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handshake.go
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handshake.go
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package core
import (
"bytes"
"crypto/hmac"
"crypto/rand"
"crypto/sha256"
"fmt"
"io"
"time"
"github.com/dudebing99/livego/utils/pio"
)
var (
timeout = 5 * time.Second
)
var (
hsClientFullKey = []byte{
'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ',
'0', '0', '1',
0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1,
0x02, 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB,
0x93, 0xB8, 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE,
}
hsServerFullKey = []byte{
'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ',
'S', 'e', 'r', 'v', 'e', 'r', ' ',
'0', '0', '1',
0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1,
0x02, 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB,
0x93, 0xB8, 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE,
}
hsClientPartialKey = hsClientFullKey[:30]
hsServerPartialKey = hsServerFullKey[:36]
)
func hsMakeDigest(key []byte, src []byte, gap int) (dst []byte) {
h := hmac.New(sha256.New, key)
if gap <= 0 {
h.Write(src)
} else {
h.Write(src[:gap])
h.Write(src[gap+32:])
}
return h.Sum(nil)
}
func hsCalcDigestPos(p []byte, base int) (pos int) {
for i := 0; i < 4; i++ {
pos += int(p[base+i])
}
pos = (pos % 728) + base + 4
return
}
func hsFindDigest(p []byte, key []byte, base int) int {
gap := hsCalcDigestPos(p, base)
digest := hsMakeDigest(key, p, gap)
if bytes.Compare(p[gap:gap+32], digest) != 0 {
return -1
}
return gap
}
func hsParse1(p []byte, peerkey []byte, key []byte) (ok bool, digest []byte) {
var pos int
if pos = hsFindDigest(p, peerkey, 772); pos == -1 {
if pos = hsFindDigest(p, peerkey, 8); pos == -1 {
return
}
}
ok = true
digest = hsMakeDigest(key, p[pos:pos+32], -1)
return
}
func hsCreate01(p []byte, time uint32, ver uint32, key []byte) {
p[0] = 3
p1 := p[1:]
rand.Read(p1[8:])
pio.PutU32BE(p1[0:4], time)
pio.PutU32BE(p1[4:8], ver)
gap := hsCalcDigestPos(p1, 8)
digest := hsMakeDigest(key, p1, gap)
copy(p1[gap:], digest)
}
func hsCreate2(p []byte, key []byte) {
rand.Read(p)
gap := len(p) - 32
digest := hsMakeDigest(key, p, gap)
copy(p[gap:], digest)
}
func (conn *Conn) HandshakeClient() (err error) {
var random [(1 + 1536*2) * 2]byte
C0C1C2 := random[:1536*2+1]
C0 := C0C1C2[:1]
C0C1 := C0C1C2[:1536+1]
C2 := C0C1C2[1536+1:]
S0S1S2 := random[1536*2+1:]
C0[0] = 3
// > C0C1
conn.Conn.SetDeadline(time.Now().Add(timeout))
if _, err = conn.rw.Write(C0C1); err != nil {
return
}
conn.Conn.SetDeadline(time.Now().Add(timeout))
if err = conn.rw.Flush(); err != nil {
return
}
// < S0S1S2
conn.Conn.SetDeadline(time.Now().Add(timeout))
if _, err = io.ReadFull(conn.rw, S0S1S2); err != nil {
return
}
S1 := S0S1S2[1 : 1536+1]
if ver := pio.U32BE(S1[4:8]); ver != 0 {
C2 = S1
} else {
C2 = S1
}
// > C2
conn.Conn.SetDeadline(time.Now().Add(timeout))
if _, err = conn.rw.Write(C2); err != nil {
return
}
conn.Conn.SetDeadline(time.Time{})
return
}
func (conn *Conn) HandshakeServer() (err error) {
var random [(1 + 1536*2) * 2]byte
C0C1C2 := random[:1536*2+1]
C0 := C0C1C2[:1]
C1 := C0C1C2[1 : 1536+1]
C0C1 := C0C1C2[:1536+1]
C2 := C0C1C2[1536+1:]
S0S1S2 := random[1536*2+1:]
S0 := S0S1S2[:1]
S1 := S0S1S2[1 : 1536+1]
S0S1 := S0S1S2[:1536+1]
S2 := S0S1S2[1536+1:]
// < C0C1
conn.Conn.SetDeadline(time.Now().Add(timeout))
if _, err = io.ReadFull(conn.rw, C0C1); err != nil {
return
}
conn.Conn.SetDeadline(time.Now().Add(timeout))
if C0[0] != 3 {
err = fmt.Errorf("rtmp: handshake version=%d invalid", C0[0])
return
}
S0[0] = 3
clitime := pio.U32BE(C1[0:4])
srvtime := clitime
srvver := uint32(0x0d0e0a0d)
cliver := pio.U32BE(C1[4:8])
if cliver != 0 {
var ok bool
var digest []byte
if ok, digest = hsParse1(C1, hsClientPartialKey, hsServerFullKey); !ok {
err = fmt.Errorf("rtmp: handshake server: C1 invalid")
return
}
hsCreate01(S0S1, srvtime, srvver, hsServerPartialKey)
hsCreate2(S2, digest)
} else {
copy(S1, C2)
copy(S2, C1)
}
// > S0S1S2
conn.Conn.SetDeadline(time.Now().Add(timeout))
if _, err = conn.rw.Write(S0S1S2); err != nil {
return
}
conn.Conn.SetDeadline(time.Now().Add(timeout))
if err = conn.rw.Flush(); err != nil {
return
}
// < C2
conn.Conn.SetDeadline(time.Now().Add(timeout))
if _, err = io.ReadFull(conn.rw, C2); err != nil {
return
}
conn.Conn.SetDeadline(time.Time{})
return
}