The description of the BBM Enterprise key exchange uses the following labels:

Parameter	Description
A, B	The two key exchange participants (A initiator, B recipient)
XA, XB	Versions of X belonging to A and B
PINAB	BlackBerry PIN value for A and B
VersionAB	The highest supported protocol version by each party
SAB	Public portion of EC-SPEKE exchange values
S'AB	Private portion of EC-SPEKE exchange values
KsignAB	Public portion of signing key
K'signAB	Private portion of signing key
KencAB	Public portion of encryption key
K'encAB	Private portion of encryption key
Kenc	Symmetric encryption key protecting the confidentiality of the key exchange
Kmac	Symmetric key protecting the integrity of the key exchange
nonce	Initialization Vector nonce associated with encryption using Kenc
ENCMAC {Kenc, Kmac, IV} (data)	Symmetric encryption with Kenc followed by the addition of a MAC of the ciphertext with Kmac
DECMAC {Kenc, Kmac, IV} (data)	The inverse of ENCMAC: verification of the MAC with Kmac, followed by decryption of the authenticated ciphertext using Kenc
KDF (aux, secret)	A standard KDF function
EC-SPEKE-GEN (secret)	Generates a non-deterministic key pair based on a shared secret
EC-DH (private, public)	Generates a raw shared secret with ECDH
EC-GEN ()	Generates a new random Elliptic Curve key pair
Kproof	A symmetric key used for proving possession of the private key
EC-SIGN {secret} (data)	A public key signature on a hash using ECDSA
MAC {secret} (data)	Calculates a MAC keyed with secret on data
T3, T4	Message authentication tags for messages #3 and #4
SSAB	The EC-SPEKE shared secret value between A and B
F	The prefix value used for cryptographic separation between usages of the same key between different BBM applications, protocol versions, and sessions
S	Shared secrets, shared in-band out-of-band (for details, see Key exchange process)
||	Indicates concatenation
(X, Y)	Indicates separation of concatenated values