I have code in C# which produces MD5 encoded byte[] from String and then this byte[] is converted to String. The C# code is
byte[] valueBytes = (new UnicodeEncoding()).GetBytes(value);
byte[] newHash = (new MD5CryptoServiceProvider()).ComputeHash(valueBytes);
I need to get the same result in Java. I'm trying to do this
Charset utf16 = Charset.forName("UTF-16");
return new String(DigestUtils.md5(value.getBytes(utf16)), utf16);
The code is using Apache Commons Codec library for MD5 calculations. I'm using UTF16 charset because I've read in other SO questions that C#'s UnicodeEncoding uses it by default.
So the code snippets look like they do the same thing, but when I'm passing the string byndyusoft2014, C# gives me hV7u6mQYRgBXXF9jOWWYJg== and Java gives me ﹡둛뭶魙ꇥ늺ꢑ. I've tried UTF16LE and UTF16BE as charsets with no luck.
Has anyone idea about what I'm doing wrong?
I think because of the java decode string to byte[] with utf-8,but the C# is not.So the java and C# encode the different byte array,and then get the different result.You can decode the string to byte[] at c# with utf-8,and see the result.Like following code:
UTF8Encoding utf8 = new UTF8Encoding();
byte[] bytes=utf8.GetBytes("byndyusoft2014");
byte[] en=(new MD5CryptoServiceProvider()).ComputeHash(bytes);
Console.WriteLine(Convert.ToBase64String(en));
and the java code:
byte[] en = DigestUtils.md5Digest("byndyusoft2014".getBytes());
byte[] base64 = Base64Utils.encode(en);
System.out.println(new String(base64));
Of course,in your description,the result of C# like be encoded with base64,so the java should encode the byte array with base64.
The result of them is same as swPvmbGDI1GbPKQwL9knjQ==
The DigestUtils and Base64Utils is some implementation of MD5 and BAS64 in spring library
As it turned out, the main difference was not presented in my original code snippet - it was convertation from MD5 encoded byte[] to String. You need to use Base64 to get final result. This is the working code snippet in Java
Charset utf16 = Charset.forName("UTF-16LE");
return new String(Base64.encodeBase64(DigestUtils.md5(value.getBytes(utf16))));
With this code I get the same result as with C#. Thank you all for good hints!
Related
I having a string that is encoded in java using
data = new String(Base64.getEncoder().encode(encVal), StandardCharsets.UTF_8);
I am receiving this encoded data as an API response. I want to base64 decode this in ruby. I am using
Base64.strict_decode64(data)
for this. but this is not working. Can anyone help me with this?
Your Java code is correct:
byte[] encVal = "Hello World".getBytes();
String data = new String(Base64.getEncoder().encode(encVal), StandardCharsets.UTF_8);
System.out.println(data); // SGVsbG8gV29ybGQ=
The SGVsbG8gV29ybGQ= decodes correctly using multiple tools, e.g. https://www.base64decode.org/.
You are observing garbage characters decoding your value most likely due to an error in creating byte[]. Possibly you have to specify the correct encoding when creating byte[].
I actually have a problem with hashing a password and trying to convert in string to put it in a database.
Currently I have this code
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(motsDePasse.getBytes(StandardCharsets.UTF_8));
String fileString = Base64.getEncoder().encodeToString(hash);
The deal is that it does not give me the good hash. Let's say I try to hash "12345". It should give me 5994471abb01112afcc18159f6cc74b4f511b99806da59b3caf5a9c173cacfc5.
But it actually return WZRHGrsBESr8wYFZ9sx0tPURuZgG2lmzyvWpwXPKz8U=
try using a hex encoder
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest("12345".getBytes(StandardCharsets.UTF_8));
String hex = DatatypeConverter.printHexBinary(hash);
System.out.println(hex);
output
5994471ABB01112AFCC18159F6CC74B4F511B99806DA59B3CAF5A9C173CACFC5
You are Base64 encoding it. If you Hex encode it, you will get the output you are looking for.
You're encoding your bytes in base 64. If you want to encode it in hexadecimal, try here: Java code To convert byte to Hexadecimal. If you're putting into a database as a string though, base64 should be fine for your needs.
I'm writing a REST client from a C# usage example. Now i need to convert a string in the proper format but can't find the equivalent method on Java.
original:
string Credentials = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(string);
At this point I've done this:
String Credentials = new String(DatatypeConverter.parseBase64Binary(String));
but i still need the ASCII conversion and I'm not sure that the things I've fount will work fine, like: Convert character to ASCII numeric value in java
any clues?
Thank you.
If you're using java 8 you should take a look at its new Base64 class. It will provide you with a Base64.Encoder whose encodeToString(byte[] src) method accepts a byte array and return a base64 encoded String.
String base64 = Base64.getEncoder().encodeToString("I'm a String".getBytes());
System.out.println(base64); // prints SSdtIGEgU3RyaW5n
I am trying to convert byte array to base64 format in java.
my problem is sun.misc.BASE64Decoder cannot be used? Is there any alternative?
byte[] buf = new byte[] { 0x12, 0x23 };
String s = new sun.misc.BASE64Encoder().encode(buf);
I would recommend using this library: MigBase64
Use it like this:
byte [] buf = new byte[]{0x12, 0x23};
String s = Base64.encode(buf);
Base64 is not an encryption technique. It is just an encoding mechanism. If you're looking for enryption you're barking up the wrong tree.
import sun.misc.BASE64Decoder is not a 'header file', it is an import statement. It may not compile if you are using a non-Sun/Oracle JDK. It may give you warnings which you should heed. As you haven't actually said what problem you are having it is impossible to comment further.
I have the request to port a .NET web service to java. I need to find the equivalent java code for this piece of code written in .NET:
byte[] b = ... // Some file binary data.
byte[] encoded = System.Text.Encoding.Convert(System.Text.Encoding.GetEncoding(1252), System.Text.Encoding.Unicode, b);
Thanks in advance!
byte[] b = ...
byte[] encoded = new String(b, "Cp1252").getBytes("UTF-16");
Have a look on the List of Supported Encoding in java. Cp1252 encoding in java is theequivalent encoding of windows 1252.