A pure Python implemention of curve25519
Project description
x25519 (curve25519)
A pure Python implemention of curve25519 like Go package x/crypto/curve25519:
package main
import (
"fmt"
"bytes"
"golang.org/x/crypto/curve25519"
)
func main() {
var publicKey [32]byte
privateKey := (*[32]byte)(bytes.Repeat([]byte("1"), 32))
curve25519.ScalarBaseMult(&publicKey, privateKey)
fmt.Printf("%x\n", publicKey)
var sharedSecret [32]byte
peerPublicKey := (*[32]byte)(bytes.Repeat([]byte("2"), 32))
curve25519.ScalarMult(&sharedSecret, privateKey, peerPublicKey)
fmt.Printf("%x\n", sharedSecret)
}
/* output:
04f5f29162c31a8defa18e6e742224ee806fc1718a278be859ba5620402b8f3a
a6d830c3561f210fc006c77768369af0f5b3e3e502e74bd3e80991d7cb7bfa50
*/
Usage of this package:
# this code supports both python 2 and 3
from binascii import hexlify
import x25519
private_key = b'1' * 32
public_key = x25519.scalar_base_mult(private_key)
print(hexlify(public_key))
peer_public_key = b'2' * 32
shared_secret = x25519.scalar_mult(private_key, peer_public_key)
print(hexlify(shared_secret))
'''output:
b'04f5f29162c31a8defa18e6e742224ee806fc1718a278be859ba5620402b8f3a'
b'a6d830c3561f210fc006c77768369af0f5b3e3e502e74bd3e80991d7cb7bfa50'
'''
Generally, other C implementions are much faster:
import pysodium
private_key = b'1' * 32
public_key = pysodium.crypto_scalarmult_curve25519_base(private_key)
print(public_key.hex())
peer_public_key = b'2' * 32
shared_secret = pysodium.crypto_scalarmult_curve25519(private_key, peer_public_key)
print(shared_secret.hex())
'''output:
04f5f29162c31a8defa18e6e742224ee806fc1718a278be859ba5620402b8f3a
a6d830c3561f210fc006c77768369af0f5b3e3e502e74bd3e80991d7cb7bfa50
'''
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