MD5 implementation

[Casper Hornstrup]

I need to use MD5 to generate a hash of a string. It needs to be
compatible with the MD5 implementation in PHP.

public string ComputeMD5(string plain)
{
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] bMD5Hash = Encoding.ASCII.GetBytes(plain);
return Encoding.ASCII.GetString(md5.ComputeHash(bMD5Hash) );
//return Convert.ToBase64String(md5.ComputeHash(bMD5Hash));
}


With PHP I get:
md5('test1test1test1test1test1test1') = '0b2fc97f2a37500552d805c4727295a8'

In .NET I get:
ComputeMD5('test1test1test1test1test1test1') = '/I*7PRXDrr('
ComputeMD5('test1test1test1test1test1test1') = 'Cy/Jfyo3UAVS2AXEcnKVqA=='
(base64)

Am I doing it wrong or are the PHP and .NET implementations not compatible?

Thanks in advance,
Casper Hornstrup

[Hernan de Lahitte]

Hi,

If you compare both hashes in the same encoding (the PHP version is in
Hexadecimal and the .NET version is in base64 or binary.), they will match.

--
Hernan de Lahitte
Lagash Systems S.A.
[url]http://www.lagash.com[/url]



"Casper Hornstrup" <msdn@csite.com> wrote in message
news:OZ$uuYw6DHA.1804@TK2MSFTNGP12.phx.gbl...

> I need to use MD5 to generate a hash of a string. It needs to be
> compatible with the MD5 implementation in PHP.
>
> public string ComputeMD5(string plain)
> {
> MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
> byte[] bMD5Hash = Encoding.ASCII.GetBytes(plain);
> return Encoding.ASCII.GetString(md5.ComputeHash(bMD5Hash) );
> //return Convert.ToBase64String(md5.ComputeHash(bMD5Hash));
> }
>
>
> With PHP I get:
> md5('test1test1test1test1test1test1') = '0b2fc97f2a37500552d805c4727295a8'
>
> In .NET I get:
> ComputeMD5('test1test1test1test1test1test1') = ' /I*7PRXDrr('
> ComputeMD5('test1test1test1test1test1test1') = 'Cy/Jfyo3UAVS2AXEcnKVqA=='
> (base64)
>
> Am I doing it wrong or are the PHP and .NET implementations not

compatible?

>
> Thanks in advance,
> Casper Hornstrup
>
>
>

[Casper Hornstrup]

Thanks for you answer.
How do I get a string in the .NET version that I can compare to the PHP
generated string and have a match?

Casper

"Hernan de Lahitte" <hernan@lagash.com> wrote in message
news:uLq9jnx6DHA.2404@TK2MSFTNGP12.phx.gbl...

> Hi,
>
> If you compare both hashes in the same encoding (the PHP version is in
> Hexadecimal and the .NET version is in base64 or binary.), they will

match.

>
> --
> Hernan de Lahitte
> Lagash Systems S.A.
> [url]http://www.lagash.com[/url]
>
>
>
> "Casper Hornstrup" <msdn@csite.com> wrote in message
> news:OZ$uuYw6DHA.1804@TK2MSFTNGP12.phx.gbl...

> > I need to use MD5 to generate a hash of a string. It needs to be
> > compatible with the MD5 implementation in PHP.
> >
> > public string ComputeMD5(string plain)
> > {
> > MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
> > byte[] bMD5Hash = Encoding.ASCII.GetBytes(plain);
> > return Encoding.ASCII.GetString(md5.ComputeHash(bMD5Hash) );
> > //return Convert.ToBase64String(md5.ComputeHash(bMD5Hash));
> > }
> >
> >
> > With PHP I get:
> > md5('test1test1test1test1test1test1') =

'0b2fc97f2a37500552d805c4727295a8'

> >
> > In .NET I get:
> > ComputeMD5('test1test1test1test1test1test1') = ' /I*7PRXDrr('
> > ComputeMD5('test1test1test1test1test1test1') =

'Cy/Jfyo3UAVS2AXEcnKVqA=='

> > (base64)
> >
> > Am I doing it wrong or are the PHP and .NET implementations not

> compatible?

> >
> > Thanks in advance,
> > Casper Hornstrup
> >
> >
> >

>
>

[Hernan de Lahitte]

This code will encode in Hexa your hashed byte array.

public static string EncodeHexString(byte[] sArray)
{
StringBuilder sb = new StringBuilder( sArray.Length * 2 );
for(int index = 0; index < sArray.Length; index++)
{
sb.AppendFormat( "{0:X2}", sArray[index] );
}
return sb.ToString();
}

--
Hernan de Lahitte
Lagash Systems S.A.
[url]http://www.lagash.com[/url]



"Casper Hornstrup" <msdn@csite.com> wrote in message
news:#Id1qyx6DHA.2044@TK2MSFTNGP10.phx.gbl...

> Thanks for you answer.
> How do I get a string in the .NET version that I can compare to the PHP
> generated string and have a match?
>
> Casper
>
> "Hernan de Lahitte" <hernan@lagash.com> wrote in message
> news:uLq9jnx6DHA.2404@TK2MSFTNGP12.phx.gbl...

> > Hi,
> >
> > If you compare both hashes in the same encoding (the PHP version is in
> > Hexadecimal and the .NET version is in base64 or binary.), they will

> match.

> >
> > --
> > Hernan de Lahitte
> > Lagash Systems S.A.
> > [url]http://www.lagash.com[/url]
> >
> >
> >
> > "Casper Hornstrup" <msdn@csite.com> wrote in message
> > news:OZ$uuYw6DHA.1804@TK2MSFTNGP12.phx.gbl...

> > > I need to use MD5 to generate a hash of a string. It needs to be
> > > compatible with the MD5 implementation in PHP.
> > >
> > > public string ComputeMD5(string plain)
> > > {
> > > MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
> > > byte[] bMD5Hash = Encoding.ASCII.GetBytes(plain);
> > > return Encoding.ASCII.GetString(md5.ComputeHash(bMD5Hash) );
> > > //return Convert.ToBase64String(md5.ComputeHash(bMD5Hash));
> > > }
> > >
> > >
> > > With PHP I get:
> > > md5('test1test1test1test1test1test1') =

> '0b2fc97f2a37500552d805c4727295a8'

> > >
> > > In .NET I get:
> > > ComputeMD5('test1test1test1test1test1test1') = ' /I*7PRXDrr('
> > > ComputeMD5('test1test1test1test1test1test1') =

> 'Cy/Jfyo3UAVS2AXEcnKVqA=='

> > > (base64)
> > >
> > > Am I doing it wrong or are the PHP and .NET implementations not

> > compatible?

> > >
> > > Thanks in advance,
> > > Casper Hornstrup
> > >
> > >
> > >

> >
> >

>
>