Cryptographic Token Interface Standard

PKCS#11

AES-CFB

Cipher AES has a cipher feedback mode, AES-CFB, denoted CKM_AES_CFB8, CKM_AES_CFB64, and CKM_AES_CFB128. It is a mechanism for single and multiple-part encryption and decryption with AES. AES-OFB mode is described [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 241, AES-CFB: 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