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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include "cmConfigure.h" // IWYU pragma: keep
#include <cstddef>
#include <memory>
#include <string>
#include <vector>
#include <cm/string_view>
/**
* @brief Abstract base class for cryptographic hash generators
*/
class cmCryptoHash
{
public:
enum Algo
{
AlgoMD5,
AlgoSHA1,
AlgoSHA224,
AlgoSHA256,
AlgoSHA384,
AlgoSHA512,
AlgoSHA3_224,
AlgoSHA3_256,
AlgoSHA3_384,
AlgoSHA3_512
};
cmCryptoHash(Algo algo);
~cmCryptoHash();
cmCryptoHash(cmCryptoHash const&) = delete;
cmCryptoHash& operator=(cmCryptoHash const&) = delete;
/// @brief Returns a new hash generator of the requested type
/// @arg algo Hash type name. Supported hash types are
/// MD5, SHA1, SHA224, SHA256, SHA384, SHA512,
/// SHA3_224, SHA3_256, SHA3_384, SHA3_512
/// @return A valid auto pointer if algo is supported or
/// an invalid/NULL pointer otherwise
static std::unique_ptr<cmCryptoHash> New(cm::string_view algo);
/// @brief Converts a hex character to its binary value (4 bits)
/// @arg input Hex character [0-9a-fA-F].
/// @arg output Binary value of the input character (4 bits)
/// @return True if input was a valid hex character
static bool IntFromHexDigit(char input, char& output);
/// @brief Converts a byte hash to a sequence of hex character pairs
static std::string ByteHashToString(const std::vector<unsigned char>& hash);
/// @brief Calculates a binary hash from string input data
/// @return Binary hash vector
std::vector<unsigned char> ByteHashString(cm::string_view input);
/// @brief Calculates a binary hash from file content
/// @see ByteHashString()
/// @return Non empty binary hash vector if the file was read successfully.
/// An empty vector otherwise.
std::vector<unsigned char> ByteHashFile(const std::string& file);
/// @brief Calculates a hash string from string input data
/// @return Sequence of hex characters pairs for each byte of the binary hash
std::string HashString(cm::string_view input);
/// @brief Calculates a hash string from file content
/// @see HashString()
/// @return Non empty hash string if the file was read successfully.
/// An empty string otherwise.
std::string HashFile(const std::string& file);
void Initialize();
void Append(void const*, size_t);
void Append(cm::string_view input);
std::vector<unsigned char> Finalize();
std::string FinalizeHex();
private:
unsigned int Id;
struct rhash_context* CTX;
};
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