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Test chapoly decryption too

This commit is contained in:
Juhani Krekelä 2020-06-25 11:26:14 +03:00
parent 498d6f1219
commit a1a314ba95
2 changed files with 6 additions and 4 deletions
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5
compact_chapoly.py
View File

@ -1,3 +1,4 @@
import secrets
u=lambda b:sum(b[i]<<(i*8)for i in range(len(b)))
unu=lambda n,l:bytes(n>>i&255 for i in range(0,l,8))
add=lambda x,y:x+y&0xffffffff
@ -21,5 +22,5 @@ tag=lambda a,k,n,c:poly1305(b''.join((a,p16(a),c,p16(c),unu(len(a),64),unu(len(c
def enc(a,k,n,p):c=bytes(chacha20(k,1,n,p));return c+tag(a,k,n,c)
def dec(a,k,n,e):
c=e[:-16]
if not secrets.compare_digest(e[-16:],tag(a,k,f+i,c)):return None
return bytes(chacha20(k,1,f+i,c))
if not secrets.compare_digest(e[-16:],tag(a,k,n,c)):return None
return bytes(chacha20(k,1,n,c))

5
test.py
View File

@ -1,7 +1,7 @@
import secrets
import compact_chapoly
def compare_chacha20():
def test_chacha20_poly1305():
test_vectors = [
('808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f', '070000004041424344454647', '4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e', '50515253c0c1c2c3c4c5c6c7', 'd31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116', '1ae10b594f09e26a7e902ecbd0600691'),
('1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0', '000000000102030405060708', '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', 'f33388860000000000004e91', '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', 'eead9d67890cbb22392336fea1851f38'),
@ -12,7 +12,8 @@ def compare_chacha20():
for test_vector in test_vectors:
key, nonce, plaintext, ad, ciphertext, tag = map(bytes.fromhex, test_vector)
assert compact_chapoly.enc(ad, key, nonce, plaintext) == ciphertext + tag
assert compact_chapoly.dec(ad, key, nonce, ciphertext + tag) == plaintext
print('Ok')
if __name__ == '__main__':
compare_chacha20()
test_chacha20_poly1305()