Cryptographic Token Interface Standard

PKCS#11

AES-OFB

AES-OFB, denoted CKM_AES_OFB. It is a mechanism for single and multiple-part encryption and decryption with AES. AES-OFB mode is described in [NIST sp800-38a].

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 240, AES-OFB: Key And Data Length   
Function Key type 

Input length

 

Output length

 

Comments

   


C_Encrypt AES 

any

 

same as input length

 

no final part

   


C_Decrypt AES 

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