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package cgeo.geocaching.utils;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import java.math.BigInteger;
import java.security.MessageDigest;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public final class CryptUtils {
private static char[] base64map1 = new char[64];
private static byte[] base64map2 = new byte[128];
static {
int i = 0;
for (char c = 'A'; c <= 'Z'; c++) {
base64map1[i++] = c;
}
for (char c = 'a'; c <= 'z'; c++) {
base64map1[i++] = c;
}
for (char c = '0'; c <= '9'; c++) {
base64map1[i++] = c;
}
base64map1[i++] = '+';
base64map1[i++] = '/';
for (i = 0; i < base64map2.length; i++) {
base64map2[i] = -1;
}
for (i = 0; i < 64; i++) {
base64map2[base64map1[i]] = (byte) i;
}
}
public static String rot13(String text) {
if (text == null) {
return "";
}
final StringBuilder result = new StringBuilder();
// plaintext flag (do not convert)
boolean plaintext = false;
final int length = text.length();
for (int index = 0; index < length; index++) {
int c = text.charAt(index);
if (c == '[') {
plaintext = true;
} else if (c == ']') {
plaintext = false;
} else if (!plaintext) {
int capitalized = c & 32;
c &= ~capitalized;
c = ((c >= 'A') && (c <= 'Z') ? ((c - 'A' + 13) % 26 + 'A') : c)
| capitalized;
}
result.append((char) c);
}
return result.toString();
}
public static String md5(String text) {
String hashed = "";
try {
final MessageDigest digest = MessageDigest.getInstance("MD5");
digest.update(text.getBytes(), 0, text.length());
hashed = new BigInteger(1, digest.digest()).toString(16);
} catch (Exception e) {
Log.e("cgBase.md5: " + e.toString());
}
return hashed;
}
public static String sha1(String text) {
String hashed = "";
try {
final MessageDigest digest = MessageDigest.getInstance("SHA-1");
digest.update(text.getBytes(), 0, text.length());
hashed = new BigInteger(1, digest.digest()).toString(16);
} catch (Exception e) {
Log.e("cgBase.sha1: " + e.toString());
}
return hashed;
}
public static byte[] hashHmac(String text, String salt) {
byte[] macBytes = {};
try {
final SecretKeySpec secretKeySpec = new SecretKeySpec(salt.getBytes(), "HmacSHA1");
final Mac mac = Mac.getInstance("HmacSHA1");
mac.init(secretKeySpec);
macBytes = mac.doFinal(text.getBytes());
} catch (Exception e) {
Log.e("cgBase.hashHmac: " + e.toString());
}
return macBytes;
}
public static CharSequence rot13(final Spannable span) {
// I needed to re-implement the rot13(String) encryption here because we must work on
// a SpannableStringBuilder instead of the pure text and we must replace each character inline.
// Otherwise we loose all the images, colors and so on...
final SpannableStringBuilder buffer = new SpannableStringBuilder(span);
boolean plaintext = false;
final int length = span.length();
for (int index = 0; index < length; index++) {
int c = span.charAt(index);
if (c == '[') {
plaintext = true;
} else if (c == ']') {
plaintext = false;
} else if (!plaintext) {
int capitalized = c & 32;
c &= ~capitalized;
c = ((c >= 'A') && (c <= 'Z') ? ((c - 'A' + 13) % 26 + 'A') : c)
| capitalized;
}
buffer.replace(index, index + 1, String.valueOf((char) c));
}
return buffer;
}
public static String base64Encode(byte[] in) {
int iLen = in.length;
int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
int oLen = ((iLen + 2) / 3) * 4; // output length including padding
char[] out = new char[oLen];
int ip = 0;
int op = 0;
while (ip < iLen) {
int i0 = in[ip++] & 0xff;
int i1 = ip < iLen ? in[ip++] & 0xff : 0;
int i2 = ip < iLen ? in[ip++] & 0xff : 0;
int o0 = i0 >>> 2;
int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
int o3 = i2 & 0x3F;
out[op++] = base64map1[o0];
out[op++] = base64map1[o1];
out[op] = op < oDataLen ? base64map1[o2] : '=';
op++;
out[op] = op < oDataLen ? base64map1[o3] : '=';
op++;
}
return new String(out);
}
}
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