1 files changed, 105 insertions, 23 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java b/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java
index 9599aa37..7e4a4fc5 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java
@@ -1,20 +1,35 @@
 package de.thedevstack.conversationsplus.utils;
 
-import java.security.SecureRandom;
+import android.os.Bundle;
+import android.util.Pair;
+
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x500.style.BCStyle;
+import org.bouncycastle.asn1.x500.style.IETFUtils;
+import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
+
+import java.security.MessageDigest;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.CertificateParsingException;
+import java.security.cert.X509Certificate;
 import java.text.Normalizer;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Locale;
 
 import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.R;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.xmpp.jid.InvalidJidException;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
 
 public final class CryptoHelper {
 	public static final String FILETRANSFER = "?FILETRANSFERv1:";
 	private final static char[] hexArray = "0123456789abcdef".toCharArray();
-	private final static char[] vowels = "aeiou".toCharArray();
-	private final static char[] consonants = "bcdfghjklmnpqrstvwxyz".toCharArray();
 	final public static byte[] ONE = new byte[] { 0, 0, 0, 1 };
 
 	public static String bytesToHex(byte[] bytes) {
@@ -48,22 +63,6 @@ public final class CryptoHelper {
 		return result;
 	}
 
-	public static String randomMucName(SecureRandom random) {
-		return randomWord(3, random) + "." + randomWord(7, random);
-	}
-
-	private static String randomWord(int lenght, SecureRandom random) {
-		StringBuilder builder = new StringBuilder(lenght);
-		for (int i = 0; i < lenght; ++i) {
-			if (i % 2 == 0) {
-				builder.append(consonants[random.nextInt(consonants.length)]);
-			} else {
-				builder.append(vowels[random.nextInt(vowels.length)]);
-			}
-		}
-		return builder.toString();
-	}
-
 	/**
 	 * Escapes usernames or passwords for SASL.
 	 */
@@ -96,11 +95,18 @@ public final class CryptoHelper {
 		} else if (fingerprint.length() < 40) {
 			return fingerprint;
 		}
+		StringBuilder builder = new StringBuilder(fingerprint.toLowerCase(Locale.US).replaceAll("\\s", ""));
+		for(int i=8;i<builder.length();i+=9) {
+			builder.insert(i, ' ');
+		}
+		return builder.toString();
+	}
+
+	public static String prettifyFingerprintCert(String fingerprint) {
 		StringBuilder builder = new StringBuilder(fingerprint);
-		builder.insert(8, " ");
-		builder.insert(17, " ");
-		builder.insert(26, " ");
-		builder.insert(35, " ");
+		for(int i=2;i < builder.length(); i+=3) {
+			builder.insert(i,':');
+		}
 		return builder.toString();
 	}
 
@@ -126,4 +132,80 @@ public final class CryptoHelper {
 			}
 		}
 	}
+
+	public static Pair<Jid,String> extractJidAndName(X509Certificate certificate) throws CertificateEncodingException, InvalidJidException, CertificateParsingException {
+		Collection<List<?>> alternativeNames = certificate.getSubjectAlternativeNames();
+		List<String> emails = new ArrayList<>();
+		if (alternativeNames != null) {
+			for(List<?> san : alternativeNames) {
+				Integer type = (Integer) san.get(0);
+				if (type == 1) {
+					emails.add((String) san.get(1));
+				}
+			}
+		}
+		X500Name x500name = new JcaX509CertificateHolder(certificate).getSubject();
+		if (emails.size() == 0) {
+			emails.add(IETFUtils.valueToString(x500name.getRDNs(BCStyle.EmailAddress)[0].getFirst().getValue()));
+		}
+		String name = IETFUtils.valueToString(x500name.getRDNs(BCStyle.CN)[0].getFirst().getValue());
+		if (emails.size() >= 1) {
+			return new Pair<>(Jid.fromString(emails.get(0)), name);
+		} else {
+			return null;
+		}
+	}
+
+	public static Bundle extractCertificateInformation(X509Certificate certificate) {
+		Bundle information = new Bundle();
+		try {
+			JcaX509CertificateHolder holder = new JcaX509CertificateHolder(certificate);
+			X500Name subject = holder.getSubject();
+			try {
+				information.putString("subject_cn", subject.getRDNs(BCStyle.CN)[0].getFirst().getValue().toString());
+			} catch (Exception e) {
+				//ignored
+			}
+			try {
+				information.putString("subject_o",subject.getRDNs(BCStyle.O)[0].getFirst().getValue().toString());
+			} catch (Exception e) {
+				//ignored
+			}
+
+			X500Name issuer = holder.getIssuer();
+			try {
+				information.putString("issuer_cn", issuer.getRDNs(BCStyle.CN)[0].getFirst().getValue().toString());
+			} catch (Exception e) {
+				//ignored
+			}
+			try {
+				information.putString("issuer_o", issuer.getRDNs(BCStyle.O)[0].getFirst().getValue().toString());
+			} catch (Exception e) {
+				//ignored
+			}
+			try {
+				MessageDigest md = MessageDigest.getInstance("SHA-1");
+				byte[] fingerprint = md.digest(certificate.getEncoded());
+				information.putString("sha1", prettifyFingerprintCert(bytesToHex(fingerprint)));
+			} catch (Exception e) {
+
+			}
+			return information;
+		} catch (CertificateEncodingException e) {
+			return information;
+		}
+	}
+
+	public static int encryptionTypeToText(int encryption) {
+		switch (encryption) {
+			case Message.ENCRYPTION_OTR:
+				return R.string.encryption_choice_otr;
+			case Message.ENCRYPTION_AXOLOTL:
+				return R.string.encryption_choice_omemo;
+			case Message.ENCRYPTION_NONE:
+				return R.string.encryption_choice_unencrypted;
+			default:
+				return R.string.encryption_choice_pgp;
+		}
+	}
 }