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certification verification using x509

I have been provided with X509 certificates in PEM format by interface system. they are sending byte of 256 length which they call it as public certificate. I need to verify this 256 bytes with X.509 ...
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3answers
2k views

Allowing the public to generate a CSR from your private key

As a hosting provider, I'd like to make the process of generating a certificate for a customer's domain as convenient as possible. I was pondering creating a webpage where anyone could: generate a ...
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0answers
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Migrate a x509 key using KSP (CNG) to CSP (CryptoAPI) in Windows

I have a code signing certificate issued to me by a commercial CA, and the key was generated on my local development machine using the new Cryptography Next Generation storage providers. ...
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1answer
44 views

Embed root certificate in software library

I am developing a network communication software library that uses handshaking similar to STARTTLS to enable upgrading to TLS security. I will be embedding a custom critical OIN policy into the ...
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2answers
120 views

How to be sure laptop's trusted certificates are safe

I have a Windows 8.1 Lenovo laptop. The evil Superfish app and certificate have been removed. My laptop has 36 certificates in certmgr.msc current user\third-party root certification ...
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1answer
39 views

Why there is a signed hash in Certificate request (.csr file)?

I wonder why there is a hash signed by private key in the CSR? It does prove that I have the private key that belongs to the public key in the .csr. But who cares whether I actually do possess the ...
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2answers
89 views

Can CA issue a certificate without CSR?

My question is if the CA can generate a private/public keypair on behalf of the requestor and sign it with its own private key? Is there any standard way or protocol to distribute such a ...
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0answers
20 views

Guidance on Login using Digital Signature DSC (PKCS12 and x509 certificate)

I'm interesting in exploring possibility to authenticate user using their Digital Certificate. The methodology is to first register the DSC from the user and keep their Public key along with Serial ...
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1answer
78 views

Generating x509 PEM files for testing PEM parser

I need to test a parser of PEM formatted certificates. Thus, I need to generate many variations including variations that are invalid for various reasons. Obviously I can use openssl or a library like ...
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1answer
34 views

Obtain X.509 Certificate Fingerprint from Certificate Info

I would like to obtain the SHA1/MD5 fingerprint of an X.509 certificate in order to compare it with the one presented by a server before connecting. However, I currently don't have access to the ...
2
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1answer
185 views

Openssl adding a telephone number or cell number to the distinguished_name

In the openssl.cnf file, I see fields like countryName, stateOrProvinceName etc which are typically present in the distinguished_name. Where can I get a list of fields which can be added to the ...
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2answers
53 views

Certificates - What about signing again Intermediate CA certificates?

I an thinking about this issue and it is hard to estimate technical impacts. For any relevant reasons, one want to modify one the x509 field of an intermediate CA. This intermediate CA was signed by ...
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2answers
572 views

Validating an SSL certificate chain according to RFC 5280: Am I understanding this correctly?

we're in the process of replacing certificates with SHA1 hash due to Google's move to let them appear less secure in Chrome. The replacement certificates use a different intermediate CA than the ones ...
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1answer
55 views

using commonName for DNS vs subjAltName

According to http://stackoverflow.com/a/26195101/569976#comment41093099_26195101 "[Using the DNS name as the common name is] deprecated by both the IETF and CA/B Forums, and it should not be done. ...
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2answers
78 views

How are “Certificate Signing” key usage certificates restricted to what domains they can sign?

Many big websites use their own intermediate signing certificates to generate SSL certificates for their domains. The intermediate certificates are issued by the usual root CAs but have a "Certificate ...
0
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1answer
46 views

Can I sign a new certificate with a previously paid for certificate [duplicate]

For the last few months, I have been using self signed certificates to provide ssl for a system that I have been building. We are now getting ready to start getting external users on the system, but ...
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1answer
307 views

Recommended Key Usage for a client certificate

My program has the following flow: a client sends a CSR to server, the server sends back a client certificate and after that the client communicate with the server to a path that requires a ...
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2answers
185 views

Can Subject Alternative Name(SAN) Certificate install on different Web Server or OS?

Let say: application.house.com apache tomcat : physical server email.house.com apache tomcat : virtual finance.house.com Oracle Wallet Manager : physical server ...
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2answers
2k views

Are certificate authorities required to obey to the signature algorithm (hashing) specified in the CSR?

I was playing a little bit with signature algorithms, trying to determine which CAs among the ones I use are currently issuing SHA2 certificates. I generated a CSR specifying the SHA256 hash (either ...
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1answer
84 views

Must the distinguished subject name of an issued SSL Certificate match that of the generated Certificate Signing Request?

For example: from Issued SSL Certificate: CN = abc.com.my, OU = Room, O = House, C = MY from generated CSR: CN = abc.com.my, OU = Room , O = House, L = KL, ST = KL , C = MY Is it legal for a ...
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2answers
4k views

This certificate has an invalid digital signature

I am trying to learn securing wcf service using ssl. I found this website and I am following the steps. ...
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1answer
700 views

x509 serial number - hex or decimal

When I run the openssl command openssl x509 -noout -text -in certname on different certs, on some I get a serial number which looks like this. Serial Number: 256 (0x100) On others, I get one ...
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0answers
103 views

1.3.6.1.5.5.7.1.12 Logotype extension - how can it be generated from openssl command line

If you look at this subCA Certificate from Verisign http://www.tbs-certificats.com/FAQ/en/495.html?p=en/495.html It has the following field 1.3.6.1.5.5.7.1.12: ...
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130 views

Openssl command line: How to get “Policy: X509v3 Any Policy” in a certificate I am generating through openssl

I am trying to generate a certificate through openssl which has the following line X509v3 Certificate Policies: Policy: X509v3 Any Policy But I end up getting X509v3 Certificate Policies: ...
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3answers
115 views

Generating deterministic X.509 certificates?

