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#pragma once
#include "slang.h"
#include "../core/slang-string.h"
#include "../core/slang-blob.h"
#include "../core/slang-list.h"
namespace Slang
{
struct DigestUtil
{
/// Convert a binary digest to a string (lower-case hexadecimal).
/// Returned string is double the length of the digest.
static String digestToString(const void* digest, SlangInt digestSize);
/// Convert a string to a binary digest.
/// Expects a string of double the length of the digest size in hexadecimal format.
/// Sets the digest to all zeros if the string is invalid.
/// Returns true if string was converted successfully.
static bool stringToDigest(const char* str, SlangInt strLength, void *digest, SlangInt digestSize);
};
/// Represents a hash digest. Only sizes of multiple of 4 are supported.
template<SlangInt N>
class HashDigest
{
public:
static_assert(N % 4 == 0, "size must be multiple of 4");
uint32_t data[N / 4] = { 0 };
HashDigest() = default;
HashDigest(const char* str)
{
DigestUtil::stringToDigest(str, ::strlen(str), data, N);
}
HashDigest(const String& str)
{
DigestUtil::stringToDigest(str.getBuffer(), str.getLength(), data, N);
}
HashDigest(const UnownedStringSlice& str)
{
DigestUtil::stringToDigest(str.begin(), str.getLength(), data, N);
}
HashDigest(ISlangBlob* blob)
{
if (blob->getBufferSize() == N)
{
::memcpy(data, blob->getBufferPointer(), N);
}
}
String toString() const
{
return DigestUtil::digestToString(data, N);
}
ComPtr<ISlangBlob> toBlob() const
{
return RawBlob::create(data, sizeof(data));
}
bool operator==(const HashDigest& other) const
{
return ::memcmp(data, other.data, sizeof(data)) == 0;
}
bool operator!=(const HashDigest& other) const
{
return !(*this == other);
}
uint32_t getHashCode() const
{
return data[0];
}
};
/// MD5 hash generator implementing https://www.ietf.org/rfc/rfc1321.txt
class MD5
{
public:
using Digest = HashDigest<16>;
MD5();
void init();
void update(const void* data, SlangSizeT size);
Digest finalize();
static Digest compute(const void* data, SlangInt size);
private:
const void* processBlock(const void* data, SlangInt size);
uint32_t m_lo, m_hi;
uint32_t m_a, m_b, m_c, m_d;
uint32_t m_block[16];
uint8_t m_buffer[64];
};
/// SHA1 hash generator implementing https://www.ietf.org/rfc/rfc3174.txt
class SHA1
{
public:
using Digest = HashDigest<20>;
SHA1();
void init();
void update(const void* data, SlangSizeT size);
Digest finalize();
static Digest compute(const void* data, SlangInt size);
private:
void addByte(uint8_t x);
void processBlock(const uint8_t* ptr);
uint32_t m_index;
uint64_t m_bits;
uint32_t m_state[5];
uint8_t m_buf[64];
};
// Helper class for building hashes.
template<typename Hash>
struct DigestBuilder
{
public:
void append(const void* data, SlangInt size)
{
m_hash.update(data, size);
}
template<typename T, typename std::enable_if<std::is_arithmetic<T>::value || std::is_enum<T>::value, int>::type = 0>
void append(const T value)
{
append(&value, sizeof(T));
}
void append(const String& str)
{
append(str.getBuffer(), str.getLength());
}
void append(const StringSlice& str)
{
append(str.begin(), str.getLength());
}
void append(const UnownedStringSlice& str)
{
append(str.begin(), str.getLength());
}
void append(ISlangBlob* blob)
{
append(blob->getBufferPointer(), blob->getBufferSize());
}
template<SlangInt N>
void append(const HashDigest<N>& digest)
{
append(digest.data, sizeof(digest.data));
}
template<typename T, std::enable_if_t<std::has_unique_object_representations_v<T>, int> = 0>
void append(const List<T>& list)
{
append(list.getBuffer(), list.getCount() * sizeof(T));
}
typename Hash::Digest finalize()
{
return m_hash.finalize();
}
private:
Hash m_hash;
};
}
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