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25f21c103f
812037cb80f72096738cf2b0c15b39536c6c1e24 Change CSipHasher's count variable to uint8_t (Pieter Wuille) Pull request description: SipHash technically supports arbitrarily long inputs (at least, I couldn't find a limit in the [paper](https://eprint.iacr.org/2012/351.pdf)), but only the low 8 bits of the length matter. Because of that we should use an unsigned type to track the length (as any signed type could overflow, which is UB). `uint8_t` is sufficient, however. Fixes #19930. ACKs for top commit: laanwj: anyhow re-ACK 812037cb80f72096738cf2b0c15b39536c6c1e24 elichai: utACK 812037cb80f72096738cf2b0c15b39536c6c1e24 practicalswift: ACK 812037cb80f72096738cf2b0c15b39536c6c1e24 theStack: ACK 812037cb80f72096738cf2b0c15b39536c6c1e24 Tree-SHA512: 5b1440c9e4591460da198991fb421ad47d2d96def2014e761726ce361aa9575752f2c4085656e7e9badee3660ff005cc76fbd1afe4848faefe4502f3412bd896
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// Copyright (c) 2016-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_CRYPTO_SIPHASH_H
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#define BITCOIN_CRYPTO_SIPHASH_H
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#include <stdint.h>
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#include <uint256.h>
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/** SipHash-2-4 */
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class CSipHasher
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{
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private:
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uint64_t v[4];
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uint64_t tmp;
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uint8_t count; // Only the low 8 bits of the input size matter.
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public:
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/** Construct a SipHash calculator initialized with 128-bit key (k0, k1) */
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CSipHasher(uint64_t k0, uint64_t k1);
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/** Hash a 64-bit integer worth of data
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* It is treated as if this was the little-endian interpretation of 8 bytes.
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* This function can only be used when a multiple of 8 bytes have been written so far.
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*/
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CSipHasher& Write(uint64_t data);
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/** Hash arbitrary bytes. */
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CSipHasher& Write(const unsigned char* data, size_t size);
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/** Compute the 64-bit SipHash-2-4 of the data written so far. The object remains untouched. */
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uint64_t Finalize() const;
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};
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/** Optimized SipHash-2-4 implementation for uint256.
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*
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* It is identical to:
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* SipHasher(k0, k1)
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* .Write(val.GetUint64(0))
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* .Write(val.GetUint64(1))
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* .Write(val.GetUint64(2))
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* .Write(val.GetUint64(3))
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* .Finalize()
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*/
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uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val);
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uint64_t SipHashUint256Extra(uint64_t k0, uint64_t k1, const uint256& val, uint32_t extra);
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#endif // BITCOIN_CRYPTO_SIPHASH_H
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