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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hashing’ Category

CyberChef: The Cyber Swiss Army Knife – a web app for encryption, encoding, compression and data analysis.

Posted by jpluimers on 2022/06/23

[Wayback/Archive.is] CyberChef:

a simple, intuitive web app for carrying out all manner of “cyber” operations within a web browser. These operations include simple encoding like XOR or Base64, more complex encryption like AES, DES and Blowfish, creating binary and hexdumps, compression and decompression of data, calculating hashes and checksums, IPv6 and X.509 parsing, changing character encodings, and much more.

Source code at [Wayback/Archive.is] gchq/CyberChef: The Cyber Swiss Army Knife – a web app for encryption, encoding, compression and data analysis.

Via [Archive.is] Jilles🏳️‍🌈 on Twitter: “Hidden in plain sight. Rot13 cross word. Hidden Barcodes. Qr codes. Barely any InfoSec skill required. Still a hand full. Usually my to go place is: Cyberchef. I did a fun one for cyberklaas using ansi art.… “

Jilles also pointed to the solving part in [Archive.is] Jilles🏳️‍🌈 on Twitter: “See also, for solving: SCWF… “

The [Wayback/Archive.is] Solve Crypto with Force! needs to run without most script blockers, so best run it in an anonymous/private browser window.

Source code for SCWF is at [Wayback/Archive.is] DaWouw/SCWF: CTF tool for identifying, brute forcing and decoding encryption schemes in an automated way.

Screen shot of Cyberchef example “Perform AES decryption, extracting the IV from the beginning of the cipher stream” [Archive.is]:

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Posted in Development, Encryption, Hashing, Power User, Security, Software Development | Leave a Comment »

Ryan O’Horo on Twitter : “Computerphile with a clear and complete explanation of how the block cipher AES works and how it’s different from older ciphers. Background info… “

Posted by jpluimers on 2021/09/01

From a while back, but still relevant: [WayBack] Ryan O’Horo sur Twitter : “Computerphile with a clear and complete explanation of how the block cipher AES works and how it’s different from older ciphers. Background https://t.co/WyvYpM5JJN SP Networks https://t.co/MGILCxkqUR AES Cipher https://t.co/ReHpnCBTvI… https://t.co/VbZomPrOow”

Videos below the fold

–jeroen

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Posted in Development, Encryption, Hashing, Power User, Security, Software Development | Leave a Comment »

Some links related to Apple’s NeuralHash algorithm, as it was reverse engineered and collisions can be generated so abuse with pictures matching sensitive hashes can be performed

Posted by jpluimers on 2021/08/24

Last week, I wrote [Archive.is] Jeroen Wiert Pluimers on Twitter: “Apple’s NeuralHash algorithm for automagically reporting sensitive images from iOS devices has not only been reverse engineered, but also collisions can now be generated. Now just wait for abuse of innocent pictures matching sensitive hashes. … “

Below, for my link archive, some relevant links on this:

–jeroen

Posted in AI and ML; Artificial Intelligence & Machine Learning, Development, Hashing, Power User, Security, Software Development | Leave a Comment »

Chocolatey: installing Oracle SQL Developer and updating the chocolatey package

Posted by jpluimers on 2021/05/13

Sometimes an install is not just as simple as C:\>choco install --yes oracle-sql-developer.

Edit 20210514:

Note that most of the below pain will be moot in the future as per [Archive.is] Jeff Smith 🍻 on Twitter: “we’re working on removing the SSO requirement, it’s already done for @oraclesqlcl – see here … “ referring to [Wayback] SQLcl now under the Oracle Free Use Terms and Conditions license | Oracle Database Insider Blog

SQLcl, the modern command-line interface for the Oracle Database, can now be downloaded directly from the web without any click-through license agreement.

It means the Oracle acount restriction will be lifted, and downloads will be a lot simpler.

I started with the below failing command, tried a lot of things, then finally almost gave up: Oracle stuff does not want to be automated, which means I should try to less of their stuff.

