Update version prefix

Update version prefix

Make IdentifyVersion standalone

Fix the hash functions

Make sure they're all different by adding a unique prefix.

Implement TestKeyGen

Add VerifyEpochSecretKeyDeterministic (#110)

Merge pull request #109 from shutter-network/crypto-fixes

Crypto fixes

Merge pull request #107 from konradkonrad/dev/decrypt_blocks

Make `DecryptBlocks` public

Add LagrangeCoeffs function to speedup secret key generation

This can be used to speedup secret key generation for multiple epoch keys, if
we do have shares from the same set of keypers for those epochs.

Merge pull request #100 from shutter-network/jannik/bytes-epochid

Use bytes as epoch id