SHA1 Algorithms Source code in C#

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C#3.5

Please give me a SHA1 Source code which will encrypt/decrypt a file.source code must be in C#3.5

Posted 7-Apr-11 20:56pm

GaneshKale22

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Sandeep Mewara 8-Apr-11 3:31am

No effort.

3 solutions

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OriginalGriff · Accepted Answer · 2011-04-07T21:05:00

Solution 1

SHA will not "encrypt/decrypt a file".

It is not an encryption algorithm.

It is a Hashing algorithm.

If you generate a SHA from a file, you cannot get the file back from the SHA value. At all. Ever. Period.

Did you really think that a 5Mb file could be "encrypted" into 128 bits, and then "decrypted" back to 5Mb, all without any encryption key?

Look instead at using TripleDES or similar depending on your application.

Posted 7-Apr-11 21:05pm

OriginalGriff

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Manfred Rudolf Bihy 8-Apr-11 3:07am

Agreed! 5+

Kim Togo 8-Apr-11 7:40am

Total correct :-), my 5

Sergey Alexandrovich Kryukov 9-Apr-11 0:02am

Agreed. A 5.
--SA

Michel [mjbohn] · Accepted Answer · 2011-04-07T21:11:00

Solution 3

You can't use SHA for encrytion because it's just for hashing.
Have a look at TDES or RSA. C# has CryptoProvider for both.

Posted 7-Apr-11 21:11pm

Michel [mjbohn]

Comments

Manfred Rudolf Bihy 8-Apr-11 3:14am

Correct! 5+

Michel [mjbohn] 9-Apr-11 2:10am

thanks :)

Kim Togo 8-Apr-11 7:41am

Correct :-)

Michel [mjbohn] 9-Apr-11 2:10am

thanks :)

Sergey Alexandrovich Kryukov 9-Apr-11 0:02am

This is also an excellent answer, especially it offers the best alternative. I voted "Excellent mark".
--SA

Michel [mjbohn] 9-Apr-11 2:10am

thanks :)

Manfred Rudolf Bihy · Accepted Answer · 2011-04-07T21:05:00

Solution 2

SHA1[^] is a hash algorithm and eventhough this can be used to create an encryption algorithm like SHACAL[^] for instance this is not what you asked in your question. This having been said I advise you to reformulate your question so that we can really help you. The question is as it stands plain wrong.

Regards,

-MRB

Posted 7-Apr-11 21:05pm

Manfred Rudolf Bihy

Updated 7-Apr-11 21:06pm

v2

Comments

Nuri Ismail 8-Apr-11 3:44am

Good advise, my 5.

Sergey Alexandrovich Kryukov 9-Apr-11 0:01am

This is the best Answer as it points to pseudo-code (even better than code to my taste), so I vote 5.
--SA