revm_precompile/
secp256r1.rs

1//! # EIP-7212 secp256r1 Precompile
2//!
3//! This module implements the [RIP-7212](https://github.com/ethereum/RIPs/blob/master/RIPS/rip-7212.md) precompile for
4//! secp256r1 curve support.
5//!
6//! The main purpose of this precompile is to verify ECDSA signatures that use the secp256r1, or
7//! P256 elliptic curve. The [`P256VERIFY`] const represents the implementation of this precompile,
8//! with the address that it is currently deployed at.
9use crate::{
10    u64_to_address, PrecompileError, PrecompileOutput, PrecompileResult, PrecompileWithAddress,
11};
12use p256::ecdsa::{signature::hazmat::PrehashVerifier, Signature, VerifyingKey};
13use primitives::{Bytes, B256};
14
15/// Address of secp256r1 precompile.
16pub const P256VERIFY_ADDRESS: u64 = 256;
17
18/// Base gas fee for secp256r1 p256verify operation.
19pub const P256VERIFY_BASE_GAS_FEE: u64 = 3450;
20
21/// Returns the secp256r1 precompile with its address.
22pub fn precompiles() -> impl Iterator<Item = PrecompileWithAddress> {
23    [P256VERIFY].into_iter()
24}
25
26/// [RIP-7212](https://github.com/ethereum/RIPs/blob/master/RIPS/rip-7212.md#specification) secp256r1 precompile.
27pub const P256VERIFY: PrecompileWithAddress =
28    PrecompileWithAddress(u64_to_address(P256VERIFY_ADDRESS), p256_verify);
29
30/// secp256r1 precompile logic. It takes the input bytes sent to the precompile
31/// and the gas limit. The output represents the result of verifying the
32/// secp256r1 signature of the input.
33///
34/// The input is encoded as follows:
35///
36/// | signed message hash |  r  |  s  | public key x | public key y |
37/// | :-----------------: | :-: | :-: | :----------: | :----------: |
38/// |          32         | 32  | 32  |     32       |      32      |
39pub fn p256_verify(input: &Bytes, gas_limit: u64) -> PrecompileResult {
40    if P256VERIFY_BASE_GAS_FEE > gas_limit {
41        return Err(PrecompileError::OutOfGas);
42    }
43    let result = if verify_impl(input).is_some() {
44        B256::with_last_byte(1).into()
45    } else {
46        Bytes::new()
47    };
48    Ok(PrecompileOutput::new(P256VERIFY_BASE_GAS_FEE, result))
49}
50
51/// Returns `Some(())` if the signature included in the input byte slice is
52/// valid, `None` otherwise.
53pub fn verify_impl(input: &[u8]) -> Option<()> {
54    if input.len() != 160 {
55        return None;
56    }
57
58    // msg signed (msg is already the hash of the original message)
59    let msg = &input[..32];
60    // r, s: signature
61    let sig = &input[32..96];
62    // x, y: public key
63    let pk = &input[96..160];
64
65    // Prepend 0x04 to the public key: uncompressed form
66    let mut uncompressed_pk = [0u8; 65];
67    uncompressed_pk[0] = 0x04;
68    uncompressed_pk[1..].copy_from_slice(pk);
69
70    // Can fail only if the input is not exact length.
71    let signature = Signature::from_slice(sig).ok()?;
72    // Can fail if the input is not valid, so we have to propagate the error.
