I have generated on my android application a pair of RSA Keys. I receive from a web service - an AES Key, encrypted with my RSA public key - a String encoded with the AES key.
So I must do the following: - decrypt the AES Key - decrypt the string with the obtained AES Key. To generate the RSA Keys I did: keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(size); keypair = keyGen.genKeyPair(); privateKey = keypair.getPrivate(); publicKey = keypair.getPublic(); On RSA decrypt I use : public static byte[] decryptRSA( PrivateKey key, byte[] text) throws Exception { byte[] dectyptedText = null; Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS7Padding"); cipher.init(Cipher.DECRYPT_MODE, key); dectyptedText = cipher.doFinal(text); return dectyptedText; } On AES decrypt I use: public static byte[] decryptAES(byte[] key, byte[] text) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/ PKCS7Padding"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(text); return decrypted; } So, in my code, to obtain the decrypted AES Key I do byte[] decryptedAESKey = sm.decryptRSA(key, Base64.decode(ReceivedBase64EncryptedAESKey)); byte[] decryptedString = sm.decryptAES(decryptedAESKey, Base64.decode(ReceivedEncryptedAESString));[/ >From the web service I get the ReceivedEncryptedAESString= qjYcPCHkFpbTjntDCpXCGabSY5DFH... and the decryptedAESKey looks like: [121, 98, 51, 100, 108, 112, 118, 107, 118, 97] The problem appears to be on cipher.init(Cipher.DECRYPT_MODE, skeySpec); as it throws an exception: InvalidKeyException: Key length not 128/192/256 bits. Maybe I do RSA decryption wrong ? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en