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import hashlib
try:
# this will work with micropython and python < 3.10
# but will raise and exception if ripemd is not supported (python3.10, openssl 3)
hashlib.new("ripemd160")
def ripemd160(msg: bytes) -> bytes:
return hashlib.new("ripemd160", msg).digest()
except:
# otherwise use pure python implementation
from .util.py_ripemd160 import ripemd160
def double_sha256(msg: bytes) -> bytes:
"""sha256(sha256(msg)) -> bytes"""
return hashlib.sha256(hashlib.sha256(msg).digest()).digest()
def hash160(msg: bytes) -> bytes:
"""ripemd160(sha256(msg)) -> bytes"""
return ripemd160(hashlib.sha256(msg).digest())
def sha256(msg: bytes) -> bytes:
"""one-line sha256(msg) -> bytes"""
return hashlib.sha256(msg).digest()
def tagged_hash(tag: str, data: bytes) -> bytes:
"""BIP-Schnorr tag-specific key derivation"""
hashtag = hashlib.sha256(tag.encode()).digest()
return hashlib.sha256(hashtag + hashtag + data).digest()
def tagged_hash_init(tag: str, data: bytes = b""):
"""Prepares a tagged hash function to digest extra data"""
hashtag = hashlib.sha256(tag.encode()).digest()
h = hashlib.sha256(hashtag + hashtag + data)
return h
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