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; }