mirror of https://github.com/XTLS/Xray-core.git
34 lines
521 B
Go
34 lines
521 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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type hash2 struct {
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hash.Hash
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}
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func KDF(key []byte, path ...string) []byte {
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hmacf := hmac.New(sha256.New, []byte(KDFSaltConstVMessAEADKDF))
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for _, v := range path {
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first := true
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hmacf = hmac.New(func() hash.Hash {
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if first {
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first = false
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return hash2{hmacf}
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}
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return hmacf
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}, []byte(v))
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}
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hmacf.Write(key)
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return hmacf.Sum(nil)
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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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