SHA-1 | SHA-256 | SHA-512 | SHA-3
Calculate Hash SHA-1
SHA, Secure Hash Algorithm, are different methods of determining a check value of a file and thus creating a digital signature. SHA-1, the 1995 corrected version of the original SHA-0, is now considered obsolete and no longer completely secure, but is still in use.
Enter as message any text or copy it into this field. The message will be converted into the 40-digit hash according to SHA-1.
A hash function maps an input set to a usually smaller target set. These sets contain characters. The target set usually has a fixed size, as is always the case with SHA functions. The mapping to the target set usually involves loss, meaning it cannot be reversed. Hash functions are therefore not used to encrypt messages that can then be decrypted. Their application is to ensure or verify that messages have not been altered. This is used, for example, in a digital signature.
Ideally, with hash functions, every result from the target set is possible and equally likely. SHA-1 has 40 digits, and each digit can be a digit or a letter from a to f, so this method works with hexadecimal values. This results in 1640 possibilities for an SHA-1 hash, which is 1.46 * 1048 possibilities, i.e., a one with 48 zeros. SHA-3 has 128 digits, with correspondingly more possible combinations.
Generating a hash using SHA functions is a complex algorithm, but it is already implemented in many programming languages and is therefore readily available. In this calculator, this is JavaScript. The algorithm ensures that a small change to the input text causes a large change in the hash, resulting in a completely different hash. This property is known as the avalanche effect. You can test this by copying a longer text into the upper field and then simply changing or removing a single letter.
Last updated on 08/24/2025. Author: Jürgen Kummer
CryptoJS 3.1 © 2013 by Jeff Mott
Calculate hashes | © Jumk.de Webprojects | Online Calculators | German: Hashes berechnen