([]C.uchar, bufsize)
	pubkeylen := C.int(0)
	success := C.secp256k1_ec_pubkey_create(&pubkey[0],
		&pubkeylen,
		cBuf(seckey[:]),
		comp)
	return C.GoBytes(unsafe.Pointer(&pubkey[0]), pubkeylen), goBool(success)
}

func GenerateKeyPair() ([]byte, []byte) {

	pubkey_len := C.int(65)
	const seckey_len = 32

	var pubkey []byte = make([]byte, pubkey_len)
	var seckey []byte = randentropy.GetEntropyCSPRNG(seckey_len)

	var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
	var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))

	ret := C.secp256k1_ec_pubkey_create(
		pubkey_ptr, &pubkey_len,
		seckey_ptr, 0)

	if ret != C.int(1) {
		return GenerateKeyPair() //invalid secret, try again
	}
	return pubkey, seckey
}

func GeneratePubKey(seckey []byte) ([]byte, error) {
	if err := VerifySeckeyValidity(seckey); err != nil {
		return nil, err
	}

	var pubkey []byte = make([]byte, 64)
	var pubkey_ptr *C.secp256k1_pubkey = (*C.secp256k1_pubkey)(unsafe.Pointer(&pubkey[0]))

	var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))

	ret := C.secp256k1_ec_pubkey_create(
		context,
		pubkey_ptr,
		seckey_ptr,
	)

	if ret != C.int(1) {
		return nil, errors.New("Unable to generate pubkey from seckey")
	}

	return pubkey, nil
}

func GenerateKeyPair() ([]byte, []byte) {

	pubkey_len := C.int(65)
	const seckey_len = 32

	var pubkey []byte = make([]byte, pubkey_len)
	var seckey []byte = randentropy.GetEntropyCSPRNG(seckey_len)

	var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
	var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))

	ret := C.secp256k1_ec_pubkey_create(
		pubkey_ptr, &pubkey_len,
		seckey_ptr, 0) // uncompressed

	// or, see randFieldElement at https://golang.org/src/crypto/ecdsa/ecdsa.go#61
	// apparently not *every* 256 bit int is on the curve
	// XXX: is this the same as validating the privkey before calling create?
	if ret != C.int(1) {
		return GenerateKeyPair() //invalid secret, try again
	}
	return pubkey, seckey
}