Public/Test-PwnedHashBytes.ps1
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function Test-PwnedHashBytes { param( [Parameter(Mandatory,Position=0,ValueFromPipeline,ValueFromPipelineByPropertyName)] [Alias('NTHash')] [byte[]]$HashBytes, [Parameter(ValueFromPipelineByPropertyName)] [Alias('SamAccountName')] [string]$Label, [ValidateNotNullOrEmpty()] [string]$ApiRoot = "https://api.pwnedpasswords.com/range/" ) Process { # validate the length of the byte array here since we can't do it in ValidateScript # due to this oddity: # https://github.com/PowerShell/PowerShell/issues/6185 if ($HashBytes.Length -ne 16 -and $HashBytes.Length -ne 20) { throw "HashBytes has an invalid length for SHA1 and NTLM." } # convert it to a hex string for submission $PasswordHash = [BitConverter]::ToString($HashBytes).Replace('-','') Write-Verbose "Converted hash bytes to $PasswordHash" Test-PwnedHash $PasswordHash -ApiRoot $ApiRoot -Label $Label } <# .SYNOPSIS Checks a SHA1 or NTLM hash byte array against a haveibeenpwned.com compatible Pwned Passwords API endpoint. .DESCRIPTION The Pwned Passwords API is a way to check a password hash against a list of more than half a billion passwords which have been previously exposed in data breaches. The API implements a k-Anonymity model that allows a password to be searched for by partial hash. This means your full password hash never leaves your machine and ensures your privacy. This function will check the specified hash against the API and return a number that indicates the amount of times that password was found in known data breaches. A high count indicates that password has been heavily used and should not be considered safe. TO BE CLEAR, only the first 5 characters of the password hash are submitted to the API. See https://haveibeenpwned.com/API/v3#PwnedPasswords for more detail. .PARAMETER HashBytes A byte array hash value. An error will be thrown if the byte array has a length other than 16 (NTLM) or 20 (SHA1). .PARAMETER Label This adds an optional Label field to the output to more easily identifiy this hash. .PARAMETER ApiRoot If specified, overrides the default pwnedpasswords.com API URL. URLs or filesystem paths can both be used as an alternative. The URL\Path should include everything preceding the 5 character hash prefix (e.g. 'https://example.com/range/' or 'C:\temp\'). .EXAMPLE $hashBytes = Get-SHA1Hash 'password' -AsBytes PS C:\>Test-PwnedHashBytes $hashBytes -Label 'myuser' Test a byte array hash against the official pwnedpasswords.com API .LINK Get-SHA1Hash .LINK Get-NTLMHash .LINK https://haveibeenpwned.com/API/v3#PwnedPasswords .LINK https://new.blog.cloudflare.com/validating-leaked-passwords-with-k-anonymity/ #> } |