What is the valid Keymaterial HIP needs to send.?

Please someone tell me whats the valid keymaterial one needs to send while encrypting data as HIP

From gateway side as HIU i,m receiving keyValue is of 65 bytes which is “BGrnDi5oknGc/NJ7xJM4Er6kkWegQDtqbKJwQpse+aYZBQqWAELGAJP5yj1v5pDcW678fZL8B8gCtlyc5XqQo4U=”
Now after generating a publickey using key pair i get following key and same is sent to HIU as keyValue
“MIIBMTCB6gYHKoZIzj0CATCB3gIBATArBgcqhkjOPQEBAiB/////////////////////////////////////////7TBEBCAqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqYSRShRAQge0Je0Je0Je0Je0Je0Je0Je0Je0Je0Je0JgtenHcQyGQEQQQqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq0kWiCuGaG4oIa04B7dLHdI0UySPU1+bXxhsinpxaJ+ztPZAiAQAAAAAAAAAAAAAAAAAAAAFN753qL3nNZYEmMaXPXT7QIBCANCAAR7z2KaKYKJsXv4LrF26JtLjTX+6DulXcMFnn/J0IiLaH0r3aP4yol92pyJjv4cnCQzhFWljhdjAxoCOPDd2Bzl”

then :
sharedKey is generating using above public key & privatekey
Till now encryption works fine

But while decrypting it gives me error while creating sharedKey at HIP side.
Because decryption has to be done with HIU’s keyValue and HIP’s keyValue right ?
Till now this is my 3rd query i have not got any response, previous queries:

Why it gives error ?

@mdubey