CryptoPkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / CryptoPkg / Library / BaseCryptLib / Rand / CryptRandTsc.c

diff --git a/CryptoPkg/Library/BaseCryptLib/Rand/CryptRandTsc.c b/CryptoPkg/Library/BaseCryptLib/Rand/CryptRandTsc.c
index dbdd6383a4d654f284718ebf0b8a9acfe6dd96b4..b0bfd5fb4f96253cdb28a441429d1f15d00ba395 100644 (file)
--- a/CryptoPkg/Library/BaseCryptLib/Rand/CryptRandTsc.c
+++ b/CryptoPkg/Library/BaseCryptLib/Rand/CryptRandTsc.c
@@ -1,19 +1,14 @@
 /** @file\r
   Pseudorandom Number Generator Wrapper Implementation over OpenSSL.\r
 \r
-Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>\r
-This program and the accompanying materials\r
-are licensed and made available under the terms and conditions of the BSD License\r
-which accompanies this distribution.  The full text of the license may be found at\r
-http://opensource.org/licenses/bsd-license.php\r
-\r
-THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
-WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+Copyright (c) 2012 - 2018, Intel Corporation. All rights reserved.<BR>\r
+SPDX-License-Identifier: BSD-2-Clause-Patent\r
 \r
 **/\r
 \r
 #include "InternalCryptLib.h"\r
 #include <openssl/rand.h>\r
+#include <openssl/evp.h>\r
 #include <Library/PrintLib.h>\r
 \r
 /**\r
@@ -45,6 +40,14 @@ RandomSeed (
     return FALSE;\r
   }\r
 \r
+  //\r
+  // The software PRNG implementation built in OpenSSL depends on message digest algorithm.\r
+  // Make sure SHA-1 digest algorithm is available here.\r
+  //\r
+  if (EVP_add_digest (EVP_sha1 ()) == 0) {\r
+    return FALSE;\r
+  }\r
+\r
   //\r
   // Seed the pseudorandom number generator with user-supplied value.\r
   // NOTE: A cryptographic PRNG must be seeded with unpredictable data.\r
@@ -60,7 +63,7 @@ RandomSeed (
       sizeof (DefaultSeed),\r
       "UEFI Crypto Library default seed (%ld)",\r
       AsmReadTsc ()\r
-      ); \r
+      );\r
 \r
     RAND_seed (DefaultSeed, sizeof (DefaultSeed));\r
   }\r
@@ -78,7 +81,7 @@ RandomSeed (
   If Output is NULL, then return FALSE.\r
 \r
   @param[out]  Output  Pointer to buffer to receive random value.\r
-  @param[in]   Size    Size of randome bytes to generate.\r
+  @param[in]   Size    Size of random bytes to generate.\r
 \r
   @retval TRUE   Pseudorandom byte stream generated successfully.\r
   @retval FALSE  Pseudorandom number generator fails to generate due to lack of entropy.\r