diff --git a/dap-sdk/crypto/src/XKCP/lib/high/Keccak/FIPS202/SimpleFIPS202.h b/dap-sdk/crypto/src/XKCP/lib/high/Keccak/FIPS202/SimpleFIPS202.h
index 73559dedce4f957d418b678b796cbda06c885b30..efc5b1aa67a2d6e9e5f93a884fcf6a8f81575e6c 100755
--- a/dap-sdk/crypto/src/XKCP/lib/high/Keccak/FIPS202/SimpleFIPS202.h
+++ b/dap-sdk/crypto/src/XKCP/lib/high/Keccak/FIPS202/SimpleFIPS202.h
@@ -15,6 +15,10 @@ http://creativecommons.org/publicdomain/zero/1.0/
 #include "KeccakSpongeWidth1600.h"
 #include <string.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** Implementation of the SHAKE128 extendable output function (XOF) [FIPS 202].
   * @param  output          Pointer to the output buffer.
   * @param  outputByteLen   The desired number of output bytes.
@@ -74,4 +78,8 @@ int SHA3_384(unsigned char *output, const unsigned char *input, size_t inputByte
   */
 int SHA3_512(unsigned char *output, const unsigned char *input, size_t inputByteLen);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif