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/* -*- C++ -*-
* This code is derived from (original license follows):
* This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
* MD5 Message-Digest Algorithm (RFC 1321).
* Homepage:
* Author:
* Alexander Peslyak, better known as Solar Designer <solar at>
* This software was written by Alexander Peslyak in 2001. No copyright is
* claimed, and the software is hereby placed in the public domain.
* In case this attempt to disclaim copyright and place the software in the
* public domain is deemed null and void, then the software is
* Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
* general public under the following terms:
* Redistribution and use in source and binary forms, with or without
* modification, are permitted.
* There's ABSOLUTELY NO WARRANTY, express or implied.
* See md5.c for more information.
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Endian.h"
#include <array>
#include <cstdint>
namespace llvm {
template <typename T> class ArrayRef;
class MD5 {
// Any 32-bit or wider unsigned integer data type will do.
typedef uint32_t MD5_u32plus;
MD5_u32plus a = 0x67452301;
MD5_u32plus b = 0xefcdab89;
MD5_u32plus c = 0x98badcfe;
MD5_u32plus d = 0x10325476;
MD5_u32plus hi = 0;
MD5_u32plus lo = 0;
uint8_t buffer[64];
MD5_u32plus block[16];
struct MD5Result {
std::array<uint8_t, 16> Bytes;
operator std::array<uint8_t, 16>() const { return Bytes; }
const uint8_t &operator[](size_t I) const { return Bytes[I]; }
uint8_t &operator[](size_t I) { return Bytes[I]; }
SmallString<32> digest() const;
uint64_t low() const {
// Our MD5 implementation returns the result in little endian, so the low
// word is first.
using namespace support;
return endian::read<uint64_t, little, unaligned>(;
uint64_t high() const {
using namespace support;
return endian::read<uint64_t, little, unaligned>( + 8);
std::pair<uint64_t, uint64_t> words() const {
using namespace support;
return std::make_pair(high(), low());
/// Updates the hash for the byte stream provided.
void update(ArrayRef<uint8_t> Data);
/// Updates the hash for the StringRef provided.
void update(StringRef Str);
/// Finishes off the hash and puts the result in result.
void final(MD5Result &Result);
/// Translates the bytes in \p Res to a hex string that is
/// deposited into \p Str. The result will be of length 32.
static void stringifyResult(MD5Result &Result, SmallString<32> &Str);
/// Computes the hash for a given bytes.
static std::array<uint8_t, 16> hash(ArrayRef<uint8_t> Data);
const uint8_t *body(ArrayRef<uint8_t> Data);
inline bool operator==(const MD5::MD5Result &LHS, const MD5::MD5Result &RHS) {
return LHS.Bytes == RHS.Bytes;
/// Helper to compute and return lower 64 bits of the given string's MD5 hash.
inline uint64_t MD5Hash(StringRef Str) {
using namespace support;
MD5 Hash;
MD5::MD5Result Result;;
// Return the least significant word.
return Result.low();
} // end namespace llvm
#endif // LLVM_SUPPORT_MD5_H