diff --git a/entropy.c b/entropy.c

index 2d483b3..b361a04 100644

--- a/entropy.c

+++ b/entropy.c

@@ -234,6 +234,9 @@ seed_rng(void)

 	}

 #endif /* OPENSSL_PRNG_ONLY */

+#ifdef __linux__

+	linux_seed();

+#endif /* __linux__ */

 	if (RAND_status() != 1)

 		fatal("PRNG is not seeded");

diff --git a/openbsd-compat/Makefile.in b/openbsd-compat/Makefile.in

index b912dbe..9206337 100644

--- a/openbsd-compat/Makefile.in

+++ b/openbsd-compat/Makefile.in

@@ -20,6 +20,7 @@ OPENBSD=base64.o basename.o bcrypt_pbkdf.o bindresvport.o blowfish.o daemon.o di

 	port-solaris.o \

 	port-net.o \

 	port-uw.o \

+	port-linux-prng.o \

 	port-linux-sshd.o

 .c.o:

diff -up openssh-7.4p1/openbsd-compat/port-linux.h.entropy openssh-7.4p1/openbsd-compat/port-linux.h

--- openssh-7.4p1/openbsd-compat/port-linux.h.entropy	2016-12-23 18:34:27.747753563 +0100

+++ openssh-7.4p1/openbsd-compat/port-linux.h	2016-12-23 18:34:27.769753570 +0100

@@ -34,4 +34,6 @@ void oom_adjust_restore(void);

 void oom_adjust_setup(void);

 #endif

+void linux_seed(void);

+

 #endif /* ! _PORT_LINUX_H */

diff --git a/openbsd-compat/port-linux-prng.c b/openbsd-compat/port-linux-prng.c

new file mode 100644

index 0000000..92a617c

--- /dev/null

+++ b/openbsd-compat/port-linux-prng.c

@@ -0,0 +1,70 @@

+/*

+ * Copyright (c) 2011 - 2020 Red Hat, Inc.

+ *

+ * Authors:

+ *  Jan F. Chadima <jchadima@redhat.com>

+ *  Jakub Jelen <jjelen@redhat.com>

+ *

+ * Permission to use, copy, modify, and distribute this software for any

+ * purpose with or without fee is hereby granted, provided that the above

+ * copyright notice and this permission notice appear in all copies.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

+ */

+

+/*

+ * Linux-specific portability code - prng support

+ */

+

+#include "includes.h"

+

+#include <errno.h>

+#include <string.h>

+#include <openssl/rand.h>

+#include <sys/random.h>

+

+#include "log.h"

+

+void

+linux_seed(void)

+{

+	char *env = NULL;

+	size_t randlen = 14, left;

+	unsigned int flags = 0;

+	unsigned char buf[256], *p;

+

+	env = getenv("SSH_USE_STRONG_RNG");

+	if (env && strcmp(env, "0") != 0) {

+		size_t ienv = atoi(env);

+

+		/* Max on buffer length */

+		if (ienv > sizeof(buf))

+			ienv = sizeof(buf);

+		/* Minimum is always 14 B */

+		if (ienv > randlen)

+			randlen = ienv;

+		flags = GRND_RANDOM;

+	}

+

+	errno = 0;

+	left = randlen;

+	p = buf;

+	do {

+		ssize_t len = getrandom(p, left, flags);

+		if (len == -1) {

+			if (errno != EINTR)

+				fatal("Failed to seed from getrandom: %s", strerror(errno));

+		} else if (len > 0) {

+			left -= len;

+			p += len;

+		}

+	} while (left > 0);

+

+	RAND_seed(buf, randlen);

+}

diff --git a/ssh-add.1 b/ssh-add.1

index 4812448..16305bf 100644

--- a/ssh-add.1

+++ b/ssh-add.1

@@ -161,6 +161,20 @@ to make this work.)

 Identifies the path of a

 .Ux Ns -domain

 socket used to communicate with the agent.

+.It Ev SSH_USE_STRONG_RNG

+The reseeding of the OpenSSL random generator is usually done from

+.Cm /dev/urandom .

+If the

+.Cm SSH_USE_STRONG_RNG

+environment variable is set to value other than

+.Cm 0

+the OpenSSL random generator is reseeded from

+.Cm /dev/random .

+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.

+Minimum is 14 bytes.

+This setting is not recommended on the computers without the hardware

+random generator because insufficient entropy causes the connection to

+be blocked until enough entropy is available.

 .El

 .Sh FILES

 .Bl -tag -width Ds

diff --git a/ssh-agent.1 b/ssh-agent.1

index 281ecbd..1a9a635 100644

--- a/ssh-agent.1

+++ b/ssh-agent.1

@@ -201,6 +201,24 @@ sockets used to contain the connection to the authentication agent.

 These sockets should only be readable by the owner.

 The sockets should get automatically removed when the agent exits.

