tree 88217a5facdb55417e166b7b09caf97e78a3003f
parent ec4aaab39afcec749ff7ed78e560213ff9e1c23c
author Chuck Lever <chuck.lever@oracle.com> 1673803344 -0500
committer Chuck Lever <chuck.lever@oracle.com> 1676902842 -0500

SUNRPC: Parametrize the key length passed to context_v2_alloc_cipher()

Although the Kerberos specs have always listed separate subkey
lengths, the Linux kernel's SunRPC GSS Kerberos enctype profiles
assume the base key and the derived keys have identical lengths.

The aes256-cts-hmac-sha384-192 enctype specifies the length of its
checksum and integrity subkeys as 192 bits, but the length of its
encryption subkey (Ke) as 256 bits.

To support that enctype, parametrize context_v2_alloc_cipher() so
that each of its call sites can pass in its desired key length. For
now it will be the same length as before (gk5e->keylength), but a
subsequent patch will change this.

Tested-by: Scott Mayhew <smayhew@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>