wolfSSH support for using TPM based key for authentication

[aidangarske]

Description

wolfSSH tpm support using client side public key authentication with rsa. Code working just like the non tpm public key authentication with rsa

Testing

Github CI test tpm-ssh.yml

Just SSH

For ssh public key auth with rsa use ./examples/echoserver/echoserver and for client side use the command:

./examples/client/client -u hansel -i ./keys/hansel-key-rsa.der -j ./keys/hansel-key-rsa.pub

With TPM

For tpm based public key auth with rsa use a tpm simulator and ./examples/echoserver/echoserver and for client use the command:

./examples/client/client -i ../wolfTPM/keyblob.bin -u hansel -K ThisIsMyKeyAuth

Note: refer to the README for detailed build steps and further information.

[dgarske]

Various errors building without TPM:

src/ssh.c:1810:15: error: call to undeclared function 'wc_PubKeyPemToDer'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        ret = wc_PubKeyPemToDer(in, inSz, newKey, newKeySz);
              ^
src/ssh.c:1810:15: note: did you mean 'wc_KeyPemToDer'?
/Users/runner/work/wolfssh/wolfssh/build-dir/include/wolfssl/wolfcrypt/asn_public.h:692:21: note: 'wc_KeyPemToDer' declared here
    WOLFSSL_API int wc_KeyPemToDer(const unsigned char* pem, int pemSz,
                    ^
1 error generated.
make[1]: *** [src/libwolfssh_la-ssh.lo] Error 1
make[1]: *** Waiting for unfinished jobs....
src/internal.c:12950:25: error: unused variable 'sigSz' [-Werror,-Wunused-variable]
                    int sigSz;
                        ^
1 error generated.

[dgarske]

This PR is very close to ready. Let's change it to use endorsement primary key are parent to avoid the SRK handle/auth.

[dgarske]

PR is great! Please add a GitHub CI action test based on the READM.md. That way this can be tested continuously to make sure it doesn't break.