Hello I want to read SHA and MD5 fingerprint value of keystore programmatically of my app from which it was signed.
I'll take either SHA or MD5 value as key for security. This key I will use in the code to encrypt something and decrypt same at server end.
Is there any way to find this or is there any way to do same using different good approach. This should be in such a way nobody other can find this key.
Thanks in advance.
PackageInfo info;
try {
info = getPackageManager().getPackageInfo(
"com.your.package.name", PackageManager.GET_SIGNATURES);
for (Signature signature : info.signatures) {
MessageDigest md;
md = MessageDigest.getInstance("SHA");
md.update(signature.toByteArray());
String hash_key = new String(Base64.encode(md.digest(), 0));
}
} catch (NameNotFoundException e1) {
} catch (NoSuchAlgorithmException e) {
} catch (Exception e) {
}
try this：
/**
*
* #param pkg packageName
* #return
*/
public String getSingInfo (String pkg) {
try {
PackageInfo packageInfo = getPackageManager().getPackageInfo(pkg, PackageManager.GET_SIGNATURES);
Signature[] signs = packageInfo.signatures;
Signature sign = signs[0];
String s = getMd5(sign);
return "md5:" + s ;
} catch (Exception e) {
e.printStackTrace();
}
return "";
}
private String getMd5 (Signature signature) {
return encryptionMD5(signature.toByteArray());
}
public static String encryptionMD5(byte[] byteStr) {
MessageDigest messageDigest = null;
StringBuffer md5StrBuff = new StringBuffer();
try {
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.reset();
messageDigest.update(byteStr);
byte[] byteArray = messageDigest.digest();
for (int i = 0; i < byteArray.length; i++) {
if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
} else {
md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
}
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return md5StrBuff.toString();
}
Find the path of your application's APK file by calling Context.getPackageCodePath()
Copy that APK to a writeable directory of your choice
Use apk-parser to get the information you need from the APK (see example below)
That library is able to decompress the APK file and parse all of its content. An example extracted from the apk-parser's Github page, tailored to your needs:
try {
ApkParser apkParser = new ApkParser(new File(filePath));
ApkSignStatus signStatus = apkParser.verifyApk(); // not needed
List<CertificateMeta> certs = apkParser.getCertificateMetas();
for (CertificateMeta certificateMeta : certs) {
System.out.println(certificateMeta.getCertMd5());
}
} catch (Exception e) {
e.printStackTrace();
}
Added below solution in-case if someone is looking for it for the first time, and don't know how to get it from studio as well.
Many times we search and get suggestion links.
Easiest Way
Open Android Studio
Open Your Project
Click on Gradle (From Right Side Panel, you will see Gradle Bar)
Click on Refresh (Click on Refresh from Gradle Bar, you will see List Gradle scripts of your Project)
Click on Your Project (Your Project Name form List (root))
Click on Tasks
Click on android
Double Click on signingReport (You will get SHA1 and MD5 in Run Bar)
Check Screenshot below:
How can i calculate the CheckSum of my APK file in android? I want to calculate the APK checksum and compare it everytime my app. executes to see if some one has modified the binary code? How can i calculate check sum and achieve this?
Updated in 2020 - Google Play can now optimise, repackage and re-sign uploaded .apks (and add security meta data to the .apk) so it's unlikely this tamper check is still valid. Better to use the SafetyNet attestation API to verify the device and in turn your app - just ensure you're verifying the signature offline on your server.
Here's some code to checksum your APK. I wrote and article on adding tamper detections to your apps (which ironically didn't include apk checksum).
private static long getApkFileChecksum(Context context) {
String apkPath = context.getPackageCodePath();
Long chksum = null;
try {
// Open the file and build a CRC32 checksum.
