package txscript import ( "bytes" "testing" "github.com/lbryio/lbcd/wire" ) // TestParsePkScript ensures that the supported script types can be parsed // correctly and re-derived into its raw byte representation. func TestParsePkScript(t *testing.T) { t.Parallel() tests := []struct { name string pkScript []byte valid bool }{ { name: "empty output script", pkScript: []byte{}, valid: false, }, { name: "valid P2PKH", pkScript: []byte{ // OP_DUP 0x76, // OP_HASH160 0xa9, // OP_DATA_20 0x14, // <20-byte pubkey hash> 0xf0, 0x7a, 0xb8, 0xce, 0x72, 0xda, 0x4e, 0x76, 0x0b, 0x74, 0x7d, 0x48, 0xd6, 0x65, 0xec, 0x96, 0xad, 0xf0, 0x24, 0xf5, // OP_EQUALVERIFY 0x88, // OP_CHECKSIG 0xac, }, valid: true, }, // Invalid P2PKH - same as above but replaced OP_CHECKSIG with // OP_CHECKSIGVERIFY. { name: "invalid P2PKH", pkScript: []byte{ // OP_DUP 0x76, // OP_HASH160 0xa9, // OP_DATA_20 0x14, // <20-byte pubkey hash> 0xf0, 0x7a, 0xb8, 0xce, 0x72, 0xda, 0x4e, 0x76, 0x0b, 0x74, 0x7d, 0x48, 0xd6, 0x65, 0xec, 0x96, 0xad, 0xf0, 0x24, 0xf5, // OP_EQUALVERIFY 0x88, // OP_CHECKSIGVERIFY 0xad, }, valid: false, }, { name: "valid P2SH", pkScript: []byte{ // OP_HASH160 0xA9, // OP_DATA_20 0x14, // <20-byte script hash> 0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c, 0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03, 0x06, 0xf6, 0x96, 0xcd, // OP_EQUAL 0x87, }, valid: true, }, // Invalid P2SH - same as above but replaced OP_EQUAL with // OP_EQUALVERIFY. { name: "invalid P2SH", pkScript: []byte{ // OP_HASH160 0xA9, // OP_DATA_20 0x14, // <20-byte script hash> 0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c, 0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03, 0x06, 0xf6, 0x96, 0xcd, // OP_EQUALVERIFY 0x88, }, valid: false, }, { name: "valid v0 P2WSH", pkScript: []byte{ // OP_0 0x00, // OP_DATA_32 0x20, // <32-byte script hash> 0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c, 0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03, 0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd, }, valid: true, }, // Invalid v0 P2WSH - same as above but missing one byte. { name: "invalid v0 P2WSH", pkScript: []byte{ // OP_0 0x00, // OP_DATA_32 0x20, // <32-byte script hash> 0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c, 0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03, 0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, }, valid: false, }, { name: "valid v0 P2WPKH", pkScript: []byte{ // OP_0 0x00, // OP_DATA_20 0x14, // <20-byte pubkey hash> 0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c, 0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03, 0x06, 0xf6, 0x96, 0xcd, }, valid: true, }, // Invalid v0 P2WPKH - same as above but missing one byte. { name: "invalid v0 P2WPKH", pkScript: []byte{ // OP_0 0x00, // OP_DATA_20 0x14, // <20-byte pubkey hash> 0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c, 0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03, 0x06, 0xf6, 0x96, }, valid: false, }, } for _, test := range tests { t.Run(test.name, func(t *testing.T) { pkScript, err := ParsePkScript(test.pkScript) switch { case err != nil && test.valid: t.Fatalf("unable to parse valid pkScript=%x: %v", test.pkScript, err) case err == nil && !test.valid: