* Fixes to support certificate generation (`WOLFSSL_CERT_GEN`) without RSA enabled.
* Added new ECC CA for 384-bit tests.
* Created new server cert chain (ECC CA for 256-bit that signs server-ecc.pem)
* Created new `./certs/ecc/genecc.sh` script for generating all ECC CA's, generated server cert req (CSR), signing with CA and the required CRL.
* Moved the wolfCrypt ECC CA / ECC cert gen test into `ecc_test` as `ecc_test_cert_gen`.
* Refactor duplicate code that saves DER to disk, converts DER to PEM and saves PEM to disk into SaveDerAndPem function.
* Changed `ecc_test_make_pub` and `ecc_test_key_gen` to use XMALLOC for temp buffers (uses heap instead of stack).
* Cleanup to combine all certificate subject information into global `certDefaultName`.
* Updated cert request info to use wolfSSL instead of Yassl.
* Cleanup to combine keyUsage into `certKeyUsage` and `certKeyUsage2`.
* Re-number error codes in rsa_test.
* Moved the certext_test after the ecc_test, since it uses a file generated in `ecc_test_cert_gen`.
1. Added a check on the hex2bn function for null strings to be treated like the NULL pointer.
2. Added some more test cases to the big number unit test.
3. Added wolfSSL_EVP_add_cipher() analogous to wolfSSL_EVP_add_digest().
4. Implemented `RSA_public_encrypt()` and `RSA_private_decrypt()` for the OpenSSL compatibility layer.
5. Added `RSA_PKCS1_OAEP_PADDING` as an option to the new functions.
6. Fixed the constness on the `from` parameter in function `RSA_public_decrypt()`. Note: this does not allow OAEP to be used in FIPS mode.
7. Added size constants for EVP_MAX_BLOCK_LENGTH, RSA_PKCS1_PADDING_SIZE, and RSA_PKCS1_OAEP_PADDING_SIZE.
8. Added functions `wolfSSL_EVP_PKEY_new_mac_key()` and `wolfSSL_EVP_PKEY_get0_hmac()` for storing HMAC keys in an EVP_PKEY structure for use later.
9. Added the routines EVP_DigestSignXXX(). They only work w.r.t HMAC.
10. Added the ForceZero() to EVP_MD_CTX_cleanup().
11. Modified the EVP_MD_CTX structure to have a union with both the hasher and a wolfCrypt Hmac structure.
12. Added a mapping of SHA1->SHA to the list of digest name aliases in wolfSSL_EVP_get_digestbyname().
13. Changed the mapping of ssl3-sha1->SHA.
14. When using RSA blinding, the OpenSSL compatibility layer RSA object was attempting to decrypt without an RNG. Added an RNG if needed.
15. Add comment to wolfSSL_BN_hex2bn() to cover usage w.r.t. string length. Remember to keep the length even, front-pad with zeroes if needed.
16. Added tests for the new functions.
