SImple Have I Been Pwned API client in PowerShell. Check whether your passwords have been compromised.

HIBP.ps1

# Runs in PowerShell 5.1, PowerShell Core 6 on Windows and Linux, and PowerShell 7 preview

# Calculating SHA1 hash and returning it as a hexadecimal string

function Compute-SHA1Hash ([string] $string) {
    $sha1 = New-Object System.Security.Cryptography.SHA1CryptoServiceProvider
    $encoder = New-Object System.Text.UTF8Encoding
    $bytes = $encoder.GetBytes($string)
    $hash = ($sha1.ComputeHash($bytes) | % { $_.ToString("X2") }) -join ''
    return $hash
}

# Searching for compromised passwords per https://haveibeenpwned.com/API/v2#SearchingPwnedPasswordsByRange
# Returns number of known breaches containing the tested string: 0 means that the password seems okay so far; 3730471 means that your password is "password"
# Error handling is quite rudimentary, expand as you see fit.

function Get-PasswordPwnCount {
    [CmdletBinding()]
    param ([string] $pass)
    $hash  = Compute-SHA1Hash $pass
    try {
        $uri = "https://api.pwnedpasswords.com/range/$($hash.Substring(0,5))"
        $list  = -split (Invoke-RestMethod $uri -Verbose:($PSBoundParameters['Verbose'] -eq $true) -ErrorAction Stop) # split into separate strings
        $pwn = $list | Select-String $hash.Substring(5,35) # grep
        if ($pwn) { $count = [int] ($pwn.ToString().Split(':')[1]) } else { $count = 0 }
        return $count
    }
    catch {
        Write-Error "Error Calling HIBP API"
        return $null
    }
}

Get-PasswordPwnCount "AwesomePassword"
Get-PasswordPwnCount "AwesomerPassword" -Verbose