73    let public_key = VerifyingKey::from_sec1_bytes(&uncompressed_pk).ok()?;
74
75    public_key.verify_prehash(msg, &signature).ok()
76}
77
78#[cfg(test)]
79mod test {
80    use super::*;
81    use crate::PrecompileError;
82    use primitives::hex::FromHex;
83    use rstest::rstest;
84
85    #[rstest]
86    // Test vectors from https://github.com/daimo-eth/p256-verifier/tree/master/test-vectors
87    #[case::ok_1("4cee90eb86eaa050036147a12d49004b6b9c72bd725d39d4785011fe190f0b4da73bd4903f0ce3b639bbbf6e8e80d16931ff4bcf5993d58468e8fb19086e8cac36dbcd03009df8c59286b162af3bd7fcc0450c9aa81be5d10d312af6c66b1d604aebd3099c618202fcfe16ae7770b0c49ab5eadf74b754204a3bb6060e44eff37618b065f9832de4ca6ca971a7a1adc826d0f7c00181a5fb2ddf79ae00b4e10e", true)]
88    #[case::ok_2("3fec5769b5cf4e310a7d150508e82fb8e3eda1c2c94c61492d3bd8aea99e06c9e22466e928fdccef0de49e3503d2657d00494a00e764fd437bdafa05f5922b1fbbb77c6817ccf50748419477e843d5bac67e6a70e97dde5a57e0c983b777e1ad31a80482dadf89de6302b1988c82c29544c9c07bb910596158f6062517eb089a2f54c9a0f348752950094d3228d3b940258c75fe2a413cb70baa21dc2e352fc5", true)]
89    #[case::ok_3("e775723953ead4a90411a02908fd1a629db584bc600664c609061f221ef6bf7c440066c8626b49daaa7bf2bcc0b74be4f7a1e3dcf0e869f1542fe821498cbf2de73ad398194129f635de4424a07ca715838aefe8fe69d1a391cfa70470795a80dd056866e6e1125aff94413921880c437c9e2570a28ced7267c8beef7e9b2d8d1547d76dfcf4bee592f5fefe10ddfb6aeb0991c5b9dbbee6ec80d11b17c0eb1a", true)]
90    #[case::ok_4("b5a77e7a90aa14e0bf5f337f06f597148676424fae26e175c6e5621c34351955289f319789da424845c9eac935245fcddd805950e2f02506d09be7e411199556d262144475b1fa46ad85250728c600c53dfd10f8b3f4adf140e27241aec3c2da3a81046703fccf468b48b145f939efdbb96c3786db712b3113bb2488ef286cdcef8afe82d200a5bb36b5462166e8ce77f2d831a52ef2135b2af188110beaefb1", true)]
91    #[case::ok_5("858b991cfd78f16537fe6d1f4afd10273384db08bdfc843562a22b0626766686f6aec8247599f40bfe01bec0e0ecf17b4319559022d4d9bf007fe929943004eb4866760dedf31b7c691f5ce665f8aae0bda895c23595c834fecc2390a5bcc203b04afcacbb4280713287a2d0c37e23f7513fab898f2c1fefa00ec09a924c335d9b629f1d4fb71901c3e59611afbfea354d101324e894c788d1c01f00b3c251b2", true)]
92    #[case::fail_wrong_msg_1("3cee90eb86eaa050036147a12d49004b6b9c72bd725d39d4785011fe190f0b4da73bd4903f0ce3b639bbbf6e8e80d16931ff4bcf5993d58468e8fb19086e8cac36dbcd03009df8c59286b162af3bd7fcc0450c9aa81be5d10d312af6c66b1d604aebd3099c618202fcfe16ae7770b0c49ab5eadf74b754204a3bb6060e44eff37618b065f9832de4ca6ca971a7a1adc826d0f7c00181a5fb2ddf79ae00b4e10e", false)]
93    #[case::fail_wrong_msg_2("afec5769b5cf4e310a7d150508e82fb8e3eda1c2c94c61492d3bd8aea99e06c9e22466e928fdccef0de49e3503d2657d00494a00e764fd437bdafa05f5922b1fbbb77c6817ccf50748419477e843d5bac67e6a70e97dde5a57e0c983b777e1ad31a80482dadf89de6302b1988c82c29544c9c07bb910596158f6062517eb089a2f54c9a0f348752950094d3228d3b940258c75fe2a413cb70baa21dc2e352fc5", false)]
94    #[case::fail_wrong_msg_3("f775723953ead4a90411a02908fd1a629db584bc600664c609061f221ef6bf7c440066c8626b49daaa7bf2bcc0b74be4f7a1e3dcf0e869f1542fe821498cbf2de73ad398194129f635de4424a07ca715838aefe8fe69d1a391cfa70470795a80dd056866e6e1125aff94413921880c437c9e2570a28ced7267c8beef7e9b2d8d1547d76dfcf4bee592f5fefe10ddfb6aeb0991c5b9dbbee6ec80d11b17c0eb1a", false)]
95    #[case::fail_wrong_msg_4("c5a77e7a90aa14e0bf5f337f06f597148676424fae26e175c6e5621c34351955289f319789da424845c9eac935245fcddd805950e2f02506d09be7e411199556d262144475b1fa46ad85250728c600c53dfd10f8b3f4adf140e27241aec3c2da3a81046703fccf468b48b145f939efdbb96c3786db712b3113bb2488ef286cdcef8afe82d200a5bb36b5462166e8ce77f2d831a52ef2135b2af188110beaefb1", false)]
