Wednesday Mar 04, 2015

Steps to create a .jks keystore from .pfx file

What are the different certificate extensions ?

How do they differ from each other ?

Common filename extensions for X.509 certificates are:

.pem – (Privacy-enhanced Electronic Mail) Base64 encoded DER certificate, enclosed between "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----"

.cer, .crt, .der – usually in binary DER form, but Base64-encoded certificates are common too.

If you have a .pem file (Base64) then you can directly rename the file to .cer / .crt and open the certificate in Windows to view its contents. ( by double clicking on the file ) 

.p7b, .p7c – PKCS#7 SignedData structure without data, just certificate(s) or CRL(s)

.p12 – PKCS#12, may contain certificate(s) (public) and private keys (password protected)

.pfx – PFX, predecessor of PKCS#12 (usually contains data in PKCS#12 format, e.g., with PFX files generated in IIS)

PKCS#7 is a standard for signing or encrypting (officially called "enveloping") data. Since the certificate is needed to verify signed data, it is possible to include them in the SignedData structure. A .P7C file is a degenerated SignedData structure, without any data to sign.

PKCS#12 evolved from the personal information exchange (PFX) standard and is used to exchange public and private objects in a single file.

 Source : http://en.wikipedia.org/wiki/X.509 

In this post we will see how to convert a pfx file to pem / JKS.....

[Read More]

Wednesday Dec 18, 2013

Steps to create a csr ( certificate signing request ) using keytool and get it signed from an external CA ( Certificate Authority - Thawte )

How to create a csr ?

How to get a certificate signed from an external / third party CA ?

How to create a certificate chain ?

-----------

 Defaults for keytool command in Java 1.6 :

-alias "mykey"

-keyalg

    "DSA" (when using -genkeypair)

    "DES" (when using -genseckey)

-keysize

    1024 (when using -genkeypair)

    56 (when using -genseckey and -keyalg is "DES")

    168 (when using -genseckey and -keyalg is "DESede")

-validity 90

In generating a public/private key pair, the signature algorithm (-sigalg option) is derived from the algorithm of the underlying private key: If the underlying private key is of type "DSA", the -sigalg option defaults to "SHA1withDSA", and if the underlying private key is of type "RSA", -sigalg defaults to "MD5withRSA".

-------------------------------------------

Defaults for keytool command in Java 1.7 :

-alias "mykey"

-keyalg

    "DSA" (when using -genkeypair)

    "DES" (when using -genseckey)

-keysize

    2048 (when using -genkeypair and -keyalg is "RSA")

    1024 (when using -genkeypair and -keyalg is "DSA")

    256 (when using -genkeypair and -keyalg is "EC")

    56 (when using -genseckey and -keyalg is "DES")

    168 (when using -genseckey and -keyalg is "DESede")

-validity 90

If the underlying private key is of type "DSA", the -sigalg option defaults to "SHA1withDSA"

If the underlying private key is of type "RSA", the -sigalg option defaults to "SHA256withRSA".

If the underlying private key is of type "EC", the -sigalg option defaults to "SHA256withECDSA".

 -------------------------------------------- 

The chaining can be of 2 types :

root……………………….ow = xxx

……………………………..is= xxx

inter ……………………… ow= xxx

………………………………is= yyy

signedcert……………….. ow= yyy

……………………………… is= ppp

and

signedcert ……………… ow= ppp

…………………………….. is= yyy

inter……………………… ow= yyy

…………………………….. is= xxx

root………………………. ow= xxx

…………………………….. is= xxx

In this post we will see how to create a csr and get it signed from a third party CA like Thawte...

[Read More]
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