Add gcm_hw_pmul_is_supported()

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

Author: sjaeckel

src/encauth/gcm/gcm_gf_mult.c

@@ -492,3 +492,14 @@ void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *
 
 #endif
 
+int gcm_hw_pmul_is_supported(void)
+{
+#if defined(LTC_GCM_PCLMUL_TARGET)
+   return s_pclmul_is_supported();
+#elif defined(LTC_GCM_PMULL_TARGET)
+   return s_pmull_is_supported();
+#else
+   return 0;
+#endif
+}
+

src/headers/tomcrypt_mac.h

@@ -403,6 +403,7 @@ int ccm_test(void);
 void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *c);
 #endif
 
+int gcm_hw_pmul_is_supported(void);
 
 /* table shared between GCM and LRW */
 #if defined(LTC_GCM_TABLES) || defined(LTC_LRW_TABLES) || ((defined(LTC_GCM_MODE) || defined(LTC_GCM_MODE)) && defined(LTC_FAST))

tests/test.c

@@ -352,7 +352,9 @@ int main(int argc, char **argv)
    printf("LTC_VERSION  = %s\n%s\n\n", GIT_VERSION, crypt_build_settings);
 
    printf("AES-NI CPU support = %d\n", aesni_is_supported());
-   printf("SHA-NI CPU support = %d\n\n", shani_is_supported());
+   printf("SHA-NI CPU support = %d\n", shani_is_supported());
+   printf("PMUL CPU support = %d\n", gcm_hw_pmul_is_supported());
+   putchar('\n');
 
 #ifdef USE_LTM
    mpi_provider = "ltm";