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authorchriseth <c@ethdev.com>2017-01-25 06:36:07 +0800
committerchriseth <c@ethdev.com>2017-01-25 06:37:48 +0800
commit3949624a61b1dd0c32e67d30fe7d46b2511c583f (patch)
tree796125372166adcc3207927650666186f32edbd8 /libdevcore
parent605455f96b64f0c4b229cc31186f2dcf22433e6d (diff)
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Also check library addresses.
Diffstat (limited to 'libdevcore')
-rw-r--r--libdevcore/CommonData.cpp40
-rw-r--r--libdevcore/CommonData.h5
2 files changed, 43 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;
+}
diff --git a/libdevcore/CommonData.h b/libdevcore/CommonData.h
index 5ffcdcca..e0a6d221 100644
--- a/libdevcore/CommonData.h
+++ b/libdevcore/CommonData.h
@@ -179,4 +179,9 @@ bool contains(T const& _t, V const& _v)
return std::end(_t) != std::find(std::begin(_t), std::end(_t), _v);
}
+/// @returns true iff @a _str passess the hex address checksum test.
+/// @param _strict if false, hex strings with only uppercase or only lowercase letters
+/// are considered valid.
+bool passesAddressChecksum(std::string const& _str, bool _strict);
+
}