Blowfish can have a key of variable length from one to 56 bytes.
The Byte variants need you to specify the key length, but the
Hex variants will use whatever length is provided in the key hex
string.
The block and IV are always 8 bytes long.
BLF_Hex
BLF_HexMode
BLF_Bytes
BLF_BytesMode
BLF_B64Mode
BLF_File
BLF_FileHex
BLF_Init
BLF_InitHex
BLF_InitError
BLF_Update
BLF_UpdateHex
BLF_Final