Merging upstream version 1.9.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

11 files changed, 1593 insertions, 0 deletions

diff --git a/ext/arc4random/Makefile.am b/ext/arc4random/Makefile.am
new file mode 100644
index 0000000..73479d1
--- /dev/null
+++ b/ext/arc4random/Makefile.am
@@ -0,0 +1,11 @@
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+	bsd-getentropy.c \
+	chacha_private.h \
+	explicit_bzero.c \
+	includes.h \
+	log.h
diff --git a/ext/arc4random/Makefile.in b/ext/arc4random/Makefile.in
new file mode 100644
index 0000000..e814995
--- /dev/null
+++ b/ext/arc4random/Makefile.in
@@ -0,0 +1,750 @@
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+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libarc4random.la: $(libarc4random_la_OBJECTS) $(libarc4random_la_DEPENDENCIES) $(EXTRA_libarc4random_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libarc4random_la_OBJECTS) $(libarc4random_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/arc4random.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/arc4random_uniform.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/bsd-getentropy.Plo@am__quote@ # am--include-marker
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+
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+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
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+
+.c.o:
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+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	shift; \
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+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+	$(am__define_uniq_tagged_files); \
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+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
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+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	mostlyclean-am
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+	-rm -f ./$(DEPDIR)/arc4random_uniform.Plo
+	-rm -f ./$(DEPDIR)/bsd-getentropy.Plo
+	-rm -f ./$(DEPDIR)/explicit_bzero.Plo
+	-rm -f Makefile
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+	-rm -f ./$(DEPDIR)/bsd-getentropy.Plo
+	-rm -f ./$(DEPDIR)/explicit_bzero.Plo
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+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/ext/arc4random/arc4random.c b/ext/arc4random/arc4random.c
new file mode 100644
index 0000000..56ebd81
--- /dev/null
+++ b/ext/arc4random/arc4random.c
@@ -0,0 +1,256 @@
+/*	$OpenBSD: arc4random.c,v 1.58 2022/07/31 13:41:45 tb Exp $	*/
+
+/*
+ * Copyright (c) 1996, David Mazieres <dm@uun.org>
+ * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
+ * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
+ * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
+ *
+ * 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.
+ */
+
+/*
+ * ChaCha based random number generator for OpenBSD.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/crypt/arc4random.c */
+
+#include "includes.h"
+
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <limits.h>
+#include <signal.h>
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+#ifndef HAVE_ARC4RANDOM
+
+/*
+ * Always use the getentropy implementation from bsd-getentropy.c, which
+ * will call a native getentropy if available then fall back as required.
+ * We use a different name so that OpenSSL cannot call the wrong getentropy.
+ */
+#ifdef getentropy
+# undef getentropy
+#endif
+#define getentropy(x, y) (_ssh_compat_getentropy((x), (y)))
+
+#include "log.h"
+
+#define KEYSTREAM_ONLY
+#include "chacha_private.h"
+
+#define minimum(a, b) ((a) < (b) ? (a) : (b))
+
+#if defined(__GNUC__) || defined(_MSC_VER)
+#define inline __inline
