Fix AES_BLOCK_SIZE undeclared under OPENSSL_COEXIST wolfSSL

[aidangarske]

tpm2_crypto.c (and the fwTPM sources) use the classic AES_BLOCK_SIZE, which recent wolfSSL only exposes when OPENSSL_COEXIST is not defined — under coexist it provides WC_AES_BLOCK_SIZE (an enum) plus the marker macro WC_NO_COMPAT_AES_BLOCK_SIZE. Building wolfTPM against a coexist-enabled wolfSSL (e.g. the wolfProvider Yocto stack) therefore fails with 'AES_BLOCK_SIZE' undeclared.

Adds a one-line compat shim in wolftpm/tpm2_types.h (after the wolfSSL includes) that aliases the classic name to WC_AES_BLOCK_SIZE only when wolfSSL has withheld it:

#if defined(WC_NO_COMPAT_AES_BLOCK_SIZE) && !defined(AES_BLOCK_SIZE)
    #define AES_BLOCK_SIZE WC_AES_BLOCK_SIZE
#endif

Since it's in the central types header, it covers every wolfTPM source in one place, and stays inert on non-coexist and older wolfSSL.

Validation: compiled tpm2_crypto.c against real coexist wolfSSL headers — without the shim it reproduces 'AES_BLOCK_SIZE' undeclared; with it, compiles cleanly (AES_BLOCK_SIZE == 16). Also confirmed end-to-end in the wolfProvider Yocto build (wolfTPM do_compile succeeded).

[Copilot]

Pull request overview

This PR fixes a build break when wolfTPM is compiled against coexist-enabled wolfSSL (OPENSSL_COEXIST), where the classic AES_BLOCK_SIZE macro may not be provided and only WC_AES_BLOCK_SIZE is exposed.

Changes:

• Add a guarded compatibility alias in tpm2_types.h to define AES_BLOCK_SIZE as WC_AES_BLOCK_SIZE when wolfSSL disables the classic name.