value of crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX bigger than it should be

[rubiksdot]

I need to use pysodium.crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX.value in my code but I found that its value is not quite right.

The libsodium docs say it should be ~256GB and my reading of the libsodium code confirms but pysodium.crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX and pysodium.crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX.value both give me ~18.5EB which is a mite bigger than it should be.

I've got libsodium 1.0.18 (debian flavour) and pysodium 0.7.16 (pypi flavour). Another person confirmed with libsodium/pysodium 1.0.19 / 0.7.16 and a third with pysodium 0.7.16.

[stef]

thanks for reporting this bug! if you agree that 8d2c6d8 fixes it, please close this issue.

[rubiksdot]

Getting 274877906816 which appears right. Thank you for the fast fix. :)

[jedisct1]

As a side note, this is the maximum length of a single message (a call to _push()). So there are no practical limits.