| //==- 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 "llvm/ADT/ArrayRef.h" |
| #include "llvm/ADT/StringRef.h" |
| |
| #include <array> |
| #include <cstdint> |
| |
| namespace llvm { |
| template <typename T> class ArrayRef; |
| |
| /// 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 |