t.Fatalf("successfully parsed invalid pkScript=%x", test.pkScript) } if !test.valid { return } if !bytes.Equal(pkScript.Script(), test.pkScript) { t.Fatalf("expected to re-derive pkScript=%x, "+ "got pkScript=%x", test.pkScript, pkScript.Script()) } }) } } // TestComputePkScript ensures that we can correctly re-derive an output's // pkScript by looking at the input's signature script/witness attempting to // spend it. func TestComputePkScript(t *testing.T) { t.Parallel() tests := []struct { name string sigScript []byte witness wire.TxWitness class ScriptClass pkScript []byte }{ { name: "empty sigScript and witness", sigScript: nil, witness: nil, class: NonStandardTy, pkScript: nil, }, { name: "P2PKH sigScript", sigScript: []byte{ // OP_DATA_73, 0x49, // <73-byte sig> 0x30, 0x44, 0x02, 0x20, 0x65, 0x92, 0xd8, 0x8e, 0x1d, 0x0a, 0x4a, 0x3c, 0xc5, 0x9f, 0x92, 0xae, 0xfe, 0x62, 0x54, 0x74, 0xa9, 0x4d, 0x13, 0xa5, 0x9f, 0x84, 0x97, 0x78, 0xfc, 0xe7, 0xdf, 0x4b, 0xe0, 0xc2, 0x28, 0xd8, 0x02, 0x20, 0x2d, 0xea, 0x36, 0x96, 0x19, 0x1f, 0xb7, 0x00, 0xc5, 0xa7, 0x7e, 0x22, 0xd9, 0xfb, 0x6b, 0x42, 0x67, 0x42, 0xa4, 0x2c, 0xac, 0xdb, 0x74, 0xa2, 0x7c, 0x43, 0xcd, 0x89, 0xa0, 0xf9, 0x44, 0x54, 0x12, 0x74, 0x01, // OP_DATA_33 0x21, // <33-byte compressed pubkey> 0x02, 0x7d, 0x56, 0x12, 0x09, 0x75, 0x31, 0xc2, 0x17, 0xfd, 0xd4, 0xd2, 0xe1, 0x7a, 0x35, 0x4b, 0x17, 0xf2, 0x7a, 0xef, 0x30, 0x9f, 0xb2, 0x7f, 0x1f, 0x1f, 0x7b, 0x73, 0x7d, 0x9a, 0x24, 0x49, 0x90, }, witness: nil, class: PubKeyHashTy, pkScript: []byte{ // OP_DUP 0x76, // OP_HASH160 0xa9, // OP_DATA_20 0x14, // <20-byte pubkey hash> 0xf0, 0x7a, 0xb8, 0xce, 0x72, 0xda, 0x4e, 0x76, 0x0b, 0x74, 0x7d, 0x48, 0xd6, 0x65, 0xec, 0x96, 0xad, 0xf0, 0x24, 0xf5, // OP_EQUALVERIFY 0x88, // OP_CHECKSIG 0xac, }, }, { name: "NP2WPKH sigScript", // Since this is a NP2PKH output, the sigScript is a // data push of a serialized v0 P2WPKH script. sigScript: []byte{ // OP_DATA_16 0x16, // <22-byte redeem script> 0x00, 0x14, 0x1d, 0x7c, 0xd6, 0xc7, 0x5c, 0x2e, 0x86, 0xf4, 0xcb, 0xf9, 0x8e, 0xae, 0xd2, 0x21, 0xb3, 0x0b, 0xd9, 0xa0, 0xb9, 0x28, }, // NP2PKH outputs include a witness, but it is not // needed to reconstruct the pkScript. witness: nil, class: ScriptHashTy, pkScript: []byte{ // OP_HASH160 0xa9, // OP_DATA_20 0x14, // <20-byte script hash> 0x90, 0x1c, 0x86, 0x94, 0xc0, 0x3f, 0xaf, 0xd5, 0x52, 0x28, 0x10, 0xe0, 0x33, 0x0f, 0x26, 0xe6, 0x7a, 0x85, 0x33, 0xcd, // OP_EQUAL 0x87, }, }, { name: "P2SH sigScript", sigScript: []byte{ 0x00, 0x49, 0x30, 0x46, 0x02, 0x21, 0x00, 0xda, 0xe6, 0xb6, 0x14, 0x1b, 0xa7, 0x24, 0x4f, 0x54, 0x62, 0xb6, 0x2a, 0x3b, 0x27, 0x59, 0xde, 0xe4, 0x46, 0x76, 0x19, 0x4e, 0x6c, 0x56, 0x8d, 0x5b, 0x1c, 0xda, 0x96, 0x2d, 0x4f, 0x6d, 0x79, 0x02, 0x21, 0x00, 0xa6, 0x6f, 0x60, 0x34, 0x46, 0x09, 0x0a, 0x22, 0x3c, 0xec, 0x30, 0x33, 0xd9, 0x86, 0x24, 0xd2, 0x73, 0xa8, 0x91, 0x55, 0xa5, 0xe6, 0x96, 0x66, 0x0b, 0x6a, 0x50, 0xa3, 0x46, 0x45, 0xbb, 0x67, 0x01, 0x48, 0x30, 0x45, 0x02, 0x21, 0x00, 0xe2, 0x73, 0x49, 0xdb, 0x93, 0x82, 0xe1, 0xf8, 0x8d, 0xae, 0x97, 0x5c, 0x71, 0x19, 0xb7, 0x79, 0xb6, 0xda, 0x43, 0xa8, 0x4f, 0x16, 0x05, 0x87, 0x11, 0x9f, 0xe8, 0x12, 0x1d, 0x85, 0xae, 0xee, 0x02, 0x20, 0x6f, 0x23, 0x2d, 0x0a, 0x7b, 0x4b, 