Is there a way to deterministically create an RSA private-key for an X.509 certificate, ideally through a library which has been vetted already? i.e. user enters some phrase like "this is my private ...
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1answer
76 views

CSR's with null bytes in them

According to wikipedia.org's article on X.509 certificates, "There are implementation errors with X.509 that allow e.g. falsified subject names using null-terminated strings Marlinspike Blackhat 2009 ...
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3answers
1k views

Creating an X.509 certificate with an invalid signature

Creating an X.509 certificate with a valid signature with OpenSSL is pretty well documented all over the Internet. There are instructions on creating certificates that are signed by themselves and ...
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2answers
337 views

Certificate authority structure - best practices

I'm working for a company that sells software products to customers some of which do not have the resources and/or know-how to build and maintain their own CA (used for the SSL communication of our ...
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1answer
388 views

Security weaknesses in using RSA encrypted MD5 hash of certificate content

Suppose you have an Internet banking site based on a secure web server running the HTTPS protocol via port 443. The server authenticates itself to clients through an X.509 certificate signed by a ...
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0answers
46 views

How to gather/verify certificate data with limited information (Issuer, Serial, CN)

I asked this question in the "programming" section, Here. However it may be a simple answer for someone familiar with the security of certificates. The basic premise is I have a large table with ...
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1answer
1k views

Determine if private key belongs to certificate?

Given a certificateĀ¹ and a private key fileĀ², how can I determine if the public key on the certificate matches the private key? My initial thought was to simply encrypt some text with the public key ...
2
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2answers
912 views

Load balancer and two machines - how many SSL certificates do I need?

We have a load balancer facing the Internet. It's balancing load towards two systems behind it in the back-end running apache. How many SSL certificates do I need to buy? - One for the load-balancer ...
2
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1answer
71 views

X509Certificate - How to set validation Policies?

I have an X509Certificate (say Certificate-A) for signing purpose. While validating this certificate, I have to check its path with Intermediate & Root certificate which I have implemented fully. ...
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1answer
41 views

OID for creation date/time (X509 certifcate field)

X509 certificates used in PKI{X} have notBefore and notAfter dates. I'd like to stamp a certifcate with a creation stamp, and the stamp is distinct from notBefore and notAfter. Is there an OID for a ...
5
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1answer
1k views

google certificates correct CA [closed]

I view certificates of https://www.google.com.ua/ So I thought, when requesting via cURL, if I point by CURLOPT_CAINFO to those certificates (GeoTrust Global CA and Google Internet Authority G2 in ...
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0answers
30 views

Specify port for cRLDistributionPoint?

cRLDistributionPoints is OID 2.5.29.31. Here's what one looks like under Gutmann's dumpasn1: SEQUENCE { OBJECT IDENTIFIER cRLDistributionPoints (2 5 29 31) OCTET STRING, encapsulates { ...
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2answers
77 views

Specify multiple ips in a certificate

I created an x509 certificate using gnu certtool, in the certificate template i specified cn=myip Problem is that each time I change my network I need to remake the certificate because my ip ...
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3answers
407 views

Why does the RFC 5280 dictate the CAs not to issue certificates with negative serial numbers?

I have tried to issue a certificate beginning with 8 to F but I have found it is impossible, mostly due to the RFC: The serial number MUST be a positive integer assigned by the CA to each ...
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2answers
1k views

Best way to set up SSL certificates for consuming web service from Azure

I need to purchase and install the correct Verisgin SSL certificate(s) (X.509) on Azure. I have never done this before and would really appreciate some advice on how to go about it and what is ...
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1answer
783 views

Private Key and Public Key Serial Number and Thumbprints

Are the private key Serial numbers and thumbprints the same as the corresponding public key Serial numbers and thumbprints for certificates (X509Certificates, Base64-encoded X.509), and are these good ...
2
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1answer
2k views

Root certificate key usage (non-self-signed end entity)

This discussion does not include self-signed end entity certificates for hosts like web servers and mail servers. OpenSSL's default configuration for a CA certificate has the following keyUsage: ...
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5answers
3k views

How to validate a client certificate

My understanding is that when using a client certificate for security one issues a private and public key cert (for example X509) of some sort and sends that of to the consumer of the service that one ...
2
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1answer
155 views

What do people mean by “top-down manner” in X.509 certificates?

What do people mean by saying that X.509 certificates work in "top-down manner"? Do they say that because CAs can do cross certifications?
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4answers
709 views

Trust a non-root CA in OpenSSL

Is it possible to have OpenSSL trust a non-root CA such that a certificate signed by that non-root CA can be properly verified? I've noticed that the default behavior for OpenSSL is to only verify ...