70 lines
1.3 KiB
Go
70 lines
1.3 KiB
Go
package main
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import (
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"crypto/ecdh"
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"crypto/sha256"
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"log"
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"git.min.rip/min/webpush-client-go/rfc8291"
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)
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var (
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CURVE = ecdh.P256()
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HASH = sha256.New
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PLAINTEXT = "Plain text message!!!"
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)
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func appserver(authSecret []byte, useragentPublicKey *ecdh.PublicKey) []byte {
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_, salt, privateKey := rfc8291.NewSecrets(CURVE)
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ece := rfc8291.NewRFC8291(HASH)
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encrypted, err := ece.Encrypt(
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[]byte(PLAINTEXT),
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salt,
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authSecret,
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useragentPublicKey,
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privateKey,
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)
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if err != nil {
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log.Panicln("Encryption Error:", err)
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}
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return encrypted
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}
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func main() {
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// UserAgent
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authSecret, _, useragentPrivateKey := rfc8291.NewSecrets(CURVE)
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ece := rfc8291.NewRFC8291(HASH)
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// AppServer
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encrypted := appserver(authSecret, useragentPrivateKey.PublicKey())
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// UserAgent
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payload, err := rfc8291.Unmarshal(encrypted)
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if err != nil {
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log.Panicln("RFC8291 Unmarshal Error:", err)
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}
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// In RFC8291, KeyID is the AppServer's Public Key
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appserverPublicKey, err := ecdh.P256().NewPublicKey(payload.KeyId)
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if err != nil {
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log.Panicln("Load PublicKey Error", err)
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}
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plaintext, err := ece.Decrypt(
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payload.CipherText,
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payload.Salt,
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authSecret,
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useragentPrivateKey,
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appserverPublicKey,
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)
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if err != nil {
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log.Panicln("RFC8291 Decrypt Error", err)
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}
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log.Println("Valid Message: ", PLAINTEXT)
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log.Println("Decrypted Text:", string(plaintext))
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}
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