Crypto.Saltine.Core.Sign

Signatures: Crypto.Saltine.Core.Sign

The newKeypair function randomly generates a secret key and a corresponding public key. The sign function signs a message ByteString using the signer's secret key and returns the resulting signed message. The signOpen function verifies the signature in a signed message using the signer's public key then returns the message without its signature.

Crypto.Saltine.Core.Sign is an EdDSA signature using elliptic-curve Curve25519 (see: http://ed25519.cr.yp.to/). See also, "Daniel J. Bernstein, Niels Duif, Tanja Lange, Peter Schwabe, Bo-Yin Yang. High-speed high-security signatures. Journal of Cryptographic Engineering 2 (2012), 77–89." http://ed25519.cr.yp.to/ed25519-20110926.pdf.

This is current information as of 2013 June 6.

Documentation

data SecretKey

An opaque box cryptographic secret key.

Instances

Eq SecretKey

Ord SecretKey

IsEncoding SecretKey

data PublicKey

An opaque box cryptographic public key.

Instances

Eq PublicKey

Ord PublicKey

IsEncoding PublicKey

type Keypair = (SecretKey, PublicKey)

A convenience type for keypairs

newKeypair :: IO Keypair

Creates a random key of the correct size for sign and signOpen of form (secretKey, publicKey).

sign

Arguments

:: SecretKey

-> ByteString

Message

-> ByteString

Signed message

Augments a message with a signature forming a "signed message".

signOpen

Arguments

:: PublicKey

-> ByteString

Signed message

-> Maybe ByteString

Maybe the restored message

Checks a "signed message" returning Just the original message iff the signature was generated using the SecretKey corresponding to the given PublicKey. Returns Nothing otherwise.