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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. */
#ifndef cmCryptoHash_h
#define cmCryptoHash_h
#include <cmConfigure.h>
#include <cm_auto_ptr.hxx>
#include <string>
#include <vector>
/**
* @brief Abstract base class for cryptographic hash generators
*/
class cmCryptoHash
{
public:
virtual ~cmCryptoHash() {}
/// @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
/// @return A valid auto pointer if algo is supported or
/// an invalid/NULL pointer otherwise
static CM_AUTO_PTR<cmCryptoHash> New(const char* 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(const std::string& 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(const std::string& 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);
protected:
virtual void Initialize() = 0;
virtual void Append(unsigned char const*, int) = 0;
virtual std::vector<unsigned char> Finalize() = 0;
};
class cmCryptoHashMD5 : public cmCryptoHash
{
struct cmsysMD5_s* MD5;
public:
cmCryptoHashMD5();
~cmCryptoHashMD5() CM_OVERRIDE;
protected:
void Initialize() CM_OVERRIDE;
void Append(unsigned char const* buf, int sz) CM_OVERRIDE;
std::vector<unsigned char> Finalize() CM_OVERRIDE;
};
#define cmCryptoHash_SHA_CLASS_DECL(SHA) \
class cmCryptoHash##SHA : public cmCryptoHash \
{ \
union _SHA_CTX* SHA; \
\
public: \
cmCryptoHash##SHA(); \
~cmCryptoHash##SHA(); \
\
protected: \
virtual void Initialize(); \
virtual void Append(unsigned char const* buf, int sz); \
virtual std::vector<unsigned char> Finalize(); \
}
cmCryptoHash_SHA_CLASS_DECL(SHA1);
cmCryptoHash_SHA_CLASS_DECL(SHA224);
cmCryptoHash_SHA_CLASS_DECL(SHA256);
cmCryptoHash_SHA_CLASS_DECL(SHA384);
cmCryptoHash_SHA_CLASS_DECL(SHA512);
#undef cmCryptoHash_SHA_CLASS_DECL
#endif
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