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diff --git a/include/opkele/util.h b/include/opkele/util.h
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+#ifndef __OPKELE_UTIL_H
+#define __OPKELE_UTIL_H
+
+#include <time.h>
+#include <string>
+#include <openssl/bn.h>
+#include <openssl/dh.h>
+
+namespace opkele {
+ using std::string;
+
+ namespace util {
+
+ class bignum_t {
+ public:
+ BIGNUM *_bn;
+
+ bignum_t() : _bn(0) { }
+ bignum_t(BIGNUM *bn) : _bn(bn) { }
+ ~bignum_t() throw() { if(_bn) BN_free(_bn); }
+
+ bignum_t& operator=(BIGNUM *bn) { if(_bn) BN_free(_bn); _bn = bn; return *this; }
+
+ operator const BIGNUM*(void) const { return _bn; }
+ operator BIGNUM*(void) { return _bn; }
+ };
+ class dh_t {
+ public:
+ DH *_dh;
+
+ dh_t() : _dh(0) { }
+ dh_t(DH *dh) : _dh(dh) { }
+ ~dh_t() throw() { if(_dh) DH_free(_dh); }
+
+ dh_t& operator=(DH *dh) { if(_dh) DH_free(_dh); _dh = dh; return *this; }
+
+ operator const DH*(void) const { return _dh; }
+ operator DH*(void) { return _dh; }
+
+ DH* operator->() { return _dh; }
+ const DH* operator->() const { return _dh; }
+ };
+
+ BIGNUM *base64_to_bignum(const string& b64);
+ BIGNUM *dec_to_bignum(const string& dec);
+ string bignum_to_base64(const BIGNUM *bn);
+
+ string time_to_w3c(time_t t);
+ time_t w3c_to_time(const string& w);
+
+ string canonicalize_url(const string& url);
+ string url_encode(const string& str);
+
+ string long_to_string(long l);
+ long string_to_long(const string& s);
+ }
+
+}
+
+#endif /* __OPKELE_UTIL_H */