mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
35 lines
661 B
Go
35 lines
661 B
Go
package aead
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import (
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"crypto/hmac"
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"crypto/sha256"
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"hash"
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)
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func KDF(key []byte, path ...string) []byte {
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hmacCreator := &hMacCreator{value: []byte(KDFSaltConstVMessAEADKDF)}
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for _, v := range path {
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hmacCreator = &hMacCreator{value: []byte(v), parent: hmacCreator}
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}
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hmacf := hmacCreator.Create()
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hmacf.Write(key)
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return hmacf.Sum(nil)
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}
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type hMacCreator struct {
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parent *hMacCreator
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value []byte
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}
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func (h *hMacCreator) Create() hash.Hash {
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if h.parent == nil {
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return hmac.New(sha256.New, h.value)
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}
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return hmac.New(h.parent.Create, h.value)
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}
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func KDF16(key []byte, path ...string) []byte {
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r := KDF(key, path...)
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return r[:16]
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}
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