47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
package main
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import (
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"fmt"
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"time"
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"unsafe"
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"errors"
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"crypto/sha256"
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"golang.org/x/crypto/curve25519"
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"filippo.io/age"
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)
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type X25519Identity struct {
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secretKey, ourPublicKey []byte
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}
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func main() {
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sum := sha256.Sum256([]byte("some secret password phrase"))
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fmt.Printf("Password hash: %x\n", sum)
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k, err := newX25519IdentityFromScalar(sum[:])
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if err != nil {
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fmt.Printf("internal error: %v", err)
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}
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fmt.Printf("Public key: %s\n", k.Recipient())
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fmt.Printf("# created: %s\n", time.Now().Format(time.RFC3339))
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fmt.Printf("# public key: %s\n", k.Recipient())
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fmt.Printf("%s\n", k)
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}
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// almost a copy of private function in age/x25519.go
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func newX25519IdentityFromScalar(secretKey []byte) (*age.X25519Identity, error) {
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if len(secretKey) != curve25519.ScalarSize {
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return nil, errors.New("invalid X25519 secret key")
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}
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i := &X25519Identity{
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secretKey: make([]byte, curve25519.ScalarSize),
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}
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copy(i.secretKey, secretKey)
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i.ourPublicKey, _ = curve25519.X25519(i.secretKey, curve25519.Basepoint)
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return (*age.X25519Identity)(unsafe.Pointer(i)), nil
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}
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