def mpi_to_long(mpi_byte_string):
"""
Converts an OpenSSL-format MPI Bignum byte string into a long.
:param mpi_byte_string:
OpenSSL-format MPI Bignum byte string.
:returns:
Long value.
"""
#Make sure this is a positive number
assert (ord(mpi_byte_string[4]) & 0x80) == 0
byte_array = bytes_to_bytearray(mpi_byte_string[4:])
return bytearray_to_long(byte_array)
def bytes_to_long_original(byte_string):
"""
Convert a byte string to a long integer::
bytes_to_long(byte_string) : long
This is (essentially) the inverse of long_to_bytes().
:param byte_string:
A byte string.
:returns:
Long.
"""
byte_array = bytes_to_bytearray(byte_string)
return bytearray_to_long(byte_array)
def generate_random_long(low, high):
"""
Generates a random long integer.
:param low:
Low
:param high:
High
:returns:
Random long integer value.
"""
if low >= high:
raise ValueError("High must be greater than low.")
num_bits = bit_count(high)
num_bytes = byte_count(high)
last_bits = num_bits % 8
while 1:
byte_array = generate_random_bytearray(num_bytes)
if last_bits:
byte_array[0] = byte_array[0] % (1 << last_bits)
n = bytearray_to_long(byte_array)
if n >= low and n < high:
return n
