Function IsCompressedPubKey

src/script/interpreter.cpp:85–95

}

bool static IsCompressedPubKey(const valtype &vchPubKey) {
    if (vchPubKey.size() != CPubKey::COMPRESSED_PUBLIC_KEY_SIZE) {
        //  Non-canonical public key: invalid length for compressed key
        return false;
    }
    if (vchPubKey[0] != 0x02 && vchPubKey[0] != 0x03) {
        //  Non-canonical public key: invalid prefix for compressed key
        return false;
    }
    return true;
}

/**
 * A canonical signature exists of: <30> <total len> <02> <len R> <R> <02> <len S> <S> <hashtype>