FileInputStream fis = new FileInputStream(new File(apkPath));
CRC32 chk = new CRC32();
CheckedInputStream cis = new CheckedInputStream(fis, chk);
byte[] buff = new byte[80];
while (cis.read(buff) >= 0) ;
chksum = chk.getValue();
} catch (Exception e) {
e.printStackTrace();
}
return chksum;
}
You could also use this to can the sha-256 of your apk...
public static String getApkFileDigest(Context context) {
String apkPath = context.getPackageCodePath();
try {
byte[] hashed= getDigest(new FileInputStream(apkPath), "SHA-256");
return Base64.encodeToString(hashed, Base64.DEFAULT);
} catch (Throwable throwable) {
throwable.printStackTrace();
}
return null;
}
public static final int BUFFER_SIZE = 2048;
public static byte[] getDigest(InputStream in, String algorithm) throws Throwable {
MessageDigest md = MessageDigest.getInstance(algorithm);
try {
DigestInputStream dis = new DigestInputStream(in, md);
byte[] buffer = new byte[BUFFER_SIZE];
while (dis.read(buffer) != -1) {
}
dis.close();
} finally {
in.close();
}
return md.digest();
}
I am trying to implement rest call with key and secret using md5. I tried a way but its giving me an error,
{"status":"error","message":"Signature mismatch"}.
Please help me, its very urjent!!
this is my md5 method,
private static final String md5(final String parem) {
try {
// Create MD5 Hash
MessageDigest digest = java.security.MessageDigest
.getInstance("MD5");
digest.update(parem.getBytes());
byte messageDigest[] = digest.digest();
// Create Hex String
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < messageDigest.length; i++) {
String h = Integer.toHexString(0xFF & messageDigest[i]);
while (h.length() < 2)
h = "0" + h;
hexString.append(h);
}
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}
Thanks in advance.
I did try with one of my classes and found only one difference:
Yours:
Input: test
Output: 098f6bcd4621d373cade4e832627b4f6
Mine:
Input: test
Output: 098F6BCD4621D373CADE4E832627B4F6
So only one diff, the uppercase....
if that does not solve it, i would say have a look if your hashing the correct data.
I am parsing XML from URL in my application and first of all I shlould verify XML signature. Thus, my question is, is there any simple implementation of signing XML and it's verification on android?
Thanks
Do you mean somethin like this?
Make a request to the webservice that allows you to get the MD5 hash of the XML
Then get the XML
Make a MD5 hash from your XML from inside android
Compare the 2 to verify if you have the entire unmodified XML.
This is a nice string to MD5 converter:
private String md5(String in) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("MD5");
digest.reset();
digest.update(in.getBytes());
byte[] a = digest.digest();
int len = a.length;
StringBuilder sb = new StringBuilder(len << 1);
for (int i = 0; i < len; i++) {
sb.append(Character.forDigit((a[i] & 0xf0) >> 4, 16));
sb.append(Character.forDigit(a[i] & 0x0f, 16));
}
return sb.toString();
} catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
return null;
}
I have a simple android client which needs to 'talk' to a simple C# HTTP listener. I want to provide a basic level of authentication by passing username/password in POST requests.
MD5 hashing is trivial in C# and provides enough security for my needs but I can't seem to find how to do this at the android end.
EDIT: Just to address the concerns raised about MD5 weakness - the C# server runs on the PCs of the users of my android client. In many cases, they'll be accessing the server using wi-fi on their own LANs but, at their own risk, they may choose to access it from the internet. Also the service on the server needs to use pass-through for the MD5 to a 3rd party application I have no control over.
Here is an implementation you can use (updated to use more up to date Java conventions - for:each loop, StringBuilder instead of StringBuffer):
public static String md5(final String s) {
final String MD5 = "MD5";
try {
// Create MD5 Hash
MessageDigest digest = java.security.MessageDigest
.getInstance(MD5);
digest.update(s.getBytes());
byte messageDigest[] = digest.digest();
// Create Hex String
StringBuilder hexString = new StringBuilder();
for (byte aMessageDigest : messageDigest) {
String h = Integer.toHexString(0xFF & aMessageDigest);
while (h.length() < 2)
h = "0" + h;
hexString.append(h);
}
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}
Although it is not recommended for systems that involve even the basic level of security (MD5 is considered broken and can be easily exploited), it is sometimes enough for basic tasks.
The accepted answer didn't work for me in Android 2.2. I don't know why, but it was "eating" some of my zeros (0) .
Apache commons also didn't work on Android 2.2, because it uses methods that are supported only starting from Android 2.3.x. Also, if you want to just MD5 a string, Apache commons is too complex for that. Why one should keep a whole library to use just a small function from it...
