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PikeProof

PikeProof is a project to utilize the Wycheproof cryptographic testcases in Pike, in order to test both the Nettle cryptographic library, and Pike's glue(bindings) to the library.

Various vectors of tests are grouped together into common testing types, each corresponding to a file in the project. Because each testing type generally follow the same formula (e.g. encrypt(); decrypt(); verify()), each vector shares similar functions.

In specific cases of common testing types needing irregular actions to be taken, the special_action_table array (in tables.pike) handles one(or more)-off functions which can be used to prepare the special cases. For example, the AeadTest-type algorithm "AES-GCM" is special from other AeadTest-types, in that it cannot calculate a truncated digest, and thus special handling must be done to the test's data before the testing begins.

The program is made in such a way that new testcases can be added more-or-less in a plug-and-play fashion. For example, if new IndCpaTest (corresponding to the ind_cpa_test_schema.json test group) test vectors are released in the future, it is only necessary to update the file tables.pike with an addition to the array test_vectors of the new vector's filename (and possibly to the mapping algo_functions if a different algorithm is used).

Commit 5c180c4e54f94ace678d7a6feb4a033958e83d00 is an excellent example of just how easy it is to add new test vectors which are automatically cycled through via the main script.

A blog post detailing more of the development process of this project can be found here.

Usage

# Runs all of the Wycheproof tests in Pike.
pike main.pike

# Runs all the tests with verbose debugging information.
pike main.pike D

# Runs all the tests without color output.
main.pike NO_COL

# Runs tests for a specific algorithm (NOT 'type').
main.pike RSAES-PKCS1-v1_5

# Runs tests for a specific algorithm, providing debugging information without color output.
main.pike NO_COL RSAES-PKCS1-v1_5 D

Results

A list of issues found by this program are listed below.

Crypto.AES.CCM

  1. Null Pointer Dereference Pike
  2. Incorrect Digest Pike
  3. Documentation Lacks IV Truncation Information Pike

Crypto.DSA

  1. Infinite Loop Pike
  2. Modified r,s Values Verify With Degrees Of Malleability Pike
  3. PKCS Signatured Verified With Degrees Of Malleability Pike

Crypto.ECC.ECDSA

  1. PKCS Signatured Verified With Degrees Of Malleability Pike

Gmp.mpz.probably_prime_p

  1. Inconsistent Prime Handling Pike

Crypto.ECC.SECP_521R1

  1. Incorrect Signature Verification Pike

Crypto.RSA

  1. Decryption With Degrees Of Malleability Pike

Ideas (some have been utilised)

  1. In various cases, different forms/types of data are provided with respect to keys. For example, public/private keys may be provided in both pem and DER formatting. One test could ensure these keys are parsed to be the same.
  2. Properly implement ECDH tests.
  3. Implement tests for RSASSA-PSS, RSAES-OAEP, KW
  4. Run the tests on hardware which Nettle has assembly optimization -- for example, ARM and SPARC.

License

The Wycheproof project and its testcases are provided under the apache-2.0 license.