First of all you need an Oracle account (I dislike companies doing that for free product installs; I’m looking at Embarcadero too) by going to profile.oracle.com:

[WayBack] Chocolatey Gallery | Oracle SQL Developer 18.4.0 (also: gist.github.com/search?l=XML&q=oracle-sql-developer)

Notes

  • This version supports both 32bit and 64bit and subsequently does not have a JDK bundled with it. It has a
    dependency on the jdk8 package to meet the application’s JDK requirement.
  • An Oracle account is required to download this package. See the “Package Parameters” section below for
    details on how to provide your Oracle credentials to the installer. If you don’t have an existing account, you can
    create one for free here: https://profile.oracle.com/myprofile/account/create-account.jspx

Package Parameters

The following package parameters are required:

/Username: – Oracle username
/Password: – Oracle password

(e.g. choco install oracle-sql-developer --params "'/Username:MyUsername /Password:MyPassword'")

To have choco remember parameters on upgrade, be sure to set choco feature enable -n=useRememberedArgumentsForUpgrades.

Then the installation failed fail again: ERROR: The response content cannot be parsed because the Internet Explorer engine is not available, or Internet Explorer's first-launch configuration is not complete. Specify the UseBasicParsing parameter and try again.

The trick is to RUN IEXPLORE.EXE AS ADMINISTRATOR ONCE BEFORE INSTALLING FROM CHOCOLATEY. Who would believe that.

The reason is that the package uses Invoke-WebRequest which requires Internet Explorer and PowerShell 3. Chocolatey packages however need to be able to run on just PowerShell 2 without Invoke-WebRequest.

Maybe using cURL can remedy that; adding a dependency to is is possible, as cURL can be installed via chocolatey: [WayBack] How to Install cURL on Windows – I Don’t Know, Read The Manual. Another alternative might be [WayBack] Replace Invoke-RestMethod in PowerShell 2.0 to use [WayBack] WebRequest Class (System.Net) | Microsoft Docs.

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Posted in CertUtil, Chocolatey, CommandLine, Database Development, Development, DVCS - Distributed Version Control, git, Hashing, OracleDB, Power User, PowerShell, Security, SHA, SHA-1, Software Development, Source Code Management, Windows, XML, XML/XSD | Leave a Comment »

Supermicro Bios Update – YouTube

Posted by jpluimers on 2020/09/14

I needed to get myself an OOB license for the BIOS update over the IPMI console or SUM (Supermicro Update Manager). An IPMI update can be done without an OOB license from the IPMI console, but the BIOS requires a license.

Links that initially helped me with that to get a feel for what I needed:

I thought that likely I need to purchase a key for it:

Obtain the license code from your IPMI BMC MAC address

But then I found out the below links on reverse engineering.

From those links, I checked both the Perl and Linux OpenSSL versions. Only the Perl version works on MacOS.

Then I fiddled with the bash version: unlike the OpenSSL version above, this one printed output. It wrongly printed the last groups of hex digits instead of the first groups of hex digits that the Perl script prints.

Here is the corrected bash script printing the first groups of hex digits (on my systems, I have an alias supermicro_hash_IPMI_BMC_MAC_address_to_get_OOB_license_for_BIOS_update for it):

#!/bin/bash
function hash_mac {
  mac="$1"
  key="8544e3b47eca58f9583043f8"
  sub="\x"
  #convert mac to hex
  hexmac="\x${mac//:/$sub}"
  #create hash
  code=$(printf "$hexmac" | openssl dgst -sha1 -mac HMAC -macopt hexkey:"$key")
  #DEBUG
  echo "$mac"
  echo "$hexmac"
  echo "$code"

  echo "${code:0:4}-${code:4:4}-${code:8:4}-${code:12:4}-${code:16:4}-${code:20:4}"
}

Steps

Reverse engineering links

  • [WayBack] The better way to update Supermicro BIOS is via IPMI – VirtualLifestyle.nl

    Another way to update the BIOS via the Supermicro IPMI for free is simply calculating the license key yourself as described here: https://peterkleissner.com/2018/05/27/reverse-engineering-supermicro-ipmi/ [WayBack].

