50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package handshake
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import (
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"crypto/rand"
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"encoding/binary"
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"time"
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)
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// Consts for Random in Handshake
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const (
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RandomBytesLength = 28
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RandomLength = RandomBytesLength + 4
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)
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// Random value that is used in ClientHello and ServerHello
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//
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// https://tools.ietf.org/html/rfc4346#section-7.4.1.2
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type Random struct {
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GMTUnixTime time.Time
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RandomBytes [RandomBytesLength]byte
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}
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// MarshalFixed encodes the Handshake
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func (r *Random) MarshalFixed() [RandomLength]byte {
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var out [RandomLength]byte
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binary.BigEndian.PutUint32(out[0:], uint32(r.GMTUnixTime.Unix()))
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copy(out[4:], r.RandomBytes[:])
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return out
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}
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// UnmarshalFixed populates the message from encoded data
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func (r *Random) UnmarshalFixed(data [RandomLength]byte) {
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r.GMTUnixTime = time.Unix(int64(binary.BigEndian.Uint32(data[0:])), 0)
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copy(r.RandomBytes[:], data[4:])
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}
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// Populate fills the handshakeRandom with random values
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// may be called multiple times
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func (r *Random) Populate() error {
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r.GMTUnixTime = time.Now()
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tmp := make([]byte, RandomBytesLength)
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_, err := rand.Read(tmp)
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copy(r.RandomBytes[:], tmp)
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return err
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}
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