PKCS#8-formatted key.
There's already a function wc_CreatePKCS8Key, but this only creates the
unencrypted PKCS#8 key. TraditionalEnc exists, which takes a non-PKCS#8 key,
converts it to PKCS#8 format, and encrypts it, but this function isn't in the
public-facing API. I've modified TraditionalEnc to use wc_EncryptPKCS8Key after
wc_CreatePKCS8Key. wc_EncryptPKCS8Key is essentially the encryption portion of
TraditionalEnc moved out into its own function. wc_EncryptPKCS8Key will be in
the API going forward so that users can do PKCS#8 encryption without relying on
the non-API TraditionalEnc. Next, I'll be adding a corresponding
wc_DecryptPKCS8Key to handle decryption.
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