CMSEncryptedData décryptage avec Bouncy Castle throws BadPaddingException: bloc de pad corrompu

Question

J'ai des données cryptées CMS utilisant Bouncy Castle et je voudrais déchiffrer son contenu. Cependant, je rencontre un problème d'obtenir javax.crypto.BadPaddingException: pad block corrupted. Je crois, il y a quelque chose de mal avec la clé secrète

val provider = new BouncyCastleProvider() 

// output encoder 
val gen = new CMSEncryptedDataGenerator() 
val encoder = new JceCMSContentEncryptorBuilder(CMSAlgorithm.DES_EDE3_CBC).setProvider(BouncyCastleProvider.PROVIDER_NAME).build() 

// secrete key 
val spec = new DESedeKeySpec(encoder.getKey.getRepresentation.asInstanceOf[Array[Byte]]) 
val keyFactory = SecretKeyFactory.getInstance("DESEDE", provider) 
val secretKey = keyFactory.generateSecret(spec) 

// Encryption 
val cmsEncryptedData: CMSEncryptedData = gen.generate(new CMSProcessableByteArray("Hello World!".getBytes()), encoder) 

// Decryption 
val decryptedContententBinary: Array[Byte] = { 
    cmsEncryptedData.getContent(new InputDecryptorProvider { 
    override def get(algorithm: AlgorithmIdentifier): InputDecryptor = new InputDecryptor { 

     override def getAlgorithmIdentifier: AlgorithmIdentifier = algorithm 

     override def getInputStream(encIn: InputStream): InputStream = { 
     val parameters = new JceAlgorithmIdentifierConverter().setProvider(provider).getAlgorithmParameters(algorithm) 
     val cipher = Cipher.getInstance(parameters.getAlgorithm, provider) 
     cipher.init(Cipher.DECRYPT_MODE, secretKey, parameters) // throws javax.crypto.BadPaddingException: pad block corrupted 
     new CipherInputStream(encIn, cipher) 
     } 
    } 
    }) 
} 

Answer 1

Je viens de résoudre le problème que j'avais. Voici le code de fonctionnement:

// output encoder 
val gen = new CMSEncryptedDataGenerator() 
val random = new SecureRandom() 
val encoder = new JceCMSContentEncryptorBuilder(CMSAlgorithm.DES_EDE3_CBC).setProvider(BouncyCastleProvider.PROVIDER_NAME).setSecureRandom(random).build() 


// secrete key 
val key = new SecretKeySpec(encoder.getKey.getRepresentation.asInstanceOf[Array[Byte]], "DESede") 

// Encryption 
val cmsEncryptedData: CMSEncryptedData = gen.generate(new CMSProcessableByteArray("Hello World!".getBytes()), encoder) 


// Decryption 
val decryptedContententBinary: Array[Byte] = { 
    cmsEncryptedData.getContent(new InputDecryptorProvider { 
    override def get(algorithm: AlgorithmIdentifier): InputDecryptor = new InputDecryptor { 

     override def getAlgorithmIdentifier: AlgorithmIdentifier = algorithm 

     override def getInputStream(encIn: InputStream): InputStream = { 

     val parameters = new JceAlgorithmIdentifierConverter().setProvider(provider).getAlgorithmParameters(encoder.getAlgorithmIdentifier) 
     val cipher = Cipher.getInstance(algorithm.getAlgorithm.getId, provider) 
     cipher.init(Cipher.DECRYPT_MODE, key, parameters) 
     new CipherInputStream(encIn, cipher) 
     } 
    } 
    }) 
}