Finally I found the following code snippet here which worked perfectly for me. I hope it will be useful for someone...
public String MD5(String md5) {
try {
java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
byte[] array = md.digest(md5.getBytes("UTF-8"));
StringBuffer sb = new StringBuffer();
for (int i = 0; i < array.length; ++i) {
sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1,3));
}
return sb.toString();
} catch (java.security.NoSuchAlgorithmException e) {
} catch(UnsupportedEncodingException ex){
}
return null;
}
The androidsnippets.com code does not work reliably because 0's seem to be cut out of the resulting hash.
A better implementation is here.
public static String MD5_Hash(String s) {
MessageDigest m = null;
try {
m = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
m.update(s.getBytes(),0,s.length());
String hash = new BigInteger(1, m.digest()).toString(16);
return hash;
}
If using Apache Commons Codec is an option, then this would be a shorter implementation:
String md5Hex = new String(Hex.encodeHex(DigestUtils.md5(data)));
Or SHA:
String shaHex= new String(Hex.encodeHex(DigestUtils.sha("textToHash")));
Source for above.
Please follow the link and upvote his solution to award the correct person.
Maven repo link: https://mvnrepository.com/artifact/commons-codec/commons-codec
Current Maven dependency (as of 6 July 2016):
<!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
A solution above using DigestUtils didn't work for me. In my version of Apache commons (the latest one for 2013) there is no such class.
I found another solution here in one blog. It works perfect and doesn't need Apache commons. It looks a little shorter than the code in accepted answer above.
public static String getMd5Hash(String input) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] messageDigest = md.digest(input.getBytes());
BigInteger number = new BigInteger(1, messageDigest);
String md5 = number.toString(16);
while (md5.length() < 32)
md5 = "0" + md5;
return md5;
} catch (NoSuchAlgorithmException e) {
Log.e("MD5", e.getLocalizedMessage());
return null;
}
}
You will need these imports:
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
This is a slight variation of Andranik and Den Delimarsky answers above, but its a bit more concise and doesn't require any bitwise logic. Instead it uses the built-in String.format method to convert the bytes to two character hexadecimal strings (doesn't strip 0's). Normally I would just comment on their answers, but I don't have the reputation to do so.
public static String md5(String input) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
StringBuilder hexString = new StringBuilder();
for (byte digestByte : md.digest(input.getBytes()))
hexString.append(String.format("%02X", digestByte));
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
}
If you'd like to return a lower case string instead, then just change %02X to %02x.
Edit:
Using BigInteger like with wzbozon's answer, you can make the answer even more concise:
public static String md5(String input) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
BigInteger md5Data = new BigInteger(1, md.digest(input.getBytes()));
return String.Format("%032X", md5Data);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
}
Here is Kotlin version from #Andranik answer.
We need to change getBytes to toByteArray (don't need to add charset UTF-8 because the default charset of toByteArray is UTF-8) and cast array[i] to integer
fun String.md5(): String? {
try {
val md = MessageDigest.getInstance("MD5")
val array = md.digest(this.toByteArray())
val sb = StringBuffer()
for (i in array.indices) {
sb.append(Integer.toHexString(array[i].toInt() and 0xFF or 0x100).substring(1, 3))
}
return sb.toString()
} catch (e: java.security.NoSuchAlgorithmException) {
} catch (ex: UnsupportedEncodingException) {
}
return null
}
Hope it help
I have made a simple Library in Kotlin.
Add at Root build.gradle
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
at App build.gradle
implementation 'com.github.1AboveAll:Hasher:-SNAPSHOT'
Usage
In Kotlin
val ob = Hasher()
Then Use hash() method
ob.hash("String_You_Want_To_Encode",Hasher.MD5)
ob.hash("String_You_Want_To_Encode",Hasher.SHA_1)
It will return MD5 and SHA-1 Respectively.
