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Questions tagged [rlp]

The purpose of RLP (Recursive Length Prefix) is to encode arbitrarily nested arrays of binary data, and RLP is the main encoding method used to serialize objects in Ethereum.

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what type of encoding is used by the abi specification in solidity

the abi specification of solidity which provides functions like abi.encodePacked() using a certain type of encoding (eg: for functions, a 4 byte function signature hash followed by encoding of ...
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1answer
79 views

geth inter-node communication (devp2p/rlpx) encryption

I am currently analysing the encryption mechanisms used in geth. Currently I have gathered the following information from the source code (https://github.com/ethereum/go-ethereum/blob/master/p2p/rlpx....
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Recovered Sender Address from Raw Transaction

I'm trying this code example : https://thomasclowes.com/verifying-an-ethereum-signature-on-the-server-php-2/ Expected $recoveredSenderAddress = 0xd5bfc359c3a377bb8afd41db8ffc8d1349718233 Actual $...
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1answer
72 views

Rlp vs rlpx: the specified difference between rlp and rlpx?

Rlp vs rlpx - the specified difference between rlp and rlpx?
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104 views

Protocol buffers (protobuf) vs rlp serialization - performance improvement

Assume Protocol buffers (protobuf) was used in place of rlp/rlpx, will performance improve considerably?
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23 views

use ecdsa to sign rlp to get rawTransaction

f864 01 850 4a817c800 82 5208 94 e0defb92145fef3c3a945637705fafd3aa74a241 01 nonce gasPrice gaslimit toAddress balance this is my tx. before i ...
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1answer
141 views

Broadcast error rlp: non-canonical integer (leading zero bytes) for uint64

Here's a transaction to broadcast: ...
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1answer
92 views

How does Ethereum differentiate between 0x0 and null during contract creation?

According to the EVM documentation, all values are initialized. This means to will contain the 0 address, as null is not a recognized state. The 0 address links to an external account (which we all ...
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Hex Prefix Ethereum - Yellow Paper

I am trying to understand what is Hex Prefix as specified in the Yellow Paper(Appendix C), I don't see a similar reference in the whitepaper, but thank's to this awesome medium post I think I got it, ...
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What does “RlpInvalidIndirection” error mean?

I run my own Parity node for Ropsten network. I am sending raw transactions to the node with "eth_sendRawTransaction" api, and sometimes it returns {-32602, "Invalid RLP.", "RlpInvalidIndirection"} ...
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1answer
121 views

Correct way to deterministically compute contract address in Python

To begin with, I have already gone through the approach outlined in the following thread: How is the address of an Ethereum contract computed? I wanted to test if the approach actually works. On my ...
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1answer
61 views

Why a length-1024 string of RLP encoding is \xb9\x04\x00?

In the Ethereum wiki RLP page, If a string is more than 55 bytes long, the RLP encoding consists of a single byte with value 0xb7 plus the length in bytes of the length of the string in binary form,...
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What's sharing through P2P ethereum network?

I'm a new user of ethereum. I didn't succeed to understand exactly which fields or states are shared through the P2P network in ethereum. I mean, is each execution's step of the EVM shared, or just ...
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145 views

How to sign a simple transfer TX with digitalbitbox python api

I'm trying to sign a simple transfer transaction using digitalbitbox's python api (see here and code snippet below). I send the following json to the HW wallet api: Sending: {"sign":{"data":[{"...
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2answers
558 views

How to RLP-encode messages in Solidity

I'm trying to figure out how to interact with the current version of the Casper contract from Solidity. The vote-function in the casper contract takes an array of bytes, which represents the RLP-...
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1answer
122 views

RLP Rationale Question

I am trying to understand why RLP was chosen and developed as an in-house protocol.I stumbled up this link which provides some insights: https://github.com/ethereum/wiki/wiki/Design-Rationale Trying ...
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1answer
186 views

How long can a string be until it spills into the next word?

