This patch provides routines that can be shared between

https://pagure.io/dogtagpki/issue/2605 CMC feature: id-cmc-identityProofV2 per rfc5272

and

https://pagure.io/dogtagpki/issue/2604 RFE: shared secret storage and retrieval mechanism

Note: symkey algorithm remains at DES3 until cmc feature materializes.

thanks,

Christina