Add NULL_CIPHER_TYPE support to wolfSSL_EVP_CipherUpdate()

[devin-ai-integration]

Add NULL_CIPHER_TYPE support to wolfSSL_EVP_CipherUpdate()

This PR implements support for the NULL_CIPHER_TYPE in wolfSSL_EVP_CipherUpdate() and adds comprehensive test cases in tests/api/test_evp.c.

Changes:

1. Added NULL_CIPHER_TYPE case in wolfSSL_EVP_CipherUpdate() function

   • Implemented direct memory copy using XMEMCPY
   • Set output length equal to input length
   • Return WOLFSSL_SUCCESS

2. Created test_evp.c and test_evp.h in tests/api directory with test cases:

   • TestNullCipherUpdate(): Basic functionality test
   • TestNullCipherUpdateEmptyData(): Test with empty data
   • TestNullCipherUpdateLargeData(): Test with large data buffer
   • TestNullCipherUpdateMultiple(): Test multiple update calls

3. Updated include.am to include the new test files

Testing:

All tests pass successfully with make check

Link to Devin run: https://app.devin.ai/sessions/f8dcc9faba394523a0672d7c81fe1511
Requested by: [email protected]

[devin-ai-integration]

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[wolfSSL-Bot]

Can one of the admins verify this patch?

[lealem47]

Salvaged in #8518