[krbdev.mit.edu #8228] git commit

[Greg Hudson via RT]

Add krb5_c_prfplus() and krb5_c_derive_prfplus()

This commit permits the external use of the RFC 6113 PRF+ function.
It also adds a function to derive a key from an input key and string
using PRF+.

[ghudson at mit.edu: adjust style; avoid new C99isms; use string2data(),
empty_data(), and alloc_data() where appropriate; add some explanatory
comments; edit docstrings and commit message]

https://github.com/krb5/krb5/commit/35f288092f0df7f4aca92e1f51db3611a3b32ada
Author: Nathaniel McCallum <npmccallum at redhat.com>
Committer: Greg Hudson <ghudson at mit.edu>
Commit: 35f288092f0df7f4aca92e1f51db3611a3b32ada
Branch: master
 doc/appdev/refs/api/index.rst      |    2 +
 src/include/krb5/krb5.hin          |   42 +++++++
 src/lib/crypto/krb/cf2.c           |  209 ++++++++++++++++++++---------------
 src/lib/crypto/libk5crypto.exports |    2 +
 src/lib/krb5_32.def                |    2 +
 5 files changed, 167 insertions(+), 90 deletions(-)