Simon Wilkinson 07b3e6fd74 Allow zero-length encrypt IOVs in _krb5_evp_encrypt_iov_cts() ...

The iovec encryption code doesn't handle 0 length iovecs correctly.
Instead of just skipping them, _krb5_evp_encrypt_iov_cts() will spin
on the 0 length iovec.

Modify the _krb5_evp_iov_cursor_expand helper so that iovec expansion
simply skips 0 length iovecs, and make _krb5_evp_iov_cursor_nextcrypt
do the same.

Original bug report and tests from Andrew Bartlett <abartlet@samba.org>

2018-09-18 19:23:31 -04:00

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