mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-11-10 18:25:17 +00:00
86 lines
2.3 KiB
Go
86 lines
2.3 KiB
Go
package crypto
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import (
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"crypto/sha512"
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"golang.org/x/crypto/hkdf"
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"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves"
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)
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var domainSeparators = map[string][]byte{
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curves.ED448().Name: {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF,
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},
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}
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func SenderX3DH(
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sendingIdentityPrivateKey curves.Scalar,
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sendingEphemeralPrivateKey curves.Scalar,
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receivingIdentityKey curves.Point,
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receivingSignedPreKey curves.Point,
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sessionKeyLength uint8,
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) []byte {
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xdh1 := receivingSignedPreKey.Mul(
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sendingIdentityPrivateKey,
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).ToAffineCompressed()
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xdh2 := receivingIdentityKey.Mul(
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sendingEphemeralPrivateKey,
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).ToAffineCompressed()
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xdh3 := receivingSignedPreKey.Mul(
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sendingEphemeralPrivateKey,
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).ToAffineCompressed()
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salt := make([]byte, sessionKeyLength)
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x3dh := hkdf.New(sha512.New, append(
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append(
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append(
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append([]byte{}, domainSeparators[receivingIdentityKey.CurveName()]...),
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xdh1[:]...),
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xdh2[:]...),
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xdh3[:]...), salt, []byte("quilibrium-x3dh"))
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sessionKey := make([]byte, sessionKeyLength)
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if _, err := x3dh.Read(sessionKey[:]); err != nil {
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return nil
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}
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return sessionKey
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}
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func ReceiverX3DH(
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sendingIdentityPrivateKey curves.Scalar,
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sendingSignedPrePrivateKey curves.Scalar,
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receivingIdentityKey curves.Point,
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receivingEphemeralKey curves.Point,
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sessionKeyLength uint8,
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) []byte {
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xdh1 := receivingIdentityKey.Mul(
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sendingSignedPrePrivateKey,
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).ToAffineCompressed()
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xdh2 := receivingEphemeralKey.Mul(
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sendingIdentityPrivateKey,
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).ToAffineCompressed()
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xdh3 := receivingEphemeralKey.Mul(
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sendingSignedPrePrivateKey,
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).ToAffineCompressed()
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salt := make([]byte, sessionKeyLength)
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x3dh := hkdf.New(sha512.New, append(
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append(
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append(
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append([]byte{}, domainSeparators[receivingIdentityKey.CurveName()]...),
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xdh1[:]...),
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xdh2[:]...),
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xdh3[:]...), salt, []byte("quilibrium-x3dh"))
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sessionKey := make([]byte, sessionKeyLength)
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if _, err := x3dh.Read(sessionKey[:]); err != nil {
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return nil
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}
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return sessionKey
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}
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