s! name = name keylength = keylength Sets the cryptographic service provider (CSP) that will be used on the target computer. ...

%1!s! 
   [ name = ] name 
   [ [ keylength = ] keylength ] 
 
   Sets the cryptographic service provider (CSP) that will be used on the 
   target computer. You can obtain the name from the "show csps" command. 
 
   name - Specifies the name of the CSP. You can specify only one name. 
          (Required) 
   keylength - Specifies the length of the asymmetric key. The default is 
             2048. (Optional) 
 
   Example: 
      %1!s! name = "Microsoft RSA SChannel Cryptographic Provider" keylength = "2048"