Key Encryption (PBES2)

Key encryption uses a shared passkey to encrypt the CEK, very similar to key wrapping. Unlike Key Wrapping, it does not depend on a fixed key size, and can use any random passphrase as a KEK.

WARNING

Key Encryption with PBES2 requires 2 parameters: an iterations count and a salt size. The minimum recommended values are 1000 for iterations and 16 (128 bits) for salt size.

package main

import "github.com/a-novel-kit/jwt/jwe/jwek"

func main() {
	var cek []byte

	// Passphrase only known to the producer and the recipient.
	var passphrase string

	keyManager := jwek.NewPBES2KeyEncKWManager(
		&jwek.PBES2KeyEncKWManagerConfig{
			CEK: cek, Secret: passphrase,
			Iterations: 1000, SaltSize: 16,
		},
		jwek.PBES2A128KW,
	)
}

Available presets:

Preset	Target "alg"
jwek.PBES2A128KW	PBES2-HS256+A128KW
jwek.PBES2A192KW	PBES2-HS384+A192KW
jwek.PBES2A256KW	PBES2-HS512+A256KW