Cryptographic Token Interface Standard

PKCS#11

DES and Triple length DES in CFB Mode

Cipher DES has a cipher feedback mode, DES-CFB, denoted CKM_DES_CFB8 and CKM_DES_CFB64. 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 106, CFB: 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 - v220