More about the Library
https://github.com/ihimanshurawat/Hasher
Please use SHA-512, MD5 is insecure
public static String getSHA512SecurePassword(String passwordToHash) {
String generatedPassword = null;
try {
MessageDigest md = MessageDigest.getInstance("SHA-512");
md.update("everybreathyoutake".getBytes());
byte[] bytes = md.digest(passwordToHash.getBytes());
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
}
generatedPassword = sb.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return generatedPassword;
}
Useful Kotlin Extension Function Example
fun String.toMD5(): String {
val bytes = MessageDigest.getInstance("MD5").digest(this.toByteArray())
return bytes.toHex()
}
fun ByteArray.toHex(): String {
return joinToString("") { "%02x".format(it) }
}
In our MVC application we generate for long param
using System.Security.Cryptography;
using System.Text;
...
public static string getMD5(long id)
{
// convert
string result = (id ^ long.MaxValue).ToString("X") + "-ANY-TEXT";
using (MD5 md5Hash = MD5.Create())
{
// Convert the input string to a byte array and compute the hash.
byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(result));
// Create a new Stringbuilder to collect the bytes and create a string.
StringBuilder sBuilder = new StringBuilder();
for (int i = 0; i < data.Length; i++)
sBuilder.Append(data[i].ToString("x2"));
// Return the hexadecimal string.
result = sBuilder.ToString().ToUpper();
}
return result;
}
and same in Android application (thenk helps Andranik)
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
...
public String getIdHash(long id){
String hash = null;
long intId = id ^ Long.MAX_VALUE;
String md5 = String.format("%X-ANY-TEXT", intId);
try {
MessageDigest md = java.security.MessageDigest.getInstance("MD5");
byte[] arr = md.digest(md5.getBytes());
StringBuffer sb = new StringBuffer();
for (int i = 0; i < arr.length; ++i)
sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,3));
hash = sb.toString();
} catch (NoSuchAlgorithmException e) {
Log.e("MD5", e.getMessage());
}
return hash.toUpperCase();
}
i have used below method to give me md5 by passing string for which you want to get md5
public static String getMd5Key(String password) {
// String password = "12131123984335";
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(password.getBytes());
byte byteData[] = md.digest();
//convert the byte to hex format method 1
StringBuffer sb = new StringBuffer();
for (int i = 0; i < byteData.length; i++) {
sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
}
System.out.println("Digest(in hex format):: " + sb.toString());
//convert the byte to hex format method 2
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < byteData.length; i++) {
String hex = Integer.toHexString(0xff & byteData[i]);
if (hex.length() == 1) hexString.append('0');
hexString.append(hex);
}
System.out.println("Digest(in hex format):: " + hexString.toString());
return hexString.toString();
} catch (Exception e) {
// TODO: handle exception
}
return "";
}
MD5 is a bit old, SHA-1 is a better algorithm, there is a example here.
(Also as they note in that post, Java handles this on it's own, no Android specific code.)
Far too wasteful toHex() conversion prevails in other suggestions, really.
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
public static String md5string(String s) {
return toHex(md5plain(s));
}
public static byte[] md5plain(String s) {
final String MD5 = "MD5";
try {
// Create MD5 Hash
MessageDigest digest = java.security.MessageDigest.getInstance(MD5);
digest.update(s.getBytes());
return digest.digest();
} catch (NoSuchAlgorithmException e) {
// never happens
e.printStackTrace();
return null;
}
}
public static String toHex(byte[] buf) {
char[] hexChars = new char[buf.length * 2];
int v;
for (int i = 0; i < buf.length; i++) {
v = buf[i] & 0xFF;
hexChars[i * 2] = HEX_ARRAY[v >>> 4];
hexChars[i * 2 + 1] = HEX_ARRAY[v & 0x0F];
}
return new String(hexChars);
}
this is working perfectly for me, I used this to get MD5 on LIST Array(then convert it to JSON object), but if you only need to apply it on your data. type format, replace JsonObject with yours.
Especially if you have a mismatch with python MD5 implementation use this!
private static String md5(List<AccelerationSensor> sensor) {
Gson gson= new Gson();
byte[] JsonObject = new byte[0];
try {
JsonObject = gson.toJson(sensor).getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
MessageDigest m = null;
try {
m = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
byte[] thedigest = m.digest(JsonObject);
String hash = String.format("%032x", new BigInteger(1, thedigest));
return hash;
}
The provided solutions for the Scala language (a little shorter):
def getMd5(content: Array[Byte]) =
try {
val md = MessageDigest.getInstance("MD5")
val bytes = md.digest(content)
bytes.map(b => Integer.toHexString((b + 0x100) % 0x100)).mkString
} catch {
case ex: Throwable => null
}