96    #[case::fail_wrong_msg_5("958b991cfd78f16537fe6d1f4afd10273384db08bdfc843562a22b0626766686f6aec8247599f40bfe01bec0e0ecf17b4319559022d4d9bf007fe929943004eb4866760dedf31b7c691f5ce665f8aae0bda895c23595c834fecc2390a5bcc203b04afcacbb4280713287a2d0c37e23f7513fab898f2c1fefa00ec09a924c335d9b629f1d4fb71901c3e59611afbfea354d101324e894c788d1c01f00b3c251b2", false)]
97    #[case::fail_short_input_1("4cee90eb86eaa050036147a12d49004b6a", false)]
98    #[case::fail_short_input_2("4cee90eb86eaa050036147a12d49004b6a958b991cfd78f16537fe6d1f4afd10273384db08bdfc843562a22b0626766686f6aec8247599f40bfe01bec0e0ecf17b4319559022d4d9bf007fe929943004eb4866760dedf319", false)]
99    #[case::fail_long_input("4cee90eb86eaa050036147a12d49004b6b9c72bd725d39d4785011fe190f0b4da73bd4903f0ce3b639bbbf6e8e80d16931ff4bcf5993d58468e8fb19086e8cac36dbcd03009df8c59286b162af3bd7fcc0450c9aa81be5d10d312af6c66b1d604aebd3099c618202fcfe16ae7770b0c49ab5eadf74b754204a3bb6060e44eff37618b065f9832de4ca6ca971a7a1adc826d0f7c00181a5fb2ddf79ae00b4e10e00", false)]
100    #[case::fail_invalid_sig("4cee90eb86eaa050036147a12d49004b6b9c72bd725d39d4785011fe190f0b4dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff4aebd3099c618202fcfe16ae7770b0c49ab5eadf74b754204a3bb6060e44eff37618b065f9832de4ca6ca971a7a1adc826d0f7c00181a5fb2ddf79ae00b4e10e", false)]
101    #[case::fail_invalid_pubkey("4cee90eb86eaa050036147a12d49004b6b9c72bd725d39d4785011fe190f0b4da73bd4903f0ce3b639bbbf6e8e80d16931ff4bcf5993d58468e8fb19086e8cac36dbcd03009df8c59286b162af3bd7fcc0450c9aa81be5d10d312af6c66b1d6000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", false)]
102    fn test_sig_verify(#[case] input: &str, #[case] expect_success: bool) {
103        let input = Bytes::from_hex(input).unwrap();
104        let target_gas = 3_500u64;
105        let outcome = p256_verify(&input, target_gas).unwrap();
106        assert_eq!(outcome.gas_used, 3_450u64);
107        let expected_result = if expect_success {
108            B256::with_last_byte(1).into()
109        } else {
110            Bytes::new()
111        };
112        assert_eq!(outcome.bytes, expected_result);
113    }
114
115    #[rstest]
116    fn test_not_enough_gas_errors() {
117        let input = Bytes::from_hex("4cee90eb86eaa050036147a12d49004b6b9c72bd725d39d4785011fe190f0b4da73bd4903f0ce3b639bbbf6e8e80d16931ff4bcf5993d58468e8fb19086e8cac36dbcd03009df8c59286b162af3bd7fcc0450c9aa81be5d10d312af6c66b1d604aebd3099c618202fcfe16ae7770b0c49ab5eadf74b754204a3bb6060e44eff37618b065f9832de4ca6ca971a7a1adc826d0f7c00181a5fb2ddf79ae00b4e10e").unwrap();
118        let target_gas = 2_500u64;
119        let result = p256_verify(&input, target_gas);
120
121        assert!(result.is_err());
122        assert_eq!(result.err(), Some(PrecompileError::OutOfGas));
123    }
124
125    #[rstest]
126    #[case::ok_1("b5a77e7a90aa14e0bf5f337f06f597148676424fae26e175c6e5621c34351955289f319789da424845c9eac935245fcddd805950e2f02506d09be7e411199556d262144475b1fa46ad85250728c600c53dfd10f8b3f4adf140e27241aec3c2da3a81046703fccf468b48b145f939efdbb96c3786db712b3113bb2488ef286cdcef8afe82d200a5bb36b5462166e8ce77f2d831a52ef2135b2af188110beaefb1", true)]
127    #[case::fail_1("b5a77e7a90aa14e0bf5f337f06f597148676424fae26e175c6e5621c34351955289f319789da424845c9eac935245fcddd805950e2f02506d09be7e411199556d262144475b1fa46ad85250728c600c53dfd10f8b3f4adf140e27241aec3c2daaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaef8afe82d200a5bb36b5462166e8ce77f2d831a52ef2135b2af188110beaefb1", false)]
128    fn test_verify_impl(#[case] input: &str, #[case] expect_success: bool) {
129        let input = Bytes::from_hex(input).unwrap();
130        let result = verify_impl(&input);
131
132        assert_eq!(result.is_some(), expect_success);
133    }
134}
revm_precompile/secp256r1.rs

revm_precompile/
secp256r1.rs
