Enum KeySigPair

Source

pub enum KeySigPair {
    Ecdsa(PublicKey, EcdsaSig),
    Schnorr(XOnlyPublicKey, SchnorrSig),
}

Expand description

A type for representing signatures supported as of bitcoin core 22.0

Variants§

§

Ecdsa(PublicKey, EcdsaSig)

A Full public key and corresponding Ecdsa signature

§

Schnorr(XOnlyPublicKey, SchnorrSig)

A x-only key and corresponding Schnorr signature

Implementations§

Source §

impl KeySigPair

Source

pub fn as_ecdsa(&self) -> Option<(PublicKey, EcdsaSig)>

Obtain a pair of (bitcoin::PublicKey, bitcoin::EcdsaSig) from KeySigPair

Examples found in repository ?

examples/verify_tx.rs (line 119)

27fn main() {
28    // tx `f27eba163c38ad3f34971198687a3f1882b7ec818599ffe469a8440d82261c98`
29    #[cfg_attr(feature="cargo-fmt", rustfmt_skip)]
30    let tx_bytes = vec![
31        0x01, 0x00, 0x00, 0x00, 0x02, 0xc5, 0x11, 0x1d, 0xb7, 0x93, 0x50, 0xc1,
32        0x70, 0x28, 0x41, 0x39, 0xe8, 0xe3, 0x4e, 0xb0, 0xed, 0xba, 0x64, 0x7b,
33        0x6c, 0x88, 0x7e, 0x9f, 0x92, 0x8f, 0xfd, 0x9b, 0x5c, 0x4a, 0x4b, 0x52,
34        0xd0, 0x01, 0x00, 0x00, 0x00, 0xda, 0x00, 0x47, 0x30, 0x44, 0x02, 0x20,
35        0x1c, 0xcc, 0x1b, 0xe9, 0xaf, 0x73, 0x4a, 0x10, 0x9f, 0x66, 0xfb, 0xed,
36        0xeb, 0x77, 0xb7, 0xa1, 0xf4, 0xb3, 0xc5, 0xff, 0x3d, 0x7f, 0x46, 0xf6,
37        0xde, 0x50, 0x69, 0xbb, 0x52, 0x7f, 0x26, 0x9d, 0x02, 0x20, 0x75, 0x37,
38        0x2f, 0x6b, 0xd7, 0x0c, 0xf6, 0x45, 0x7a, 0xc7, 0x0e, 0x82, 0x6f, 0xc6,
39        0xa7, 0x5b, 0xf7, 0xcf, 0x10, 0x8c, 0x92, 0xea, 0xcf, 0xfc, 0xb5, 0xd9,
40        0xfd, 0x77, 0x66, 0xa3, 0x58, 0xa9, 0x01, 0x48, 0x30, 0x45, 0x02, 0x21,
41        0x00, 0xfe, 0x82, 0x5b, 0xe1, 0xd5, 0xfd, 0x71, 0x67, 0x83, 0xf4, 0x55,
42        0xef, 0xe6, 0x6d, 0x61, 0x58, 0xff, 0xf8, 0xc3, 0x2b, 0x93, 0x1c, 0x5f,
43        0x3f, 0xf9, 0x8e, 0x06, 0x65, 0xa9, 0xfd, 0x8e, 0x64, 0x02, 0x20, 0x22,
44        0x01, 0x0f, 0xdb, 0x53, 0x8d, 0x0f, 0xa6, 0x8b, 0xd7, 0xf5, 0x20, 0x5d,
45        0xc1, 0xdf, 0xa6, 0xc4, 0x28, 0x1b, 0x7b, 0xb7, 0x6f, 0xc2, 0x53, 0xf7,
46        0x51, 0x4d, 0x83, 0x48, 0x52, 0x5f, 0x0d, 0x01, 0x47, 0x52, 0x21, 0x03,
47        0xd0, 0xbf, 0x26, 0x7c, 0x93, 0x78, 0xb3, 0x18, 0xb5, 0x80, 0xc2, 0x10,
48        0xa6, 0x78, 0xc4, 0xbb, 0x60, 0xd8, 0x44, 0x8b, 0x52, 0x0d, 0x21, 0x25,
49        0xa1, 0xbd, 0x37, 0x2b, 0x23, 0xae, 0xa6, 0x49, 0x21, 0x02, 0x11, 0xa8,
50        0x2a, 0xa6, 0x94, 0x63, 0x99, 0x0a, 0x6c, 0xdd, 0x48, 0x36, 0x76, 0x36,
51        0x6a, 0x44, 0xac, 0x3c, 0x98, 0xe7, 0x68, 0x54, 0x69, 0x84, 0x0b, 0xf2,
52        0x7a, 0x72, 0x4e, 0x40, 0x5a, 0x7e, 0x52, 0xae, 0xfd, 0xff, 0xff, 0xff,
53        0xea, 0x51, 0x1f, 0x33, 0x7a, 0xf5, 0x72, 0xbb, 0xad, 0xcd, 0x2e, 0x03,
54        0x07, 0x71, 0x62, 0x3a, 0x60, 0xcc, 0x71, 0x82, 0xad, 0x74, 0x53, 0x3e,
55        0xa3, 0x2f, 0xc8, 0xaa, 0x47, 0xd2, 0x0e, 0x71, 0x01, 0x00, 0x00, 0x00,
56        0xda, 0x00, 0x48, 0x30, 0x45, 0x02, 0x21, 0x00, 0xfa, 0x2b, 0xfb, 0x4d,
57        0x49, 0xb7, 0x6d, 0x9f, 0xb4, 0xc6, 0x9c, 0xc7, 0x8c, 0x36, 0xd2, 0x66,
58        0x92, 0x40, 0xe4, 0x57, 0x14, 0xc7, 0x19, 0x06, 0x85, 0xf7, 0xe5, 0x13,
