.NET hash/Cryptography newby question

[johnnyG]

Greetings,
I'm studying for the 70-330 Exam using the MS Press book by Tony Northrup
and there are 2 side-by-side examples of using the SHA1CryptoServi ceProvider
to create a hash value from a string.
The vb example outputs "A94A8FE5CCB19B A61C4C0873D391E 987982FBBD3"
The cs example outputs "5BAA61E4C9B93F 3F0682250B6CF83 31B7EE68FD8"
for the string "password"
Question: do the 2 applications use different automatic "salts" or "seeds"
to generate the hash? More specifically, why are they different? Is there no
single SHA1 hash for the string "password"?
I know these are newby questions, but I'm having diffculty getting my head
around what exactly is going on with the hash process...

I'll include the source code for both programs...

// cs version
------------------------------------------------------------------------
SHA1CryptoServi ceProvider myHash=new SHA1CryptoServi ceProvider();
byte[] password = Encoding.ASCII. GetBytes("passw ord");
myHash.ComputeH ash(password);
foreach (byte thisByte in myHash.Hash)
Console.Write(t hisByte.ToStrin g("X2"));

Console.WriteLi ne();

//-----------------------------------------------------------------------------------

' vb version
------------------------------------------------------------------------

Dim myHash As SHA1CryptoServi ceProvider = New
SHA1CryptoServi ceProvider

Dim bytePassword As Byte() = Encoding.ASCII. GetBytes("passw ord")
myHash.ComputeH ash(bytePasswor d)

For Each thisByte As Byte In myHash.Hash
Console.Write(t hisByte.ToStrin g("X2"))
Next

'---------------------------------------------------------------------------------------
Any help in understainding greatly appreciated...I 'm sitting for the exam
this Friday the 10th
jg

[Jeroen Vandezande]

"johnnyG" <jo*****@discus sions.microsoft .com> wrote in message
news:70******** *************** ***********@mic rosoft.com...

Greetings,
I'm studying for the 70-330 Exam using the MS Press book by Tony Northrup
and there are 2 side-by-side examples of using the
SHA1CryptoServi ceProvider
to create a hash value from a string.
The vb example outputs "A94A8FE5CCB19B A61C4C0873D391E 987982FBBD3"
The cs example outputs "5BAA61E4C9B93F 3F0682250B6CF83 31B7EE68FD8"
for the string "password"
Question: do the 2 applications use different automatic "salts" or "seeds"
to generate the hash? More specifically, why are they different? Is there
no
single SHA1 hash for the string "password"?
I know these are newby questions, but I'm having diffculty getting my head
around what exactly is going on with the hash process...

This is very strange...
I recreated the program in Chrome for .net 2.0:

class method ConsoleApp.Main ;
begin
var myHash := new System.Security .Cryptography.S HA1CryptoServic eProvider;
var password := System.Text.Enc oding.ASCII.Get Bytes('password ');
myHash.ComputeH ash(password);
for thisByte: Byte in myHash.Hash do
begin
Console.Write(t hisByte.ToStrin g('X2'));
end;
Console.WriteLi ne;
end;

this is the result:
5BAA61E4C9B93F3 F0682250B6CF833 1B7EE68FD8
The same as the C# program...

I wonder why the VB.net app is outputting an other hashcode...

Regards,

Jeroen Vandezande

[johnnyG]

oops..."A94A8FE 5CCB19BA61C4C08 73D391E987982FB BD3" is the hash for "test" not
"password"...I' m shot...thanks for your help...

Due to your research I am now confident that strings always hash to the same
value when the same hash algo is used.

"johnnyG" wrote:

Greetings,
I'm studying for the 70-330 Exam using the MS Press book by Tony Northrup
and there are 2 side-by-side examples of using the SHA1CryptoServi ceProvider
to create a hash value from a string.
The vb example outputs "A94A8FE5CCB19B A61C4C0873D391E 987982FBBD3"
The cs example outputs "5BAA61E4C9B93F 3F0682250B6CF83 31B7EE68FD8"
for the string "password"
Question: do the 2 applications use different automatic "salts" or "seeds"
to generate the hash? More specifically, why are they different? Is there no
single SHA1 hash for the string "password"?
I know these are newby questions, but I'm having diffculty getting my head
around what exactly is going on with the hash process...

I'll include the source code for both programs...

// cs version
------------------------------------------------------------------------
SHA1CryptoServi ceProvider myHash=new SHA1CryptoServi ceProvider();
byte[] password = Encoding.ASCII. GetBytes("passw ord");
myHash.ComputeH ash(password);
foreach (byte thisByte in myHash.Hash)
Console.Write(t hisByte.ToStrin g("X2"));

Console.WriteLi ne();

//-----------------------------------------------------------------------------------

' vb version
------------------------------------------------------------------------

Dim myHash As SHA1CryptoServi ceProvider = New
SHA1CryptoServi ceProvider

Dim bytePassword As Byte() = Encoding.ASCII. GetBytes("passw ord")
myHash.ComputeH ash(bytePasswor d)

For Each thisByte As Byte In myHash.Hash
Console.Write(t hisByte.ToStrin g("X2"))
Next

'---------------------------------------------------------------------------------------
Any help in understainding greatly appreciated...I 'm sitting for the exam
this Friday the 10th
jg