    • [WayBack] Reverse Engineering Supermicro IPMI – peterkleissner.com

      Algorithm:

      MAC-SHA1-96(INPUT: MAC address of BMC, SECRET KEY: 85 44 E3 B4 7E CA 58 F9 58 30 43 F8)

      Update 1/14/2019: The Twitter user @astraleureka posted this code perl code which is generating the license key:

      #!/usr/bin/perl
      use strict;
      use Digest::HMAC_SHA1 'hmac_sha1';
      my $key  = "\x85\x44\xe3\xb4\x7e\xca\x58\xf9\x58\x30\x43\xf8";
      my $mac  = shift || die 'args: mac-addr (i.e. 00:25:90:cd:26:da)';
      my $data = join '', map { chr hex $_ } split ':', $mac;
      my $raw  = hmac_sha1($data, $key);
      printf "%02lX%02lX-%02lX%02lX-%02lX%02lX-%02lX%02lX-%02lX%02lX-%02lX%02lX\n", (map { ord $_ } split '', $raw);

      Update 3/27/2019: There is also Linux shell version that uses openssl:

      echo -n 'bmc-mac' | xxd -r -p | openssl dgst -sha1 -mac HMAC -macopt hexkey:8544E3B47ECA58F9583043F8 | awk '{print $2}' | cut -c 1-24
    • [WayBack] Modular conversion, encoding and encryption online — Cryptii

      Web app offering modular conversion, encoding and encryption online. Translations are done in the browser without any server interaction. This is an Open Source project, code licensed MIT.

      Steps:

      1. In the left pane, select the “View” drop-down to be “Bytes”, then paste the HEX bytes of your IPMI MAC address there (like 00 25 90 7d 9c 25)
      2. In the middle pane, select the drop-down to become “HMAC” followed by the radio-group to be “SHA1“, then paste these bytes into the “Key” field: 85 44 E3 B4 7E CA 58 F9 58 30 43 F8
      3. In the right pane, select the drop-down to become “Bytes”, then the “Group by” to become “2 bytes”, which will you give the output (where the bold part is the license key: 6 groups of 2 bytes): a7d5 2201 4eee 667d dbd2 5106 9595 2ff7 67b8 fb59

      Result:

    • Michael Stapelberg’s private website, containing articles about computers and programming, mostly focused on Linux.[WayBack] Securing SuperMicro’s IPMI with OpenVPN
    • [WayBack] GitHub – ReFirmLabs/binwalk: Firmware Analysis Tool
  • [WayBack] The better way to update Supermicro BIOS is via IPMI – VirtualLifestyle.nl

    Ahh…..a few corrections :-P

    #!/bin/bash
    function hash_mac {
      mac="$1"
      key="8544e3b47eca58f9583043f8"
      sub="\x"
      #convert mac to hex
      hexmac="\x${mac//:/$sub}"
      #create hash
      code=$(printf "$hexmac" | openssl dgst -sha1 -mac HMAC -macopt hexkey:"$key")
      #DEBUG
      echo "$mac"
      echo "$hexmac"
      echo "$code"
      echo "${code:9:4} ${code:13:4} ${code:17:4} ${code:21:4} ${code:25:4} ${code:29:4}"
    }
    #hex output with input
    hash_mac "$1"
    
    #Look out for the quotes, they might get changed by different encoding
  • [WayBack] The better way to update Supermicro BIOS is via IPMI – VirtualLifestyle.nl

    Thanks Peter. For anyone interested, here’s a bash script that takes the MAC as the only argument and outputs the activation key:

    #!/bin/bash
    function hash_mac {
      mac="$1"
      key="8544e3b47eca58f9583043f8"
      sub="\x"
      #convert mac to hex
      hexmac="\x${mac//:/$sub}"
      #create hash
      code=$(printf "$hexmac" | openssl dgst -sha1 -mac HMAC -macopt hexkey:"$key")
      ## DEBUG
      echo "$mac"
      echo "$hexmac"
      echo "$code"
      echo "${code:9:4} ${code:13:4} ${code:17:4} ${code:21:4} ${code:25:4} ${code:29:4}"
    }
    ## hex output with input
    hash_mac "$1"

 

–jeroen

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Posted in Development, Encoding, Hardware, Hashing, HMAC, Mainboards, OpenSSL, Power User, Security, SHA, SHA-1, Software Development, SuperMicro, X10SRH-CF | Leave a Comment »

 
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