+#else				/* __GNUC__ || _MSC_VER */
+#define inline
+#endif				/* !__GNUC__ && !_MSC_VER */
+
+#define KEYSZ	32
+#define IVSZ	8
+#define BLOCKSZ	64
+#define RSBUFSZ	(16*BLOCKSZ)
+
+#define REKEY_BASE	(1024*1024) /* NB. should be a power of 2 */
+
+/* Marked MAP_INHERIT_ZERO, so zero'd out in fork children. */
+static struct _rs {
+	size_t		rs_have;	/* valid bytes at end of rs_buf */
+	size_t		rs_count;	/* bytes till reseed */
+} *rs;
+
+/* Maybe be preserved in fork children, if _rs_allocate() decides. */
+static struct _rsx {
+	chacha_ctx	rs_chacha;	/* chacha context for random keystream */
+	u_char		rs_buf[RSBUFSZ];	/* keystream blocks */
+} *rsx;
+
+static inline int _rs_allocate(struct _rs **, struct _rsx **);
+static inline void _rs_forkdetect(void);
+#include "arc4random.h"
+
+static inline void _rs_rekey(u_char *dat, size_t datlen);
+
+static inline void
+_rs_init(u_char *buf, size_t n)
+{
+	if (n < KEYSZ + IVSZ)
+		return;
+
+	if (rs == NULL) {
+		if (_rs_allocate(&rs, &rsx) == -1)
+			_exit(1);
+	}
+
+	chacha_keysetup(&rsx->rs_chacha, buf, KEYSZ * 8);
+	chacha_ivsetup(&rsx->rs_chacha, buf + KEYSZ);
+}
+
+static void
+_rs_stir(void)
+{
+	u_char rnd[KEYSZ + IVSZ];
+	uint32_t rekey_fuzz = 0;
+
+	if (getentropy(rnd, sizeof rnd) == -1)
+		_getentropy_fail();
+
+	if (!rs)
+		_rs_init(rnd, sizeof(rnd));
+	else
+		_rs_rekey(rnd, sizeof(rnd));
+	explicit_bzero(rnd, sizeof(rnd));	/* discard source seed */
+
+	/* invalidate rs_buf */
+	rs->rs_have = 0;
+	memset(rsx->rs_buf, 0, sizeof(rsx->rs_buf));
+
+	/* rekey interval should not be predictable */
+	chacha_encrypt_bytes(&rsx->rs_chacha, (uint8_t *)&rekey_fuzz,
+	    (uint8_t *)&rekey_fuzz, sizeof(rekey_fuzz));
+	rs->rs_count = REKEY_BASE + (rekey_fuzz % REKEY_BASE);
+}
+
+static inline void
+_rs_stir_if_needed(size_t len)
+{
+	_rs_forkdetect();
+	if (!rs || rs->rs_count <= len)
+		_rs_stir();
+	if (rs->rs_count <= len)
+		rs->rs_count = 0;
+	else
+		rs->rs_count -= len;
+}
+
+static inline void
+_rs_rekey(u_char *dat, size_t datlen)
+{
+#ifndef KEYSTREAM_ONLY
+	memset(rsx->rs_buf, 0, sizeof(rsx->rs_buf));
+#endif
+	/* fill rs_buf with the keystream */
+	chacha_encrypt_bytes(&rsx->rs_chacha, rsx->rs_buf,
+	    rsx->rs_buf, sizeof(rsx->rs_buf));
+	/* mix in optional user provided data */
+	if (dat) {
+		size_t i, m;
+
+		m = minimum(datlen, KEYSZ + IVSZ);
+		for (i = 0; i < m; i++)
+			rsx->rs_buf[i] ^= dat[i];
+	}
+	/* immediately reinit for backtracking resistance */
+	_rs_init(rsx->rs_buf, KEYSZ + IVSZ);
+	memset(rsx->rs_buf, 0, KEYSZ + IVSZ);
+	rs->rs_have = sizeof(rsx->rs_buf) - KEYSZ - IVSZ;
+}
+
+static inline void
+_rs_random_buf(void *_buf, size_t n)
+{
+	u_char *buf = (u_char *)_buf;
+	u_char *keystream;
+	size_t m;
+
+	_rs_stir_if_needed(n);
+	while (n > 0) {
+		if (rs->rs_have > 0) {
+			m = minimum(n, rs->rs_have);
+			keystream = rsx->rs_buf + sizeof(rsx->rs_buf)
+			    - rs->rs_have;
+			memcpy(buf, keystream, m);
+			memset(keystream, 0, m);
+			buf += m;
+			n -= m;
+			rs->rs_have -= m;
+		}
+		if (rs->rs_have == 0)
+			_rs_rekey(NULL, 0);
+	}
+}
+
+static inline void
+_rs_random_u32(uint32_t *val)
+{
+	u_char *keystream;
+
+	_rs_stir_if_needed(sizeof(*val));
+	if (rs->rs_have < sizeof(*val))
+		_rs_rekey(NULL, 0);
+	keystream = rsx->rs_buf + sizeof(rsx->rs_buf) - rs->rs_have;
+	memcpy(val, keystream, sizeof(*val));
+	memset(keystream, 0, sizeof(*val));
+	rs->rs_have -= sizeof(*val);
+}
+
+#include <pthread.h>
+static pthread_mutex_t arc4mutex = PTHREAD_MUTEX_INITIALIZER;
+
+uint32_t
+arc4random(void)
+{
+	uint32_t val;
+
+	_ARC4_LOCK();
+	_rs_random_u32(&val);
+	_ARC4_UNLOCK();
+	return val;
+}
+DEF_WEAK(arc4random);
+
+/*
+ * If we are providing arc4random, then we can provide a more efficient
+ * arc4random_buf().
