kex is a small wrapper around go's crypto/elliptic
library I
used in a personal project to further abstract and simplify shared secret generation
within an client/server configuration.
go get github.com/xtrcode/kex
alice := kex.NewP512()
bob := kex.NewP512()
alicePK, err := alice.Encode()
if err != nil {
log.Fatal("Encoding alice' public key failed")
}
bobPK, err := bob.Encode()
if err != nil {
log.Fatal("Encoding bobs public key failed")
}
// transmit data beep bloop
if err = bob.Decode(alicePK); err != nil {
log.Fatal(err)
}
if err = alice.Decode(bobPK); err != nil {
log.Fatal(err)
}
alice.Calculate()
bob.Calculate()
fmt.Printf("\nShared key (Alice) %x\n", alice.Sum224())
fmt.Printf("\nShared key (Bob) %x\n", bob.Sum224())
The generated byte-sequence of kexObj.Encode()
is encoded with encoding/gob
and ready
for transmission. At the other end just throw the byte-sequence into kexObj2.Decode(data)
, calculate
your shared secret and start communicating!
For an (non)official implementation see: https://github.com/golang/crypto/blob /e8f229864d71a49e5fdc4a9a134c5f85c4c33d64/ssh/kex.go#L210-L377
Q: Why ECDH and not DHE?
A: Go doesn't support DHE out-of-the box (at least to my knowledge).
Q: Why don't you check the factors?
A: Kex isn't intended for production use. Please create a pull request if you
want to contribute additional features.
This is free and unencumbered software released into the public domain.
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