mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-09-14 07:58:16 -04:00
53 lines
1.9 KiB
Go
53 lines
1.9 KiB
Go
package handshake
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import (
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"crypto"
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"crypto/aes"
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"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/protocol"
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"v2ray.com/core/external/github.com/marten-seemann/qtls"
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)
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var quicVersion1Salt = []byte{0xef, 0x4f, 0xb0, 0xab, 0xb4, 0x74, 0x70, 0xc4, 0x1b, 0xef, 0xcf, 0x80, 0x31, 0x33, 0x4f, 0xae, 0x48, 0x5e, 0x09, 0xa0}
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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) (Sealer, Opener, 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, myHPKey, myIV := computeInitialKeyAndIV(mySecret)
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otherKey, otherHPKey, otherIV := computeInitialKeyAndIV(otherSecret)
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encrypter := qtls.AEADAESGCM13(myKey, myIV)
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hpEncrypter, err := aes.NewCipher(myHPKey)
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if err != nil {
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return nil, nil, err
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}
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decrypter := qtls.AEADAESGCM13(otherKey, otherIV)
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hpDecrypter, err := aes.NewCipher(otherHPKey)
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if err != nil {
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return nil, nil, err
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}
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return newSealer(encrypter, hpEncrypter, false), newOpener(decrypter, hpDecrypter, false), 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, hpKey, iv []byte) {
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key = qtls.HkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic key", 16)
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hpKey = qtls.HkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic hp", 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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