sign_hash rfc6979

def sign_hash(hash,privkey):
    try:
        import ecdsa
        k_value = int(ecdsa.rfc6979.generate_k(ecdsa.ecdsa.ellipticcurve.Point(ecdsa.ecdsa.curve_secp256k1,ecdsa.ecdsa._Gx,ecdsa.ecdsa._Gy,ecdsa.ecdsa._r),int(privkey,16),hashlib.sha256,hash))
    except:
        k_value = int(double_sha256(os.urandom(32)),16)
    r = int(str(privkey_to_pubkey(k_value,output_compressed=True))[2:],16) % N_ORDER
    r = str(hex(r)).replace("0x","").replace("L","").zfill(64)
    assert len(r) == 64
    s = ((int(hash,16) + (int(r,16) * int(privkey,16))) * (ec_modular_inverse(k_value,N_ORDER))) % N_ORDER
    s = str(hex(s)).replace("0x","").replace("L","").zfill(64)
    assert len(s) == 64
    if int(r[:2],16) > 127:
        r = str(str("00") + str(r))
        assert len(r) == 66
    if int(s[:2],16) > 127:
        s = str(str("00") + str(s))
        assert len(s) == 66
    if len(r) == 66:
        r_prefix = str("0221")
    else:
        r_prefix = str("0220")
    if len(s) == 66:
        s_prefix = str("0221")
    else:
        s_prefix = str("0220")
    finalsig = r_prefix + r + s_prefix + s
    len_byte = str(hex(int(len(finalsig) // 2))).replace("0x","").replace("L","").zfill(2)
    assert len(len_byte) == 2
    finalsig = str("30") + len_byte + finalsig  # Does NOT include 0x01 SIGHASH_ALL postfix
    return str(finalsig)