59        0x94, 0xac, 0x4e, 0x37, 0x02, 0x20, 0x04, 0x95, 0x2c, 0xf7, 0x75, 0x1c,
60        0x45, 0x9d, 0x8a, 0x8b, 0x64, 0x76, 0x76, 0xce, 0x86, 0xf3, 0xbd, 0x69,
61        0xff, 0x39, 0x17, 0xcb, 0x99, 0x85, 0x14, 0xbd, 0x73, 0xb7, 0xfc, 0x04,
62        0xf6, 0x4c, 0x01, 0x47, 0x30, 0x44, 0x02, 0x20, 0x31, 0xae, 0x81, 0x1e,
63        0x35, 0x7e, 0x80, 0x00, 0x01, 0xc7, 0x57, 0x27, 0x7a, 0x22, 0x44, 0xa7,
64        0x2b, 0xd5, 0x9d, 0x0a, 0x00, 0xbe, 0xde, 0x49, 0x0a, 0x96, 0x12, 0x3e,
65        0x54, 0xce, 0x03, 0x4c, 0x02, 0x20, 0x05, 0xa2, 0x9f, 0x14, 0x30, 0x1e,
66        0x5e, 0x2f, 0xdc, 0x7c, 0xee, 0x49, 0x43, 0xec, 0x78, 0x78, 0xdf, 0x73,
67        0xde, 0x96, 0x27, 0x00, 0xa4, 0xd9, 0x43, 0x6b, 0xce, 0x24, 0xd6, 0xc3,
68        0xa3, 0x57, 0x01, 0x47, 0x52, 0x21, 0x03, 0x4e, 0x74, 0xde, 0x0b, 0x84,
69        0x3f, 0xaa, 0x60, 0x44, 0x3d, 0xf4, 0x76, 0xf1, 0xf6, 0x14, 0x4a, 0x5b,
70        0x0e, 0x76, 0x49, 0x9e, 0x8a, 0x26, 0x71, 0x07, 0x36, 0x5b, 0x32, 0xfa,
71        0xd5, 0xd0, 0xfd, 0x21, 0x03, 0xb4, 0xa6, 0x82, 0xc8, 0x6a, 0xd9, 0x06,
72        0x38, 0x8f, 0x99, 0x52, 0x76, 0xf0, 0x84, 0x92, 0x72, 0x3a, 0x8c, 0x5f,
73        0x32, 0x3c, 0x6a, 0xf6, 0x92, 0x97, 0x17, 0x40, 0x5d, 0x2e, 0x1b, 0x2f,
74        0x70, 0x52, 0xae, 0xfd, 0xff, 0xff, 0xff, 0x02, 0xa7, 0x32, 0x75, 0x01,
75        0x00, 0x00, 0x00, 0x00, 0x19, 0x76, 0xa9, 0x14, 0xfb, 0xf7, 0x76, 0xff,
76        0xeb, 0x3b, 0xb8, 0x89, 0xb2, 0x01, 0xa5, 0x3f, 0x5f, 0xb0, 0x55, 0x4f,
77        0x6e, 0x6f, 0xa2, 0x56, 0x88, 0xac, 0x19, 0x88, 0x56, 0x01, 0x00, 0x00,
78        0x00, 0x00, 0x17, 0xa9, 0x14, 0xd3, 0xb6, 0x1d, 0x34, 0xf6, 0x33, 0x7c,
79        0xd7, 0xc0, 0x28, 0xb7, 0x90, 0xb0, 0xcf, 0x43, 0xe0, 0x27, 0xd9, 0x1d,
80        0xe7, 0x87, 0x09, 0x5d, 0x07, 0x00,
81    ];
82    let transaction =
83        bitcoin::Transaction::consensus_decode(&mut &tx_bytes[..]).expect("decode transaction");
84
85    let spk_input_1 = bitcoin::Script::from(vec![
86        0xa9, 0x14, 0x92, 0x09, 0xa8, 0xf9, 0x0c, 0x58, 0x4b, 0xb5, 0x97, 0x4d, 0x58, 0x68, 0x72,
87        0x49, 0xe5, 0x32, 0xde, 0x59, 0xf4, 0xbc, 0x87,
88    ]);
89    let interpreter = miniscript::Interpreter::from_txdata(
90        &spk_input_1,
91        &transaction.input[0].script_sig,
92        &transaction.input[0].witness,
93        0,
94        0,
95        // TODO: Replace with actual hash
96        bitcoin::hashes::sha256::Hash::from_inner([0u8; 32]),
97    )
98    .unwrap();
99
100    let desc_string = interpreter.inferred_descriptor_string();
101    println!("Descriptor: {}", desc_string);
102    miniscript::Descriptor::<bitcoin::PublicKey>::from_str(&desc_string)
103        .expect("this descriptor can be reparsed with sanity checks passing");
104    interpreter
105        .inferred_descriptor()
106        .expect("we can use this method to do the above from_str for us");
107
108    // 1. Example one: learn which keys were used, not bothering
109    //    to verify the signatures (trusting that if they're on
110    //    the blockchain, standardness would've required they be
111    //    either valid or 0-length.
112    println!("\nExample one");
113    for elem in interpreter.iter_assume_sigs() {
