Adding OpenSSL random number functions to openssl plugin
authorAleksandr Grinberg <alex@cessp.it>
Wed, 20 Jun 2012 20:39:37 +0000 (13:39 -0700)
committerTobias Brunner <tobias@strongswan.org>
Mon, 25 Jun 2012 14:35:05 +0000 (16:35 +0200)
src/libstrongswan/plugins/openssl/Makefile.am
src/libstrongswan/plugins/openssl/openssl_plugin.c
src/libstrongswan/plugins/openssl/openssl_rng.c [new file with mode: 0644]
src/libstrongswan/plugins/openssl/openssl_rng.h [new file with mode: 0644]

index 5c845a1..ffbeaba 100644 (file)
@@ -22,7 +22,8 @@ libstrongswan_openssl_la_SOURCES = \
        openssl_ec_private_key.c openssl_ec_private_key.h \
        openssl_ec_public_key.c openssl_ec_public_key.h \
        openssl_x509.c openssl_x509.h \
        openssl_ec_private_key.c openssl_ec_private_key.h \
        openssl_ec_public_key.c openssl_ec_public_key.h \
        openssl_x509.c openssl_x509.h \
-       openssl_crl.c openssl_crl.h
+       openssl_crl.c openssl_crl.h \
+       openssl_rng.c openssl_rng.h
 
 libstrongswan_openssl_la_LDFLAGS = -module -avoid-version
 libstrongswan_openssl_la_LIBADD  = -lcrypto
 
 libstrongswan_openssl_la_LDFLAGS = -module -avoid-version
 libstrongswan_openssl_la_LIBADD  = -lcrypto
index 9177dab..c952377 100644 (file)
@@ -40,6 +40,7 @@
 #include "openssl_ec_public_key.h"
 #include "openssl_x509.h"
 #include "openssl_crl.h"
 #include "openssl_ec_public_key.h"
 #include "openssl_x509.h"
 #include "openssl_crl.h"
+#include "openssl_rng.h"
 
 typedef struct private_openssl_plugin_t private_openssl_plugin_t;
 
 
 typedef struct private_openssl_plugin_t private_openssl_plugin_t;
 
@@ -363,6 +364,9 @@ METHOD(plugin_t, get_features, int,
                PLUGIN_PROVIDE(PUBKEY_VERIFY, SIGN_ECDSA_521),
 #endif
 #endif /* OPENSSL_NO_ECDSA */
                PLUGIN_PROVIDE(PUBKEY_VERIFY, SIGN_ECDSA_521),
 #endif
 #endif /* OPENSSL_NO_ECDSA */
+               PLUGIN_REGISTER(RNG, openssl_rng_create),
+                       PLUGIN_PROVIDE(RNG, RNG_STRONG),
+                       PLUGIN_PROVIDE(RNG, RNG_WEAK),
        };
        *features = f;
        return countof(f);
        };
        *features = f;
        return countof(f);
diff --git a/src/libstrongswan/plugins/openssl/openssl_rng.c b/src/libstrongswan/plugins/openssl/openssl_rng.c
new file mode 100644 (file)
index 0000000..abb4622
--- /dev/null
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012 Aleksandr Grinberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <debug.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+
+#include "openssl_rng.h"
+
+typedef struct private_openssl_rng_t private_openssl_rng_t;
+
+/**
+ * Private data of openssl_rng_t
+ */
+struct private_openssl_rng_t {
+
+       /**
+        * Public part of this class.
+        */
+       openssl_rng_t public;
+
+       /**
+        * Quality of randomness
+        */
+       rng_quality_t quality;
+};
+
+METHOD(rng_t, get_bytes, void,
+       private_openssl_rng_t *this, size_t bytes, u_int8_t *buffer)
+{
+       u_int32_t ret=0;
+
+       if (this->quality == RNG_STRONG)
+       {
+               ret = RAND_bytes((char*)buffer, bytes);
+       }
+       else
+       {
+               ret = RAND_pseudo_bytes((char*)buffer, bytes);
+       }
+
+       if (ret == 0)
+       {
+               DBG1(DBG_LIB, "getting randomness from openssl failed.");
+       }
+}
+
+METHOD(rng_t, allocate_bytes, void,
+       private_openssl_rng_t *this, size_t bytes, chunk_t *chunk)
+{
+       *chunk = chunk_alloc(bytes);
+       get_bytes(this, chunk->len, chunk->ptr);
+}
+
+METHOD(rng_t, destroy, void,
+       private_openssl_rng_t *this)
+{
+       free(this);
+}
+
+/*
+ * Described in header.
+ */
+openssl_rng_t *openssl_rng_create(rng_quality_t quality)
+{
+       private_openssl_rng_t *this;
+
+       INIT(this,
+               .public = {
+                       .rng = {
+                               .get_bytes = _get_bytes,
+                               .allocate_bytes = _allocate_bytes,
+                               .destroy = _destroy,
+                       },
+               },
+               .quality = quality,
+       );
+
+       return &this->public;
+}
diff --git a/src/libstrongswan/plugins/openssl/openssl_rng.h b/src/libstrongswan/plugins/openssl/openssl_rng.h
new file mode 100644 (file)
index 0000000..a459656
--- /dev/null
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2012 Aleksandr Grinberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @defgroup openssl_rng openssl_rng
+ * @{ @ingroup openssl_p
+ */
+
+#ifndef OPENSSL_RNG_H_
+#define OPENSSL_RNG_H_
+
+#include <library.h>
+
+typedef struct openssl_rng_t openssl_rng_t;
+
+/**
+ * Implementation of random number using OpenSSL.
+ */
+struct openssl_rng_t {
+
+       /**
+        * Implements rng_t interface.
+        */
+       rng_t rng;
+};
+
+/**
+ * Constructor to create openssl_rng_t.
+ *
+ * @param quality      quality of randomness
+ * @return                     openssl_rng_t
+ */
+openssl_rng_t *openssl_rng_create(rng_quality_t quality);
+
+#endif /** OPENSSL_RNG_H_ @}*/