 .El

+.Sh ENVIRONMENT

+.Bl -tag -width Ds -compact

+.Pp

+.It Pa SSH_USE_STRONG_RNG

+The reseeding of the OpenSSL random generator is usually done from

+.Cm /dev/urandom .

+If the

+.Cm SSH_USE_STRONG_RNG

+environment variable is set to value other than

+.Cm 0

+the OpenSSL random generator is reseeded from

+.Cm /dev/random .

+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.

+Minimum is 14 bytes.

+This setting is not recommended on the computers without the hardware

+random generator because insufficient entropy causes the connection to

+be blocked until enough entropy is available.

+.El

 .Sh SEE ALSO

 .Xr ssh 1 ,

 .Xr ssh-add 1 ,

diff --git a/ssh-keygen.1 b/ssh-keygen.1

index 12e00d4..1b51a4a 100644

--- a/ssh-keygen.1

+++ b/ssh-keygen.1

@@ -832,6 +832,24 @@ Contains Diffie-Hellman groups used for DH-GEX.

 The file format is described in

 .Xr moduli 5 .

 .El

+.Sh ENVIRONMENT

+.Bl -tag -width Ds -compact

+.Pp

+.It Pa SSH_USE_STRONG_RNG

+The reseeding of the OpenSSL random generator is usually done from

+.Cm /dev/urandom .

+If the

+.Cm SSH_USE_STRONG_RNG

+environment variable is set to value other than

+.Cm 0

+the OpenSSL random generator is reseeded from

+.Cm /dev/random .

+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.

+Minimum is 14 bytes.

+This setting is not recommended on the computers without the hardware

+random generator because insufficient entropy causes the connection to

+be blocked until enough entropy is available.

+.El

 .Sh SEE ALSO

 .Xr ssh 1 ,

 .Xr ssh-add 1 ,

diff --git a/ssh-keysign.8 b/ssh-keysign.8

index 69d0829..02d79f8 100644

--- a/ssh-keysign.8

+++ b/ssh-keysign.8

@@ -80,6 +80,24 @@ must be set-uid root if host-based authentication is used.

 If these files exist they are assumed to contain public certificate

 information corresponding with the private keys above.

 .El

+.Sh ENVIRONMENT

+.Bl -tag -width Ds -compact

+.Pp

+.It Pa SSH_USE_STRONG_RNG

+The reseeding of the OpenSSL random generator is usually done from

+.Cm /dev/urandom .

+If the

+.Cm SSH_USE_STRONG_RNG

+environment variable is set to value other than

+.Cm 0

+the OpenSSL random generator is reseeded from

+.Cm /dev/random .

+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.

+Minimum is 14 bytes.

+This setting is not recommended on the computers without the hardware

+random generator because insufficient entropy causes the connection to

+be blocked until enough entropy is available.

+.El

 .Sh SEE ALSO

 .Xr ssh 1 ,

 .Xr ssh-keygen 1 ,

diff --git a/ssh.1 b/ssh.1

index 929904b..f65e42f 100644

--- a/ssh.1

+++ b/ssh.1

@@ -1309,6 +1309,23 @@ For more information, see the

 .Cm PermitUserEnvironment

 option in

 .Xr sshd_config 5 .

+.Sh ENVIRONMENT

+.Bl -tag -width Ds -compact

+.It Ev SSH_USE_STRONG_RNG

+The reseeding of the OpenSSL random generator is usually done from

+.Cm /dev/urandom .

+If the

+.Cm SSH_USE_STRONG_RNG

+environment variable is set to value other than

+.Cm 0

+the OpenSSL random generator is reseeded from

+.Cm /dev/random .

+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.

+Minimum is 14 bytes.

+This setting is not recommended on the computers without the hardware

+random generator because insufficient entropy causes the connection to

+be blocked until enough entropy is available.

+.El

 .Sh FILES

 .Bl -tag -width Ds -compact

 .It Pa ~/.rhosts

diff --git a/sshd.8 b/sshd.8

index c2c237f..058d37a 100644

--- a/sshd.8

+++ b/sshd.8

@@ -951,6 +951,24 @@ concurrently for different ports, this contains the process ID of the one

 started last).

 The content of this file is not sensitive; it can be world-readable.

 .El

+.Sh ENVIRONMENT

+.Bl -tag -width Ds -compact

+.Pp

+.It Pa SSH_USE_STRONG_RNG

+The reseeding of the OpenSSL random generator is usually done from

+.Cm /dev/urandom .

+If the

+.Cm SSH_USE_STRONG_RNG

+environment variable is set to value other than

+.Cm 0

+the OpenSSL random generator is reseeded from

+.Cm /dev/random .

+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.

+Minimum is 14 bytes.

+This setting is not recommended on the computers without the hardware

+random generator because insufficient entropy causes the connection to

+be blocked until enough entropy is available.

+.El

 .Sh IPV6

 IPv6 address can be used everywhere where IPv4 address. In all entries must be the IPv6 address enclosed in square brackets. Note: The square brackets are metacharacters for the shell and must be escaped in shell.

 .Sh SEE ALSO