Hi All,
We have a question regarding the PRF function in AKAv2(IETF RFC
4169). section 2.1 of the RFC 4169 states the following..
2.1. Password Generation
The client shall use base64 encoded [1] parameters PRF(RES||IK||CK,
"http-digest-akav2-password") as a "password" when calculating the
HTTP Digest response directive for AKAv2.
if the algorithm is AKAv2-MD5, then the PRF is HMAC_MD5.
RFC 2104 defines the HMAC_MD5 to be the following
/*
** Function: hmac_md5
*/
void
hmac_md5(text, text_len, key, key_len, digest)
unsigned char* text; /* pointer to data stream */
int text_len; /* length of data stream */
unsigned char* key; /* pointer to authentication key */
int key_len; /* length of authentication key */
caddr_t digest; /* caller digest to be filled in */
Our query
=========
hmac_md5() function takes text , key as inputs. As we understand key
corresponds to RES||IK||CK and text corresponds to
"http-digest-akav2-password"...we would like to know whether our
understanding is correct.
Raju
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