mirror of
https://github.com/logos-messaging/noise.git
synced 2026-01-02 14:13:07 +00:00
31 lines
574 B
Go
31 lines
574 B
Go
package noise
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import (
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"crypto/hmac"
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"hash"
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)
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func HKDF(h func() hash.Hash, out1, out2, chainingKey, inputKeyMaterial []byte) ([]byte, []byte) {
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if len(out1) > 0 {
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panic("len(out1) > 0")
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}
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if len(out2) > 0 {
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panic("len(out2) > 0")
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}
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tempMAC := hmac.New(h, chainingKey)
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tempMAC.Write(inputKeyMaterial)
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tempKey := tempMAC.Sum(out2)
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out1MAC := hmac.New(h, tempKey)
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out1MAC.Write([]byte{0x01})
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out1 = out1MAC.Sum(out1)
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out2MAC := hmac.New(h, tempKey)
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out2MAC.Write(out1)
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out2MAC.Write([]byte{0x02})
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out2 = out2MAC.Sum(tempKey[:0])
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return out1, out2
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}
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