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Cryptography Builtins

Coco provides built-in cryptographic functions for hashing and signature verification.

Hash Functions​

FunctionDescription
Builtins.Sha256(data)SHA-256 hash → U256
Builtins.Keccak(data)Keccak-256 hash → U256
Builtins.Blake2b(data)Blake2b hash → U256

Signature Verification​

FunctionDescription
Builtins.Sigverify(data, signature, pubkey)Verify signature → Bool

Verifies that data was signed by the private key corresponding to pubkey.

Example​

coco HashExample

endpoint pure ComputeHash(data Bytes) -> (hash U256):
    hash = Builtins.Sha256(data)

endpoint pure VerifySignature(
    data Bytes,
    signature Bytes,
    pubkey Bytes
) -> (valid Bool):
    valid = Builtins.Sigverify(data, signature: signature, pubkey: pubkey)