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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //==- SHA1.h - SHA1 implementation for LLVM --*- C++ -*-==// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // This code is taken from public domain |
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| 9 | // (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c) |
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| 10 | // and modified by wrapping it in a C++ interface for LLVM, |
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| 11 | // and removing unnecessary code. |
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| 12 | // |
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| 13 | //===----------------------------------------------------------------------===// |
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| 14 | |||
| 15 | #ifndef LLVM_SUPPORT_SHA1_H |
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| 16 | #define LLVM_SUPPORT_SHA1_H |
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| 17 | |||
| 18 | #include <array> |
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| 19 | #include <cstdint> |
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| 20 | |||
| 21 | namespace llvm { |
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| 22 | template <typename T> class ArrayRef; |
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| 23 | class StringRef; |
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| 24 | |||
| 25 | /// A class that wrap the SHA1 algorithm. |
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| 26 | class SHA1 { |
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| 27 | public: |
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| 28 | SHA1() { init(); } |
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| 29 | |||
| 30 | /// Reinitialize the internal state |
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| 31 | void init(); |
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| 32 | |||
| 33 | /// Digest more data. |
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| 34 | void update(ArrayRef<uint8_t> Data); |
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| 35 | |||
| 36 | /// Digest more data. |
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| 37 | void update(StringRef Str); |
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| 38 | |||
| 39 | /// Return the current raw 160-bits SHA1 for the digested data |
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| 40 | /// since the last call to init(). This call will add data to the internal |
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| 41 | /// state and as such is not suited for getting an intermediate result |
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| 42 | /// (see result()). |
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| 43 | std::array<uint8_t, 20> final(); |
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| 44 | |||
| 45 | /// Return the current raw 160-bits SHA1 for the digested data |
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| 46 | /// since the last call to init(). This is suitable for getting the SHA1 at |
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| 47 | /// any time without invalidating the internal state so that more calls can be |
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| 48 | /// made into update. |
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| 49 | std::array<uint8_t, 20> result(); |
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| 50 | |||
| 51 | /// Returns a raw 160-bit SHA1 hash for the given data. |
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| 52 | static std::array<uint8_t, 20> hash(ArrayRef<uint8_t> Data); |
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| 53 | |||
| 54 | private: |
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| 55 | /// Define some constants. |
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| 56 | /// "static constexpr" would be cleaner but MSVC does not support it yet. |
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| 57 | enum { BLOCK_LENGTH = 64 }; |
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| 58 | enum { HASH_LENGTH = 20 }; |
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| 59 | |||
| 60 | // Internal State |
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| 61 | struct { |
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| 62 | union { |
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| 63 | uint8_t C[BLOCK_LENGTH]; |
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| 64 | uint32_t L[BLOCK_LENGTH / 4]; |
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| 65 | } Buffer; |
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| 66 | uint32_t State[HASH_LENGTH / 4]; |
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| 67 | uint32_t ByteCount; |
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| 68 | uint8_t BufferOffset; |
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| 69 | } InternalState; |
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| 70 | |||
| 71 | // Helper |
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| 72 | void writebyte(uint8_t data); |
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| 73 | void hashBlock(); |
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| 74 | void addUncounted(uint8_t data); |
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| 75 | void pad(); |
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| 76 | |||
| 77 | void final(std::array<uint32_t, HASH_LENGTH / 4> &HashResult); |
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| 78 | }; |
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| 79 | |||
| 80 | } // end llvm namespace |
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| 81 | |||
| 82 | #endif |