+ */
+# ifndef HAVE_ARC4RANDOM_BUF
+void
+arc4random_buf(void *buf, size_t n)
+{
+	_ARC4_LOCK();
+	_rs_random_buf(buf, n);
+	_ARC4_UNLOCK();
+}
+DEF_WEAK(arc4random_buf);
+# endif /* !HAVE_ARC4RANDOM_BUF */
+#endif /* !HAVE_ARC4RANDOM */
+
+/* arc4random_buf() that uses platform arc4random() */
+#if !defined(HAVE_ARC4RANDOM_BUF) && defined(HAVE_ARC4RANDOM)
+void
+arc4random_buf(void *_buf, size_t n)
+{
+	size_t i;
+	u_int32_t r = 0;
+	char *buf = (char *)_buf;
+
+	for (i = 0; i < n; i++) {
+		if (i % 4 == 0)
+			r = arc4random();
+		buf[i] = r & 0xff;
+		r >>= 8;
+	}
+	explicit_bzero(&r, sizeof(r));
+}
+#endif /* !defined(HAVE_ARC4RANDOM_BUF) && defined(HAVE_ARC4RANDOM) */
+
diff --git a/ext/arc4random/arc4random.h b/ext/arc4random/arc4random.h
new file mode 100644
index 0000000..402b263
--- /dev/null
+++ b/ext/arc4random/arc4random.h
@@ -0,0 +1,89 @@
+/*	$OpenBSD: arc4random_linux.h,v 1.12 2019/07/11 10:37:28 inoguchi Exp $	*/
+
+/*
+ * Copyright (c) 1996, David Mazieres <dm@uun.org>
+ * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
+ * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
+ * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
+ *
+ * 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.
+ */
+
+/*
+ * Stub functions for portability.  From LibreSSL with some adaptations.
+ */
+
+#include <sys/mman.h>
+
+#include <signal.h>
+
+/* OpenSSH isn't multithreaded */
+#define _ARC4_LOCK() pthread_mutex_lock(&arc4mutex);
+#define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4mutex);
+#define _ARC4_ATFORK(f)
+
+static inline void
+_getentropy_fail(void)
+{
+	fatal("getentropy failed");
+}
+
+static volatile sig_atomic_t _rs_forked;
+
+static inline void
+_rs_forkhandler(void)
+{
+	_rs_forked = 1;
+}
+
+static inline void
+_rs_forkdetect(void)
+{
+	static pid_t _rs_pid = 0;
+	pid_t pid = getpid();
+
+	if (_rs_pid == 0 || _rs_pid == 1 || _rs_pid != pid || _rs_forked) {
+		_rs_pid = pid;
+		_rs_forked = 0;
+		if (rs)
+			memset(rs, 0, sizeof(*rs));
+	}
+}
+
+static inline int
+_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
+{
+#if defined(MAP_ANON) && defined(MAP_PRIVATE)
+	if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE,
+	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
+		return (-1);
+
+	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
+	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
+		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
+		return (-1);
+	}
+#else
+	if ((*rsp = calloc(1, sizeof(**rsp))) == NULL)
+		return (-1);
+	if ((*rsxp = calloc(1, sizeof(**rsxp))) == NULL) {
+		free(*rsp);
+		*rsp = NULL;
+		return (-1);
+	}
+#endif
+
+	_ARC4_ATFORK(_rs_forkhandler);
+	return (0);
+}
diff --git a/ext/arc4random/arc4random.hh b/ext/arc4random/arc4random.hh
new file mode 100644
index 0000000..6e01712
--- /dev/null
+++ b/ext/arc4random/arc4random.hh
@@ -0,0 +1,21 @@
+#pragma once
+#include <cstddef>
+#include <cinttypes>
+
+#include "config.h"
+
+extern "C"
+{
+#ifndef HAVE_ARC4RANDOM
+  uint32_t arc4random(void);
+#endif
+#ifndef HAVE_ARC4RANDOM_BUF
+  void arc4random_buf(void* buf, size_t nbytes);
+#endif
+#ifndef HAVE_ARC4RANDOM_UNIFORM
+  uint32_t arc4random_uniform(uint32_t upper_bound);
+#endif
+#ifndef HAVE_EXPLICIT_BZERO
+  void explicit_bzero(void*, size_t len);
+#endif
+}
diff --git a/ext/arc4random/arc4random_uniform.c b/ext/arc4random/arc4random_uniform.c
new file mode 100644
index 0000000..591f92d
--- /dev/null
+++ b/ext/arc4random/arc4random_uniform.c
@@ -0,0 +1,64 @@
+/*	$OpenBSD: arc4random_uniform.c,v 1.3 2019/01/20 02:59:07 bcook Exp $	*/
+
+/*
+ * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
+ *
+ * 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.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/crypto/arc4random_uniform.c */
+
+#include "includes.h"
+
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#include <stdlib.h>
+
+#ifndef HAVE_ARC4RANDOM_UNIFORM
+/*
+ * Calculate a uniformly distributed random number less than upper_bound
+ * avoiding "modulo bias".
