Digest.h

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#ifndef FWCore_Utilities_Digest_h
#define FWCore_Utilities_Digest_h

#include "FWCore/Utilities/interface/md5.h"

#include <iosfwd>
#include <string>


namespace cms
{

  struct MD5Result
  {
    // The default-constructed MD5Result is invalid; all others are
    // valid. The MD5 digest of the empty string is the value of the
    // default-constructed MD5Result.
    MD5Result();

    // This is the MD5 digest.
    unsigned char bytes[16];

    // Convert the digest to a printable string (the 'hexdigest')
    std::string toString() const;

    // The MD5 digest (not hexdigest) in string form
    // 'std::basic_string<char>', rather than
    // 'unsigned char [16]'
    std::string compactForm() const;

    // Set our data from the given hexdigest string.
    void fromHexifiedString(std::string const& s);

    bool isValid() const;
  };

  bool operator==(MD5Result const& a, MD5Result const& b);
  bool operator< (MD5Result const& a, MD5Result const& b);

  inline bool operator!=(MD5Result const& a, MD5Result const& b)
  {
    return !(a==b);
  }

  inline
  std::ostream& operator<< (std::ostream& os, MD5Result const& r)
  {
    os << r.toString();
    return os;
  }

  // Digest creates an MD5 digest of the given string. The digest can
  // be updated by using 'append'.
  class Digest
  {
  public:
    Digest();
    explicit Digest(std::string const& s);

    void append(std::string const& s);

    MD5Result digest() const;

  private:
    mutable md5_state_t state_;
  };
}

#endif