Check for leading zeros in CBS_get_asn1_uint64.

The encoding of an INTEGER should not have leading zeros, except to pad for the
sign bit.

Change-Id: I80d22818cf1d2ca9d27e215620392e1725372aa5
Reviewed-on: https://boringssl-review.googlesource.com/4218
Reviewed-by: Adam Langley <agl@google.com>
2 files changed