#!/bin/bash
# Helper script for secp256k1 signing using pure shell commands

PRIVATE_KEY_FILE="$1"
MESSAGE_HASH_FILE="$2"

# Load private key and message hash
PRIVATE_KEY=$(cat "$PRIVATE_KEY_FILE" | xxd -p -c 64)
MESSAGE_HASH=$(cat "$MESSAGE_HASH_FILE" | xxd -p -c 32)

# Use secp256k1 library through Python (as a last resort)
python3 -c "
from coincurve import PrivateKey
private_key = PrivateKey(bytes.fromhex('$PRIVATE_KEY'))
signature = private_key.sign(bytes.fromhex('$MESSAGE_HASH'), hasher=None)
print(signature.hex())
" | xxd -r -p | base64 -w 0 | tr '/+' '_-' | tr -d '='