forked from quic-go/quic-go
41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
package crypto
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import (
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"crypto"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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)
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var quicVersion1Salt = []byte{0x9c, 0x10, 0x8f, 0x98, 0x52, 0x0a, 0x5c, 0x5c, 0x32, 0x96, 0x8e, 0x95, 0x0e, 0x8a, 0x2c, 0x5f, 0xe0, 0x6d, 0x6c, 0x38}
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func newNullAEADAESGCM(connectionID protocol.ConnectionID, pers protocol.Perspective) (AEAD, error) {
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clientSecret, serverSecret := computeSecrets(connectionID)
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var mySecret, otherSecret []byte
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if pers == protocol.PerspectiveClient {
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mySecret = clientSecret
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otherSecret = serverSecret
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} else {
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mySecret = serverSecret
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otherSecret = clientSecret
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}
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myKey, myIV := computeNullAEADKeyAndIV(mySecret)
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otherKey, otherIV := computeNullAEADKeyAndIV(otherSecret)
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return NewAEADAESGCM(otherKey, myKey, otherIV, myIV)
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}
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func computeSecrets(connID protocol.ConnectionID) (clientSecret, serverSecret []byte) {
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handshakeSecret := hkdfExtract(crypto.SHA256, connID, quicVersion1Salt)
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clientSecret = qhkdfExpand(handshakeSecret, "client hs", crypto.SHA256.Size())
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serverSecret = qhkdfExpand(handshakeSecret, "server hs", crypto.SHA256.Size())
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return
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}
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func computeNullAEADKeyAndIV(secret []byte) (key, iv []byte) {
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key = qhkdfExpand(secret, "key", 16)
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iv = qhkdfExpand(secret, "iv", 12)
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return
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}
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