circuitpython/tests/extmod/uhashlib_final.py
Damien George 6a127810c0 extmod/moduhashlib: Put hash obj in final state after digest is called.
If digest is called then the hash object is put in a "final" state and
calling update() or digest() again will raise a ValueError (instead of
silently producing the wrong result).

See issue #4119.

Signed-off-by: Damien George <damien@micropython.org>
2021-05-26 21:44:46 +10:00

36 lines
855 B
Python

try:
import uhashlib
except ImportError:
print("SKIP")
raise SystemExit
for algo_name in ("md5", "sha1", "sha256"):
algo = getattr(uhashlib, algo_name, None)
if not algo:
continue
# Running .digest() several times in row is not supported.
h = algo(b"123")
h.digest()
try:
h.digest()
print("fail")
except ValueError:
# Expected path, don't print anything so test output is the
# same even if the algorithm is not implemented on the port.
pass
# Partial digests are not supported.
h = algo(b"123")
h.digest()
try:
h.update(b"456")
print("fail")
except ValueError:
# Expected path, don't print anything so test output is the
# same even if the algorithm is not implemented on the port.
pass
print("done")