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 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
10 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
15 #include <sys/types.h>
25 #include <mono/metadata/object.h>
26 #include <mono/metadata/rand.h>
27 #include <mono/metadata/exception.h>
29 #if defined(__native_client__)
33 get_entropy_from_server (const char *path, guchar *buf, int len)
38 #else /* defined(__native_client__) */
40 #if !defined(HOST_WIN32)
41 #include <sys/socket.h>
46 get_entropy_from_server (const char *path, guchar *buf, int len)
51 struct sockaddr_un egd_addr;
53 file = socket (PF_UNIX, SOCK_STREAM, 0);
57 egd_addr.sun_family = AF_UNIX;
58 strncpy (egd_addr.sun_path, path, MONO_SIZEOF_SUNPATH - 1);
59 egd_addr.sun_path [MONO_SIZEOF_SUNPATH-1] = '\0';
60 ret = connect (file, (struct sockaddr *)&egd_addr, sizeof(egd_addr));
65 g_warning ("Entropy problem! Can't create or connect to egd socket %s", path);
66 mono_raise_exception (mono_get_exception_execution_engine ("Failed to open egd socket"));
73 request [0] = 2; /* block until daemon can return enough entropy */
74 request [1] = len < 255 ? len : 255;
76 int sent = write (file, request + count, 2 - count);
79 else if (errno == EINTR)
83 g_warning ("Send egd request failed %d", errno);
84 mono_raise_exception (mono_get_exception_execution_engine ("Failed to send request to egd socket"));
89 while (count != request [1]) {
91 received = read(file, buf + offset, request [1] - count);
95 } else if (received < 0 && errno == EINTR) {
99 g_warning ("Receive egd request failed %d", errno);
100 mono_raise_exception (mono_get_exception_execution_engine ("Failed to get response from egd socket"));
110 #endif /* __native_client__ */
112 #if defined (HOST_WIN32)
115 #include <wincrypt.h>
117 #ifndef PROV_INTEL_SEC
118 #define PROV_INTEL_SEC 22
120 #ifndef CRYPT_VERIFY_CONTEXT
121 #define CRYPT_VERIFY_CONTEXT 0xF0000000
125 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngOpen (void)
127 /* FALSE == Local (instance) handle for randomness */
132 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngInitialize (MonoArray *seed)
134 HCRYPTPROV provider = 0;
136 /* There is no need to create a container for just random data,
137 so we can use CRYPT_VERIFY_CONTEXT (one call) see:
138 http://blogs.msdn.com/dangriff/archive/2003/11/19/51709.aspx */
140 /* We first try to use the Intel PIII RNG if drivers are present */
141 if (!CryptAcquireContext (&provider, NULL, NULL, PROV_INTEL_SEC, CRYPT_VERIFY_CONTEXT)) {
142 /* not a PIII or no drivers available, use default RSA CSP */
143 if (!CryptAcquireContext (&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFY_CONTEXT)) {
145 /* exception will be thrown in managed code */
149 /* seed the CSP with the supplied buffer (if present) */
150 if ((provider != 0) && (seed)) {
151 guint32 len = mono_array_length (seed);
152 guchar *buf = mono_array_addr (seed, guchar, 0);
153 /* the call we replace the seed with random - this isn't what is
154 expected from the class library user */
155 guchar *data = g_malloc (len);
157 memcpy (data, buf, len);
158 /* add seeding material to the RNG */
159 CryptGenRandom (provider, len, data);
160 /* zeroize and free */
161 memset (data, 0, len);
166 return (gpointer) provider;
170 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngGetBytes (gpointer handle, MonoArray *arry)
172 HCRYPTPROV provider = (HCRYPTPROV) handle;
173 guint32 len = mono_array_length (arry);
174 guchar *buf = mono_array_addr (arry, guchar, 0);
176 if (!CryptGenRandom (provider, len, buf)) {
177 CryptReleaseContext (provider, 0);
178 /* we may have lost our context with CryptoAPI, but all hope isn't lost yet! */
179 provider = (HCRYPTPROV) ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngInitialize (NULL);
180 if (!CryptGenRandom (provider, len, buf)) {
181 CryptReleaseContext (provider, 0);
183 /* exception will be thrown in managed code */
186 return (gpointer) provider;
190 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngClose (gpointer handle)
192 CryptReleaseContext ((HCRYPTPROV) handle, 0);
197 #ifndef NAME_DEV_URANDOM
198 #define NAME_DEV_URANDOM "/dev/urandom"
201 static gboolean egd = FALSE;
202 static gint file = -1;
205 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngOpen (void)
207 if (egd || (file >= 0))
210 #if defined (NAME_DEV_URANDOM)
211 file = open (NAME_DEV_URANDOM, O_RDONLY);
214 #if defined (NAME_DEV_RANDOM)
216 file = open (NAME_DEV_RANDOM, O_RDONLY);
220 const char *socket_path = g_getenv("MONO_EGD_SOCKET");
221 egd = (socket_path != NULL);
224 /* TRUE == Global handle for randomness */
229 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngInitialize (MonoArray *seed)
231 /* if required exception will be thrown in managed code */
232 return ((!egd && (file < 0)) ? NULL : GINT_TO_POINTER (file));
236 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngGetBytes (gpointer handle, MonoArray *arry)
238 gint file = GPOINTER_TO_INT (handle);
239 guint32 len = mono_array_length (arry);
240 guchar *buf = mono_array_addr (arry, guchar, 0);
243 const char *socket_path = g_getenv ("MONO_EGD_SOCKET");
244 /* exception will be thrown in managed code */
245 if (socket_path == NULL)
247 get_entropy_from_server (socket_path, mono_array_addr (arry, guchar, 0), mono_array_length (arry));
248 return (gpointer) -1;
250 /* Read until the buffer is filled. This may block if using NAME_DEV_RANDOM. */
255 err = read (file, buf + count, len - count);
262 } while (count < len);
265 g_warning("Entropy error! Error in read (%s).", strerror (errno));
266 /* exception will be thrown in managed code */
271 /* We do not support PRNG seeding right now but the class library is this */
277 ves_icall_System_Security_Cryptography_RNGCryptoServiceProvider_RngClose (gpointer handle)
281 #endif /* OS definition */