Decrypting s/mime content

Wed, 27 Apr 2005 09:01:24 -0700

Hi everybody. I'm developing a pkcs11 module, and I'm having some problems when I try to decrypt a s/mime mail with thunderbird. My pkcs11 offer support for RC2 mechanism (I initialize the CK_RC2_CBC_PARAMS param correctly I think), but thunderbird don't show the message decrypted. The trace i obatain is:

C_UnwrapKey.
        --> pMechanism: CKM_RSA_PKCS
        --> hUnwrappingKey: 49398942,
        --> ulWrappedKeyLen: 128
        --> Wrapped key: <a5> <f3> <26>......(128 bytes)....<18>
        --> Template unwrapped key:
                -->Type = 0, Length = 4, Value = <4> <0> <0> <0>                
             (Creating SecretKey)    
                -->Type = 256, Length = 4, Value = <11> <0> <0> <0>             
             (CKK_RC2)
                -->Type = 261, Length = 1, Value = <1> (CKA_ENCRYPT)
        --> Unwrapped key length: 5
        --> Unwrapped key: <d3> <5f> <ff> <2d> <56>
        --> Handle new object: 47028462
END C_UnWrapKey.

C_DecryptInit.
        --> pMechanism: CKM_RC2_CBC
        --> hKey: 47028462
        --> IV Vector: <9c> <f7> <fb> <5e> <6a> <af> <eb> <f7>
        --> Effective key length: 40
END C_DecryptInit.


C_DecryptUpdate.
--> Input Data (24 bytes): <34> <a3> <31> <8d> <75> <68> <b4> <6> <10> <58> <43> <19> <a9> <5d> <0> <95> <8b> <b1> <8a> <1e> <3b> <83> <c5> <55>
--> Decrypted Data (24 bytes): <90> <8c> <7d> <6f> <aa> <f2> <c1> <a6> <d7> <67> <c1> <d6> <4> <6> <22> <1c> <df> <db> <ca> <b1> <96> <a6> <c2> <b8>
END C_DecryptUpdate.

.....

C_DecryptUpdate.
        --> Input Data (8 bytes): <19> <53> <24> <8f> <9d> <45> <b3>                  
     <6f>
        --> Decrypted Data (8 bytes): <5d> <1c> <37> <47> <fa> <a6> <db>   <91>
END C_DecryptUpdate.

The content it decrypts doesn't seems legible data. However, if I dont offer the CKM_RC2_MECHANISM, thunderbird obtain the 5 bytes of the RC2 key (using the CKM_RSA_PKCS mechanism to decryp the key)and itself decrypts the message correctly but without take part my pkcs11.

Is there something I' having bad with RC2?.

Thanks in advance.

Regards,
Antonio.



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