api - DTLS 1.2 Master key derivation -


i implementing dtls 1.2 , using cipher tls_ecdhe_rsa_with_aes_128_gcm_sha256

i creating pre-master secret , master secret key using following steps

1- open algorithm provider using api bcryptopenalgorithmprovider

2- generate key pair using api bcryptgeneratekeypair

3- export public key using api bcryptexportkey

4- import other party public key using api bcryptimportkeypair

5- after generate secret agreement handle using private key , other party public key using api bcryptsecretagreement

6- secret key using api bcryptderivekey

am missing because master key not correct.

i guess depends on parameters passing bcryptderivekey. should specify tls 1.2 pseudorandom function in parameters based on sha256 , not on md5 , sha1 tls 1.1 / dtls 1.0.


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