mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
e33d058f16
In many sitautions, you just want to compute a hash for one chunk of data. This patch adds convenient functions for that purpose. Differential Revision: https://reviews.llvm.org/D26988 llvm-svn: 287726
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
//==- SHA1.h - SHA1 implementation for LLVM --*- C++ -*-==//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
// This code is taken from public domain
|
|
// (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c)
|
|
// and modified by wrapping it in a C++ interface for LLVM,
|
|
// and removing unnecessary code.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_SHA1_H
|
|
#define LLVM_SUPPORT_SHA1_H
|
|
|
|
#include "llvm/ADT/ArrayRef.h"
|
|
|
|
#include <array>
|
|
#include <cstdint>
|
|
|
|
namespace llvm {
|
|
template <typename T> class ArrayRef;
|
|
class StringRef;
|
|
|
|
/// A class that wrap the SHA1 algorithm.
|
|
class SHA1 {
|
|
public:
|
|
SHA1() { init(); }
|
|
|
|
/// Reinitialize the internal state
|
|
void init();
|
|
|
|
/// Digest more data.
|
|
void update(ArrayRef<uint8_t> Data);
|
|
|
|
/// Digest more data.
|
|
void update(StringRef Str) {
|
|
update(ArrayRef<uint8_t>((uint8_t *)const_cast<char *>(Str.data()),
|
|
Str.size()));
|
|
}
|
|
|
|
/// Return a reference to the current raw 160-bits SHA1 for the digested data
|
|
/// since the last call to init(). This call will add data to the internal
|
|
/// state and as such is not suited for getting an intermediate result
|
|
/// (see result()).
|
|
StringRef final();
|
|
|
|
/// Return a reference to the current raw 160-bits SHA1 for the digested data
|
|
/// since the last call to init(). This is suitable for getting the SHA1 at
|
|
/// any time without invalidating the internal state so that more calls can be
|
|
/// made into update.
|
|
StringRef result();
|
|
|
|
/// Returns a raw 160-bit SHA1 hash for the given data.
|
|
static std::array<uint8_t, 20> hash(ArrayRef<uint8_t> Data);
|
|
|
|
private:
|
|
/// Define some constants.
|
|
/// "static constexpr" would be cleaner but MSVC does not support it yet.
|
|
enum { BLOCK_LENGTH = 64 };
|
|
enum { HASH_LENGTH = 20 };
|
|
|
|
// Internal State
|
|
struct {
|
|
union {
|
|
uint8_t C[BLOCK_LENGTH];
|
|
uint32_t L[BLOCK_LENGTH / 4];
|
|
} Buffer;
|
|
uint32_t State[HASH_LENGTH / 4];
|
|
uint32_t ByteCount;
|
|
uint8_t BufferOffset;
|
|
} InternalState;
|
|
|
|
// Internal copy of the hash, populated and accessed on calls to result()
|
|
uint32_t HashResult[HASH_LENGTH / 4];
|
|
|
|
// Helper
|
|
void writebyte(uint8_t data);
|
|
void hashBlock();
|
|
void addUncounted(uint8_t data);
|
|
void pad();
|
|
};
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|