CVE-2018-5382

The default BKS keystore use an HMAC that is only 16 bits long, which can
allow an attacker to compromise the integrity of a BKS keystore. Bouncy
Castle release 1.47 changes the BKS format to a format which uses a 160 bit
HMAC instead. This applies to any BKS keystore generated prior to BC 1.47.
For situations where people need to create the files for legacy reasons a
specific keystore type “BKS-V1” was introduced in 1.49. It should be noted
that the use of “BKS-V1” is discouraged by the library authors and should
only be used where it is otherwise safe to do so, as in where the use of a
16 bit checksum for the file integrity check is not going to cause a
security issue in itself.

Notes