post_install() {
  printf "%b\n" "$pbp"
}

post_upgrade() {
  post_install
}

read -d '' pbp <<'EOF'
pbp - Usage

Warning: pbp may need sudo privs on first run to create temp file
(likely bug)

Generate a key

    pbp -g -n alice

sending howdy.txt using public key encryption from alice to bob

    pbp -c -S alice -r bob -i howdy.txt

decrypt an encrypted file using public key crypto

    pbp -d -S bob -i howdy.txt.pbp

sending howdy.txt using secret key encryption

    pbp -c -i howdy.txt

decrypt an encrypted file using secret key crypto

    pbp -d -i howdy.txt.pbp

sign howdy.txt

    pbp -s -S alice -i /howdy.txt

verify howdy.txt

    pbp -v -i howdy.txt.sig

sign bobs key

    pbp -m -S alice -n bob

check sigs on carols key

    pbp -C -n carol

alice encrypts howdy.txt to bob using experimental forward secret mode

    pbp -e -S alice -r bob -i howdy.txt -o ./secret-message

bob decrypts howdy.txt from alice using experimental forward secret mode

    pbp -E -S bob -r alice -i ./secret-message

initiate ECDH key exchange

    pbp -D1

respond to ECDH key exchange

    pbp -D2 -Dp 'public component from D1'

finish ECDH key exchange

    pbp -D3 -Dp 'public component from D2' -De 'secret exponent from D1'

random streaming 23GByte of cryptographic randomness

    pbp -R -Rs 23G -o /mnt/huge_fs/random_data

participate in a 4-way DH exchange, 1st message

    pbp -Ds -Dp 4 -S alice -n 'friends001' -i oldkeychain -o newkeychain

participate in a 4-way DH exchange, 2nd message

    pbp -De -S alice -n 'friends001' -i oldkeychain -o newkeychain

this is one big pipe that creates a 3-way ECDH secret between alice, bob and carol:

    pbp -Ds -S alice -Dp 3 -n 'test-dh' -i /dev/null |
    pbp -Ds -S bob -Dp 3 -n 'test-dh' |
    pbp -Ds -S carol -Dp 3 -n 'test-dh' |
    pbp -De -S alice -Dp 3 -n 'test-dh' |
    pbp -De -S bob -Dp 3 -n 'test-dh'

of course instead of a pipe you could use any kind of transport mechanism

(c) 2013, stf <s@ctrlc.hu>, dnet vsza@vsza.hu, AGPLv3.0+
EOF