+#ifdef OPENSSL_SYS_VMS
+/*
+ * Misc hacks needed for specific cases.
+ *
+ * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically)
+ * to make sure the FILE* is a 32-bit pointer no matter what. We know that
+ * stdio function return this type (a study of stdio.h proves it).
+ * Additionally, we create a similar char pointer type for the sake of
+ * vms_setbuf below.
+ */
+# if __INITIAL_POINTER_SIZE == 64
+# pragma pointer_size save
+# pragma pointer_size 32
+# endif
+typedef char *char_ptr32;
+# if __INITIAL_POINTER_SIZE == 64
+# pragma pointer_size restore
+# endif
+
+/*
+ * On VMS, setbuf() will only take 32-bit pointers, and a compilation
+ * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
+ * Since we know that the FILE* really is a 32-bit pointer expanded to
+ * 64 bits, we also know it's safe to convert it back to a 32-bit pointer.
+ * As for the buffer parameter, we only use NULL here, so that passes as
+ * well...
+ */
+static void vms_setbuf(FILE *fp, char *buf)
+{
+ setbuf((__FILE_ptr32)fp, (char_ptr32)buf);
+}
+/*
+ * This declaration is a nasty hack to get around vms' extension to fopen for
+ * passing in sharing options being disabled by /STANDARD=ANSI89
+ */
+static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) =
+ (__FILE_ptr32 (*)(const char *, const char *, ...))fopen;
+# define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
+
+# define fopen(fname,mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS)
+# define setbuf(fp,buf) vms_setbuf((fp), (buf))
+#endif
+
+#define RFILE ".rnd"
+
+/*
+ * Note that these functions are intended for seed files only. Entropy
+ * devices and EGD sockets are handled in rand_unix.c
+ */
+
+int RAND_load_file(const char *file, long bytes)
+{
+ /*-
+ * If bytes >= 0, read up to 'bytes' bytes.
+ * if bytes == -1, read complete file.
+ */
+
+ unsigned char buf[BUFSIZE];
+#ifndef OPENSSL_NO_POSIX_IO
+ struct stat sb;
+#endif
+ int i, ret = 0, n;
+ FILE *in;
+
+ if (file == NULL)
+ return (0);
+
+#ifndef OPENSSL_NO_POSIX_IO
+ /*
+ * struct stat can have padding and unused fields that may not be
+ * initialized in the call to stat(). We need to clear the entire
+ * structure before calling RAND_add() to avoid complaints from
+ * applications such as Valgrind.
+ */
+ memset(&sb, 0, sizeof(sb));
+ if (stat(file, &sb) < 0)
+ return (0);
+ RAND_add(&sb, sizeof(sb), 0.0);
+#endif
+ if (bytes == 0)
+ return (ret);
+
+ in = fopen(file, "rb");
+ if (in == NULL)
+ goto err;
+#if defined(S_ISBLK) && defined(S_ISCHR) && !defined(OPENSSL_NO_POSIX_IO)
+ if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
+ /*
+ * this file is a device. we don't want read an infinite number of
+ * bytes from a random device, nor do we want to use buffered I/O
+ * because we will waste system entropy.
+ */
+ bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
+ setbuf(in, NULL); /* don't do buffered reads */
+ }
+#endif
+ for (;;) {
+ if (bytes > 0)
+ n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
+ else
+ n = BUFSIZE;
+ i = fread(buf, 1, n, in);
+ if (i <= 0)
+ break;
+
+ RAND_add(buf, i, (double)i);
+ ret += i;
+ if (bytes > 0) {
+ bytes -= n;
+ if (bytes <= 0)
+ break;
+ }
+ }
+ fclose(in);
+ OPENSSL_cleanse(buf, BUFSIZE);
+ err:
+ return (ret);
+}
+
+int RAND_write_file(const char *file)
+{
+ unsigned char buf[BUFSIZE];
+ int i, ret = 0, rand_err = 0;
+ FILE *out = NULL;
+ int n;
+#ifndef OPENSSL_NO_POSIX_IO
+ struct stat sb;
+
+ i = stat(file, &sb);
+ if (i != -1) {
+# if defined(S_ISBLK) && defined(S_ISCHR)
+ if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
+ /*
+ * this file is a device. we don't write back to it. we
+ * "succeed" on the assumption this is some sort of random
+ * device. Otherwise attempting to write to and chmod the device
+ * causes problems.
