mirror of
https://github.com/refraction-networking/uquic.git
synced 2025-04-04 12:47:36 +03:00
52 lines
1.9 KiB
Go
52 lines
1.9 KiB
Go
package handshake
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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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"github.com/marten-seemann/qtls"
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)
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var quicVersion1Salt = []byte{0x7f, 0xbc, 0xdb, 0x0e, 0x7c, 0x66, 0xbb, 0xe9, 0x19, 0x3a, 0x96, 0xcd, 0x21, 0x51, 0x9e, 0xbd, 0x7a, 0x02, 0x64, 0x4a}
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var initialSuite = &qtls.CipherSuiteTLS13{
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ID: qtls.TLS_AES_128_GCM_SHA256,
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KeyLen: 16,
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AEAD: qtls.AEADAESGCMTLS13,
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Hash: crypto.SHA256,
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}
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// NewInitialAEAD creates a new AEAD for Initial encryption / decryption.
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func NewInitialAEAD(connID protocol.ConnectionID, pers protocol.Perspective) (LongHeaderSealer, LongHeaderOpener, error) {
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clientSecret, serverSecret := computeSecrets(connID)
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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 := computeInitialKeyAndIV(mySecret)
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otherKey, otherIV := computeInitialKeyAndIV(otherSecret)
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encrypter := qtls.AEADAESGCMTLS13(myKey, myIV)
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decrypter := qtls.AEADAESGCMTLS13(otherKey, otherIV)
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return newLongHeaderSealer(encrypter, newHeaderProtector(initialSuite, mySecret, true)),
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newLongHeaderOpener(decrypter, newAESHeaderProtector(initialSuite, otherSecret, true)),
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nil
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}
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func computeSecrets(connID protocol.ConnectionID) (clientSecret, serverSecret []byte) {
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initialSecret := qtls.HkdfExtract(crypto.SHA256, connID, quicVersion1Salt)
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clientSecret = qtls.HkdfExpandLabel(crypto.SHA256, initialSecret, []byte{}, "client in", crypto.SHA256.Size())
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serverSecret = qtls.HkdfExpandLabel(crypto.SHA256, initialSecret, []byte{}, "server in", crypto.SHA256.Size())
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return
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}
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func computeInitialKeyAndIV(secret []byte) (key, iv []byte) {
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key = qtls.HkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic key", 16)
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iv = qtls.HkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic iv", 12)
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return
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}
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