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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
// Written in 2014 by Nils Maier
#ifndef CRYPTO_HASH_H
#define CRYPTO_HASH_H
#include <cstdint>
#include <cstring>
#include <memory>
#include <set>
#include <string>
#include <limits>
namespace crypto {
namespace hash {
enum Algorithms {
algoNone = 0x0,
algoMD5 = 0x1,
algoSHA1 = 0x2,
algoSHA224 = 0x3,
algoSHA256 = 0x4,
algoSHA384 = 0x5,
algoSHA512 = 0x6,
};
class Algorithm {
public:
Algorithm() = default;
virtual ~Algorithm() = default;
virtual void update(const void* data, uint64_t len) = 0;
inline void update(const std::string& data)
{
return update(data.data(), data.length());
}
virtual std::string finalize() = 0;
virtual void reset() = 0;
virtual uint_fast16_t length() const = 0;
virtual uint_fast16_t blocksize() const = 0;
private:
Algorithm(const Algorithm&) = delete;
Algorithm& operator=(const Algorithm&) = delete;
};
const std::set<std::string>& all();
Algorithms lookup(const std::string& name);
std::unique_ptr<Algorithm> create(Algorithms algo);
inline std::unique_ptr<Algorithm> create(const std::string& name)
{
return create(lookup(name));
}
inline uint_fast16_t length(Algorithms algo) { return create(algo)->length(); }
inline uint_fast16_t length(const std::string& name)
{
return create(name)->length();
}
inline std::string compute(Algorithms algo, const void* data, uint_fast64_t len)
{
auto ctx = create(algo);
ctx->update(data, len);
return ctx->finalize();
}
inline std::string compute(Algorithms algo, const std::string& data)
{
return compute(algo, data.data(), data.length());
}
inline std::string compute(const std::string& name, const void* data,
uint_fast64_t len)
{
return compute(lookup(name), data, len);
}
inline std::string compute(const std::string& name, const std::string& data)
{
return compute(lookup(name), data.data(), data.length());
}
} // namespace hash
} // namespace crypto
#endif // CRYPTO_HASH_H
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