0xfa, 0xcd, 0x56, 0xa0, 0x72, 0xcc, 0x2a, 0x44, 0x81, 0x31, 0xd1, 0x0d, 0x73, 0x35, 0xf9, 0xa7, 0x54, 0x8b, 0xee, 0x1f, 0x70, 0xc5, 0x71, 0x0b, 0x37, 0x9e, 0x01, 0x47, 0x52, 0x21, 0x03, 0xab, 0x11, 0x5d, 0xa6, 0xdf, 0x4f, 0x54, 0x0b, 0xd6, 0xc9, 0xc4, 0xbe, 0x5f, 0xdd, 0xcc, 0x24, 0x58, 0x8e, 0x7c, 0x2c, 0xaf, 0x13, 0x82, 0x28, 0xdd, 0x0f, 0xce, 0x29, 0xfd, 0x65, 0xb8, 0x7c, 0x21, 0x02, 0x15, 0xe8, 0xb7, 0xbf, 0xfe, 0x8d, 0x9b, 0xbd, 0x45, 0x81, 0xf9, 0xc3, 0xb6, 0xf1, 0x6d, 0x67, 0x08, 0x36, 0xc3, 0x0b, 0xb2, 0xe0, 0x3e, 0xfd, 0x9d, 0x41, 0x03, 0xb5, 0x59, 0xeb, 0x67, 0xcd, 0x52, 0xae, }, witness: nil, class: ScriptHashTy, pkScript: []byte{ // OP_HASH160 0xA9, // OP_DATA_20 0x14, // <20-byte script hash> 0x12, 0xd6, 0x9c, 0xd3, 0x38, 0xa3, 0x8d, 0x0d, 0x77, 0x83, 0xcf, 0x22, 0x64, 0x97, 0x63, 0x3d, 0x3c, 0x20, 0x79, 0xea, // OP_EQUAL 0x87, }, }, // Invalid P2SH (non push-data only script). { name: "invalid P2SH sigScript", sigScript: []byte{0x6b, 0x65, 0x6b}, // kek witness: nil, class: NonStandardTy, pkScript: nil, }, { name: "P2WSH witness", sigScript: nil, witness: [][]byte{ {}, // Witness script. { 0x21, 0x03, 0x82, 0x62, 0xa6, 0xc6, 0xce, 0xc9, 0x3c, 0x2d, 0x3e, 0xcd, 0x6c, 0x60, 0x72, 0xef, 0xea, 0x86, 0xd0, 0x2f, 0xf8, 0xe3, 0x32, 0x8b, 0xbd, 0x02, 0x42, 0xb2, 0x0a, 0xf3, 0x42, 0x59, 0x90, 0xac, 0xac, }, }, class: WitnessV0ScriptHashTy, pkScript: []byte{ // OP_0 0x00, // OP_DATA_32 0x20, // <32-byte script hash> 0x01, 0xd5, 0xd9, 0x2e, 0xff, 0xa6, 0xff, 0xba, 0x3e, 0xfa, 0x37, 0x9f, 0x98, 0x30, 0xd0, 0xf7, 0x56, 0x18, 0xb1, 0x33, 0x93, 0x82, 0x71, 0x52, 0xd2, 0x6e, 0x43, 0x09, 0x00, 0x0e, 0x88, 0xb1, }, }, { name: "P2WPKH witness", sigScript: nil, witness: [][]byte{ // Signature is not needed to re-derive the // pkScript. {}, // Compressed pubkey. { 0x03, 0x82, 0x62, 0xa6, 0xc6, 0xce, 0xc9, 0x3c, 0x2d, 0x3e, 0xcd, 0x6c, 0x60, 0x72, 0xef, 0xea, 0x86, 0xd0, 0x2f, 0xf8, 0xe3, 0x32, 0x8b, 0xbd, 0x02, 0x42, 0xb2, 0x0a, 0xf3, 0x42, 0x59, 0x90, 0xac, }, }, class: WitnessV0PubKeyHashTy, pkScript: []byte{ // OP_0 0x00, // OP_DATA_20 0x14, // <20-byte pubkey hash> 0x1d, 0x7c, 0xd6, 0xc7, 0x5c, 0x2e, 0x86, 0xf4, 0xcb, 0xf9, 0x8e, 0xae, 0xd2, 0x21, 0xb3, 0x0b, 0xd9, 0xa0, 0xb9, 0x28, }, }, // Invalid v0 P2WPKH - same as above but missing a byte on the // public key. { name: "invalid P2WPKH witness", sigScript: nil, witness: [][]byte{ // Signature is not needed to re-derive the // pkScript. {}, // Malformed compressed pubkey. { 0x03, 0x82, 0x62, 0xa6, 0xc6, 0xce, 0xc9, 0x3c, 0x2d, 0x3e, 0xcd, 0x6c, 0x60, 0x72, 0xef, 0xea, 0x86, 0xd0, 0x2f, 0xf8, 0xe3, 0x32, 0x8b, 0xbd, 0x02, 0x42, 0xb2, 0x0a, 0xf3, 0x42, 0x59, 0x90, }, }, class: WitnessV0PubKeyHashTy, pkScript: nil, }, } for _, test := range tests { t.Run(test.name, func(t *testing.T) { valid := test.pkScript != nil pkScript, err := ComputePkScript( test.sigScript, test.witness, ) if err != nil && valid { t.Fatalf("unable to compute pkScript: %v", err) } if !valid { return } if pkScript.Class() != test.class { t.Fatalf("expected pkScript of type %v, got %v", test.class, pkScript.Class()) } if !bytes.Equal(pkScript.Script(), test.pkScript) { t.Fatalf("expected pkScript=%x, got pkScript=%x", test.pkScript, pkScript.Script()) } }) } }