forked from MirrorHub/mautrix-whatsapp
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
/*
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In cryptography, Curve25519 is an elliptic curve offering 128 bits of security and designed for use with the elliptic
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curve Diffie–Hellman (ECDH) key agreement scheme. It is one of the fastest ECC curves and is not covered by any known
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patents. The reference implementation is public domain software. The original Curve25519 paper defined it
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as a Diffie–Hellman (DH) function.
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*/
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package curve25519
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import (
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"crypto/rand"
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"golang.org/x/crypto/curve25519"
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"io"
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)
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/*
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GenerateKey generates a public private key pair using Curve25519.
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*/
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func GenerateKey() (privateKey *[32]byte, publicKey *[32]byte, err error) {
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var pub, priv [32]byte
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_, err = io.ReadFull(rand.Reader, priv[:])
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if err != nil {
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return nil, nil, err
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}
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priv[0] &= 248
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priv[31] &= 127
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priv[31] |= 64
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curve25519.ScalarBaseMult(&pub, &priv)
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return &priv, &pub, nil
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}
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/*
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GenerateSharedSecret generates the shared secret with a given public private key pair.
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*/
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func GenerateSharedSecret(priv, pub [32]byte) []byte {
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var secret [32]byte
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curve25519.ScalarMult(&secret, &priv, &pub)
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return secret[:]
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}
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