irita.sdk.module.crypto.ArmoredOutputStreamImpl Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of irita-sdk Show documentation
Show all versions of irita-sdk Show documentation
Irita open alliance chain SDK (java)
package irita.sdk.module.crypto;
import org.bouncycastle.util.Strings;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
/**
* Output stream that writes data in ASCII Armored format.
*
* Note 1: close() needs to be called on an ArmoredOutputStream to write the final checksum. flush() will not do this as
* other classes assume it is always fine to call flush() - it is not though if the checksum gets output.
* Note 2: as multiple PGP blobs are often written to the same stream, close() does not close the underlying stream.
*
*/
public class ArmoredOutputStreamImpl extends OutputStream {
public static final String VERSION_HDR = "Version";
private static final byte[] encodingTable =
{
(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G',
(byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N',
(byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U',
(byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z',
(byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g',
(byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n',
(byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u',
(byte) 'v',
(byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z',
(byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6',
(byte) '7', (byte) '8', (byte) '9',
(byte) '+', (byte) '/'
};
/**
* encode the input data producing a base 64 encoded byte array.
*/
private void encode(
OutputStream out,
int[] data,
int len)
throws IOException {
int d1, d2, d3;
switch (len) {
case 0: /* nothing left to do */
break;
case 1:
d1 = data[0];
out.write(encodingTable[(d1 >>> 2) & 0x3f]);
out.write(encodingTable[(d1 << 4) & 0x3f]);
out.write('=');
out.write('=');
break;
case 2:
d1 = data[0];
d2 = data[1];
out.write(encodingTable[(d1 >>> 2) & 0x3f]);
out.write(encodingTable[((d1 << 4) | (d2 >>> 4)) & 0x3f]);
out.write(encodingTable[(d2 << 2) & 0x3f]);
out.write('=');
break;
case 3:
d1 = data[0];
d2 = data[1];
d3 = data[2];
out.write(encodingTable[(d1 >>> 2) & 0x3f]);
out.write(encodingTable[((d1 << 4) | (d2 >>> 4)) & 0x3f]);
out.write(encodingTable[((d2 << 2) | (d3 >>> 6)) & 0x3f]);
out.write(encodingTable[d3 & 0x3f]);
break;
default:
throw new IOException("unknown length in encode");
}
}
OutputStream out;
int[] buf = new int[3];
int bufPtr = 0;
CRC24 crc = new CRC24();
int chunkCount = 0;
int lastb;
boolean start = true;
boolean clearText = false;
boolean newLine = false;
String nl = Strings.lineSeparator();
String type;
String headerStart = "-----BEGIN ";
String headerTail = "-----";
String footerStart = "-----END ";
String footerTail = "-----";
Hashtable headers = new Hashtable();
/**
* Constructs an armored output stream with {@link #resetHeaders() default headers}.
*
* @param out the OutputStream to wrap.
*/
public ArmoredOutputStreamImpl(
OutputStream out) {
this.out = out;
if (nl == null) {
nl = "\r\n";
}
}
/**
* Set an additional header entry. Any current value(s) under the same name will be
* replaced by the new one. A null value will clear the entry for name.
*
* @param name the name of the header entry.
* @param value the value of the header entry.
*/
public void setHeader(
String name,
String value) {
if (value == null) {
this.headers.remove(name);
} else {
ArrayList valueList = (ArrayList) headers.get(name);
if (valueList == null) {
valueList = new ArrayList();
headers.put(name, valueList);
} else {
valueList.clear();
}
valueList.add(value);
}
}
/**
* Reset the headers to only contain a Version string (if one is present)
*/
public void resetHeaders() {
ArrayList versions = (ArrayList) headers.get(VERSION_HDR);
headers.clear();
if (versions != null) {
headers.put(VERSION_HDR, versions);
}
}
private void writeHeaderEntry(
String name,
String value)
throws IOException {
for (int i = 0; i != name.length(); i++) {
out.write(name.charAt(i));
}
out.write(':');
out.write(' ');
for (int i = 0; i != value.length(); i++) {
out.write(value.charAt(i));
}
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
}
public void write(
int b)
throws IOException {
if (clearText) {
out.write(b);
if (newLine) {
if (!(b == '\n' && lastb == '\r')) {
newLine = false;
}
if (b == '-') {
out.write(' ');
out.write('-'); // dash escape
}
}
if (b == '\r' || (b == '\n' && lastb != '\r')) {
newLine = true;
}
lastb = b;
return;
}
if (start) {
boolean newPacket = (b & 0x40) != 0;
int tag = 0;
if (newPacket) {
tag = b & 0x3f;
} else {
tag = (b & 0x3f) >> 2;
}
type = "TENDERMINT PRIVATE KEY";
for (int i = 0; i != headerStart.length(); i++) {
out.write(headerStart.charAt(i));
}
for (int i = 0; i != type.length(); i++) {
out.write(type.charAt(i));
}
for (int i = 0; i != headerTail.length(); i++) {
out.write(headerTail.charAt(i));
}
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
if (headers.containsKey(VERSION_HDR)) {
writeHeaderEntry(VERSION_HDR, ((ArrayList) headers.get(VERSION_HDR)).get(0).toString());
}
Enumeration e = headers.keys();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
if (!key.equals(VERSION_HDR)) {
ArrayList values = (ArrayList) headers.get(key);
for (Iterator it = values.iterator(); it.hasNext(); ) {
writeHeaderEntry(key, it.next().toString());
}
}
}
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
start = false;
}
if (bufPtr == 3) {
encode(out, buf, bufPtr);
bufPtr = 0;
if ((++chunkCount & 0xf) == 0) {
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
}
}
crc.update(b);
buf[bufPtr++] = b & 0xff;
}
public void flush()
throws IOException {
}
/**
* Note: close() does not close the underlying stream. So it is possible to write
* multiple objects using armoring to a single stream.
*/
public void close()
throws IOException {
if (type != null) {
encode(out, buf, bufPtr);
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
out.write('=');
int crcV = crc.getValue();
buf[0] = ((crcV >> 16) & 0xff);
buf[1] = ((crcV >> 8) & 0xff);
buf[2] = (crcV & 0xff);
encode(out, buf, 3);
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
for (int i = 0; i != footerStart.length(); i++) {
out.write(footerStart.charAt(i));
}
for (int i = 0; i != type.length(); i++) {
out.write(type.charAt(i));
}
for (int i = 0; i != footerTail.length(); i++) {
out.write(footerTail.charAt(i));
}
for (int i = 0; i != nl.length(); i++) {
out.write(nl.charAt(i));
}
out.flush();
type = null;
start = true;
}
}
}
class CRC24 {
private static final int CRC24_INIT = 11994318;
private static final int CRC24_POLY = 25578747;
private int crc = 11994318;
public CRC24() {
}
public void update(int var1) {
this.crc ^= var1 << 16;
for (int var2 = 0; var2 < 8; ++var2) {
this.crc <<= 1;
if ((this.crc & 16777216) != 0) {
this.crc ^= 25578747;
}
}
}
public int getValue() {
return this.crc;
}
public void reset() {
this.crc = 11994318;
}
}