bLnCZMag

1public byte[] encryptDecrypt(String jsonData, String publicKey) throws Exception
2    {
3        Security.addProvider(new BouncyCastleProvider());
4        SecretKey secKey = getSecretEncryptionKey();
5
6        cipherText = encryptText(jsonData, secKey);
7        return cipherText;
8    }
9
10    public static SecretKey getSecretEncryptionKey() throws Exception
11    {
12        KeyGenerator generator = KeyGenerator.getInstance("AES");
13        generator.init(256);
14        SecretKey secKey = generator.generateKey();
15        return secKey;
16    }
17    public static byte[] encryptText(String plainText, SecretKey secKey) throws Exception
18    {
19        // AES defaults to AES/ECB/PKCS5Padding in Java 7
20        SecretKeySpec skeySpec = new SecretKeySpec(secKey.getEncoded(), "AES/ECB/PKCS7Padding");
21
22        Cipher aesCipher = Cipher.getInstance("AES/ECB/PKCS7Padding");
23        aesCipher.init(Cipher.ENCRYPT_MODE, skeySpec);
24        return  aesCipher.doFinal(plainText.getBytes());
25    }
26	
27INT32 Security::decrypt(UINT8 *ciphertext, INT32 ciphertext_len, UINT8 *key,
28                UINT8 *iv, UINT8 *plaintext)
29{
30  EVP_CIPHER_CTX *ctx;
31
32  INT32 len;
33
34  INT32 plaintext_len;
35
36  /* Create and initialise the context */
37  if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();
38
39if (!EVP_DecryptInit_ex(ctx, EVP_aes_256_ecb(), 0, Key, NULL)) {
40        printf("n ERROR!! n");
41                return -1;
42     }
43
44  /* Provide the message to be decrypted, and obtain the plaintext output.
45   * EVP_DecryptUpdate can be called multiple times if necessary
46   */
47  if(1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
48    handleErrors();
49  plaintext_len = len;
50
51  /* Finalise the decryption. Further plaintext bytes may be written at
52   * this stage.
53   */
54  if(1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len)) handleErrors();
55  plaintext_len += len;
56
57  /* Clean up */
58  EVP_CIPHER_CTX_free(ctx);
59
60  return plaintext_len;
61}