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1. Clover configurator generate serial number serial numbers#
2. Clover configurator generate serial number serial number#

Clover configurator generate serial number serial numbers#

Generated serial numbers are 19 (38 hex chars) bytes long: Length Similar to default option where first component ( GetTickCount()) is replaced with CryptGenRandom() function call. See remarks section for more details.Įxample: 11 00 00 01 10 2e cf 52 a1 b2 24 d1 aa 00 00 00 00 00 02 Option 3: HighSerial = REG_DWORD:0xFFFFFFFF If HighSerial is between 0x01-0x0f, random bits are inserted in most-significant 2-4 bits. Sign bit is set to 0 (to force positive integer). If registry value is in range 0x80÷0xfffffffe, only least-significant byte is accounted and is inserted as first byte of serial number. This option adds cryptographic random component inside serial number. Generated serial numbers are 10 (20 hex chars) bytes long: LengthĮxample: 15 fb a3 bb 00 00 00 00 00 02 Option 2: HighSerial = REG_DWORD:0x1÷0x7f

Clover configurator generate serial number serial number#

This option enables default serial number algorithm. In certain cases its type is changed to REG_SZ (string). Serial number configuration is stored in registry HKLM:\SYSTEM\CurrentControlSet\Services\CertSvc\Configuration\CAName\HighSerialĪnd it is a REG_DWORD value by default. In this post, I’m outlining all information I was able to get from different sources, including Microsoft in a more clear way. However I found this article hard to understand and it misses some interesting details. I found only one Microsoft article that talks about this topic: Configure Serial Number Generation. Microsoft ADCS Certification Authority implementation (excluding 0x80÷0xff range for most significant byte), others may use cryptographically random serial numbers, GUID-based or custom conforming algorithm. Some allow generation of sequential serial numbers starting with 0x00, 0x01, 0x02, etc. Various CA engines implement different serial number generation algorithms. 0x00 0x00 0x01 serial number is truncated to 0x01. This means the first byte must be in range 0x0÷0x7f with a whole integer value up to 20 bytes. If first byte is zero, this byte is truncated unless it is the only byte. As per RFC 5280 §4.1.2.2, serial numbers MUST be unique, not greater than 20 bytes long non-negative integer and at least 1 bit must be enabled in first byte.

This article assumes big-endian encoding Certificate serial number requirementsĮvery X.509 conforming CA generates a unique serial number for each issued certificate, which in fact is a long integer. Today I will share information about a little-known portion in configuration of Microsoft ADCS Certification Authority – serial number generation algorithm. Hello S-1-1-0, is again on a failboatboard with new blog post.