C# Signature:

[DllImport("advapi32.dll", SetLastError=true, CharSet=CharSet.Auto)]
static extern bool CryptEnumProviders(
    [MarshalAs(UnmanagedType.U4)] int dwIndex,
    [MarshalAs(UnmanagedType.U4)] ref int pdwReserved,
    [MarshalAs(UnmanagedType.U4)] int dwFlags,
    [MarshalAs(UnmanagedType.U4)] ref int pdwProvType,
    StringBuilder pszProvName,
    [MarshalAs(UnmanagedType.U4)] ref int pcbProvName);

Another kind of declaration:

[DllImport("advapi32.dll", EntryPoint = "CryptEnumProviders", SetLastError = true)]
static extern bool CryptEnumProviders(
    uint dwIndex,
    IntPtr pdwReserved,
    uint dwFlags,
    ref uint pdwProvType,
    StringBuilder pszProvName,
    ref uint pcbProvName);

VB Signature:

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

[DllImport("Advapi32.dll")]
internal static extern bool CryptEnumProviders(
    int dwIndex,
    IntPtr pdwReserved,
    int dwFlags,
    ref int pdwProvType,
    StringBuilder pszProvName,
    ref int pcbProvName);

public static Dictionary<string, int> ReadAllProviders()
{
    Dictionary<string, int> installedCSPs = new Dictionary<string, int>();
    int cbName;
    int dwType;
    int dwIndex;
    StringBuilder pszName;
    dwIndex = 0;
    dwType = 1;
    cbName = 0;
    while (CryptEnumProviders(dwIndex, IntPtr.Zero, 0, ref dwType, null, ref cbName))
    {
        pszName = new StringBuilder(cbName);

        if (CryptEnumProviders(dwIndex++, IntPtr.Zero, 0, ref dwType, pszName, ref cbName))
        {
            installedCSPs.Add(pszName.ToString(),dwType);
        }
    }
    return installedCSPs;
}

Sample PowerShell Code:

function Get-CryptoServiceProvider {
$TypeDefinition=@"
using System.Runtime.InteropServices;
using System.Security;

namespace PKI {

     public static class CSP {
     [DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true), SuppressUnmanagedCodeSecurityAttribute]
         public static extern bool CryptEnumProviders(
         uint dwIndex,
         uint pdwReserved,
         uint dwFlags,
         ref uint pdwProvType,
         System.Text.StringBuilder pszProvName,
         ref uint pcbProvName);

     [DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true), SuppressUnmanagedCodeSecurityAttribute]
         public static extern bool CryptEnumProviderTypes(
         uint dwIndex,
         uint pdwReserved,
         uint dwFlags,
         ref uint pdwProvType,
         System.Text.StringBuilder pszTypeName,
         ref uint pcbTypeName);
     }
}
"@

     Add-Type -TypeDefinition $TypeDefinition -PassThru
     $CSP=@()
     $ProvTypes = @{}
#region default value definition for provider types
     [UInt32]$dwIndex = 0
     [UInt32]$pdwProvType = 0
     $pszTypeName = New-Object Text.StringBuilder
     [UInt32]$pcbTypeName = 0
#endregion

     # retrieve provider type enumeration to a hashtable
     while ([PKI.CSP]::CryptEnumProviderTypes($dwIndex,0,0,[ref]$pdwProvType,$null,[ref]$pcbTypeName)) {
     $pszTypeName.Length = $pcbTypeName
     if ([PKI.CSP]::CryptEnumProviderTypes($dwIndex++,0,0,[ref]$pdwProvType,$pszTypeName,[ref]$pcbTypeName)) {
         $Type = $pszTypeName.TosTring()
         $ProvTypes.Add($pdwProvType,$Type)
     }
     }

#region default value definition for providers
     [UInt32]$dwIndex = 0
     [UInt32]$pdwProvType = 0
     $pszProvName = New-Object Text.Stringbuilder
     [UInt32]$pcbProvName = 0
#endregion

     # retrieve providers
     while ([PKI.CSP]::CryptEnumProviders($dwIndex,0,0,[ref]$pdwProvType,$null,[ref]$pcbProvName)) {
     $pszProvName.Length = $pcbProvName
     if ([PKI.CSP]::CryptEnumProviders($dwIndex++,0,0,[ref]$pdwProvType,$pszProvName,[ref]$pcbProvName)) {
         $objCSP=New-Object System.Object
         $objCSP | Add-Member -NotePropertyName "Name" -NotePropertyValue $pszProvName.ToString()
         $objCSP | Add-Member -NotePropertyName "TypeNum" -NotePropertyValue $pdwProvType
         $objCSP | Add-Member -NotePropertyName "TypeName" -NotePropertyValue $ProvTypes[$pdwProvType]
         $CSP+=$objCSP
     }
     }
     $CSP | Format-Table -AutoSize
}

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