Setting Key Usage attributes with Makecert

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故里飘歌
故里飘歌 2021-02-18 21:43

Is it possible to set Key Usage attributes using makecert, or any other tool I can use to generate my own test certificates?

The reason I\'m interested is that certifica

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  • 2021-02-18 22:21

    While you cannot make a self-signed cert and set the Enhanced Key Usage parameters using makecert I thought I'd save everyone the trouble of trying to use go down the path of using OpenSSL to generate a cert on Windows. Instead, you can use certreq (which is available if you already have makecert) and fashion your own request to set the required parameters.

    For example, this sets up a cert with an EKU of Document Encryption (1.3.6.1.4.1.311.80.1) and key usages of Key Encipherment and Data Encipherment.

    Create a new file, MyCert.inf:

    [Version]
    Signature = "$Windows NT$"
    
    [Strings]
    szOID_ENHANCED_KEY_USAGE = "2.5.29.37"
    szOID_DOCUMENT_ENCRYPTION = "1.3.6.1.4.1.311.80.1"
    
    [NewRequest]
    Subject = "cn=me@example.com"
    MachineKeySet = false
    KeyLength = 2048
    KeySpec = AT_KEYEXCHANGE
    HashAlgorithm = Sha1
    Exportable = true
    RequestType = Cert
    
    KeyUsage = "CERT_KEY_ENCIPHERMENT_KEY_USAGE | CERT_DATA_ENCIPHERMENT_KEY_USAGE"
    ValidityPeriod = "Years"
    ValidityPeriodUnits = "1000"
    
    [Extensions]
    %szOID_ENHANCED_KEY_USAGE% = "{text}%szOID_DOCUMENT_ENCRYPTION%"
    

    Just set the Subject to whatever you need.

    Then run:

    certreq -new MyCert.inf MyCert.cer
    

    This will generate the public key (X509 cert) and install it to your Current User personal store on the machine. You can export it from there if you want.

    I used this to generate a certificate for encrypting PowerShell DSC, for testing.

    For more details: https://technet.microsoft.com/en-us/library/dn296456.aspx#BKMK_New

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  • 2021-02-18 22:22

    MakeCert doesn't let you specify key usage, only extended key usage. I think you need a CA to create a broader certificate.

    You can setup your own CA with ubuntu server. https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-apache-for-ubuntu-14-04

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  • 2021-02-18 22:27

    You can use the -eku option to specify the key usage to your certificate.

    See details here: http://msdn.microsoft.com/en-us/library/aa386968(VS.85).aspx

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  • 2021-02-18 22:37

    Digital Signature,Data Encipherment and Key Encipherment can be add by using the PowerShell Cmdlet New-SelfSignedCertificate. One of the New-SelfSignedCertificate Parameters is KeyUsagewhere you can add DigitalSignature, DataEncipherment and KeyEncipherment.

    New-SelfSignedCertificate is described on technet (https://technet.microsoft.com/library/hh848633)

    Sample:

    New-SelfSignedCertificate -Type Custom -Subject "CN=sample.com" -KeyUsage DataEncipherment, KeyEncipherment, DigitalSignature -TextExtension @("2.5.29.37={text}1.3.6.1.5.5.7.3.2,1.3.6.1.5.5.7.3.1") -CertStoreLocation "Cert:\CurrentUser\My"
    

    The sample covers client authentication and server authentication and creates the certificate at the current user store under my.

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