6/19/2023 0 Comments Gas to hash calculatorNeither the RLP encoding of all fields of a transaction is given nor an RLP encode instruction in the EVM instruction set, but it is possible to calculate it ( Yellow Paper, Appendix B), provided that the sender has enough gas at its disposal.įinally, there aren't instruction to access all fields. Access/Calculate an RLP encoding of a transactionīy looking the EVM specification ( Yellow Paper, Appendix H), you can see that the first point is very easy, indeed it corresponds to the SHA3 (0x20) instruction.Calculate the KEC256 bit hash of an arbitrary number of bytes.Therefore in order to calculate the transaction function, you need to be able to: So your problem can unfortunately not be solved.ĭo the contracts of ethereum have the access to the nonce of the blocks?Īccording to geth source code (file core/types/transactions) and this medium post the hash of a transaction is given by the keccak 256-bit hashing of the rlp encoding of all fields of a transaction, as showed in this image 1. This online String hash tool generates the hash values for the given strings using different hashing algorithms. Values 1, 7, 8, and 9 (the nonce and the signature values) are not available using solidity, nor are they available using assembly code (which can be written inline in solidity source code files). Online Hash Calculator for Strings using Different Algorithms. Value 3 is not directly available but you can get the current remaining gas at any point in your code execution and calculate from this, how much was available once the execution started. The constituents of signedTransaction are So you would need to construct signedTransaction since this value is not exposed to solidity, cf. This keccak256 function is available as a solidity function The txhash is keccak256(signedTransaction).
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