[NTDLL][ADVAPI32][ADVAPI32_APITEST][CRYPTLIB] Add hash API exports for NT6+ and apitests with small fixes

- For NT6.0+, NTDLL exports those hash APIs that ADVAPI32 thunks forward to
- Fix undocumented context structure layout and content
- Add apitests to verify both of hash result and structure content

sdk/lib/cryptlib/md5.c

@@ -152,6 +152,7 @@ VOID NTAPI MD5Final( MD5_CTX *ctx )
     MD5Transform( ctx->buf, (unsigned int *)ctx->in );
     byteReverse( (unsigned char *)ctx->buf, 4 );
     memcpy( ctx->digest, ctx->buf, 16 );
+    memset(ctx->in, 0, sizeof(ctx->in));
 }
 
 /* The four core functions - F1 is optimized somewhat */