Viewing file:  SHA1.h (2.32 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
//==- SHA1.h - SHA1 implementation for LLVM --*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// 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 <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);
/// Return 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()).
std::array<uint8_t, 20> final();
/// Return 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.
std::array<uint8_t, 20> 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;
// Helper
void writebyte(uint8_t data);
void hashBlock();
void addUncounted(uint8_t data);
void pad();
void final(std::array<uint32_t, HASH_LENGTH / 4> &HashResult);
};
} // end llvm namespace
#endif
|