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Old 09-11-2017, 04:58 AM   #1
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Default need help to decrypt video

hello,

i have a video to decrypt. it encrypting cyphertool.java
can any one know how to decrypt?

thanks













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Old 09-11-2017, 05:15 AM   #2
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maybe that will help you

Quote:
[Only registered and activated users can see links. ]
but you must compile it!













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Old 09-11-2017, 05:29 AM   #3
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Quote:
Originally Posted by go2crck View Post
maybe that will help you



but you must compile it!
thanks for reply.
i decompile the android add which play that encrypted video and i found this code.
Quote:
import android.util.Log;

public class CipherTools
{
private static final int BYTES_PER_INT = 4;

public CipherTools() {}

private static void checkCipherNotZero(int paramInt)
{
if (paramInt == 0) {
throw new IllegalArgumentException("The input cipher key is zero. For this reason, the data would not be encrypted.");
}
}

public static byte[] decrypt(byte[] paramArrayOfByte, int paramInt)
{
Log.i("Encryption", "In decrypt function ---> ");
checkCipherNotZero(paramInt);
byte[] arrayOfByte = (byte[])paramArrayOfByte.clone();
Log.i("Encryption", "output.length" + arrayOfByte.length);
for (int i = -4 + arrayOfByte.length; i >= 0; i--) {
writeInt(arrayOfByte, i, readInt(arrayOfByte, i) - paramInt);
}
Log.i("Encryption", "Leaving decrypt function <---");
return arrayOfByte;
}

/* Error */
public static boolean partialDecrypt(java.io.File paramFile1, java.io.File paramFile2, int paramInt)
{
// Byte code:
// 0: ldc 71
// 2: newarray byte
// 4: astore 5
// 6: new 73 java/io/FileInputStream
// 9: dup
// 10: aload_0
// 11: invokespecial 76 java/io/FileInputStream:<init> (Ljava/io/FileV
// 14: astore 6
// 16: aload_0
// 17: invokevirtual 82 java/io/File:length ()J
// 20: pop2
// 21: aload 6
// 23: aload 5
// 25: iconst_0
// 26: ldc 71
// 28: invokevirtual 86 java/io/FileInputStream:read ([BII)I
// 31: pop
// 32: aload 5
// 34: iload_2
// 35: invokestatic 88 sumit/krescendo/flute/sakalpana/sankalpana/CipherToolsecrypt ([BI)[B
// 38: astore 10
// 40: new 90 java/io/BufferedOutputStream
// 43: dup
// 44: new 92 java/io/FileOutputStream
// 47: dup
// 48: aload_1
// 49: invokespecial 93 java/io/FileOutputStream:<init> (Ljava/io/FileV
// 52: invokespecial 96 java/io/BufferedOutputStream:<init> (Ljava/io/OutputStreamV
// 55: astore 11
// 57: aload 11
// 59: aload 10
// 61: invokevirtual 100 java/io/BufferedOutputStream:write ([B)V
// 64: aload 6
// 66: aload 5
// 68: iconst_0
// 69: ldc 71
// 71: invokevirtual 86 java/io/FileInputStream:read ([BII)I
// 74: iconst_m1
// 75: if_icmpeq +27 -> 102
// 78: aload 11
// 80: aload 5
// 82: invokevirtual 100 java/io/BufferedOutputStream:write ([B)V
// 85: aload 11
// 87: invokevirtual 103 java/io/BufferedOutputStream:flush ()V
// 90: goto -26 -> 64
// 93: astore 4
// 95: aload 4
// 97: invokevirtual 106 java/io/IOException:printStackTrace ()V
// 100: iconst_1
// 101: ireturn
// 102: aload 6
// 104: invokevirtual 109 java/io/FileInputStream:close ()V
// 107: aload 11
// 109: invokevirtual 110 java/io/BufferedOutputStream:close ()V
// 112: ldc 112
// 114: ldc 114
// 116: invokestatic 32 android/util/Log:i (Ljava/lang/String;Ljava/lang/StringI
// 119: pop
// 120: goto -20 -> 100
// 123: astore_3
// 124: aload_3
// 125: athrow
// Local variable table:
// start length slot name signature
// 0 126 0 paramFile1 java.io.File
// 0 126 1 paramFile2 java.io.File
// 0 126 2 paramInt int
// 123 2 3 localObject Object
// 93 3 4 localIOException java.io.IOException
// 4 77 5 arrayOfByte1 byte[]
// 14 89 6 localFileInputStream java.io.FileInputStream
// 38 22 10 arrayOfByte2 byte[]
// 55 53 11 localBufferedOutputStream java.io.BufferedOutputStream
// Exception table:
// from to target type
// 0 90 93 java/io/IOException
// 102 120 93 java/io/IOException
// 0 90 123 finally
// 95 100 123 finally
// 102 120 123 finally
}

private static int readInt(byte[] paramArrayOfByte, int paramInt)
{
int i = unsignedToBytes(paramArrayOfByte[paramInt]);
int j = unsignedToBytes(paramArrayOfByte[(paramInt + 1)]);
return i | unsignedToBytes(paramArrayOfByte[(paramInt + 3)]) << 24 | unsignedToBytes(paramArrayOfByte[(paramInt + 2)]) << 16 | j << 8;
}

public static int unsignedToBytes(byte paramByte)
{
return paramByte & 0xFF;
}

private static void writeInt(byte[] paramArrayOfByte, int paramInt1, int paramInt2)
{
paramArrayOfByte[paramInt1] = ((byte)(paramInt2 & 0xFF));
paramArrayOfByte[(paramInt1 + 1)] = ((byte)(0xFF & paramInt2 >>> 8));
paramArrayOfByte[(paramInt1 + 2)] = ((byte)(0xFF & paramInt2 >>> 16));
paramArrayOfByte[(paramInt1 + 3)] = ((byte)(0xFF & paramInt2 >>> 24));
}
}
but as you see it not fully decompiled, if any one interested i will share the apk

thanks













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Old 09-11-2017, 06:37 AM   #4
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Default

really to say im not profi in Android Code

i have tryed to work with it , but i dont understand the decompiled Code like v1,v0 ..... this is for new and i dont want to learn it . if you have encrypted Video on Windows maybe there i can help you but not with Android

sorry













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Old 09-11-2017, 06:45 PM   #5
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Default

its a mp4 video and i want to play it on windows













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Old 10-11-2017, 01:36 AM   #6
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Send me pm this Video maybe i will find how to decrypt it!













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Old 13-11-2017, 01:08 AM   #7
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Default

Quote:
Originally Posted by go2crck View Post
Send me pm this Video maybe i will find how to decrypt it!
please check your message .. i pm you thanks













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Old 03-12-2017, 02:28 PM   #8
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Sorry i have nothing founded for your decryptment













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