Obfuscator not using full 256 bits of each byte

[DawnStream]

When obfuscating the key and when decrypting it, you take the string representation of the sha256 digest. This causes the obfuscator used to be constructed from only [1-10,a-e], and not the full range of the byte values. This guarantee that some bits are never changed (e.g. the MSB, as ascii calues are always less than 127).
I suggest using the original digest value and not "format" it to string value.

[ben-j69]

Hello @DawnStream ,
thanks for the report, feel free to submit the PR to improve the lib ;)

[DawnStream]

@ben-j69 Just created a PR to fix this. Thanks for this plugin!

[ben-j69]

Thanks @DawnStream for the PR : #60