- Solidity Tutorial
- Solidity - Home
- Solidity - Overview
- Solidity - Environment Setup
- Solidity - Basic Syntax
- Solidity - First Application
- Solidity - Comments
- Solidity - Types
- Solidity - Variables
- Solidity - Variable Scope
- Solidity - Operators
- Solidity - Loops
- Solidity - Decision Making
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- Solidity - Structs
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- Solidity - Conversions
- Solidity - Ether Units
- Solidity - Special Variables
- Solidity - Style Guide
- Solidity Functions
- Solidity - Functions
- Solidity - Function Modifiers
- Solidity - View Functions
- Solidity - Pure Functions
- Solidity - Fallback Function
- Function Overloading
- Mathematical Functions
- Cryptographic Functions
- Solidity Common Patterns
- Solidity - Withdrawal Pattern
- Solidity - Restricted Access
- Solidity Advanced
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Solidity - Cryptographic Functions
Solidity provides inbuilt cryptographic functions as well. Following are important methods −
keccak256(bytes memory) returns (bytes32) − computes the Keccak-256 hash of the input.
ripemd160(bytes memory) returns (bytes20) − compute RIPEMD-160 hash of the input.
sha256(bytes memory) returns (bytes32) − computes the SHA-256 hash of the input.
ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address) − recover the address associated with the public key from elliptic curve signature or return zero on error. The function parameters correspond to ECDSA values of the signature: r - first 32 bytes of signature; s: second 32 bytes of signature; v: final 1 byte of signature. This method returns an address.
Following example shows the usage of cryptographic function in Solidity.
Example
pragma solidity ^0.5.0;
contract Test {
function callKeccak256() public pure returns(bytes32 result){
return keccak256("ABC");
}
}
Run the above program using steps provided in Solidity First Application chapter.
Output
0: bytes32: result 0xe1629b9dda060bb30c7908346f6af189c16773fa148d3366701fbaa35d54f3c8