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fa2161f1a7
In doing so, clean up the MD5 interface a little. Most existing users only care about the lower 8 bytes of an MD5, but for some users that care about the upper and lower, there wasn't a good interface. Furthermore, consumers of the MD5 checksum were required to handle endianness details on their own, so it seems reasonable to abstract this into a nicer interface that just gives you the right value. Differential Revision: https://reviews.llvm.org/D31105 llvm-svn: 298322
123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
/* -*- C++ -*-
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* This code is derived from (original license follows):
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*
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* This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
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* MD5 Message-Digest Algorithm (RFC 1321).
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*
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* Homepage:
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* http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
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*
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* Author:
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* Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
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*
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* This software was written by Alexander Peslyak in 2001. No copyright is
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* claimed, and the software is hereby placed in the public domain.
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* In case this attempt to disclaim copyright and place the software in the
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* public domain is deemed null and void, then the software is
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* Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
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* general public under the following terms:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted.
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*
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* There's ABSOLUTELY NO WARRANTY, express or implied.
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*
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* See md5.c for more information.
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*/
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#ifndef LLVM_SUPPORT_MD5_H
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#define LLVM_SUPPORT_MD5_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Endian.h"
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#include <array>
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#include <cstdint>
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namespace llvm {
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template <typename T> class ArrayRef;
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class MD5 {
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// Any 32-bit or wider unsigned integer data type will do.
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typedef uint32_t MD5_u32plus;
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MD5_u32plus a = 0x67452301;
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MD5_u32plus b = 0xefcdab89;
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MD5_u32plus c = 0x98badcfe;
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MD5_u32plus d = 0x10325476;
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MD5_u32plus hi = 0;
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MD5_u32plus lo = 0;
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uint8_t buffer[64];
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MD5_u32plus block[16];
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public:
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struct MD5Result {
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std::array<uint8_t, 16> Bytes;
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operator std::array<uint8_t, 16>() const { return Bytes; }
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const uint8_t &operator[](size_t I) const { return Bytes[I]; }
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uint8_t &operator[](size_t I) { return Bytes[I]; }
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SmallString<32> digest() const;
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uint64_t low() const {
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// Our MD5 implementation returns the result in little endian, so the low
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// word is first.
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using namespace support;
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return endian::read<uint64_t, little, unaligned>(Bytes.data());
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}
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uint64_t high() const {
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using namespace support;
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return endian::read<uint64_t, little, unaligned>(Bytes.data() + 8);
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}
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std::pair<uint64_t, uint64_t> words() const {
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using namespace support;
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return std::make_pair(high(), low());
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}
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};
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MD5();
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/// \brief Updates the hash for the byte stream provided.
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void update(ArrayRef<uint8_t> Data);
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/// \brief Updates the hash for the StringRef provided.
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void update(StringRef Str);
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/// \brief Finishes off the hash and puts the result in result.
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void final(MD5Result &Result);
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/// \brief Translates the bytes in \p Res to a hex string that is
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/// deposited into \p Str. The result will be of length 32.
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static void stringifyResult(MD5Result &Result, SmallString<32> &Str);
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/// \brief Computes the hash for a given bytes.
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static std::array<uint8_t, 16> hash(ArrayRef<uint8_t> Data);
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private:
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const uint8_t *body(ArrayRef<uint8_t> Data);
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};
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inline bool operator==(const MD5::MD5Result &LHS, const MD5::MD5Result &RHS) {
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return LHS.Bytes == RHS.Bytes;
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}
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/// Helper to compute and return lower 64 bits of the given string's MD5 hash.
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inline uint64_t MD5Hash(StringRef Str) {
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using namespace support;
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MD5 Hash;
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Hash.update(Str);
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MD5::MD5Result Result;
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Hash.final(Result);
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// Return the least significant word.
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return Result.low();
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}
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} // end namespace llvm
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#endif // LLVM_SUPPORT_MD5_H
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