Function bn2vch

test/functional/test_framework/script.py:43–52

Convert number to bitcoin-specific little endian format.

(v)

    return ripemd160(sha256(s))

def bn2vch(v):
    """Convert number to bitcoin-specific little endian format."""
    # We need v.bit_length() bits, plus a sign bit for every nonzero number.
    n_bits = v.bit_length() + (v != 0)
    # The number of bytes for that is:
    n_bytes = (n_bits + 7) // 8
    # Convert number to absolute value + sign in top bit.
    encoded_v = 0 if v == 0 else abs(v) | ((v < 0) << (n_bytes * 8 - 1))
    # Serialize to bytes
    return encoded_v.to_bytes(n_bytes, 'little')

class CScriptOp(int):
    """A single script opcode"""