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A repository of PowerShell Scripts to automate a variety of IT related maintenance tasks.

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Get-UserSupportedEncryptionTypes.ps1

Description

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Script

Import-Module ActiveDirectory

# Windows Server 2008 and above
# This account supports Kerberos AES 128 bit encryption
# This account supports Kerberos AES 256 bit encryption
# msDS-SupportedEncryptionTypes
# CRC (KERB_ENCTYPE_DES_CBC_CRC, 0x00000001): Supports CRC32
# MD5 (KERB_ENCTYPE_DES_CBC_MD5, 0x00000002): Supports RSA-MD5
# RC4 (KERB_ENCTYPE_RC4_HMAC_MD5, 0x00000004): Supports RC4-HMAC-MD5
# A128 (KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96, 0x00000008): Supports HMAC-SHA1-96-AES128
# A256 (KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96, 0x00000010): Supports HMAC-SHA1-96-AES256

function resolve-EncryptionTypes {
    param (
        [int]$key
    )
    switch ($key) {
        "1" { $SupportedEncryptionTypes = @("DES_CRC") }
        "2" { $SupportedEncryptionTypes = @("DES_MD5") }
        "3" { $SupportedEncryptionTypes = @("DES_CRC", "DES_MD5") }
        "4" { $SupportedEncryptionTypes = @("RC4") }
        "8" { $SupportedEncryptionTypes = @("AES128") }
        "16" { $SupportedEncryptionTypes = @("AES256") }
        "24" { $SupportedEncryptionTypes = @("AES128", "AES256") }
        "28" { $SupportedEncryptionTypes = @("RC4", "AES128", "AES256") }
        "31" { $SupportedEncryptionTypes = @("DES_CRC", "DES_MD5", "RC4", "AES128", "AES256") }
        default { $SupportedEncryptionTypes = @("Undefined value of $key") }
    }
    $SupportedEncryptionTypes
}
$Users = Get-ADUser -Properties * -LdapFilter "(&(objectclass=user)(objectcategory=user)(msDS-SupportedEncryptionTypes=*)(!msDS-SupportedEncryptionTypes=0))" | Select-Object -Property Name, @{N = "EncryptionTypes"; E = { resolve-EncryptionTypes $($_."msDS-SupportedEncryptionTypes") } }
foreach ($User in $Users) {
    $User.Name
    foreach ($EncryptionType in $User.EncryptionTypes) {
        $EncryptionType
    }
}

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