+ *
+ * Uniformity is achieved by generating new random numbers until the one
+ * returned is outside the range [0, 2**32 % upper_bound).  This
+ * guarantees the selected random number will be inside
+ * [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound)
+ * after reduction modulo upper_bound.
+ */
+uint32_t
+arc4random_uniform(uint32_t upper_bound)
+{
+	uint32_t r, min;
+
+	if (upper_bound < 2)
+		return 0;
+
+	/* 2**32 % x == (2**32 - x) % x */
+	min = -upper_bound % upper_bound;
+
+	/*
+	 * This could theoretically loop forever but each retry has
+	 * p > 0.5 (worst case, usually far better) of selecting a
+	 * number inside the range we need, so it should rarely need
+	 * to re-roll.
+	 */
+	for (;;) {
+		r = arc4random();
+		if (r >= min)
+			break;
+	}
+
+	return r % upper_bound;
+}
+#endif /* !HAVE_ARC4RANDOM_UNIFORM */
diff --git a/ext/arc4random/bsd-getentropy.c b/ext/arc4random/bsd-getentropy.c
new file mode 100644
index 0000000..0231e06
--- /dev/null
+++ b/ext/arc4random/bsd-getentropy.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 1996, David Mazieres <dm@uun.org>
+ * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
+ * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
+ *
+ * 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.
+ */
+
+#include "includes.h"
+
+#ifndef SSH_RANDOM_DEV
+# define SSH_RANDOM_DEV "/dev/urandom"
+#endif /* SSH_RANDOM_DEV */
+
+#include <sys/types.h>
+#ifdef HAVE_SYS_RANDOM_H
+# include <sys/random.h>
+#endif
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#ifdef WITH_OPENSSL
+#include <openssl/rand.h>
+#include <openssl/err.h>
+#endif
+
+#include "log.h"
+
+int
+_ssh_compat_getentropy(void *s, size_t len)
+{
+#ifdef WITH_OPENSSL
+	if (RAND_bytes(s, len) <= 0)
+		fatal("Couldn't obtain random bytes (error 0x%lx)",
+		    (unsigned long)ERR_get_error());
+#else
+	int fd, save_errno;
+	ssize_t r;
+	size_t o = 0;
+
+#ifdef HAVE_GETENTROPY
+	if ((r = getentropy(s, len)) == 0)
+		return 0;
+#endif /* HAVE_GETENTROPY */
+#ifdef HAVE_GETRANDOM
+	if ((r = getrandom(s, len, 0)) > 0 && (size_t)r == len)
+		return 0;
+#endif /* HAVE_GETRANDOM */
+
+	if ((fd = open(SSH_RANDOM_DEV, O_RDONLY)) == -1) {
+		save_errno = errno;
+		/* Try egd/prngd before giving up. */
+		if (seed_from_prngd(s, len) == 0)
+			return 0;
+		fatal("Couldn't open %s: %s", SSH_RANDOM_DEV,
+		    strerror(save_errno));
+	}
+	while (o < len) {
+		r = read(fd, (u_char *)s + o, len - o);
+		if (r < 0) {
+			if (errno == EAGAIN || errno == EINTR ||
+			    errno == EWOULDBLOCK)
+				continue;
+			fatal("read %s: %s", SSH_RANDOM_DEV, strerror(errno));
+		}
+		o += r;
+	}
+	close(fd);
+#endif /* WITH_OPENSSL */
+	return 0;
+}
diff --git a/ext/arc4random/chacha_private.h b/ext/arc4random/chacha_private.h
new file mode 100644
index 0000000..cdcb785
--- /dev/null
+++ b/ext/arc4random/chacha_private.h
@@ -0,0 +1,224 @@
+/* OPENBSD ORIGINAL: lib/libc/crypt/chacha_private.h */
+
+/*
+chacha-merged.c version 20080118
+D. J. Bernstein
+Public domain.
