Cryptographic Token Interface Standard

PKCS#11

DES and Triple length DES in OFB Mode




   
   

Functions

 		              


Mechanism 

Encrypt

 

&

 

Decrypt

  

Sign

 

&

 

Verify

 

SR

 

&

 

VR1

 

Digest

 

Gen.

 

Key/

 

Key

  

Pair

 

Wrap

 

&

 

Unwrap

 

Derive

   


 CKM_DES_OFB64 

X

 		              


 CKM_DES_ OFB8 

X

 		              


 CKM_DES_ CFB64 

X

 		              


 CKM_DES_ CFB8 

X

 		             

 



  Cipher DES has a output feedback mode, DES-OFB, denoted  CKM_DES_OFB8 and CKM_DES_OFB64. It is a mechanism for single and multiple-part encryption and decryption with DES.


It has a parameter, an initialization vector for this mode. The initialization vector has the same length as the blocksize.


Constraints on key types and the length of data are summarized in the following table:


 







 Table 251, OFB: Key And Data Length   
Function Key type 

Input length

 

Output length

 

Comments

   


C_Encrypt CKK_DES, CKK_DES2, CKK_DES3 

any

 

same as input length

 

no final part

   


C_Decrypt CKK_DES, CKK_DES2, CKK_DES3 

any

 

same as input length

 

no final part

  

 



For this mechanism the CK_MECHANISM_INFO structure is as specified for CBC mode.


 
 



RSA Security Inc. Public-Key Cryptography Standards - 
PKCS#11 - v230