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Ethereum: Why does Bitcoin Core print SHA256 hashes (uint256) bytes in reverse order?
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- دسته بندی ها : CRYPTOCURRENCY
Ethereum’s SHA -256 Challenge Understanding and Challenges Error Correct
As a developer with the Bitcoin core, one of the most common topics is the printing of the Sha-256 jams in the opposite order. This phenomenon has led to frustration among developers, especially during functional testing. This article discusses why Bitcoin Core prints Sha-256 seals in reverse order and explores ways to solve this problem.
Sha-256 Role
The Sha-256 (protected hash-algorithm 256) is a encryption technology function designed to produce a solid size, unique digital fingerprints for feed information. These fingerprints are created by taking a message as a feed, the application of the Sha-256 algorithm, and the 256-bit (64 byte) departure. In the Bitcoin core, the Etash command uses this Hash function to create Blockchain Merkle and other encryption structures.
Why Sha-256 Hashes prints in reverse order
When the syllables are turned to the UINT256 Hash strings using the configurator of theprintf form, the syllables are turned due to a string printing. Particularly:
%Uformator uses a two -digit un signed integer to represent the value.
- When you print an undeclared integer using
%U, the most significant syllable (MSB) is first to be the least significant byte (LSB).
- At the
Uint256event, each syllable represents an 8 -bit signable integer.
- By default, when converting the
UINT256values into a Bitcoin core string, the output has been turned due to this order.
functional test challenges
The inverse output can lead to confusion during functional testing. For example:
- When comparing two hashs using the
esh blood, ', comparison may fail if Hash values are not printed in the same order.
- In certain tests, turning can affect the anticipated behavior of encryption functions used by the block chain.
Solving the problem
To solve this problem, you can use a few rotation methods:
- Print Bulls Hexadecimal Vehicles : Useprintf
%X%Uto print as hexadecimal. This ensures that the departure is not turned.
Bash
Echo “0x1234567890ABCDEF” | printf “%x”
`
2 For example, you can use %08x products to print hashs as an 8 -digit hexadecimal.
`Bash
Echo “0x1234567890ABCDEF” | printf “%08x”
`
- Use the
Printfcommand with a specific separator : You can set a custom separator between the values’ -toption with theprintfoption. For example:
Bash
EASH print -t, -Stout “0x1234567890ABCDEF” | …
`
By implementing these rotation or adaptations, you should be able to solve the problem in printing the Sha-256 challenges in a reverse order in the Bitcoin core and to ensure that functional tests are accurate.