Hi, Everyone - How to get or know Base64 Log ID

[home pc]

Hi

Hi, Everyone - How to get or know Base64 Log ID..?

[Pierre Phaneuf]

You cannot get the log ID from the log itself, but you can find the
log ID of the logs that we known of here:

https://www.certificate-transparency.org/known-logs

The log ID is the SHA-256 hash of the log's public key.

On Sat, Nov 18, 2017 at 8:16 AM, home pc <amitkumar...@gmail.com> wrote:
> Hi
> Hi, Everyone - How to get or know Base64 Log ID..?
>

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[home pc]

Okay thanks, but other company have base64 id

You can see in this link:  https://www.certificate-transparency.org/known-logs

[Al Cutter]

Hi,

Here's an example with the Digicert ct2 log's public key (the string being echo'd is the base64 encoding of its public key in DER format, you can replace this with your base64 encoded public key in DER format to get your LogID):

$ echo -n "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEzF05L2a4TH/BLgOhNKPoioYCrkoRxvcmajeb8Dj4XQmNY+gxa4Zmz3mzJTwe33i0qMVp+rfwgnliQ/bM/oFmhA==" | base64 --decode | openssl dgst -sha256 -binary | base64

h3W/51l8+IxDmV+9827/Vo1HVjb/SrVgwbTq/16ggw8=

You'll see that the output base64 string matches the LogID for that log on the known-logs page you referenced: 

h3W/51l8+IxDmV+9827/Vo1HVjb/SrVgwbTq/16ggw8=

HTH.

Cheers,
Al.

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[home pc]

Lots of Thanks and Thank You Brother, its working and My Certificate Transparency is almost 70-80% completed, My name is Prafful Kumar Sinha and Am from India.

Please Please don't go....I have few question....I will ask to you an another days...

On Saturday, November 18, 2017 at 1:46:20 PM UTC+5:30, home pc wrote:

[Ray Cheng]

FWIW, the log ID is in the 'id' field of the 'add-chain' or 'add-pre-chain' response. This should of course match the calculated value.

Sample response for Venafi Gen2 log:

{

    "sct_version": 0,

    "id": "AwGd8/2FppqOvR+sxtqbpz5Gl3T+d/V5/FoIuDKMHWs=",

    "timestamp": 1511456875855,

    "extensions": "",

    "signature": "BAMARzBFAiEA+T0qYhb0WrAN1EXsvra/WcWENIs4KOSBZwkJ4j9WxsACIE6akR+mNfd+LvI3riNbbzpoi9Zk1sur0KY/vbNFGv/I"

}