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Hash algorithm with alphanumeric output of 20 characters max

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问题 I need an hash algorithm that outputs an alphanumeric string that is max 20 characters long. For "alphanumeric" I mean [a-zA-Z0-9] . Inputs are UUIDs in canonical form (example 550e8400-e29b-41d4-a716-446655440000 ) In alternative is there a way to convert a SHA1 or MD5 hash to a string with these limitations? Thanks. EDIT Doesn't need to be cryptographically secure. Collisions make data inaccurate, but if they happen sporadically I can live with it. EDIT 2 I don't know if truncating MD5 or

How to get SHA-1/MD 5 fingerprint of android app in the logcat?

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问题 After making the app, I want the Logcat to print the SHA-1 key of the app in its logs. Instead of running keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android command. Regardless the app is in debug/ release mode. Is this possible to be done in android studio ? Ofcourse after testing I will remove the logcat line so that others possible can't debug it. 回答1: Personally, I would use SHA256 instead of SHA1. That's what I did in

Laravel 5: Using SHA1 instead of Bcrypt

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问题 I'm trying to extend the default Bcrypt HashServiceProvider in laravel 5, to make use of the SHA1 encryption instead. Using the answer from this question: How to use SHA1 encryption instead of BCrypt in Laravel 4? and the official documentation at http://laravel.com/docs/5.0/extending#container-based-extension, I'v managed to cook up the following code: In app/Providers/ShaHashServiceProvider.php use App\ShaHasher; use Illuminate\Hashing\HashServiceProvider; class ShaHashServiceProvider

werkzeug.security generate_password_hash alternative without SHA-1

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问题 I use generate_password_hash from werkzeug.security to hash and salt my passwords. I recently saw this article about SHA-1 collisions. werkzeug.security uses SHA-1 and since it is not as safe any more I would like an alternative. How can I hash my passwords without relying on SHA-1? from werkzeug.security import generate_password_hash generate_password_hash(secret) 回答1: The use of SHA-1 in generate_password_hash is not vulnerable , as it is only used as an intermediate, iterated step in the

Mysql – Detecting changes in data with a hash function over a part of table

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问题 I need generate a single hash over some data in a table CREATE TABLE Table1 ( F1 INT UNSIGNED NOT NULL AUTO_INCREMENT, F2 INT default NULL, F3 Varchar(50) default NULL, .. FN INT default NULL, PRIMARY KEY (F1) ); i.e. F1, F3,FN where F2=10 SELECT md5(CONCAT_WS('#',F1,F3,FN)) FROM Tabe1 WHERE F2=10 Gives a Hash for each row in the table. QUESTIONS 1) How do get a single hash over the whole table? 2) What is the fasts hashing algorithm to use MD5, SHA1, SHA or any other? EDIT: Mysql 4.1 is been

hash collision and appending data

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Assume I have two strings (or byte arrays) A and B which both have the same hash (with hash I mean things like MD5 or SHA1). If I concatenate another string behind it, will A+C and B+C have the same hash H' as well? What happens to C+A and C+B? I tested it with MD5 and in all my tests, appending something to the end made the hash the same, but appending at the beginning did not. Is this always true (for all inputs)? Is this true for all (well-known) hash functions? If no, is there a (well-known) hash function, where A+C and B+C will not collide (and C+A and C+B do not either)? (besides from

Using SHA-1 in .NET Core

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问题 I get strange results when hashing a string in dotnet core I have found this similar question: Computing SHA1 with ASP.NET Core and have found how to convert a byte array to string in .net core this is my code: private static string CalculateSha1(string text) { var enc = Encoding.GetEncoding(65001); // utf-8 code page byte[] buffer = enc.GetBytes(text); var sha1 = System.Security.Cryptography.SHA1.Create(); var hash = sha1.ComputeHash(buffer); return enc.GetString(hash); } and this is my test

hash collision and appending data

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问题 Assume I have two strings (or byte arrays) A and B which both have the same hash (with hash I mean things like MD5 or SHA1). If I concatenate another string behind it, will A+C and B+C have the same hash H' as well? What happens to C+A and C+B? I tested it with MD5 and in all my tests, appending something to the end made the hash the same, but appending at the beginning did not. Is this always true (for all inputs)? Is this true for all (well-known) hash functions? If no, is there a (well

How to easily apply Crypto++ hash functions?

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问题 Can someone help me how can I easily use hash functions from Crypto++ library? I tried used these codes for SHA1 and MD5. I have many errors on line where is StringSink . The errors are like: undefined reference to `CryptoPP::StringSinkTemplate::StringSinkTemplate(std::string&)' Thanks for help. // SHA CryptoPP::SHA1 sha1; std::string source = "Hello"; std::string hash = ""; CryptoPP::StringSource(source, true, new CryptoPP::HashFilter(sha1, new CryptoPP::HexEncoder(new CryptoPP::StringSink

How to set MessageDigest seed?

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问题 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 variables: h0 = 0x67452301 h1 = 0xEFCDAB89 h2 = 0x98BADCFE h3 = 0x10325476 h4 = 0xC3D2E1F0 However the MessageDigest class, as described in the Online Java Manual, provides no API for setting these initial variables. In fact, it doesn't state the value of the