Latest update.

include/crypto/rand.h

@@ -23,6 +23,55 @@
 /* forward declaration */
 typedef struct rand_pool_st RAND_POOL;
 
+/*
+ * Defines related to seed sources
+ */
+#ifndef DEVRANDOM
+/*
+ * set this to a comma-separated list of 'random' device files to try out. By
+ * default, we will try to read at least one of these files
+ */
+# define DEVRANDOM "/dev/urandom", "/dev/random", "/dev/hwrng", "/dev/srandom"
+# if defined(__linux) && !defined(__ANDROID__)
+#  ifndef DEVRANDOM_WAIT
+#   define DEVRANDOM_WAIT   "/dev/random"
+#  endif
+/*
+ * Linux kernels 4.8 and later changes how their random device works and there
+ * is no reliable way to tell that /dev/urandom has been seeded -- getentropy(2)
+ * should be used instead.
+ */
+#  ifndef DEVRANDOM_SAFE_KERNEL
+#   define DEVRANDOM_SAFE_KERNEL        4, 8
+#  endif
+/*
+ * Some operating systems do not permit select(2) on their random devices,
+ * defining this to zero will force the use of read(2) to extract one byte
+ * from /dev/random.
+ */
+#  ifndef DEVRANDM_WAIT_USE_SELECT
+#   define DEVRANDM_WAIT_USE_SELECT     1
+#  endif
+/*
+ * Define the shared memory identifier used to indicate if the operating
+ * system has properly seeded the DEVRANDOM source.
+ */
+#  ifndef OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID
+#   define OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID 114
+#  endif
+
+# endif
+#endif
+
+#if !defined(OPENSSL_NO_EGD) && !defined(DEVRANDOM_EGD)
+/*
+ * set this to a comma-separated list of 'egd' sockets to try out. These
+ * sockets will be tried in the order listed in case accessing the device
+ * files listed in DEVRANDOM did not return enough randomness.
+ */
+# define DEVRANDOM_EGD "/var/run/egd-pool", "/dev/egd-pool", "/etc/egd-pool", "/etc/entropy"
+#endif
+
 void rand_cleanup_int(void);
 
 /* Hardware-based seeding functions. */