fn merge_ec_signature()

in src/crypto/mod.rs [50:67]

• 10 lines of code
• 1 McCabe index (conditional complexity)

fn merge_ec_signature(bytes_r: &[u8], bytes_s: &[u8], key_length: usize) -> Vec<u8> {
    assert!(bytes_r.len() <= key_length);
    assert!(bytes_s.len() <= key_length);

    let mut signature_bytes = vec![0u8; key_length * 2];

    // This is big-endian encoding so padding might be added at the start if the factor is
    // too short.
    let offset_copy = key_length - bytes_r.len();
    signature_bytes[offset_copy..offset_copy + bytes_r.len()].copy_from_slice(bytes_r);

    // This is big-endian encoding so padding might be added at the start if the factor is
    // too short.
    let offset_copy = key_length - bytes_s.len() + key_length;
    signature_bytes[offset_copy..offset_copy + bytes_s.len()].copy_from_slice(bytes_s);

    signature_bytes
}