114        // Don't bother checking signatures
115        match elem.expect("no evaluation error") {
116            miniscript::interpreter::SatisfiedConstraint::PublicKey { key_sig } => {
117                // Check that the signature is ecdsa sig
118                let (key, sig) = key_sig
119                    .as_ecdsa()
120                    .expect("Expected Ecdsa sig, found schnorr sig");
121                println!("Signed with {}: {}", key, sig);
122            }
123            _ => {}
124        }
125    }
126
127    // 2. Example two: verify the signatures to ensure that invalid
128    //    signatures are not treated as having participated in the script
129    let secp = secp256k1::Secp256k1::new();
130    // Sometimes it is necessary to have additional information to get the bitcoin::PublicKey
131    // from the MiniscriptKey which can supplied by `to_pk_ctx` parameter. For example,
132    // when calculating the script pubkey of a descriptor with xpubs, the secp context and
133    // child information maybe required.
134    let interpreter = miniscript::Interpreter::from_txdata(
135        &spk_input_1,
136        &transaction.input[0].script_sig,
137        &transaction.input[0].witness,
138        0,
139        0,
140        bitcoin::hashes::sha256::Hash::from_inner([0u8; 32]),
141    )
142    .unwrap();
143
144    // We can set prevouts to be empty list because this is a legacy transaction
145    // and this information is not required for sighash computation.
146    let prevouts = sighash::Prevouts::All::<TxOut>(&[]);
147
148    println!("\nExample two");
149    for elem in interpreter.iter(&secp, &transaction, 0, &prevouts) {
150        match elem.expect("no evaluation error") {
151            miniscript::interpreter::SatisfiedConstraint::PublicKey { key_sig } => {
152                let (key, sig) = key_sig.as_ecdsa().unwrap();
153                println!("Signed with {}: {}", key, sig);
154            }
155            _ => {}
156        }
157    }
158
159    // 3. Example three: same, but with the wrong signature hash, to demonstrate
160    //    what happens given an apparently invalid script
161    let secp = secp256k1::Secp256k1::new();
162    let message = secp256k1::Message::from_slice(&[0x01; 32][..]).expect("32-byte hash");
163    let interpreter = miniscript::Interpreter::from_txdata(
164        &spk_input_1,
165        &transaction.input[0].script_sig,
166        &transaction.input[0].witness,
167        0,
168        0,
169        bitcoin::hashes::sha256::Hash::from_inner([0u8; 32]),
170    )
171    .unwrap();
172
173    let iter = interpreter.iter_custom(Box::new(|key_sig: &KeySigPair| {
174        let (pk, ecdsa_sig) = key_sig.as_ecdsa().expect("Ecdsa Sig");
175        ecdsa_sig.hash_ty == bitcoin::EcdsaSighashType::All
176            && secp
177                .verify_ecdsa(&message, &ecdsa_sig.sig, &pk.inner)
178                .is_ok()
179    }));
180    println!("\nExample three");
181    for elem in iter {
182        let error = elem.expect_err("evaluation error");
183        println!("Evaluation error: {}", error);
184    }
185}