nour 1.0.0

High-performance Bitcoin SV toolkit for transactions, scripts, P2P, and wallets
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

//! Pay-to-Public-Key-Hash (P2PKH) transaction scripts for Bitcoin SV.
///
/// Standard for "sending to an address"; creates/checks lock/unlock scripts.
/// Note: For P2SH, see BIP-16.
use crate::script::op_codes::{OP_CHECKSIG, OP_DUP, OP_EQUALVERIFY, OP_HASH160, OP_PUSH};
use crate::script::{Script, next_op};
use crate::util::{Error, Hash160, Result};
/// Creates P2PKH lock script (DUP HASH160 [hash] EQUALVERIFY CHECKSIG).
#[must_use]
#[inline]
pub fn create_lock_script(address: &Hash160) -> Script {
    let mut script = Script::new();
    script.append(OP_DUP);
    script.append(OP_HASH160);
    script.append(OP_PUSH + 20);
    script.append_slice(&address.0);
    script.append(OP_EQUALVERIFY);
    script.append(OP_CHECKSIG);
    script
}
/// Creates P2PKH unlock script (push sig + pubkey).
#[must_use]
#[inline]
pub fn create_unlock_script(sig: &[u8], public_key: &[u8]) -> Script {
    let mut script = Script::new();
    script.append_data(sig).unwrap();
    script.append_data(public_key).unwrap();
    script
}
/// Checks if script is P2PKH lock (len=25, ops match).
#[must_use]
#[inline]
pub fn check_lock_script(lock_script: &[u8]) -> bool {
    lock_script.len() == 25
        && lock_script[0] == OP_DUP
        && lock_script[1] == OP_HASH160
        && lock_script[2] == OP_PUSH + 20
        && lock_script[23] == OP_EQUALVERIFY
        && lock_script[24] == OP_CHECKSIG
}
/// Checks if script is P2PKH unlock (sig push 71-73B + pubkey 33/65B).
#[must_use]
#[inline]
pub fn check_unlock_script(unlock_script: &[u8]) -> bool {
    if unlock_script.is_empty() {
        return false;
    }
    let sig_len = unlock_script[0];
    if sig_len < OP_PUSH + 71 || sig_len > OP_PUSH + 73 {
        return false;
    }
    let i = next_op(0, unlock_script);
    if i >= unlock_script.len() {
        return false;
    }
    let pk_len = unlock_script[i];
    if pk_len != OP_PUSH + 33 && pk_len != OP_PUSH + 65 {
        return false;
    }
    next_op(i, unlock_script) == unlock_script.len()
}
/// Checks if P2PKH lock matches hash160.
#[must_use]
#[inline]
pub fn check_lock_script_addr(hash160: &Hash160, lock_script: &[u8]) -> bool {
    check_lock_script(lock_script) && lock_script[3..23] == hash160.0
}
/// Checks if P2PKH unlock matches pubkey.
#[must_use]
#[inline]
pub fn check_unlock_script_addr(pubkey: &[u8], unlock_script: &[u8]) -> bool {
    if !check_unlock_script(unlock_script) {
        return false;
    }
    let i = next_op(0, unlock_script);
    unlock_script[i + 1..] == *pubkey
}
/// Extracts pubkey from P2PKH unlock.
#[must_use]
pub fn extract_pubkey(unlock_script: &[u8]) -> Result<Vec<u8>> {
    if !check_unlock_script(unlock_script) {
        return Err(Error::BadData("Not P2PKH unlock".to_string()));
    }
    let i = next_op(0, unlock_script);
    Ok(unlock_script[i + 1..].to_vec())
}
/// Extracts hash160 from P2PKH lock.
#[must_use]
pub fn extract_pubkeyhash(lock_script: &[u8]) -> Result<Hash160> {
    if !check_lock_script(lock_script) {
        return Err(Error::BadData("Not P2PKH lock".to_string()));
    }
    let mut hash160 = Hash160([0; 20]);
    hash160.0.copy_from_slice(&lock_script[3..23]);
    Ok(hash160)
}
#[cfg(test)]
mod tests {
    use super::*;
    use crate::script::op_codes::OP_1;
    #[test]
    fn check_lock_script_test() {
        let mut s = Script::new();
        assert!(!check_lock_script(&s.0));
        s.append(OP_DUP);
        s.append(OP_HASH160);
        s.append(OP_PUSH + 20);
        s.append_slice(&[0; 20]);
        s.append(OP_EQUALVERIFY);
        s.append(OP_CHECKSIG);
        assert!(check_lock_script(&s.0));
        s.append(OP_1);
        assert!(!check_lock_script(&s.0));
    }
    #[test]
    fn check_unlock_script_test() {
        assert!(!check_unlock_script(&Script::new().0));
        let mut sig71pkh33 = Script::new();
        sig71pkh33.append(OP_PUSH + 71);
        sig71pkh33.append_slice(&[0; 71]);
        assert!(!check_unlock_script(&sig71pkh33.0));
        sig71pkh33.append(OP_PUSH + 33);
        sig71pkh33.append_slice(&[0; 33]);
        assert!(check_unlock_script(&sig71pkh33.0));
        sig71pkh33.append(OP_1);
        assert!(!check_unlock_script(&sig71pkh33.0));
        let mut sig73pkh65 = Script::new();
        sig73pkh65.append(OP_PUSH + 73);
        sig73pkh65.append_slice(&[0; 73]);
        sig73pkh65.append(OP_PUSH + 65);
        sig73pkh65.append_slice(&[0; 65]);
        assert!(check_unlock_script(&sig73pkh65.0));
        let mut sig72pkh30 = Script::new();
        sig72pkh30.append(OP_PUSH + 72);
        sig72pkh30.append_slice(&[0; 72]);
        sig72pkh30.append(OP_PUSH + 30);
        sig72pkh30.append_slice(&[0; 30]);
        assert!(!check_unlock_script(&sig72pkh30.0));
    }
    #[test]
    fn check_lock_script_addr_test() {
        let s = create_lock_script(&Hash160([5; 20]));
        assert!(check_lock_script_addr(&Hash160([5; 20]), &s.0));
    }
    #[test]
    fn check_unlock_script_addr_test() {
        let mut s = Script::new();
        s.append(OP_PUSH + 71);
        s.append_slice(&[5; 71]);
        s.append(OP_PUSH + 65);
        s.append_slice(&[6; 65]);
        assert!(check_unlock_script_addr(&[6; 65], &s.0));
        assert!(!check_unlock_script_addr(&[7; 65], &s.0));
    }
}