问题如标题 声网有这么个配置

   /**
     * SDK 加密配置
     */
    fun enableEncryption(
        from: ContactUserId,
        to: ContactUserId,
        randomBytes: ByteArray,
    ): Boolean {
        val material = buildString {
            append(from.teamId)
            append(from.userId)
            append(to.teamId)
            append(to.userId)
            append(bytesToHex(randomBytes))
        }.toByteArray()
        val bytes = smCipher.sm3KDF(material, 64)
        val secretKey = bytes.copyOfRange(0, 32)
        val salt = bytes.copyOfRange(32, 64)

        val config = EncryptionConfig()
        config.encryptionMode = EncryptionConfig.EncryptionMode.SM4_128_ECB
        // 声网底层处理 hex String 时大小写敏感，这里与其他端保持统一，小写
        config.encryptionKey = bytesToHex(secretKey)
        System.arraycopy(
            salt,
            0,
            config.encryptionKdfSalt,
            0,
            config.encryptionKdfSalt.size
        )
        val result = rtcEngine?.enableEncryption(true, config)
        Timber.d("$tag enableEncryption: $result")
        return result == 0
    }