gistfile1.go

func TestPythonCrypto(t *testing.T) {
	signature := "638A54215D80A6713C8D523A6ADC4E6E73652D859103A36B700851CB0E61B66B8EBFC1A610C57D732EC6E0A8F06A9A7A28DF5051ECE514702FF9CDFF0B11F454"

	key := "03ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd3138"

	//keccak 256 digest
	//content := "f854018664697363763582765f82696490736563703235366b312d6b656363616b83697034847f00000189736563703235366b31a103ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd3138"
	digest := "d301ce462d3e639518f482c7f03821fec1e602018630ce621e1e7851c12343a6"

	bsig, err := hex.DecodeString(signature)
	if err != nil {
		t.Fatal(err)
	}

	bdigest, err := hex.DecodeString(digest)
	if err != nil {
		t.Fatal(err)
	}

	bpk, err := hex.DecodeString(key)
	if err != nil {
		t.Fatal(err)
	}

	pk, err := btcec.ParsePubKey(bpk, btcec.S256())
	if err != nil {
		t.Fatal(err)
	}

	sign, err := btcec.ParseSignature(bsig, btcec.S256())
	if err != nil {
		t.Fatal(err)
	}

	if !sign.Verify(bdigest, (*btcec.PublicKey)(pk)) {
		t.Fatal("signature not valid")
	}
}