char *Encryption::DecryptUsernamePassword(const char* encrypted_buffer, unsigned int buffer_size, int mode)
{
if(decrypt_func)
{
return decrypt_func(encrypted_buffer, buffer_size, mode);
}
return NULL;
}
static ssize_t
purple_aes_cipher_decrypt(PurpleCipher *cipher, const guchar input[],
size_t in_len, guchar output[], size_t out_size)
{
PurpleAESCipherPrivate *priv = PURPLE_AES_CIPHER_GET_PRIVATE(cipher);
purple_aes_cipher_crypt_func decrypt_func;
gboolean succ;
ssize_t out_len;
if (priv->failure)
return -1;
if (in_len > out_size) {
purple_debug_error("cipher-aes", "Output buffer too small\n");
return -1;
}
if ((in_len % PURPLE_AES_BLOCK_SIZE) != 0 || in_len == 0) {
purple_debug_error("cipher-aes", "Malformed data\n");
return -1;
}
#if defined(PURPLE_AES_USE_GNUTLS)
decrypt_func = purple_aes_cipher_gnutls_decrypt;
#elif defined(PURPLE_AES_USE_NSS)
decrypt_func = purple_aes_cipher_nss_decrypt;
#else
purple_debug_error("cipher-aes", "No matching decrypt_func\n");
return -1;
#endif
succ = decrypt_func(input, output, in_len, priv->iv, priv->key,
priv->key_size);
if (!succ) {
memset(output, 0, in_len);
return -1;
}
out_len = purple_aes_cipher_unpad_pkcs7(output, in_len);
if (out_len < 0) {
memset(output, 0, in_len);
return -1;
}
return out_len;
}