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package aead
import (
"crypto/hmac"
"crypto/sha256"
"hash"
)
func KDF(key []byte, path ...string) []byte {
hmacCreator := &hMacCreator{value: []byte(KDFSaltConstVMessAEADKDF)}
for _, v := range path {
hmacCreator = &hMacCreator{value: []byte(v), parent: hmacCreator}
}
hmacf := hmacCreator.Create()
hmacf.Write(key)
return hmacf.Sum(nil)
}
type hMacCreator struct {
parent *hMacCreator
value []byte
}
func (h *hMacCreator) Create() hash.Hash {
if h.parent == nil {
return hmac.New(sha256.New, h.value)
}
return hmac.New(h.parent.Create, h.value)
}
func KDF16(key []byte, path ...string) []byte {
r := KDF(key, path...)
return r[:16]
}
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