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72 lines
1.6 KiB
72 lines
1.6 KiB
package all
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import (
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"github.com/xtls/xray-core/main/commands/base"
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"golang.org/x/crypto/curve25519"
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)
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var cmdX25519 = &base.Command{
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UsageLine: `{{.Exec}} x25519 [-i "private key (base64.RawURLEncoding)"]`,
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Short: `Generate key pair for x25519 key exchange`,
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Long: `
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Generate key pair for x25519 key exchange.
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Random: {{.Exec}} x25519
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From private key: {{.Exec}} x25519 -i "private key (base64.RawURLEncoding)"
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`,
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}
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func init() {
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cmdX25519.Run = executeX25519 // break init loop
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}
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var input_base64 = cmdX25519.Flag.String("i", "", "")
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func executeX25519(cmd *base.Command, args []string) {
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var output string
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var err error
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var privateKey []byte
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var publicKey []byte
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if len(*input_base64) > 0 {
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privateKey, err = base64.RawURLEncoding.DecodeString(*input_base64)
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if err != nil {
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output = err.Error()
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goto out
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}
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if len(privateKey) != curve25519.ScalarSize {
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output = "Invalid length of private key."
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goto out
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}
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}
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if privateKey == nil {
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privateKey = make([]byte, curve25519.ScalarSize)
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if _, err = rand.Read(privateKey); err != nil {
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output = err.Error()
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goto out
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}
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}
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// Modify random bytes using algorithm described at:
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// https://cr.yp.to/ecdh.html.
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privateKey[0] &= 248
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privateKey[31] &= 127
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privateKey[31] |= 64
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if publicKey, err = curve25519.X25519(privateKey, curve25519.Basepoint); err != nil {
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output = err.Error()
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goto out
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}
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output = fmt.Sprintf("Private key: %v\nPublic key: %v",
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base64.RawURLEncoding.EncodeToString(privateKey),
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base64.RawURLEncoding.EncodeToString(publicKey))
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out:
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fmt.Println(output)
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}
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