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Encryption/Decription using the windows CryptoAPI
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| Submitted on: |
2/1/2000 |
| By: |
Barry Dunne
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| Level: |
Beginner |
| User Rating: |
By 5 Users |
| Compatibility: |
C++ (general) |
| Views: |
24030 |
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(About the author) |
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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
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 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
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12/24/2000 4:35:57 AM: Philip Leitch
Try including your standard headder...
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1/18/2002 3:56:49 AM: Kerry
Thanks for your great code.
It works well but when have it encrypt the string line "1111111111111111111111111111111111111111111111111". the result of decryption is short than the source string.
any advice?
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10/15/2002 6:15:09 AM:
Hi,
I just like to ask if it is ANSI X9.8 or Diebold? I actually need of one these. Thanks.
Regards,
Cathy
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11/7/2004 12:58:40 PM: Bonj2
Excellent code, really simple yet sophisticated
Does it only work with ASCII characters for the password? I think there may be some issues with null-terminators being introduced if they are not, hence cutting the string short
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4/4/2006 5:43:22 PM: radar
nice code.... but it looks like it truncating the decryption.... any ideas?
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