+*/
+
+/* $OpenBSD: chacha_private.h,v 1.3 2022/02/28 21:56:29 dtucker Exp $ */
+
+typedef unsigned char u8;
+typedef unsigned int u32;
+
+typedef struct
+{
+  u32 input[16]; /* could be compressed */
+} chacha_ctx;
+
+#define U8C(v) (v##U)
+#define U32C(v) (v##U)
+
+#define U8V(v) ((u8)(v) & U8C(0xFF))
+#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF))
+
+#define ROTL32(v, n) \
+  (U32V((v) << (n)) | ((v) >> (32 - (n))))
+
+#define U8TO32_LITTLE(p) \
+  (((u32)((p)[0])      ) | \
+   ((u32)((p)[1]) <<  8) | \
+   ((u32)((p)[2]) << 16) | \
+   ((u32)((p)[3]) << 24))
+
+#define U32TO8_LITTLE(p, v) \
+  do { \
+    (p)[0] = U8V((v)      ); \
+    (p)[1] = U8V((v) >>  8); \
+    (p)[2] = U8V((v) >> 16); \
+    (p)[3] = U8V((v) >> 24); \
+  } while (0)
+
+#define ROTATE(v,c) (ROTL32(v,c))
+#define XOR(v,w) ((v) ^ (w))
+#define PLUS(v,w) (U32V((v) + (w)))
+#define PLUSONE(v) (PLUS((v),1))
+
+#define QUARTERROUND(a,b,c,d) \
+  a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \
+  c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \
+  a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
+  c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
+
+static const char sigma[16] = "expand 32-byte k";
+static const char tau[16] = "expand 16-byte k";
+
+static void
+chacha_keysetup(chacha_ctx *x,const u8 *k,u32 kbits)
+{
+  const char *constants;
+
+  x->input[4] = U8TO32_LITTLE(k + 0);
+  x->input[5] = U8TO32_LITTLE(k + 4);
+  x->input[6] = U8TO32_LITTLE(k + 8);
+  x->input[7] = U8TO32_LITTLE(k + 12);
+  if (kbits == 256) { /* recommended */
+    k += 16;
+    constants = sigma;
+  } else { /* kbits == 128 */
+    constants = tau;
+  }
+  x->input[8] = U8TO32_LITTLE(k + 0);
+  x->input[9] = U8TO32_LITTLE(k + 4);
+  x->input[10] = U8TO32_LITTLE(k + 8);
+  x->input[11] = U8TO32_LITTLE(k + 12);
+  x->input[0] = U8TO32_LITTLE(constants + 0);
+  x->input[1] = U8TO32_LITTLE(constants + 4);
+  x->input[2] = U8TO32_LITTLE(constants + 8);
+  x->input[3] = U8TO32_LITTLE(constants + 12);
+}
+
+static void
+chacha_ivsetup(chacha_ctx *x,const u8 *iv)
+{
+  x->input[12] = 0;
+  x->input[13] = 0;
+  x->input[14] = U8TO32_LITTLE(iv + 0);
+  x->input[15] = U8TO32_LITTLE(iv + 4);
+}
+
+static void
+chacha_encrypt_bytes(chacha_ctx *x,const u8 *m,u8 *c,u32 bytes)
+{
+  u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
+  u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
+  u8 *ctarget = NULL;
+  u8 tmp[64];
+  u_int i;
+
+  if (!bytes) return;
+
+  j0 = x->input[0];
+  j1 = x->input[1];
+  j2 = x->input[2];
+  j3 = x->input[3];
+  j4 = x->input[4];
+  j5 = x->input[5];
+  j6 = x->input[6];
+  j7 = x->input[7];
