Cryptographic Functions

Cryptographic Function refers to cryptographic functions that are supported from execution runtime so that gas cost can be reduced by avoiding implementation inside a contract. Moreover, It helps in providing complicated calculations which are not feasible in the Wasmer environment (e.g. encryption, hashing).

Please be noted that some functions are selected based on the popularity of the blockchain ecosystem, but are not necessary adopted in the implementation of the ParallelChain Mainnet node.

Function	Description	Gas Cost
sha256	SHA256 hash function	16 x length of the input
keccak256	Keccak-256 hash function	16 x length of the input
ripemd	RIPEMD-160 hash function	16 x length of the input
verify_ed25519_signature	Verification on ed25519 signature	1,400,000 + 16 x length of the input

The gas consumption is estimated by the compute costs for precompile functions used by developers to deploy smart contracts on ParallelChain Mainnet.

Related APIs in pchain_sdk::crypto:

/// Computes the SHA256 digest (32 bytes) of arbitrary input.
fn sha256(input: Vec<u8>) -> Vec<u8>;
/// Computes the Keccak256 digest (32 bytes) of arbitrary input.
fn keccak256(input: Vec<u8>) -> Vec<u8>;
/// Computes the RIPEMD160 digest (20 bytes) of arbitrary input.
fn ripemd(input: Vec<u8>) -> Vec<u8>;
/// Returns whether an Ed25519 signature was produced by a specified by a specified address over some specified message.
/// Contract call fails if the input `address` or `signature` is not valid.
fn verify_ed25519_signature(input: Vec<u8>, signature: Vec<u8>, address: Vec<u8>) -> bool;