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# oscrypto.util API Documentation
The *oscrypto.util* submodule implements supporting cryptographic functionality.
The following functions comprise the public API:
- [`rand_bytes()`](#rand_bytes-function)
- [`constant_compare()`](#constant_compare-function)
### `rand_bytes()` function
> ```python
> def rand_bytes(length):
> """
> :param length:
> The desired number of bytes
>
> :raises:
> ValueError - when any of the parameters contain an invalid value
> TypeError - when any of the parameters are of the wrong type
> OSError - when an error is returned by the OS crypto library
>
> :return:
> A byte string
> """
> ```
>
> Returns a number of random bytes suitable for cryptographic purposes
### `constant_compare()` function
> ```python
> def constant_compare(a, b):
> """
> :param a:
> The first byte string
>
> :param b:
> The second byte string
>
> :return:
> A boolean if the two byte strings are equal
> """
> ```
>
> Compares two byte strings in constant time to see if they are equal
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