md5

Calculating MD5 of UTF-8 encoded string

Does anyone know how to reproduce this C# algorithm in Ruby? HashAlgorithm algorithm = MD5.Create(); Encoding encoding = new UTF8Encoding(); var sb = new StringBuilder(); foreach (var element in algorithm.ComputeHash(encoding.GetBytes(password))) { sb.Append(element.ToString("X2")); } return sb.ToString(); It calculates the MD5 ha...

What is the >> operator / operand / modifier do?

I'm reviewing some javascript code and the programmer uses >> in a few places. I tried to search on google but couldn't find what this operand / operator does. So here I be. Code example below: var triplet=(((binarray[i>>2]>>8*(i%4))&0xFF)<<16)|(((binarray[i+1>>2]>>8*((i+1)%4))&0xFF)<<8)|((binarray[i+2>>2]>>8*((i+2)%4))&0xFF); ...

md5 module error

I'm using an older version of PLY that uses the md5 module (among others): import re, types, sys, cStringIO, md5, os.path ... although the script runs but not without this error: DeprecationWarning: the md5 module is deprecated; use hashlib instead How do I fix it so the error goes away? Thanks ...

Possible to identify hash type?

I know you can compare the length but many hash types have the same lengths. So with just knowing that it is a hash is there a way to identify the type and also if its salted? example of the hash that I am working with is: hash=2bf231b0e98be99a969bd6724f42a691 hash=4ac5a4ff764807d6ef464e27e4d1bee3 hash=4d177cec31d658ed22cc229e45d7265e...

Very simple password generation scheme; is this secure?

Edit/clarification: I mean password generation as in "deterministically generate passwords for your own use (e.g. to sign up for web services), based on some secret and on some site-specific data" I take the MD5 digest of the concatenation of my master password and a (non-secret) site-specific string. Then I take the first 16 digits of ...

How do one-way hash functions work?

I read the Wikipedia article about md5 hashes but I still can't understand how a hash can't be "reconstituted" back to the original text. Could someone explain to someone who knows very little about cryptography how this works? What part of the function makes it one-way? ...

Reasons why SHA512 is superior to MD5

I was wondering if I could reasons or links to resources explaining why SHA512 is a superior hashing algorithm to MD5. ...

Possible to calculate MD5 (or other) hash with buffered reads ?

I need to calculate checksums of quite large files (gigabytes). This can be accomplished using the following method: private byte[] calcHash(string file) { System.Security.Cryptography.HashAlgorithm ha = System.Security.Cryptography.MD5.Create(); FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Rea...

Google Web Toolkit (gwt) - how does the post token is generated?

Hi, I am having a request like: 5|0|7|http://localhost:8080/testproject/|29F4EA1240F157649C12466F01F46F60|com.test.client.GreetingService|greetServer|java.lang.String|myInput1|myInput2|1|2|3|4|2|5|5|6|7| I would like to know how the gwt generates the md5 value of "29F4EA1240F157649C12466F01F46F60"? is it based on the client ip and da...

MD5 implementation in C for a XML file

Hi, I need to implement the MD5 checksum to verify a MD5 checksum in a XML file including all XML tags and which has received from our client. The length of the received MD5 checksum is 32 byte hexadecimal digits. We need set MD5 Checksum field should be 0 in received XML file prior to checksum calculation and we have to indepandantly...

Are there algorithms for putting a digest into the file being digested?

Are there algorithms for putting a digest into the file being digested? In otherwords, are there algorithms or libraries, or is it even possible to have a hash/digest of a file contained in the file being hashed/digested. This would be handy for obvious reasons, such as built in digests of ISOs. I've tried googling things like "MD5 inje...

Java ME MD5 string using bouncy castle - cannot hash multiple times (3rd year project dissertation plz hlp)

Hi there, I've noticed that a lot of my Google searches took me here so i thought perhaps i could borrow your apt minds :) I'm working on a One Time Password generator for a mobile device (as well as website to log in to) as part of my third year degree dissertation. Using the org.bouncycastle.crypto.digests.MD5Digest library i am ta...

comparing PERL md5() and PHP md5()

Hello again. All of my application is written in PHP, bar 1 script which happens to create a md5 hash which is used later via PHP scripts. Problem being they dont match up. PERL: #$linkTrue = 'http://www.themobilemakeover.co.uk/mobile-makeover-appointment-booking-signup.php' md5_hex($linkTrue); And for testing purposes i did this i...

Combining MD5 hash values

When calculating a single MD5 checksum on a large file, what technique is generally used to combine the various MD5 values into a single value? Do you just add them together? I'm not really interested in any particular language, library or API which will do this; rather I'm just interested in the technique behind it. Can someone expla...

MD5 hashing of Sequential files and dynamic arrays in UniData

I am creating a sequential file which requires a digital signature (MD5 hash). While I am creating the sequential file I am also creating a dynamic array with the same data. If I perform a MD5 hash on both the sequential file and dynamic array can I expect the result to be the same or different? ...

MD5 of String in ActionScript returning incorrect results when some hex is part of the string( ie"abc\xBF\x4E")

Hi, I am trying to MD5 a string in ActionScript using the MD5 algorithm that was created by Adobe and is part of AS3corelib. (http://as3corelib.googlecode.com/svn/trunk/src/com/adobe/crypto/MD5.as). I am comparing this to an MD5 created in php that I know is correct. If I create MD5s using AS and PHP for say a string like "abcd1234" ...

Why, after using 'CryptSetHashParam', can I no longer add data to my MD5 hash object?

I am trying to use the Microsoft 'Crypt...' functions to generate an MD5 hash key from the data that is added to the hash object. I am also trying to use the 'CryptSetHashParam' to set the hash object to a particular hash value before adding data to it. According to the Microsoft documentation (if I am interpreting it correctly), you s...

Python MD5 not matching md5 in terminal

Hey guys, am getting MD5 of several files using python function filehash = hashlib.md5(file) print "FILE HASH: " + filehash.hexdigest() though when I go to the terminal and do a md5 file the result I'm getting is not the same my python script is outputting (they don't match). Any chance someone knows why? Thanks. ...

Java MD5 which one of these is correct?

I am trying to Sip Register and I get the challenge from the server. So I need to use the MD5 algorithm on the nonce and then send that to the server to authenticate. I have come across two examples of MD5 encryption and I have tried both and each one gives a different string back to me, so I was wondering which one is the correct one ...

MD5 Hashes failing for large Strings

I'm making a MD5 hash of a response, and then signing it with a shared secret. For most calls this works, but strangely fails (Generates a MD5 hash different from the client) on the only two calls that bring a lot of content in the body. Can this be because of the size of the body? or maybe because those calls return the content chunk...