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rust-secp256k1-unsafe-fast
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Merge pull request #23 from TheBlueMatt/master 

Fix fuzztarget ECDH to be symmetric
This commit is contained in:
Andrew Poelstra 2018-04-17 13:13:29 +00:00 committed by GitHub
parent b45c3804e4 730da80f0b
commit 02d8a5180c
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 3 deletions
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11
src/ffi.rs
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@ -327,7 +327,7 @@ mod fuzz_dummy {
assert!(!cx.is_null() && (*cx).0 as u32 & !(SECP256K1_START_NONE | SECP256K1_START_VERIFY | SECP256K1_START_SIGN) == 0);
match in_len {
33 => {
if *input != 2 && *input != 3 {
if (*input.offset(1) > 0x7f && *input != 2) || (*input.offset(1) <= 0x7f && *input != 3) {
0
} else {
ptr::copy(input.offset(1), (*pk).0[0..32].as_mut_ptr(), 32);
@ -642,8 +642,17 @@ mod fuzz_dummy {
assert!(!cx.is_null() && (*cx).0 as u32 & !(SECP256K1_START_NONE | SECP256K1_START_VERIFY | SECP256K1_START_SIGN) == 0);
assert!((*cx).0 as u32 & SECP256K1_START_SIGN == SECP256K1_START_SIGN);
if secp256k1_ec_seckey_verify(cx, scalar) != 1 { return 0; }
let mut scalar_prefix = [0; 16];
ptr::copy(scalar, scalar_prefix[..].as_mut_ptr(), 16);
if (*point).0[0..16] > scalar_prefix[0..16] {
(*out).0[0..16].copy_from_slice(&(*point).0[0..16]);
ptr::copy(scalar, (*out).0[16..32].as_mut_ptr(), 16);
} else {
ptr::copy(scalar, (*out).0[0..16].as_mut_ptr(), 16);
(*out).0[16..32].copy_from_slice(&(*point).0[0..16]);
}
(*out).0[16] = 0x00; // result should always be a valid secret key
1
}