+  j8 = x->input[8];
+  j9 = x->input[9];
+  j10 = x->input[10];
+  j11 = x->input[11];
+  j12 = x->input[12];
+  j13 = x->input[13];
+  j14 = x->input[14];
+  j15 = x->input[15];
+
+  for (;;) {
+    if (bytes < 64) {
+      for (i = 0;i < bytes;++i) tmp[i] = m[i];
+      m = tmp;
+      ctarget = c;
+      c = tmp;
+    }
+    x0 = j0;
+    x1 = j1;
+    x2 = j2;
+    x3 = j3;
+    x4 = j4;
+    x5 = j5;
+    x6 = j6;
+    x7 = j7;
+    x8 = j8;
+    x9 = j9;
+    x10 = j10;
+    x11 = j11;
+    x12 = j12;
+    x13 = j13;
+    x14 = j14;
+    x15 = j15;
+    for (i = 20;i > 0;i -= 2) {
+      QUARTERROUND( x0, x4, x8,x12)
+      QUARTERROUND( x1, x5, x9,x13)
+      QUARTERROUND( x2, x6,x10,x14)
+      QUARTERROUND( x3, x7,x11,x15)
+      QUARTERROUND( x0, x5,x10,x15)
+      QUARTERROUND( x1, x6,x11,x12)
+      QUARTERROUND( x2, x7, x8,x13)
+      QUARTERROUND( x3, x4, x9,x14)
+    }
+    x0 = PLUS(x0,j0);
+    x1 = PLUS(x1,j1);
+    x2 = PLUS(x2,j2);
+    x3 = PLUS(x3,j3);
+    x4 = PLUS(x4,j4);
+    x5 = PLUS(x5,j5);
+    x6 = PLUS(x6,j6);
+    x7 = PLUS(x7,j7);
+    x8 = PLUS(x8,j8);
+    x9 = PLUS(x9,j9);
+    x10 = PLUS(x10,j10);
+    x11 = PLUS(x11,j11);
+    x12 = PLUS(x12,j12);
+    x13 = PLUS(x13,j13);
+    x14 = PLUS(x14,j14);
+    x15 = PLUS(x15,j15);
+
+#ifndef KEYSTREAM_ONLY
+    x0 = XOR(x0,U8TO32_LITTLE(m + 0));
+    x1 = XOR(x1,U8TO32_LITTLE(m + 4));
+    x2 = XOR(x2,U8TO32_LITTLE(m + 8));
+    x3 = XOR(x3,U8TO32_LITTLE(m + 12));
+    x4 = XOR(x4,U8TO32_LITTLE(m + 16));
+    x5 = XOR(x5,U8TO32_LITTLE(m + 20));
+    x6 = XOR(x6,U8TO32_LITTLE(m + 24));
+    x7 = XOR(x7,U8TO32_LITTLE(m + 28));
+    x8 = XOR(x8,U8TO32_LITTLE(m + 32));
+    x9 = XOR(x9,U8TO32_LITTLE(m + 36));
+    x10 = XOR(x10,U8TO32_LITTLE(m + 40));
+    x11 = XOR(x11,U8TO32_LITTLE(m + 44));
+    x12 = XOR(x12,U8TO32_LITTLE(m + 48));
+    x13 = XOR(x13,U8TO32_LITTLE(m + 52));
+    x14 = XOR(x14,U8TO32_LITTLE(m + 56));
+    x15 = XOR(x15,U8TO32_LITTLE(m + 60));
+#endif
+
+    j12 = PLUSONE(j12);
+    if (!j12) {
+      j13 = PLUSONE(j13);
+      /* stopping at 2^70 bytes per nonce is user's responsibility */
+    }
+
+    U32TO8_LITTLE(c + 0,x0);
+    U32TO8_LITTLE(c + 4,x1);
+    U32TO8_LITTLE(c + 8,x2);
+    U32TO8_LITTLE(c + 12,x3);
+    U32TO8_LITTLE(c + 16,x4);
+    U32TO8_LITTLE(c + 20,x5);
+    U32TO8_LITTLE(c + 24,x6);
+    U32TO8_LITTLE(c + 28,x7);
+    U32TO8_LITTLE(c + 32,x8);
+    U32TO8_LITTLE(c + 36,x9);
+    U32TO8_LITTLE(c + 40,x10);
+    U32TO8_LITTLE(c + 44,x11);
+    U32TO8_LITTLE(c + 48,x12);
+    U32TO8_LITTLE(c + 52,x13);
+    U32TO8_LITTLE(c + 56,x14);
+    U32TO8_LITTLE(c + 60,x15);
+
+    if (bytes <= 64) {
