* Exposed useful sizes MAX_X509_HEADER_SZ and PEM_LINE_SZ

* Refactor the PEM saving code in `test.c`, so its not using large 4K buffer and calculates based on DER.
* Enable ECC key generation test even without `WOLFSSL_KEY_GEN`.
* Added `ECC_KEYGEN_SIZE` macro for ECC key generation testing.
* Refactor ECC DER key generation to use `ECC_BUFSIZE`.

wolfcrypt/src/coding.c

@@ -29,6 +29,7 @@
 #ifndef NO_CODING
 
 #include <wolfssl/wolfcrypt/coding.h>
+#include <wolfssl/wolfcrypt/asn.h> /* For PEM_LINE_SZ */
 #include <wolfssl/wolfcrypt/error-crypt.h>
 #include <wolfssl/wolfcrypt/logging.h>
 
@@ -36,7 +37,6 @@
 enum {
     BAD         = 0xFF,  /* invalid encoding */
     PAD         = '=',
-    PEM_LINE_SZ = 64,
     BASE64_MIN  = 0x2B,
     BASE16_MIN  = 0x30,
 };