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PKCS#11 Interoperability/Conformance Testing

PKCS#11 Interoperability/Conformance Testing. John Hughes PKIForum meeting Montreal - 14 September 00. Typical PKCS#11 Architecture. Application. Status Info. Init Card. Login/logout setPIN. Read/Write Data. Enc/Dec Sign/Verify. PKCS#11. PKCS#11 Library. “Device”. PKCS#11

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PKCS#11 Interoperability/Conformance Testing

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  1. PKCS#11 Interoperability/Conformance Testing John Hughes PKIForum meeting Montreal - 14 September 00

  2. Typical PKCS#11 Architecture Application Status Info Init Card Login/logout setPIN Read/Write Data Enc/Dec Sign/Verify PKCS#11 PKCS#11 Library “Device” PKCS#11 Interoperability Testing

  3. PKCS#11 Device Library PKCS#11 Device Library PKCS#11 Device Library PKCS#11 Device Library Common Approach Application Status Info Init Card Login/logout setPIN Read/Write Data Enc/Dec Sign/Verify PKCS#11 PKCS#11 Library PKCS#11 Interoperability Testing

  4. Why are we feeling pain - 1? Application PKI/Crypto Platform PKCS#11 Supplier PKCS#11 DLL Driver We do not want device specific changes to our code base PKCS#11 Interoperability Testing

  5. Why are we feeling pain - 2? • We have a relativity sophisticated use - our full PSE “profile” is: • support for data objects - varying size • mechanisms • CKM_RSA_PKCS_KEY_PAIR_GEN • single part CKM_RSA_PKCS decryption • CKM_RSA_PKCS verification SIGN/SIGN_RECOVER • C_GenerateRandom • 2 key pairs stored on card • optional storage of certificates • Our Universal Token Support (UTS) uses a subset of this for existing Tokens (e.g iD2 tokens with PKCS#15) PKCS#11 Interoperability Testing

  6. What did we do? • Created a PKCS#11 workbench that simulated how our PKI/Crypto engine used PKCS#11. (“Entegrity PKCS#11 Workbench”) • Provided it as source (under license) to PKCS#11 device supplier PKCS#11 Interoperability Testing

  7. Qualification Process (simplified) Entegrity Supplier Provide Workbench source Ran tests Examined results Provided results Passed? Run PKI/Crypto platform Tests Qualified Device Aim of workbench to resolve “most” of errors prior to full tests PKCS#11 Interoperability Testing

  8. Evolution • As we test more and more devices we are adding in extra “nuances” and tests PKCS#11 Interoperability Testing

  9. Status • We have/are testing 13 PKCS#11devices from 6 suppliers working on either Wintel or Solaris platforms • Total of 20 implementations • Statistics: • only 6 implementations have fully passed our tests • we are waiting for patches from 4 of the suppliers PKCS#11 Interoperability Testing

  10. Common problems - 1 • Inverted parameters for public and private keys in C_GenerateKeyPair: • a change occurred between PKCS#11 1.x and 2.x, Netscape did not change and several vendors decided to be compatible with them rather than following the standard. • Version of PKCS#1 padding. • Most use 1.5 - but 1 started to use 2.0 • Incomplete or wrong mechanism lists and key usage attributes PKCS#11 Interoperability Testing

  11. Common problems - 2 • Disallowing of generating keys with a given usage if the library does not support a mechanism. • Some vendors refuse to allow CKA_ENCRYPT attribute if they don't support decryption on the card. Our view is that if they don't support encryption, they just shouldn't list the mechanism as available, this will prevent us from using the key for that purpose even if the key itself is marked as supporting encryption. • Device supplier being more lenient on the Attributes assigned when an object is being created. • No support for Data Objects • PIN problems (min, max sizes and changing values) PKCS#11 Interoperability Testing

  12. Entegrity PKCS#11 Workbench tests • Login/logout/session • successful/unsuccessful logins • changing passwords, min password size • Data Objects • object creation/search/read/modify/deletion (small and large) within a session and across sessions (public and private) • Status Information • version, manufacturer, status flags • mechanism list • Cryptographic operations • key generation, random no generation • asymmetric - sign/verify/encrypt/decrypt tests (RSA) • symmetric - encrypt/decrypt (DES) PKCS#11 Interoperability Testing

  13. Workbench principles - 1 • Designed to be extensible. Although focused on RSA and 3DES relatively easy to change to use other algos: cout << "Starting BASIC CRYPTO: simple sign, verify, encrypt and decrypt" << endl; SHOULD_NOT_THROW( openSession( theSelectedSlotID, &s1 ), true ); SHOULD_NOT_THROW( login( s1, "1111" ), true ); SHOULD_NOT_THROW( destroyAllObjects( s1 ), true ); SHOULD_NOT_THROW( openSession( theSelectedSlotID, &s2, true ), true ); SHOULD_NOT_THROW( testAsymm( s1, s2, CKM_RSA_PKCS_KEY_PAIR_GEN, CKM_RSA_PKCS, 1024, 2 ), true ); SHOULD_NOT_THROW( destroyAllObjects( s1 ), true ); SHOULD_NOT_THROW( testSymm( s1, s2, CKM_DES3_KEY_GEN, CKM_DES3_ECB, 64, 2 ), true ); SHOULD_NOT_THROW( closeSession( s2 ), false ); SHOULD_NOT_THROW( logout( s1 ), false ); SHOULD_NOT_THROW( closeSession( s1 ), false ); cout << "Ended BASIC CRYPTO: simple sign, verify, encrypt and decrypt" << endl;} PKCS#11 Interoperability Testing

  14. Workbench principles - 2 • Error handling rv = (*theFunctionList->C_GetMechanismInfo)( theSelectedSlotID, aMechId, &info); errorCheck( rv, "C_GetMechanismInfo" ); // Error handling routine void errorCheck(CK_RV rv, string funcName, CK_RV expectedResponse ) { if( rv == CKR_FUNCTION_NOT_SUPPORTED ) throw Pkcs11_Exc_FNS( funcName ); else if( rv != expectedResponse ) { cout << "Expected " << hex << expectedResponse << " (" << getErrorDescription(expectedResponse) << ") from " << funcName << ", received rv = " << hex << rv << " (" << getErrorDescription(rv) << ")" << endl; throw Pkcs11_Exc( funcName, rv ); } } PKCS#11 Interoperability Testing

  15. So how can we progress? • In discussion with RSA concerning making the Entegrity PKCS#11 Workbench “open source” • How this can be accomplished and successfully managed is going to be discussed at the PKCS workshop in Boston • Issues: • who maintains and develops the source? • do we need an accreditation scheme for the emerging profiles - and who does the testing? It’s in all our interests that PKCS#11 devices become as “plug and play” as possible PKCS#11 Interoperability Testing

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