string is dynamic length storage. I imagine a string of length (bytes length) 1, 2 or 3 is all the same length on storage, probably one word. Which byte causes it to spill over into a second, third ...
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1answer
260 views

RLP decoding question

I am trying to understand what this means from the RLP white paper wiki "The only purpose of RLP is to encode structure; encoding specific data types (eg. strings, floats) is left up to higher-order ...
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1answer
312 views

Ethereum network messaging

I am trying to "join the dots" around the networking aspect of Ethereum. From the documents, it seems, the underlying protocol is RLPx that powers the ÐΞVp2p Wire Protocol. Though TCP provides a ...
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2answers
579 views

RLP ethereum decoding

Hi! I have some data, like this ( 827ab7 ), encoding RLP. How I can to know, what is it (string, list or int)?
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1answer
147 views

What is the shared nibble of this extension node?

I have an extension node here: Key: 000b17906abb9f83c5e190bc3d0bed212e66bf44d99997c53c2071e1413194b6 Value: [ 3866a6d45a815576000da23c1a017179233e9d6437806aef7c2264588739d0, ...
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1answer
180 views

How Merkle Tree obtain root node hash (example from 'Understanding the ethereum trie')?

I read Understanding the ethereum trie and try to do examples from that article. Now i am at ex1.py - first exaple. Look at code from that example: import sys sys.path.append('src') import trie, ...
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1answer
614 views

Block header format

Does anyone understand what each element of a block header represents? I have an example block header represented here: [ cd7bd64fba4cc782fe5474d3640882afece5887180591e72f80ce6916cf73526, ...
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1answer
111 views

Confusion over RLP encoding for byte array > 55 bytes

I am reading through the wiki on RLP (https://github.com/ethereum/wiki/wiki/RLP) and think I am missing something fundamental. For byte arrays (not lists) greater than 55 bytes, the RLP encoding is ...
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1answer
290 views

Does RLP specify integer encoding?

The RLP specification says the following about integers: The only purpose of RLP is to encode structure; encoding specific atomic data types (eg. strings, ints, floats) is left up to higher-order ...
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2answers
2k views

LevelDB in Geth, key and values

When parsing through the levelDB or RocksDB (Depending on the client you are using) there are string values representing the key and the value. These are both stored as Byte arrays as well. My ...
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1answer
93 views

binary encoding of nonce 0

Although probably not an issue in practice, I'm confused how nonce of zero is encoded in transactions. According to RLP doc, \x00 should be encoded as \x00. But the source code of pyethereum shows ...
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1answer
1k views

Why was RLP chosen as the low level protocol encoding algorithm?

Is this an ad-hoc decision? Why RLP? Is it specifically suited to something?
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1answer
449 views

Invalid transaction v,r,s values with geth when reading from of signed MEW RLP transaction

I generated a signed transaction with myEtherWallet: ...
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1answer
86 views

Can I add leading zeroes at will when building an RLP-encoded transaction?

Suppose I'm building a transaction such as: const raw = [ new Buffer("0001", "hex"), new Buffer("23000000000", "hex"), new Buffer("21000", "hex"), new Buffer("0x00000000000000000000"),...
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1answer
97 views

What does string mean in patricia tree wiki

What does string mean in patricia tree wiki specifically here Merkle Patricia trees provide a cryptographically authenticated data structure that can be used to store all (key, value) bindings, ...
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0answers
179 views

Simple hello packet

I am trying to generate a simple hello packet for handshaking with a remote Ethereum client using the encode method from the rlp library. from rlp import encode hello = bytearray(encode([0x00, 4, "...
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2answers
276 views

RLP encoding of 0

According to the docs here, For a single byte whose value is in the [0x00, 0x7f] range, that byte is its own RLP encoding I ran the following using pyrlp (similar to the code in pyethereum here):...
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2answers
2k views

Clarification of “256 bit word” semantics

EVM has "256bit words". Some cases treat strings shorter than 32 bytes (256 bits) as left-justified ascii (packed into the most significant bytes of the word). Does this mean that the word value of ...