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rust-secp256k1-unsafe-fast
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Merge pull request #24 from TheBlueMatt/master 

impl fuzztarget secp256k1_ecdsa_signature_serialize_der
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Andrew Poelstra 2018-06-04 18:46:58 +00:00 committed by GitHub
parent e3b08c2f5e 207ccdf803
commit 94807d9d29
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1 changed files with 33 additions and 1 deletions
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34
src/ffi.rs
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@ -395,10 +395,42 @@ mod fuzz_dummy {
unimplemented!();
}
/// Copies up to 72 bytes into output from sig
pub unsafe fn secp256k1_ecdsa_signature_serialize_der(cx: *const Context, output: *mut c_uchar,
out_len: *mut size_t, sig: *const Signature)
-> c_int {
unimplemented!();
assert!(!cx.is_null() && (*cx).0 as u32 & !(SECP256K1_START_NONE | SECP256K1_START_VERIFY | SECP256K1_START_SIGN) == 0);
let mut len_r = 33;
if *(*sig).0.as_ptr().offset(0) < 0x80 {
len_r -= 1;
}
let mut len_s = 33;
if *(*sig).0.as_ptr().offset(32) < 0x80 {
len_s -= 1;
}
assert!(*out_len >= (6 + len_s + len_r) as size_t);
*output.offset(0) = 0x30;
*output.offset(1) = 4 + len_r + len_s;
*output.offset(2) = 0x02;
*output.offset(3) = len_r;
if len_r == 33 {
*output.offset(4) = 0;
ptr::copy((*sig).0[..].as_ptr(), output.offset(5), 32);
} else {
ptr::copy((*sig).0[..].as_ptr(), output.offset(4), 32);
}
*output.offset(4 + len_r as isize) = 0x02;
*output.offset(5 + len_r as isize) = len_s;
if len_s == 33 {
*output.offset(6 + len_r as isize) = 0;
ptr::copy((*sig).0[..].as_ptr().offset(32), output.offset(7 + len_r as isize), 32);
} else {
ptr::copy((*sig).0[..].as_ptr().offset(32), output.offset(6 + len_r as isize), 32);
}
1
}
/// Copies sig to output64