dbatools

1.1.25

internal/functions/Get-PasswordHash.ps1

                                function Get-PasswordHash {

    <#

    .SYNOPSIS

    Generates a password hash for SQL Server login

    .DESCRIPTION

    Generates a hash string based on the plaintext or securestring password and a SQL Server version. Salt is optional

    .PARAMETER Password

    Either plain text or Securestring password

    .PARAMETER SqlMajorVersion

    Major version of the SQL Server. Defines the hash algorithm.

    .PARAMETER byteSalt

    Optional. Inserts custom salt into the hash instead of randomly generating new salt

    .NOTES

    Tags: Login, Internal

    Author: Kirill Kravtsov (@nvarscar)

    dbatools PowerShell module (https://dbatools.io)

   Copyright: (c) 2018 by dbatools, licensed under MIT

    License: MIT https://opensource.org/licenses/MIT

    .EXAMPLE

    Get-PasswordHash $securePassword 11

    Generates password hash for SQL 2012

    .EXAMPLE

    Get-PasswordHash $securePassword 9 $byte

    Generates password hash for SQL 2005 using custom salt from the $byte variable

    #>

    param (

        [object]$Password,

        $SqlMajorVersion,

        [byte[]]$byteSalt

    )

    #Choose hash algorithm

    if ($SqlMajorVersion -lt 11) {

        $algorithm = 'SHA1'

        $hashVersion = '0100'

    } else {

        $algorithm = 'SHA512'

        $hashVersion = '0200'

    }

    #Generate salt

    if (!$byteSalt) {

        0 .. 3 | ForEach-Object { $byteSalt += Get-Random -Minimum 0 -Maximum 255 }

    }

    #Convert salt to a hex string

    [string]$stringSalt = ""

    $byteSalt | ForEach-Object { $stringSalt += ("{0:X}" -f $_).PadLeft(2, "0") }

    #Extract password

    if ($Password.GetType().Name -eq 'SecureString') {

        $cred = New-Object System.Management.Automation.PSCredential -ArgumentList 'foo', $Password

        $plainPassword = $cred.GetNetworkCredential().Password

    } else {

        $plainPassword = $Password

    }

    #Get byte representation of the password string

    $enc = [system.Text.Encoding]::Unicode

    $data = $enc.GetBytes($plainPassword)

    #Run hash algorithm

    $hash = [Security.Cryptography.HashAlgorithm]::Create($algorithm)

    $bytes = $hash.ComputeHash($data + $byteSalt)

    #Construct hex string

    $hashString = "0x$hashVersion$stringSalt"

    $bytes | ForEach-Object { $hashString += ("{0:X2}" -f $_).PadLeft(2, "0") }

    #Add UPPERCASE hash for SQL 2000 and lower

    if ($SqlMajorVersion -lt 9) {

        $data = $enc.GetBytes($plainPassword.ToUpper())

        $bytes = $hash.ComputeHash($data + $byteSalt)

        $bytes | ForEach-Object { $hashString += ("{0:X2}" -f $_).PadLeft(2, "0") }

    }

    return $hashString

}

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