jstring
JNI_FUNC(MainActivity_jnidecode)( JNIEnv* env,
jobject thiz, jbyteArray b)
{
jsize length = (*env)->GetArrayLength(env,b);
char* bytes = (*env)->GetByteArrayElements(env,b,NULL);
char pwd[] = "java/lang/String";
xor_a(bytes, length, pwd);
jbyteArray ba;
ba = (*env)->NewByteArray(env,length);
(*env)->SetByteArrayRegion(env, ba, 0, length, bytes);
return ba;
}
/** Encrypts and authenticates a packet */
static bool method_encrypt(UNUSED fastd_peer_t *peer, fastd_method_session_state_t *session, fastd_buffer_t *out, fastd_buffer_t in) {
fastd_buffer_pull_head_zero(&in, sizeof(fastd_block128_t));
size_t tail_len = alignto(in.len, sizeof(fastd_block128_t))-in.len;
*out = fastd_buffer_alloc(in.len, alignto(COMMON_HEADBYTES, 16), sizeof(fastd_block128_t)+tail_len);
if (tail_len)
memset(in.data+in.len, 0, tail_len);
uint8_t nonce[session->method->cipher_info->iv_length] __attribute__((aligned(8)));
fastd_method_expand_nonce(nonce, session->common.send_nonce, sizeof(nonce));
int n_blocks = block_count(in.len, sizeof(fastd_block128_t));
fastd_block128_t *inblocks = in.data;
fastd_block128_t *outblocks = out->data;
fastd_block128_t tag;
bool ok = session->cipher->crypt(session->cipher_state, outblocks, inblocks, n_blocks*sizeof(fastd_block128_t), nonce);
if (ok) {
if (tail_len)
memset(out->data+out->len, 0, tail_len);
put_size(&outblocks[n_blocks], in.len-sizeof(fastd_block128_t));
ok = session->ghash->digest(session->ghash_state, &tag, outblocks+1, n_blocks*sizeof(fastd_block128_t));
}
if (!ok) {
fastd_buffer_free(*out);
return false;
}
xor_a(&outblocks[0], &tag);
fastd_buffer_free(in);
fastd_method_put_common_header(out, session->common.send_nonce, 0);
fastd_method_increment_nonce(&session->common);
return true;
}
