[android-developers] Android - how to handle saving file on low device memory(Internal/External memory)

[sumit gulati]

How we can handle the file saving on low device memory(internal/Excternal 
memrory). I know if sufficient space is not available the OS will throw 
IOException but is there any way to handle this gracefully. Also if the 
file size is not known before saving file then how can we handle low memory 
scenario? 

Is there any need to handle the same by checking filespace before saving 
file or catch IOException. What is best practice for some data centric 
applications?

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[android-developers] How can I call WCF webservices with WS-security using client x509 certificate

[sumit gulati]

How can I consume the WCF webservices(hosted on http protocol) having ws- 
message security from the android application using KSOAP or any other 
library. I have implemented the same fro REST webservices. I have to 
customize the both trust manager(certificate file with X509 certificate) 
and key manager(.p2 file). There is transport security only message 
security. and url is with http scheme.

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[android-developers] Re: Mutual authentication using X.509 certificate

[sumit gulati]

If you have done please provide me the code or reference. I have to 
implement the same.

On Wednesday, February 29, 2012 11:45:47 AM UTC+5:30, Pankaj wrote:
>
> I want to consume WCF web-service which uses X.509 certificate for 
> mutual authentication. I had imported certificates using keytools in 
> BKS keystore & able to use in android code. Now for mutual 
> authentication i need to create web-request which have message digest 
> & signature in it 
>
> I am using KSOAP 2. MY android Application working fine till my client 
> is using https using srever side certificate. 
> But now my client want X.509 certificate based mutual authentication. 
> For which I need to form my request as per below mention format which 
> i had extracted using wireshark (client is developed in Visual studio 
> 8 which is working fine). 
>
> As per the blogs & articles i need to create message digest then 
> create signature but before creating message digest i need to create 
> XML canonicalization 
>
> Referenced Urls : 
> http://java.sun.com/developer/technicalArticles/xml/dig_signatures/ 
>
> http://docs.oracle.com/javase/6/docs/technotes/guides/security/xmldsig/XMLDigitalSignature.html
>  
> http://java.sun.com/developer/technicalArticles/xml/dig_signature_api/ 
>
> http://svn.apache.org/repos/asf/santuario/xml-security-java/trunk/samples/javax/xml/crypto/dsig/samples/GenEnveloped.java
>  
> http://www.xml.com/pub/a/ws/2002/09/18/c14n.html?page=1 
> http://www.w3.org/TR/2000/CR-xmldsig-core-20001031/ 
>
>  
> http://docs.oasis-open.org/wss/2004/01/ 
> oasis-200401-wss-wssecurity-secext-1.0.xsd"
>  
> s:mustUnderstand="1"> 
>  
> 2012-02-21T04:45:06.429Z 
> 2012-02-21T04:50:06.429Z 
>  
> http://docs.oasis-open.org/wss/ 
> 2004/01/ 
> oasis-200401-wss-x509-token-profile-1.0#X509v3"
>  
> EncodingType="http:// 
> docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message- 
> security-1.0#Base64Binary">
>  
>
> MIICbzCCAdygAwIBAgIQfjyZ229iN4tAbV0fiYiVyTAJBgUrDgMCHQUAMD8xPTA7BgNVBAMTNGNsaWVudC5iNTRiYTFkN2U2NzY0ZDdkOWRiMDA3YTgyNmM5ZGE5Ny5jbG91ZGFwcC5uZXQwHhcNMTIwMjE2MTY0MjI1WhcNMzkxMjMxMjM1OTU5WjA/
>  
>
> MT0wOwYDVQQDEzRjbGllbnQuYjU0YmExZDdlNjc2NGQ3ZDlkYjAwN2E4MjZjOWRhOTcuY2xvdWRhcHAubmV0MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDRW
>  
>
> +Di90XDGulLybdBboUlOilxvbcnfow+NhoNW80uNjmGQiQpxP0oNnYT7RKJ 
> +nP3+sZxUfRfazLgvOTFn0F9SIFQ9T4I5LNFMHhDfExoT0k/ 
> aeF870Euy07BiwF7eXw6toSv1dKwKavq20szbIr/NeabIEDS/GzKY6P0/ 
> TOQfwIDAQABo3QwcjBwBgNVHQEEaTBngBCNb6YOYI3RBR64WvVUjQtPoUEwPzE9MDsGA1UEAxM0Y2xpZW50LmI1NGJhMWQ3ZTY3NjRkN2Q5ZGIwMDdhODI2YzlkYTk3LmNsb3VkYXBwLm5ldIIQfjyZ229iN4tAbV0fiYiVyTAJBgUrDgMCHQUAA4GBAG5v1DZmXQKcaxNzz2VYDZ8aYYrYRQwU4lrBKlI0CnrkcZwQGPmRxdkiET9D91kcN/
>  
>
> fmq90nj1F5FZoqhzeT1moqGKXKT9HRX8j6Ln1QDhsr+0JfgJW9/ 
> IFaQI14xKwr8bw4+DxIyp0IMpSw9biULmIQ1QuTzfKDEowlcQhsik+E 
>  
> http://www.w3.org/2000/09/xmldsig#";> 
>  
> http://www.w3.org/2001/10/xml-exc- 
> c14n#"/> 
> http://www.w3.org/2000/09/xmldsig#rsa- 
> sha1 "/> 
>  
>  
> http://www.w3.org/2001/10/xml-exc-c14n#"/> 
>  
> http://www.w3.org/2000/09/xmldsig#sha1"/> 
> Soj1m/E157CempDHHC6c6gZBd1E= 
>  
>  
>  
> kqsIYUc3uYoQpuWVWYOio4KcGpon+3wDDhsAzVgZVljQxEhF7z1JS/ 
> qzw9ELYCn2JbYIkWMtEeYfXRtPvjrPM1fjJiqbXSKq7jHEeVtMQnOytAHRL1ZFA 
> +dLq4spJQR7uYnmJ1lmgQnu1kYcteSmD29Xm5e5dPUnz4yap3p7zC4= 
>  
>  
>  
> http://docs.oasis-open.org/wss/2004/01/ 
> oasis-200401-wss-x509-token-profile-1.0#X509v3"
>  
> URI="#uuid- 
> e35f5271-3c4e-47c7-ba34-8d995e414ba3-1"/> 
>  
>  
>  
>  
>  
>
> But to create message digest we need perform XML canonicalization with 
> "http://www.w3.org/2001/10/xml-exc-c14n#"; transform algorithm. I am 
> not able to found any API or library which perform above task. 
>
> I had used xmlsec jar but I guess it is not supported by android and 
> also used all the option which I found after googling. 
>
> I had find out that android don’t have support of following JAVA 
> packages: 
> •javax.xml.crypto.dom 
> •javax.xml.crypto.dsig 
> •javax.xml.crypto.dsig.dom 
> •javax.xml.crypto.dsig.keyinfo 
> •javax.xml.crypto.dsig.spec 
>
>
> Please guide me how to call WCF web-service which involve X.509 
> certificate based mutual authentication. ASAP

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