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Fix incorrect HMac Chaining, further checking needed

This commit is contained in:
Shelikhoo 2021-02-22 13:20:36 +00:00
parent efb963237c
commit 0024c6e028
No known key found for this signature in database
GPG Key ID: C4D5E79D22B25316

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@ -7,16 +7,27 @@ import (
)
func KDF(key []byte, path ...string) []byte {
var hmacf hash.Hash
hmacCreator := &hMacCreator{value: []byte(KDFSaltConstVMessAEADKDF)}
for _, v := range path {
hmacf = hmac.New(func() hash.Hash {
return hmac.New(sha256.New, []byte(KDFSaltConstVMessAEADKDF))
}, []byte(v))
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]