libgcrypt/libgcrypt-1.6.1-fips-cfgrandom.patch

Index: libgcrypt-1.6.1/random/random-fips.c
===================================================================
--- libgcrypt-1.6.1.orig/random/random-fips.c
+++ libgcrypt-1.6.1/random/random-fips.c
@@ -27,10 +27,10 @@
    There are 3 random context which map to the different levels of
    random quality:
 
-   Generator                Seed and Key        Kernel entropy (init/reseed)
-   ------------------------------------------------------------
-   GCRY_VERY_STRONG_RANDOM  /dev/random         256/128 bits
-   GCRY_STRONG_RANDOM       /dev/random         256/128 bits
+   Generator                Seed and Key                      Kernel entropy (init/reseed)
+   ---------------------------------------------------------------------------------------
+   GCRY_VERY_STRONG_RANDOM  /etc/gcrypt/rngseed+/dev/urandom  256/128 bits
+   GCRY_STRONG_RANDOM       /etc/gcrypt/rngseed+/dev/urandom  256/128 bits
    gcry_create_nonce        GCRY_STRONG_RANDOM  n/a
 
    All random generators return their data in 128 bit blocks.  If the
@@ -40,8 +40,10 @@
    (SEED_TTL) output blocks; the re-seeding is disabled in test mode.
 
    The GCRY_VERY_STRONG_RANDOM and GCRY_STRONG_RANDOM generators are
-   keyed and seeded from the /dev/random device.  Thus these
-   generators may block until the kernel has collected enough entropy.
+   keyed and seeded with data that is loaded from the /etc/gcrypt/rngseed
+   if the device or symlink to device exists xored with the data
+   from the /dev/urandom device. This allows the system administrator
+   to always seed the RNGs from /dev/random if it is required.
 
    The gcry_create_nonce generator is keyed and seeded from the
    GCRY_STRONG_RANDOM generator.  It may also block if the
@@ -560,9 +562,13 @@ get_entropy (size_t nbytes)
   entropy_collect_buffer_len = 0;
 
 #if USE_RNDLINUX
+  _gcry_rndlinux_gather_random (entropy_collect_cb, 0,
+                                     X931_AES_KEYLEN,
+                                     -1);
+  entropy_collect_buffer_len = 0;
   rc = _gcry_rndlinux_gather_random (entropy_collect_cb, 0,
                                      X931_AES_KEYLEN,
-                                     GCRY_VERY_STRONG_RANDOM);
+                                     GCRY_STRONG_RANDOM);
 #elif USE_RNDW32
   do
     {
Index: libgcrypt-1.6.1/random/rndlinux.c
===================================================================
--- libgcrypt-1.6.1.orig/random/rndlinux.c
+++ libgcrypt-1.6.1/random/rndlinux.c
@@ -36,7 +36,9 @@
 #include "g10lib.h"
 #include "rand-internal.h"
 
-static int open_device (const char *name, int retry);
+#define NAME_OF_CFG_RNGSEED "/etc/gcrypt/rngseed"
+
+static int open_device (const char *name, int retry, int fatal);
 
 
 static int
@@ -59,7 +61,7 @@ set_cloexec_flag (int fd)
  * a fatal error but retries until it is able to reopen the device.
  */
 static int
-open_device (const char *name, int retry)
+open_device (const char *name, int retry, int fatal)
 {
   int fd;
 
@@ -67,6 +69,8 @@ open_device (const char *name, int retry
     _gcry_random_progress ("open_dev_random", 'X', 1, 0);
  again:
   fd = open (name, O_RDONLY);
+  if (fd == -1 && !fatal)
+      return fd;
   if (fd == -1 && retry)
     {
       struct timeval tv;
@@ -111,6 +115,7 @@ _gcry_rndlinux_gather_random (void (*add
 {
   static int fd_urandom = -1;
   static int fd_random = -1;
+  static int fd_configured = -1;
   static unsigned char ever_opened;
   int fd;
   int n;
@@ -134,6 +139,11 @@ _gcry_rndlinux_gather_random (void (*add
           close (fd_urandom);
           fd_urandom = -1;
         }
+      if (fd_configured != -1)
+        {
+          close (fd_configured);
+          fd_configured = -1;
+        }
       return 0;
     }
 
@@ -153,20 +163,30 @@ _gcry_rndlinux_gather_random (void (*add
      that we always require the device to be existent but want a more
      graceful behaviour if the rarely needed close operation has been
      used and the device needs to be re-opened later. */
+
+  if (level == -1)
+    {
+      if (fd_configured == -1)
+        fd_configured = open_device ( NAME_OF_CFG_RNGSEED, 0, 0 );
+      fd = fd_configured;
+      if (fd == -1)
+        return -1;
+    }
+
   if (level >= 2)
     {
       if (fd_random == -1)
         {
-          fd_random = open_device (NAME_OF_DEV_RANDOM, (ever_opened & 1));
+          fd_random = open_device (NAME_OF_DEV_RANDOM, (ever_opened & 1), 1);
           ever_opened |= 1;
         }
       fd = fd_random;
     }
-  else
+  else if (level != -1)
     {
       if (fd_urandom == -1)
         {
-          fd_urandom = open_device (NAME_OF_DEV_URANDOM, (ever_opened & 2));
+          fd_urandom = open_device (NAME_OF_DEV_URANDOM, (ever_opened & 2), 1);
           ever_opened |= 2;
         }
       fd = fd_urandom;