+      if (bytes < 64) {
+        for (i = 0;i < bytes;++i) ctarget[i] = c[i];
+      }
+      x->input[12] = j12;
+      x->input[13] = j13;
+      return;
+    }
+    bytes -= 64;
+    c += 64;
+#ifndef KEYSTREAM_ONLY
+    m += 64;
+#endif
+  }
+}
diff --git a/ext/arc4random/explicit_bzero.c b/ext/arc4random/explicit_bzero.c
new file mode 100644
index 0000000..68cd2c1
--- /dev/null
+++ b/ext/arc4random/explicit_bzero.c
@@ -0,0 +1,65 @@
+/* OPENBSD ORIGINAL: lib/libc/string/explicit_bzero.c */
+/*	$OpenBSD: explicit_bzero.c,v 1.1 2014/01/22 21:06:45 tedu Exp $ */
+/*
+ * Public domain.
+ * Written by Ted Unangst
+ */
+
+#include "includes.h"
+
+#include <string.h>
+
+/*
+ * explicit_bzero - don't let the compiler optimize away bzero
+ */
+
+#ifndef HAVE_EXPLICIT_BZERO
+
+#ifdef HAVE_EXPLICIT_MEMSET
+
+void
+explicit_bzero(void *p, size_t n)
+{
+	(void)explicit_memset(p, 0, n);
+}
+
+#elif defined(HAVE_MEMSET_S)
+
+void
+explicit_bzero(void *p, size_t n)
+{
+	if (n == 0)
+		return;
+	(void)memset_s(p, n, 0, n);
+}
+
+#else /* HAVE_MEMSET_S */
+
+/*
+ * Indirect bzero through a volatile pointer to hopefully avoid
+ * dead-store optimisation eliminating the call.
+ */
+static void (* volatile ssh_bzero)(void *, size_t) = bzero;
+
+void
+explicit_bzero(void *p, size_t n)
+{
+	if (n == 0)
+		return;
+	/*
+	 * clang -fsanitize=memory needs to intercept memset-like functions
+	 * to correctly detect memory initialisation. Make sure one is called
+	 * directly since our indirection trick above successfully confuses it.
+	 */
+#if defined(__has_feature)
+# if __has_feature(memory_sanitizer)
+	memset(p, 0, n);
+# endif
+#endif
+
+	ssh_bzero(p, n);
+}
+
+#endif /* HAVE_MEMSET_S */
+
+#endif /* HAVE_EXPLICIT_BZERO */
diff --git a/ext/arc4random/includes.h b/ext/arc4random/includes.h
new file mode 100644
index 0000000..f5bedfa
--- /dev/null
+++ b/ext/arc4random/includes.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "config.h"
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#define seed_from_prngd(a, b) -1
+
+#ifndef HAVE_ARC4RANDOM
+uint32_t arc4random(void);
+#endif
+#ifndef HAVE_ARC4RANDOM_BUF
+void arc4random_buf(void *buf, size_t nbytes);
+#endif
+#ifndef HAVE_ARC4RANDOM_UNIFORM
+uint32_t arc4random_uniform(uint32_t upper_bound);
+#endif
+#ifndef HAVE_EXPLICIT_BZERO
+void explicit_bzero(void *, size_t len);
+#endif
+
+int _ssh_compat_getentropy(void *, size_t);
+
+#define DEF_WEAK(x)
diff --git a/ext/arc4random/log.h b/ext/arc4random/log.h
new file mode 100644
index 0000000..51d7af2
--- /dev/null
+++ b/ext/arc4random/log.h
@@ -0,0 +1 @@
+#define fatal(...) do { fprintf(stderr, __VA_ARGS__); abort(); } while (0)