1 //==- SHA1.h - SHA1 implementation for LLVM --*- C++ -*-==//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
8 // This code is taken from public domain
9 // (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c)
10 // and modified by wrapping it in a C++ interface for LLVM,
11 // and removing unnecessary code.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_SUPPORT_SHA1_H
16 #define LLVM_SUPPORT_SHA1_H
22 template <typename T> class ArrayRef;
25 /// A class that wrap the SHA1 algorithm.
30 /// Reinitialize the internal state
34 void update(ArrayRef<uint8_t> Data);
37 void update(StringRef Str);
39 /// Return a reference to the current raw 160-bits SHA1 for the digested data
40 /// since the last call to init(). This call will add data to the internal
41 /// state and as such is not suited for getting an intermediate result
45 /// Return a reference to the current raw 160-bits SHA1 for the digested data
46 /// since the last call to init(). This is suitable for getting the SHA1 at
47 /// any time without invalidating the internal state so that more calls can be
51 /// Returns a raw 160-bit SHA1 hash for the given data.
52 static std::array<uint8_t, 20> hash(ArrayRef<uint8_t> Data);
55 /// Define some constants.
56 /// "static constexpr" would be cleaner but MSVC does not support it yet.
57 enum { BLOCK_LENGTH = 64 };
58 enum { HASH_LENGTH = 20 };
63 uint8_t C[BLOCK_LENGTH];
64 uint32_t L[BLOCK_LENGTH / 4];
66 uint32_t State[HASH_LENGTH / 4];
71 // Internal copy of the hash, populated and accessed on calls to result()
72 uint32_t HashResult[HASH_LENGTH / 4];
75 void writebyte(uint8_t data);
77 void addUncounted(uint8_t data);
81 } // end llvm namespace