1. Password Hash Generator
2. Generate Hash Key In Sql Server
3. Generate Hash From A Keyboard

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Password Hash Generator

Syntax

Description

The Get-FileHash cmdlet computes the hash value for a file by using a specified hash algorithm.A hash value is a unique value that corresponds to the content of the file. Rather than identifyingthe contents of a file by its file name, extension, or other designation, a hash assigns a uniquevalue to the contents of a file. File names and extensions can be changed without altering thecontent of the file, and without changing the hash value. Similarly, the file's content can bechanged without changing the name or extension. However, changing even a single character in thecontents of a file changes the hash value of the file.

The purpose of hash values is to provide a cryptographically-secure way to verify that the contentsof a file have not been changed. While some hash algorithms, including MD5 and SHA1, are no longerconsidered secure against attack, the goal of a secure hash algorithm is to render it impossible tochange the contents of a file -- either by accident, or by malicious or unauthorized attempt -- andmaintain the same hash value. You can also use hash values to determine if two different files haveexactly the same content. If the hash values of two files are identical, the contents of the filesare also identical.

By default, the Get-FileHash cmdlet uses the SHA256 algorithm, although any hash algorithm thatis supported by the target operating system can be used.

Examples

Example 1: Compute the hash value for a file

This example uses the Get-FileHash cmdlet to compute the hash value for the/etc/apt/sources.list file. The hash algorithm used is the default, SHA256. The output ispiped to the Format-List cmdlet to format the output as a list.

Example 2: Compute the hash value for an ISO file

This example uses the Get-FileHash cmdlet and the SHA384 algorithm to compute the hash valuefor an ISO file that an administrator has downloaded from the internet. The output is piped to theFormat-List cmdlet to format the output as a list.

Example 3: Compute the hash value of a stream

For this example, we get are using System.Net.WebClient to download a package from thePowershell release page. The releasepage also documents the SHA256 hash of each package file. We can compare the published hash valuewith the one we calculate with Get-FileHash.

Example 4: Compute the hash of a string

PowerShell does not provide a cmdlet to compute the hash of a string. However, you can write astring to a stream and use the InputStream parameter of Get-FileHash to get the hash value.

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Parameters

Specifies the cryptographic hash function to use for computing the hash value of the contents of thespecified file or stream. A cryptographic hash function has the property that it is infeasible tofind two different files with the same hash value. Hash functions are commonly used with digitalsignatures and for data integrity. The acceptable values for this parameter are:

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• SHA1
• SHA256
• SHA384
• SHA512
• MD5

If no value is specified, or if the parameter is omitted, the default value is SHA256.

For security reasons, MD5 and SHA1, which are no longer considered secure, should only be used forsimple change validation, and should not be used to generate hash values for files that requireprotection from attack or tampering.

Specifies the input stream.

Specifies the path to a file. Unlike the Path parameter, the value of the LiteralPathparameter is used exactly as it is typed. No characters are interpreted as wildcard characters. Ifthe path includes escape characters, enclose the path in single quotation marks. Single quotationmarks instruct PowerShell not to interpret characters as escape sequences.

Specifies the path to one or more files as an array. Wildcard characters are permitted.

Inputs

You can pipe a string to the Get-FileHash cmdlet that contains a path to one or more files.

Outputs

Microsoft.Powershell.Utility.FileHash

Get-FileHash returns an object that represents the path to the specified file, the value of thecomputed hash, and the algorithm used to compute the hash.

Related Links

A checksum hash is an encrypted sequence of characters obtained after applying certain algorithms and manipulations on user provided content. In this post, we will learn to generate the checksum hash for files.

1. Why we may want to generate checksum hash for a file?

Any serious file providers provide a mechanism to have a checksum on their downloadable files. A checksum is a form of mechanism to ensure that the file we downloaded is properly downloaded. Checksum acts like a proof of validity of a file so if a file gets corrupted this checksum will change and thus letting us know that this is not the same file or file has been corrupted between transfer for any reason.

You can also create checksum of file to detect any possible change in file by third party e.g. license files. You provide licenses to clients which they may upload to your server. You can cross verify the checksum of file to verify that license file has not been modified after creation.

Generate Hash Key In Sql Server

Read More : MD5, SHA, PBKDF2, BCrypt examples

2. How to generate checksum hash for a file

To create checksum for a file, you will need to read the content of file byte by byte in chunks; and then generate hash for it using below manner.

This function takes two arguments:

Generate Hash From A Keyboard

1. The message digest algorithm’s implementation
2. A file for which checksum needs to be generated

You can use above function as below to generate MD5 file checksum :

To generate SHA file checksum, use the function as below:

Drop me a comment if something needs more explanation.

Happy Learning !!