Add string(MD5) and string(SHA*) commands to compute hashes

Provide a CMake-language binding to these cryptographic hashes.  Add a
string() command API for MD5, SHA1, SHA224, SHA256, SHA384, and SHA512.

Source/cmStringCommand.cxx

@@ -10,6 +10,8 @@
   See the License for more information.
 ============================================================================*/
 #include "cmStringCommand.h"
+#include "cmCryptoHash.h"
+
 #include <cmsys/RegularExpression.hxx>
 #include <cmsys/SystemTools.hxx>
 
@@ -36,6 +38,15 @@ bool cmStringCommand
     {
     return this->HandleReplaceCommand(args);
     }
+  else if ( subCommand == "MD5" ||
+            subCommand == "SHA1" ||
+            subCommand == "SHA224" ||
+            subCommand == "SHA256" ||
+            subCommand == "SHA384" ||
+            subCommand == "SHA512" )
+    {
+    return this->HandleHashCommand(args);
+    }
   else if(subCommand == "TOLOWER")
     {
     return this->HandleToUpperLowerCommand(args, false);
@@ -82,6 +93,27 @@ bool cmStringCommand
   return false;
 }
 
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleHashCommand(std::vector<std::string> const& args)
+{
+  if(args.size() != 3)
+    {
+    cmOStringStream e;
+    e << args[0] << " requires an output variable and an input string";
+    this->SetError(e.str().c_str());
+    return false;
+    }
+
+  cmsys::auto_ptr<cmCryptoHash> hash(cmCryptoHash::New(args[0].c_str()));
+  if(hash.get())
+    {
+    std::string out = hash->HashString(args[2].c_str());
+    this->Makefile->AddDefinition(args[1].c_str(), out.c_str());
+    return true;
+    }
+  return false;
+}
+
 //----------------------------------------------------------------------------
 bool cmStringCommand::HandleToUpperLowerCommand(
   std::vector<std::string> const& args, bool toUpper)

Source/cmStringCommand.h

@@ -76,6 +76,8 @@ public:
       "  string(REPLACE <match_string>\n"
       "         <replace_string> <output variable>\n"
       "         <input> [<input>...])\n"
+      "  string(<MD5|SHA1|SHA224|SHA256|SHA384|SHA512>\n"
+      "         <output variable> <input>)\n"
       "  string(COMPARE EQUAL <string1> <string2> <output variable>)\n"
       "  string(COMPARE NOTEQUAL <string1> <string2> <output variable>)\n"
       "  string(COMPARE LESS <string1> <string2> <output variable>)\n"
@@ -103,6 +105,8 @@ public:
       "backslash through argument parsing.\n"
       "REPLACE will replace all occurrences of match_string in the input with "
       "replace_string and store the result in the output.\n"
+      "MD5, SHA1, SHA224, SHA256, SHA384, and SHA512 "
+      "will compute a cryptographic hash of the input string.\n"
       "COMPARE EQUAL/NOTEQUAL/LESS/GREATER will compare the strings and "
       "store true or false in the output variable.\n"
       "ASCII will convert all numbers into corresponding ASCII characters.\n"
@@ -150,6 +154,7 @@ protected:
   bool RegexMatch(std::vector<std::string> const& args);
   bool RegexMatchAll(std::vector<std::string> const& args);
   bool RegexReplace(std::vector<std::string> const& args);
+  bool HandleHashCommand(std::vector<std::string> const& args);
   bool HandleToUpperLowerCommand(std::vector<std::string> const& args,
                                  bool toUpper);
   bool HandleCompareCommand(std::vector<std::string> const& args);

Tests/CMakeTests/String-MD5-BadArg1.cmake

@@ -0,0 +1 @@
+string(MD5)

Tests/CMakeTests/String-MD5-BadArg2.cmake

@@ -0,0 +1 @@
+string(MD5 md5)

Tests/CMakeTests/String-MD5-BadArg4.cmake

@@ -0,0 +1 @@
+string(MD5 md5 input extra_arg)

Tests/CMakeTests/String-MD5-Works.cmake

@@ -0,0 +1,2 @@
+string(MD5 md5 "sample input string\n")
+message("${md5}")

Tests/CMakeTests/String-SHA1-Works.cmake

@@ -0,0 +1,2 @@
+string(SHA1 sha1 "sample input string\n")
+message("${sha1}")

Tests/CMakeTests/String-SHA224-Works.cmake

@@ -0,0 +1,2 @@
+string(SHA224 sha224 "sample input string\n")
+message("${sha224}")

Tests/CMakeTests/String-SHA256-Works.cmake

@@ -0,0 +1,2 @@
+string(SHA256 sha256 "sample input string\n")
+message("${sha256}")

Tests/CMakeTests/String-SHA384-Works.cmake

@@ -0,0 +1,2 @@
+string(SHA384 sha384 "sample input string\n")
+message("${sha384}")

Tests/CMakeTests/String-SHA512-Works.cmake

@@ -0,0 +1,2 @@
+string(SHA512 sha512 "sample input string\n")
+message("${sha512}")

Tests/CMakeTests/StringTest.cmake.in

@@ -1,3 +1,35 @@
+set(MD5-BadArg1-RESULT 1)
+set(MD5-BadArg1-STDERR "string MD5 requires an output variable")
+set(MD5-BadArg2-RESULT 1)
+set(MD5-BadArg2-STDERR "string MD5 requires an output variable and an input string")
+set(MD5-BadArg4-RESULT 1)
+set(MD5-BadArg4-STDERR "string MD5 requires an output variable and an input string")
+set(MD5-Works-RESULT 0)
+set(MD5-Works-STDERR "10d20ddb981a6202b84aa1ce1cb7fce3")
+set(SHA1-Works-RESULT 0)
+set(SHA1-Works-STDERR "83f093e04289b21a9415f408ad50be8b57ad2f34")
+set(SHA224-Works-RESULT 0)
+set(SHA224-Works-STDERR "e995a7789922c4ef9279d94e763c8375934180a51baa7147bc48edf7")
+set(SHA256-Works-RESULT 0)
+set(SHA256-Works-STDERR "d1c5915d8b71150726a1eef75a29ec6bea8fd1bef6b7299ef8048760b0402025")
+set(SHA384-Works-RESULT 0)
+set(SHA384-Works-STDERR "1de9560b4e030e02051ea408200ffc55d70c97ac64ebf822461a5c786f495c36df43259b14483bc8d364f0106f4971ee")
+set(SHA512-Works-RESULT 0)
+set(SHA512-Works-STDERR "3982a1b4e651768bec70ab1fb97045cb7a659f4ba7203d501c52ab2e803071f9d5fd272022df15f27727fc67f8cd022e710e29010b2a9c0b467c111e2f6abf51")
+
+include("@CMAKE_CURRENT_SOURCE_DIR@/CheckCMakeTest.cmake")
+check_cmake_test(String
+  MD5-BadArg1
+  MD5-BadArg2
+  MD5-BadArg4
+  MD5-Works
+  SHA1-Works
+  SHA224-Works
+  SHA256-Works
+  SHA384-Works
+  SHA512-Works
+  )
+
 # Execute each test listed in StringTestScript.cmake:
 #
 set(scriptname "@CMAKE_CURRENT_SOURCE_DIR@/StringTestScript.cmake")