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-rw-r--r--libdevcore/CommonData.cpp40
1 files changed, 38 insertions, 2 deletions
diff --git a/libdevcore/CommonData.cpp b/libdevcore/CommonData.cpp
index 062d1b29..a53d9628 100644
--- a/libdevcore/CommonData.cpp
+++ b/libdevcore/CommonData.cpp
@@ -19,8 +19,12 @@
* @date 2014
*/
-#include "CommonData.h"
-#include "Exceptions.h"
+#include <libdevcore/CommonData.h>
+#include <libdevcore/Exceptions.h>
+#include <libdevcore/SHA3.h>
+
+#include <boost/algorithm/string.hpp>
+
using namespace std;
using namespace dev;
@@ -95,3 +99,35 @@ bytes dev::fromHex(std::string const& _s, WhenError _throw)
}
return ret;
}
+
+
+bool dev::passesAddressChecksum(string const& _str, bool _strict)
+{
+ string s = _str.substr(0, 2) == "0x" ? _str.substr(2) : _str;
+
+ if (s.length() != 40)
+ return false;
+
+ if (!_strict && (
+ _str.find_first_of("abcdef") == string::npos ||
+ _str.find_first_of("ABCDEF") == string::npos
+ ))
+ return true;
+
+ h256 hash = keccak256(boost::algorithm::to_lower_copy(s, std::locale::classic()));
+ for (size_t i = 0; i < 40; ++i)
+ {
+ char addressCharacter = s[i];
+ bool lowerCase;
+ if ('a' <= addressCharacter && addressCharacter <= 'f')
+ lowerCase = true;
+ else if ('A' <= addressCharacter && addressCharacter <= 'F')
+ lowerCase = false;
+ else
+ continue;
+ unsigned nibble = (unsigned(hash[i / 2]) >> (4 * (1 - (i % 2)))) & 0xf;
+ if ((nibble >= 8) == lowerCase)
+ return false;
+ }
+ return true;
+}