2 * rand.c: System.Security.Cryptography.RNGCryptoServiceProvider support
5 * Mark Crichton (crichton@gimp.org)
6 * Patrik Torstensson (p@rxc.se)
7 * Sebastien Pouliot (sebastien@ximian.com)
9 * (C) 2001 Ximian, Inc.
10 * Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
15 #include <sys/types.h>
20 #include <mono/metadata/object.h>
21 #include <mono/metadata/rand.h>
22 #include <mono/metadata/exception.h>
24 #if !defined(PLATFORM_WIN32)
25 #include <sys/socket.h>
30 get_entropy_from_server (const char *path, guchar *buf, int len)
35 struct sockaddr_un egd_addr;
37 file = socket (PF_UNIX, SOCK_STREAM, 0);
41 egd_addr.sun_family = AF_UNIX;
42 strncpy (egd_addr.sun_path, path, MONO_SIZEOF_SUNPATH - 1);
43 egd_addr.sun_path [MONO_SIZEOF_SUNPATH-1] = '\0';
44 ret = connect (file, (struct sockaddr *)&egd_addr, sizeof(egd_addr));
49 g_warning ("Entropy problem! Can't create or connect to egd socket %s", path);
50 mono_raise_exception (mono_get_exception_execution_engine ("Failed to open egd socket"));
57 request [0] = 2; /* block until daemon can return enough entropy */
58 request [1] = len < 255 ? len : 255;
60 int sent = write (file, request + count, 2 - count);
63 else if (errno == EINTR)
67 g_warning ("Send egd request failed %d", errno);
68 mono_raise_exception (mono_get_exception_execution_engine ("Failed to send request to egd socket"));
73 while (count != request [1]) {
75 received = read(file, buf + offset, request [1] - count);
79 } else if (received < 0 && errno == EINTR) {
83 g_warning ("Receive egd request failed %d", errno);
84 mono_raise_exception (mono_get_exception_execution_engine ("Failed to get response from egd socket"));
95 #if defined (PLATFORM_WIN32)
99 #ifndef PROV_INTEL_SEC
100 #define PROV_INTEL_SEC 22
102 #ifndef CRYPT_VERIFY_CONTEXT
103 #define CRYPT_VERIFY_CONTEXT 0xF0000000
107 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngOpen (void)
109 /* FALSE == Local (instance) handle for randomness */
114 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngInitialize (MonoArray *seed)
116 HCRYPTPROV provider = 0;
118 /* There is no need to create a container for just random data,
119 so we can use CRYPT_VERIFY_CONTEXT (one call) see:
120 http://blogs.msdn.com/dangriff/archive/2003/11/19/51709.aspx */
122 /* We first try to use the Intel PIII RNG if drivers are present */
123 if (!CryptAcquireContext (&provider, NULL, NULL, PROV_INTEL_SEC, CRYPT_VERIFY_CONTEXT)) {
124 /* not a PIII or no drivers available, use default RSA CSP */
125 if (!CryptAcquireContext (&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFY_CONTEXT)) {
127 /* exception will be thrown in managed code */
131 /* seed the CSP with the supplied buffer (if present) */
132 if ((provider != 0) && (seed)) {
133 guint32 len = mono_array_length (seed);
134 guchar *buf = mono_array_addr (seed, guchar, 0);
135 /* the call we replace the seed with random - this isn't what is
136 expected from the class library user */
137 guchar *data = g_malloc (len);
139 memcpy (data, buf, len);
140 /* add seeding material to the RNG */
141 CryptGenRandom (provider, len, data);
142 /* zeroize and free */
143 memset (data, 0, len);
148 return (gpointer) provider;
152 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngGetBytes (gpointer handle, MonoArray *arry)
154 HCRYPTPROV provider = (HCRYPTPROV) handle;
155 guint32 len = mono_array_length (arry);
156 guchar *buf = mono_array_addr (arry, guchar, 0);
158 if (!CryptGenRandom (provider, len, buf)) {
159 CryptReleaseContext (provider, 0);
160 /* we may have lost our context with CryptoAPI, but all hope isn't lost yet! */
161 provider = ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngInitialize (NULL);
162 if (!CryptGenRandom (provider, len, buf)) {
163 CryptReleaseContext (provider, 0);
165 /* exception will be thrown in managed code */
171 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngClose (gpointer handle)
173 CryptReleaseContext ((HCRYPTPROV) handle, 0);
178 #ifndef NAME_DEV_URANDOM
179 #define NAME_DEV_URANDOM "/dev/urandom"
182 static gboolean egd = FALSE;
183 static gint file = -1;
186 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngOpen (void)
188 if (egd || (file >= 0))
191 #if defined (NAME_DEV_URANDOM)
192 file = open (NAME_DEV_URANDOM, O_RDONLY);
195 #if defined (NAME_DEV_RANDOM)
197 file = open (NAME_DEV_RANDOM, O_RDONLY);
201 const char *socket_path = g_getenv("MONO_EGD_SOCKET");
202 egd = (socket_path != NULL);
205 /* TRUE == Global handle for randomness */
210 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngInitialize (MonoArray *seed)
212 /* if required exception will be thrown in managed code */
213 return ((!egd && (file < 0)) ? NULL : GINT_TO_POINTER (file));
217 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngGetBytes (gpointer handle, MonoArray *arry)
219 gint file = GPOINTER_TO_INT (handle);
220 guint32 len = mono_array_length (arry);
221 guchar *buf = mono_array_addr (arry, guchar, 0);
224 const char *socket_path = g_getenv ("MONO_EGD_SOCKET");
225 /* exception will be thrown in managed code */
226 if (socket_path == NULL)
228 get_entropy_from_server (socket_path, mono_array_addr (arry, guchar, 0), mono_array_length (arry));
229 return (gpointer) -1;
232 /* Read until the buffer is filled. This may block if using NAME_DEV_RANDOM. */
237 err = read (file, buf + count, len - count);
239 } while (err >= 0 && count < len);
242 g_warning("Entropy error! Error in read (%s).", strerror (errno));
243 /* exception will be thrown in managed code */
248 /* We do not support PRNG seeding right now but the class library is this */
254 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngClose (gpointer handle)
258 #endif /* OS definition */