Function TaggedHash

test/functional/test_framework/key.py:18–22

(tag, data)

from .util import modinv

def TaggedHash(tag, data):
    ss = hashlib.sha256(tag.encode('utf-8')).digest()
    ss += ss
    ss += data
    return hashlib.sha256(ss).digest()

def jacobi_symbol(n, k):
    """Compute the Jacobi symbol of n modulo k