- Added flag to disable Chinese Remainder Theorem when using RSA private operation (POLARSSL_RSA_NO_CRT)

include/polarssl/config.h

@@ -143,6 +143,16 @@
  *
 #define POLARSSL_AES_ROM_TABLES
  */
+
+/**
+ * \def POLARSSL_RSA_NO_CRT
+ *
+ * Do not use the Chinese Remainder Theorem for the RSA private operation.
+ *
+ * Uncomment this macro to disable the use of CRT in RSA.
+ *
+#define POLARSSL_RSA_NO_CRT
+ */
 /* \} name */
 
 /**

library/rsa.c

@@ -253,7 +253,7 @@ int rsa_private( rsa_context *ctx,
         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
     }
 
-#if 0
+#if defined(POLARSSL_RSA_NO_CRT)
     MPI_CHK( mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
 #else
     /*