Implement OP_CHECKSIG

In Bitcoin script, OP_CHECKSIG verifies a digital signature against a public key and a message hash. It's a crucial operation for validating transactions.

Task

Complete the OP_CHECKSIG function in challenges/OpcodeFunctions.js:

  1. Implement OP_CHECKSIG to verify a signature against a public key and a message hash.
  2. The function should pop the top two items from the stack: the public key and the signature.
  3. It should then prompt the user for a message hash.
  4. Finally, it should push true (0x01) or false (0x00) onto the stack based on the signature verification result.

Implementation

Hints

Click to reveal next hint (0/4)
  • Use the elliptic library's EC class for signature verification
  • Remember to handle the DER-encoded signature format
  • The public key should be in compressed or uncompressed format
  • Ensure proper error handling for invalid inputs or verification failures

Solution

Solution Code

Test your implementation using the Bitcoin OP_CHECKSIG Simulator above. Try various inputs to ensure your opcode handles different scenarios correctly.

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