A Python implementation of saltpack. You can play with commands like:

saltpack encrypt -m "foo" | saltpack decrypt --debug

Install with pip or pip3, depending on what your system calls Python 3's version of pip:

pip install saltpack

A brief summary of the commands:

• encrypt and decrypt deal with encrypted messages. Use the --binary flag to skip the ASCII armoring. The default private key is 32 zero bytes, and the default recipients list is just the sender. They will read from stdin unless you provide the --message flag.
• sign and verify deal with signed messages. The default private key is randomly generated. These also understand --binary and --message. The --detached flag (for signing) and the --signature <file> flag (for verifying) invoke the detached signing mode.
• armor and dearmor commands read input from stdin and either encode it or decode it with saltpack's base 62 ASCII armor. The --raw flag skips the "BEGIN..." header and "END..." footer. Note that the header produced by this command doesn't describe the message type (i.e. "BEGIN SALTPACK ENCRYPTED MESSAGE"), so prefer encrypt and sign's built-in armoring.
• block and unblock are low level command for playing with the BaseX encoding scheme that underlies our base 62 ASCII armor.
• efficient prints out a list of efficient BaseX block sizes for a given alphabet size.