FIPS Degraded Mode

1. Add error code for entering FIPS degraded mode.
2. Add string for the error code.

wolfcrypt/src/error.c

@@ -595,6 +595,9 @@ const char* wc_GetErrorString(int error)
     case SM4_CCM_AUTH_E:
         return "SM4-CCM Authentication check fail";
 
+    case DEGRADED_FIPS_E:
+        return "FIPS module in DEGRADED mode";
+
     default:
         return "unknown error number";
 

wolfcrypt/test/test.c

@@ -2026,7 +2026,7 @@ WOLFSSL_TEST_SUBROUTINE wc_test_ret_t error_test(void)
     int i;
     int j = 0;
     /* Values that are not or no longer error codes. */
-    int missing[] = { -122, -123, -124,       -127, -128, -129, -159,
+    int missing[] = { -122, -123, -124,             -128, -129, -159,
                       -163, -164, -165, -166, -167, -168, -169, -233,
                       0 };
 

wolfssl/wolfcrypt/error-crypt.h

@@ -66,6 +66,7 @@ enum {
 
     MEMORY_E           = -125,  /* out of memory error */
     VAR_STATE_CHANGE_E = -126,  /* var state modified by different thread */
+    DEGRADED_FIPS_E    = -127,  /* FIPS Module in degraded mode */
 
     RSA_WRONG_TYPE_E   = -130,  /* RSA wrong block type for RSA function */
     RSA_BUFFER_E       = -131,  /* RSA buffer error, output too small or