Module ocs_eap_aka

Description
Function Index
Function Details

This library module implements functions for EAP authentication using 3GPP Authentication and Key Agreement (AKA) in the ocs application.

Copyright © 2019 - 2026 SigScale Global Inc.

References

RFC4187 - EAP Method for 3GPP AKA (EAP-AKA)

Description

This library module implements functions for EAP authentication using 3GPP Authentication and Key Agreement (AKA) in the ocs application.

Function Index

prf/1	Pseudo-Random number Function (PRF).
g/1*	Calculate message digest.
compressed_imsi/1	Compress or decompress an IMSI.
encrypt_imsi/3	Create an encrypted temporary identity.
decrypt_imsi/2	Decrypt a temporary identity.
encrypt_key/4	Encrypt the Pairwise Master Key (PMK) according to RFC2548 section 2.4.2 for use as String in a MS-MPPE-Recv-Key or MS-MPPE-Send-Key attribute.

Function Details

prf/1

prf(MK) -> Result

MK = binary()
Result = binary()

Pseudo-Random number Function (PRF).

Generates a digest indistinguisable from random as described in RFC4187 section 7.

g/1 *

g(XKEY) -> Digest

XKEY = binary()
Digest = binary()

Calculate message digest.

A modified SHA-1 as described in RFC4187 section 7.

compressed_imsi/1

compressed_imsi(IMSI) -> IMSI

IMSI = binary()

Compress or decompress an IMSI.

See 3GPP 33.402 14.1 Temporary identity generation.

encrypt_imsi/3

encrypt_imsi(Tag, CompressedIMSI, Key) -> Pseudonym

Tag = 50 | 55
CompressedIMSI = binary()
Key = {N, Kpseu}
N = pos_integer()
Kpseu = binary()
Pseudonym = binary()

Create an encrypted temporary identity.

See 3GPP 33.402 14.1 Temporary identity generation.

decrypt_imsi/2

decrypt_imsi(Pseudonym, Keys) -> CompressedIMSI

Pseudonym = binary()
Keys = [Key]
Key = {N, Kpseu}
N = pos_integer()
Kpseu = binary()
CompressedIMSI = binary()

Decrypt a temporary identity.

See 3GPP 33.402 14.1 Temporary identity generation.

encrypt_key/4

encrypt_key(Secret, RequestAuthenticator, Salt, Key) -> Ciphertext

Secret = binary()
RequestAuthenticator = [byte()]
Salt = integer()
Key = binary()
Ciphertext = binary()

Encrypt the Pairwise Master Key (PMK) according to RFC2548 section 2.4.2 for use as String in a MS-MPPE-Recv-Key or MS-MPPE-Send-Key attribute.

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