Allow applications to specify alternative FIPS RAND methods if they
[openssl.git] / fips / rand / fips_rand_lib.c
index cc8d717..a606d31 100644 (file)
 
 static const RAND_METHOD *fips_rand_meth = NULL;
 static int fips_approved_rand_meth = 0;
+static int fips_rand_bits = 0;
 
-int FIPS_rand_set_method(const RAND_METHOD *meth)
+/* Allows application to override number of bits and uses non-FIPS methods */
+void FIPS_rand_set_bits(int nbits)
        {
-       if (meth == FIPS_drbg_method())
-               fips_approved_rand_meth = 1;
-       else if (meth == FIPS_x931_method())
-               fips_approved_rand_meth = 2;
-       else
-               fips_approved_rand_meth = 0;
+       fips_rand_bits = nbits;
+       }
 
-       if (!fips_approved_rand_meth && FIPS_module_mode())
+int FIPS_rand_set_method(const RAND_METHOD *meth)
+       {
+       if (!fips_rand_bits)
                {
-               FIPSerr(FIPS_F_FIPS_RAND_SET_METHOD, FIPS_R_NON_FIPS_METHOD);
-               return 0;
+               if (meth == FIPS_drbg_method())
+                       fips_approved_rand_meth = 1;
+               else if (meth == FIPS_x931_method())
+                       fips_approved_rand_meth = 2;
+               else
+                       {
+                       fips_approved_rand_meth = 0;
+                       if (FIPS_module_mode())
+                               {
+                               FIPSerr(FIPS_F_FIPS_RAND_SET_METHOD,
+                                               FIPS_R_NON_FIPS_METHOD);
+                               return 0;
+                               }
+                       }
                }
        fips_rand_meth = meth;
        return 1;
        }
 
+const RAND_METHOD *FIPS_rand_get_method(void)
+       {
+       return fips_rand_meth;
+       }
+
 void FIPS_rand_seed(const void *buf, int num)
        {
        if (!fips_approved_rand_meth && FIPS_module_mode())
@@ -147,6 +164,8 @@ int FIPS_rand_status(void)
 
 int FIPS_rand_strength(void)
        {
+       if (fips_rand_bits)
+               return fips_rand_bits;
        if (fips_approved_rand_meth == 1)
                return FIPS_drbg_get_strength(FIPS_get_default_drbg());
        else if (fips_approved_rand_meth == 2)