Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/winpr/libwinpr/crypto/rand.c

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+/**
+ * WinPR: Windows Portable Runtime
+ *
+ * Copyright 2015 Marc-Andre Moreau <marcandre.moreau@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <winpr/config.h>
+
+#include <winpr/crt.h>
+
+#include <winpr/crypto.h>
+
+#ifdef WITH_OPENSSL
+#include <openssl/crypto.h>
+#include <openssl/rand.h>
+#endif
+
+#ifdef WITH_MBEDTLS
+#include <mbedtls/md.h>
+#include <mbedtls/entropy.h>
+#ifdef MBEDTLS_HAVEGE_C
+#include <mbedtls/havege.h>
+#endif
+#include <mbedtls/hmac_drbg.h>
+#endif
+
+int winpr_RAND(void* output, size_t len)
+{
+#if defined(WITH_OPENSSL)
+	if (len > INT_MAX)
+		return -1;
+	if (RAND_bytes(output, (int)len) != 1)
+		return -1;
+#elif defined(WITH_MBEDTLS)
+#if defined(MBEDTLS_HAVEGE_C)
+	mbedtls_havege_state hs;
+	mbedtls_havege_init(&hs);
+
+	if (mbedtls_havege_random(&hs, output, len) != 0)
+		return -1;
+
+	mbedtls_havege_free(&hs);
+#else
+	int status;
+	mbedtls_entropy_context entropy;
+	mbedtls_hmac_drbg_context hmac_drbg;
+	const mbedtls_md_info_t* md_info;
+
+	mbedtls_entropy_init(&entropy);
+	mbedtls_hmac_drbg_init(&hmac_drbg);
+
+	md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
+	if ((status = mbedtls_hmac_drbg_seed(&hmac_drbg, md_info, mbedtls_entropy_func, &entropy,
+	                                     nullptr, 0)) != 0)
+		return -1;
+
+	status = mbedtls_hmac_drbg_random(&hmac_drbg, output, len);
+	mbedtls_hmac_drbg_free(&hmac_drbg);
+	mbedtls_entropy_free(&entropy);
+
+	if (status != 0)
+		return -1;
+#endif
+#endif
+	return 0;
+}
+
+int winpr_RAND_pseudo(void* output, size_t len)
+{
+	return winpr_RAND(output, len);
+}