Crypto.Number.Serialize

fast serialization primitives for integer

Documentation

i2osp :: Integer -> ByteString

i2osp converts a positive integer into a byte string

os2ip :: ByteString -> Integer

os2ip converts a byte string into a positive integer

i2ospOf :: Int -> Integer -> Maybe ByteString

just like i2osp, but take an extra parameter for size. if the number is too big to fit in len bytes, nothing is returned otherwise the number is padded with 0 to fit the len required.

FIXME: use unsafeCreate to fill the bytestring

i2ospOf_ :: Int -> Integer -> ByteString

just like i2ospOf except that it doesn't expect a failure: i.e. an integer larger than the number of output bytes requested

for example if you just took a modulo of the number that represent the size (example the RSA modulo n).

lengthBytes :: Integer -> Int

returns the number of bytes to store an integer with i2osp

with integer-simple, this function is really slow.