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Implement FingerprintClientHello to generate ClientHelloSpec from ClientHello raw bytes (#67)

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maxb 2020-12-09 21:37:06 -08:00 • committed by GitHub
parent f7e7360167
commit 2179f28668
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10 changed files with 1652 additions and 159 deletions
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14
u_common.go
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@ -162,6 +162,20 @@ var (
// https://tools.ietf.org/html/draft-ietf-tls-grease-01
const GREASE_PLACEHOLDER = 0x0a0a
func isGREASEUint16(v uint16) bool {
// First byte is same as second byte
// and lowest nibble is 0xa
return ((v >> 8) == v&0xff) && v&0xf == 0xa
}
func unGREASEUint16(v uint16) uint16 {
if isGREASEUint16(v) {
return GREASE_PLACEHOLDER
} else {
return v
}
}
// utlsMacSHA384 returns a SHA-384 based MAC. These are only supported in TLS 1.2
// so the given version is ignored.
func utlsMacSHA384(version uint16, key []byte) macFunction {