Encryption/Decription using the windows Crypt

API,CSP,NULL,class,provides,through,CryptoAPI

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Encryption/Decription using the windows CryptoAPI

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Submitted on: 2/1/2000
By: Barry Dunne
Level: Beginner
User Rating:

By 5 Users
Compatibility:C++ (general)

Users have accessed this code 7135 times.

This class provides encryption/decryption through the CryptoAPI. This is the standard API you can use regardless of the underlying dll used to do the encryption. These dlls are called Cryptographic Service Providers (CSPs) and you get one as standard from Microsoft called "Microsoft Base Cryptographic Provider v1.0" This class uses the standard CSP, but this can be changed by changing the constant SERVICE_PROVIDER There is additional code in this class to ensure that the encrypted values do not contain CR or LF characters so that the result can be written to a file A word of warning: If you are going to use WritePrivateProfileString to write the encrypted value to an ini file, you must write a NULL first to delete the existing entry as it does not clear previous entries when writing binary data. This is a problem if you are overwriting a value with a smaller one.

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Other User Comments

10/5/2000 11:56:33 AM:Tomas Karlsson

I got a compiling error when trying 
this source: cryptography.cpp(371) : 
fatal error C1010: unexpected end of 
file while looking for precompiled 
header directive
Any 
ideas?
Regards,
Tomas

12/24/2000 4:35:57 AM:Philip Leitch

Try including your standard headder...

1/18/2002 3:56:49 AM:Kerry

Thanks for your great code.
It works 
well but when have it encrypt the 
string line 
"111111111111111111111111111111111111111
1111111111". the result of decryption 
is short than the source string.
any 
advice?

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