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Questions tagged [message-digest]

131 questions
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MessageDigest.digest() returning same hash for different strings having Norwegian character

I am calling MessageDigest.digest() method to get the hash of the password. If the password contains a Norwegian character e.g. 'ø', this method returns same hash for different strings with different last character. "Høstname1" and "Høstname2" have…
namang029
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How to implement SHA256 on Java Card 2.2.1?

I'm trying to implement RSA sign on Java Card version 2.2.1. I have implemented RSA 2048 and tested this successfully, but when trying to hash using the MessageDigest class, I'm unable to get the correct answer in response. Here is my…
MJay
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Hashing raw bytes in Python and Java produces different results

I'm trying to replicate the behavior of a Python 2.7 function in Java, but I'm getting different results when running a (seemingly) identical sequence of bytes through a SHA-256 hash. The bytes are generated by manipulating a very large integer…
jming
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SHA1 MessageDigest and CommonCrypto updates getting different results

I'm trying to recreate the implementation of PasswordDeriveBytes from VB.NET and so far I have implemented in iOS Objective C code its giving me different results from a Java implementation. The reason why we try to recreate the implementation of…
Tertel
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How to set MessageDigest seed?

The MessageDigest class implements the SHA-1 algorithm (among many others). The SHA-1 algorithm allows one to use different "seeds" or initial digests. See SHA-1 Psuedocode The algorithm initializes variables, or the seed: Initialize…
Thomas Matthews
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messagedigest object throws NoSuchAlgorithm when used as a field/static variable in java

I am able to call MessageDigest as a local variable in main() method of my code, but whenever I try creating a field variable of MessageDigest in a class, and try initializing it in a constructor, it throws a NoSuchAlgorithm exception. My gut…
khanna
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When to use salt with Message Digest

I have using message digest, I have seen it being used sometimes with salt synchronized (hasher) { hasher.update(salt); // "Updates" the digest using the specified byte. salt++; digest =…
JavaDeveloper
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Zip File md5 Checksum - Every Time Different

I have an Android applications which gets zip file's md5 checksum. I use it to compare the file with file on a server. My problem is that every time I try to generate the md5 for the same file, the checksum is different. I'm posting my methods here.…
dephinera
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same message digest but different signature value

I have 2 signature file that only different in namespace. Both these file provide the same message digest. I use the same key to sign with the same algo RSA-SHA1. But there are 2 different signature. I think that as long as the message digest, key…
Kristine T
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Why are my two MD5 hashing methods producing different hashes?

I'm new to java and really need some help. I created a command line tool in order to get an MD5 hash of a file. This worked so I then tailored my code to put it in GUI form. The two programs give different hashes of the same file which is confusing.…
DMo
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S/MIME verification with x509 certificate

I have some problems with verifying S/Mime signed message with x509 certificate. This is my code: public class verifyMsg { private static void verify(SMIMESignedParser s) throws Exception { Security.addProvider(new BouncyCastleProvider()); …
s7474
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Is Java MessageDigest.digest() guaranteed to return an unreferenced byte array?

When I call MessageDigest.digest() and similar methods that produce the final hash, is the resulting byte array guaranteed to be a new copy, free of other references? Or do I still need to make a defensive copy using e.g.…
Garret Wilson
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Incorrect XML digest value

Description I'm trying to calculate a digest value for a XML digital signature. The problem is that I can't calculate a correct digest value. For the testing purpose I'm using a sample request which is populated with the valid data and my goal is to…
Tommy Chu
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MessageDigest MD5 generation of Multipart Huge file

I wish to generate an MD5 hash of a very large file using MessageDigest. However, because the file is so big, i never have access to the complete stream of bytes. I only have access to N segments of the file. (Processed using multipart uploads). In…
MeBigFatGuy
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Can android throw NoSuchAlgorithmException for MD5

Android's MessageDigest page says MD5 is supported from day one - https://developer.android.com/reference/java/security/MessageDigest But the MessageDigest.getInstance("MD5") method can throw NoSuchAlgorithmException and there is no getMD5Instance…
arunskrish
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