+ */
+ return (1);
+ }
+# endif
+ }
+#endif
+
+#if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS)
+ {
+# ifndef O_BINARY
+# define O_BINARY 0
+# endif
+ /*
+ * chmod(..., 0600) is too late to protect the file, permissions
+ * should be restrictive from the start
+ */
+ int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
+ if (fd != -1)
+ out = fdopen(fd, "wb");
+ }
+#endif
+
+#ifdef OPENSSL_SYS_VMS
+ /*
+ * VMS NOTE: Prior versions of this routine created a _new_ version of
+ * the rand file for each call into this routine, then deleted all
+ * existing versions named ;-1, and finally renamed the current version
+ * as ';1'. Under concurrent usage, this resulted in an RMS race
+ * condition in rename() which could orphan files (see vms message help
+ * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
+ * the top-level version of the rand file. Note that there may still be
+ * conditions where the top-level rand file is locked. If so, this code
+ * will then create a new version of the rand file. Without the delete
+ * and rename code, this can result in ascending file versions that stop
+ * at version 32767, and this routine will then return an error. The
+ * remedy for this is to recode the calling application to avoid
+ * concurrent use of the rand file, or synchronize usage at the
+ * application level. Also consider whether or not you NEED a persistent
+ * rand file in a concurrent use situation.
+ */
+
+ out = fopen(file, "rb+");
+#endif
+ if (out == NULL)
+ out = fopen(file, "wb");
+ if (out == NULL)
+ goto err;
+
+#if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
+ chmod(file, 0600);
+#endif
+ n = RAND_DATA;
+ for (;;) {
+ i = (n > BUFSIZE) ? BUFSIZE : n;
+ n -= BUFSIZE;
+ if (RAND_bytes(buf, i) <= 0)
+ rand_err = 1;
+ i = fwrite(buf, 1, i, out);
+ if (i <= 0) {
+ ret = 0;
+ break;
+ }
+ ret += i;
+ if (n <= 0)
+ break;
+ }
+
+ fclose(out);
+ OPENSSL_cleanse(buf, BUFSIZE);
+ err:
+ return (rand_err ? -1 : ret);
+}
+
+const char *RAND_file_name(char *buf, size_t size)
+{
+ char *s = NULL;
+#ifdef __OpenBSD__
+ struct stat sb;
+#endif
+
+ if (OPENSSL_issetugid() == 0)
+ s = getenv("RANDFILE");
+ if (s != NULL && *s && strlen(s) + 1 < size) {
+ if (OPENSSL_strlcpy(buf, s, size) >= size)
+ return NULL;
+ } else {
+#ifdef OPENSSL_SYS_WINDOWS
+ if ((s = getenv("HOME")) == NULL
+ && (s = getenv("USERPROFILE")) == NULL) {
+ s = getenv("SYSTEMROOT");
+ }
+#else
+ if (OPENSSL_issetugid() == 0)
+ s = getenv("HOME");
+#endif
+#ifdef DEFAULT_HOME
+ if (s == NULL) {
+ s = DEFAULT_HOME;
+ }
+#endif
+ if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) {
+ OPENSSL_strlcpy(buf, s, size);
+#ifndef OPENSSL_SYS_VMS
+ OPENSSL_strlcat(buf, "/", size);
+#endif
+ OPENSSL_strlcat(buf, RFILE, size);
+ } else
+ buf[0] = '\0'; /* no file name */
+ }
+
+#ifdef __OpenBSD__
+ /*
+ * given that all random loads just fail if the file can't be seen on a
+ * stat, we stat the file we're returning, if it fails, use /dev/arandom
+ * instead. this allows the user to use their own source for good random
+ * data, but defaults to something hopefully decent if that isn't
+ * available.
+ */
+
+ if (!buf[0])
+ if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
+ return (NULL);
+ }
+ if (stat(buf, &sb) == -1)
+ if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
+ return (NULL);
+ }
+#endif
+ return (buf);
+}