You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
21 lines
754 B
21 lines
754 B
// Copyright (c) 2015 The btcsuite developers |
|
// Copyright (c) 2015-2023 The Decred developers |
|
// Use of this source code is governed by an ISC |
|
// license that can be found in the LICENSE file. |
|
|
|
package secp256k1 |
|
|
|
// GenerateSharedSecret generates a shared secret based on a secret key and a |
|
// public key using Diffie-Hellman key exchange (ECDH) (RFC 5903). |
|
// RFC5903 Section 9 states we should only return x. |
|
// |
|
// It is recommended to securely hash the result before using as a cryptographic |
|
// key. |
|
func GenerateSharedSecret(seckey *SecretKey, pubkey *PublicKey) []byte { |
|
var point, result JacobianPoint |
|
pubkey.AsJacobian(&point) |
|
ScalarMultNonConst(&seckey.Key, &point, &result) |
|
result.ToAffine() |
|
xBytes := result.X.Bytes() |
|
return xBytes[:] |
|
}
|
|
|