v1.2.1 - Padding bug fix

Fix for #14

v1.2.0 - Add *WithTweak methods

Both ff1 and ff3 packages now have two new (optional) functions, EncryptWithTweak and DecryptWithTweak, which allow you to pass in a tweak to override the current Cipher's tweak for a given piece of data to operate on.

This aids in realistic FPE scenarios like tokenizing multiple credit card numbers which will have different tweaks for each number, but you want to use the same key (and therefore re-use a single Cipher instance).

The existing Encrypt and Decrypt functions for both packages remain the same, so this API changes is non-breaking.

v1.1.1 - Trailing zeros bug fix

See #10

v1.1.0 - Performance Improvements

FF1 and FF3 code has been optimized to reduce extraneous allocations and improve overall performance.

See #3 (thanks @cstockton) and #8 for full details

MINOR BREAKING CHANGE TO BOTH:

ff1 and ff3 NewCipher now return a Cipher rather than *Cipher and methods are now on value receivers instead of pointer receivers for consistency. Because of Go's transparent indirection and since the struct fields are not exported, this shouldn't cause issues for most practical uses, as the only way to interact with the cipher is using Encrypt and Decrypt, which remain unchanged.

This was done because in situations where many NewCipher calls must be made (ex. tweak is different for each piece of data), then using value semantics causes less allocations.

v1.0.0 - Initial Release

This marks the first major release of fpe.

Features include:

• FF1 and FF3 algorithms implementations
• Up to base36 support using math/big standard package