Extensive reorganisation of PRNG handling in FIPS module: all calls

now use an internal RAND_METHOD. All dependencies to OpenSSL standard
PRNG are now removed: it is the applications resposibility to setup
the FIPS PRNG and initalise it.

Initial OpenSSL RAND_init_fips() function that will setup the DRBG
for the "FIPS capable OpenSSL".

fips/rand/fips_rand_lib.c

@@ -0,0 +1,140 @@
+/* ====================================================================
+ * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#define OPENSSL_FIPSAPI
+
+#include <openssl/crypto.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+#include <openssl/fips.h>
+#include <openssl/fips_rand.h>
+#include "e_os.h"
+
+/* FIPS API for PRNG use. Similar to RAND functionality but without
+ * ENGINE and additional checking for non-FIPS rand methods.
+ */
+
+static const RAND_METHOD *fips_rand_meth = NULL;
+static int fips_approved_rand_meth = 0;
+
+int FIPS_rand_set_method(const RAND_METHOD *meth)
+	{
+	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_approved_rand_meth && FIPS_mode())
+		{
+		FIPSerr(FIPS_F_FIPS_RAND_SET_METHOD, FIPS_R_NON_FIPS_METHOD);
+		return 0;
+		}
+	fips_rand_meth = meth;
+	return 1;
+	}
+
+void FIPS_rand_seed(const void *buf, int num)
+	{
+	if (!fips_approved_rand_meth && FIPS_mode())
+		{
+		FIPSerr(FIPS_F_FIPS_RAND_SEED, FIPS_R_NON_FIPS_METHOD);
+		return;
+		}
+	if (fips_rand_meth && fips_rand_meth->seed)
+		fips_rand_meth->seed(buf,num);
+	}
+
+void FIPS_rand_add(const void *buf, int num, double entropy)
+	{
+	if (!fips_approved_rand_meth && FIPS_mode())
+		{
+		FIPSerr(FIPS_F_FIPS_RAND_ADD, FIPS_R_NON_FIPS_METHOD);
+		return;
+		}
+	if (fips_rand_meth && fips_rand_meth->add)
+		fips_rand_meth->add(buf,num,entropy);
+	}
+
+int FIPS_rand_bytes(unsigned char *buf, int num)
+	{
+	if (!fips_approved_rand_meth && FIPS_mode())
+		{
+		FIPSerr(FIPS_F_FIPS_RAND_BYTES, FIPS_R_NON_FIPS_METHOD);
+		return 0;
+		}
+	if (fips_rand_meth && fips_rand_meth->bytes)
+		return fips_rand_meth->bytes(buf,num);
+	return 0;
+	}
+
+int FIPS_rand_pseudo_bytes(unsigned char *buf, int num)
+	{
+	if (!fips_approved_rand_meth && FIPS_mode())
+		{
+		FIPSerr(FIPS_F_FIPS_RAND_PSEUDO_BYTES, FIPS_R_NON_FIPS_METHOD);
+		return 0;
+		}
+	if (fips_rand_meth && fips_rand_meth->pseudorand)
+		return fips_rand_meth->pseudorand(buf,num);
+	return -1;
+	}
+
+int FIPS_rand_status(void)
+	{
+	if (!fips_approved_rand_meth && FIPS_mode())
+		{
+		FIPSerr(FIPS_F_FIPS_RAND_STATUS, FIPS_R_NON_FIPS_METHOD);
+		return 0;
+		}
+	if (fips_rand_meth && fips_rand_meth->status)
+		return fips_rand_meth->status();
+	return 0;
+	}