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AspNetCrypter version updated Jun 26, 2017
AspNetDerive AspNetDerive added Nov 30, 2016
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README.md updated readme Nov 30, 2016

README.md

ASP.NET Crypter (AspNetCrypter)

It's a small tool to decrypt the ASP.NET protected data offline. The crypto code is copied from the Microsoft's reference source repository. For now it supports only owin.cookies, but please create an issue if you would like to have another part of ASP.NET decrypted. The command line looks as follows:

AspNetCrypter v0.0.1.0 - a tool for decryption ASP.NET protected data
Copyright (C) 2016 Sebastian Solnica (@lowleveldesign)

Usage: aspnetcrypter [OPTIONS] encrypteddata

Options:
      --vk=VALUE             the validation key (in hex)
      --dk=VALUE             the decryption key (in hex)
  -p, --purpose=VALUE        the encryption context
                               (currently only: owin.cookie)
      --base64               data is provided in base64 format (otherwise we
                               assume hex)
  -h, --help                 Show this message and exit
  -?                         Show this message and exit

Notice, you need to provide the master keys for encryption and validation. An example call might look as follows:

aspnetcrypter --dk=0xa5e27...281146d52 --vk=0x507de...34e29a820f6 --purpose=owin.cookie --base64 i1movjk3P...H0FEiSSYxvAy0HY6bIGJNbQ

0000: 03 00 00 00 11 41 70 70 6c 69 63 61 74 69 6f 6e  .....Application
0010: 43 6f 6f 6b 69 65 01 00 01 00 04 00 00 00 44 68  Cookie........Dh
0020: 74 74 70 3a 2f 2f 73 63 68 65 6d 61 73 2e 78 6d  ttp://schemas.xm
0030: 6c 73 6f 61 70 2e 6f 72 67 2f 77 73 2f 32 30 30  lsoap.org/ws/200
0040: 35 2f 30 35 2f 69 64 65 6e 74 69 74 79 2f 63 6c  5/05/identity/cl
0050: 61 69 6d 73 2f 6e 61 6d 65 69 64 65 6e 74 69 66  aims/nameidentif
0060: 69 65 72 24 31 64 35 31 62 32 34 63 2d 66 35 65  ier.1d51b24c-f5e
0070: 61 2d 34 61 33 62 2d 39 39 39 65 2d 63 35 37 31  a-4a3b-999e-c571
0080: 61 39 34 31 30 63 63 64 01 00 01 00 01 00 01 00  a9410ccd........
0090: 0d 74 65 73 74 40 74 65 73 74 2e 63 6f 6d 01 00  .test@test.com..
00a0: 01 00 01 00 51 68 74 74 70 3a 2f 2f 73 63 68 65  ....Qhttp://sche
00b0: 6d 61 73 2e 6d 69 63 72 6f 73 6f 66 74 2e 63 6f  mas.microsoft.co
00c0: 6d 2f 61 63 63 65 73 73 63 6f 6e 74 72 6f 6c 73  m/accesscontrols
00d0: 65 72 76 69 63 65 2f 32 30 31 30 2f 30 37 2f 63  ervice/2010/07/c
00e0: 6c 61 69 6d 73 2f 69 64 65 6e 74 69 74 79 70 72  laims/identitypr
00f0: 6f 76 69 64 65 72 10 41 53 50 2e 4e 45 54 20 49  ovider.ASP.NET.I
0100: 64 65 6e 74 69 74 79 01 00 01 00 01 00 1d 41 73  dentity.......As
0110: 70 4e 65 74 2e 49 64 65 6e 74 69 74 79 2e 53 65  pNet.Identity.Se
0120: 63 75 72 69 74 79 53 74 61 6d 70 24 36 33 62 61  curityStamp.63ba
0130: 39 65 62 33 2d 33 66 64 38 2d 34 31 36 35 2d 39  9eb3-3fd8-4165-9
0140: 32 34 33 2d 38 37 33 62 64 33 66 62 64 34 35 39  243-873bd3fbd459
0150: 01 00 01 00 01 00 00 00 00 00 01 00 00 00 02 00  ................
0160: 00 00 08 2e 65 78 70 69 72 65 73 1d 54 75 65 2c  ....expires.Tue,
0170: 20 30 36 20 44 65 63 20 32 30 31 36 20 31 35 3a  .06.Dec.2016.15:
0180: 30 34 3a 33 31 20 47 4d 54 07 2e 69 73 73 75 65  04:31.GMT..issue
0190: 64 1d 54 75 65 2c 20 32 32 20 4e 6f 76 20 32 30  d.Tue,.22.Nov.20
01a0: 31 36 20 31 35 3a 30 34 3a 33 31 20 47 4d 54     16.15:04:31.GMT

ASP.NET Key Derive Tool (AspNetDerive)

A tool to calculate the derived ASP.NET keys, based on a master key. The command line looks as follows:

AspNetDerive v1.0.0.0 - AspNetDerive - a tool to create the derivative ASP.NET keys
Copyright c 2016 Sebastian Solnica (@lowleveldesign)

Usage: aspnetderive [OPTIONS]

Options:
  -k, --key=VALUE            the validation key (in hex)
  -c, --context=VALUE        the context
  -l, --labels=VALUE         the labels, separated by commas
  -h, --help                 show this message and exit
  -?                         show this message and exit

Example usage:

PS Debug> .\AspNetDerive.exe -k 1726E744C1FF4A6E84A1B511CDDADD10A1AB082044238A10533F8BBB87201926 -c "MachineKeyDerivation" -l "IsolateApps: /"
0000: f2 e0 94 2f 79 0a d1 bb 01 eb 90 50 5c 8b b8 c0  oa./y.N».ë.P\..A
0010: f5 28 41 9b bc fb 6a e2 42 cc cc 7b 51 52 53 8c  o(A..ujâBII{QRS.