DigestBuilder should raise an exception when provided with invalid data

[trixpan]

as it currently is, DigestBuilder can be fed with bogus data, but depending on what gets fed it will raise all sort of Exceptions, requiring the consumer of the API to capture all sort of exceptions.

Examples:

feeding it with a empty strings results in ArrayIndexOutOfBoundsException

while feeding with an short hash string results in StringIndexOutOfBoundsException

It would be great if a particular exception was raised.

[jdvr]

I have verified that wrong inputs produce different java general exception.

I am going add an input check on builder method that produces an IllegalArgumentException when the hash is invalid.

What do you think @trixpan ?

new DigestBuilder().withHash("F42089EA34272885F0FB2D34E6911444C").build() 

java.lang.StringIndexOutOfBoundsException: String index out of range: 40

new DigestBuilder().withHash("").build() 
java.lang.ArrayIndexOutOfBoundsException: 0