×
Namespaces

Variants
Actions
Revision as of 13:05, 15 December 2011 by hamishwillee (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Symbian OS v9上信息摘要算法的实现(MD5/SHA1)

From Nokia Developer Wiki
Jump to: navigation, search
Article Metadata

文章
beover1984 在 09 Aug 2007 创建
最后由 hamishwillee 在 15 Dec 2011 编辑

在涉及安全方面的应用时我们通常都会用到数字签名技术,并且大多都是通过MD5或SHA1信息摘要算法实现,在Series 60 2nd及以前的版本没有公开这方面的API,我们只能按照RFC文档上的C语言算法实现进行移植, 当然移植起来并不困难.Symbian OS v9发布后使事情变得更简单了,它公开了一些安全方面的API,下面就以CMD5为例展示如何进行MD5信息摘要:

void GetMsgDigestByMd5L( TDes8 &aDest, const TDesC8 &aSrc )
{
_LIT8( KDigestFormat, "%02x" );
 
aDest.Zero();
 
CMD5 *md5 = CMD5::NewL();
CleanupStack ::PushL( md5 );
 
TPtrC8 ptrHash = md5->Hash( aSrc );
 
for( TInt i=0; i < ptrHash.Length(); i++ )
{
aDest.AppendFormat( KDigestFormat, ptrHash[i] );
}
 
CleanupStack::PopAndDestroy( md5 );
}

短短几行代码就完成了MD5信息摘要的功能,确实很简单吧:)当然我们还可以使用CMD5:: Update()不断增加信息内容以实现对大量数据的信息摘要功能.使用CMD5,我们需要包含头文件hash.h,并需要链接hash.lib,另外SHA1的实现方法和上面类似,只需把CMD5替换成CSHA1这个类就可以了.

This page was last modified on 15 December 2011, at 13:05.
93 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.

 

Thank you!

We appreciate your feedback.

×