PS01041239: Numeric equivalents of constants defined by AspEncrypt type library

Article PS01041239

Numeric equivalents of constants defined by AspEncrypt type library

Problem Description

The AspEncrypt component's type library defines a number of constant identifiers (macros) that are to be used as arguments to various methods and properties. These constants designate various encryption algorithms, options, modes, etc. such as calgRC2 for RC2, calg3DES for Triple DES, etc. You must make sure these constants are properly defined, or use their numeric equivalents instead.

Solution

When AspEncrypt is used in VB, the AspEncrypt constants are automatically defined when you include Persits Software AspEncrypt in your project's References.
In the ASP environment, you must include the following tag in your code:

Otherwise these constans will be undefined, and will all evaluate to 0 which will cause errors such as
Invalid algorithm specified.
Invalid flags specified.
Certain other development environments are unable to retrieve the constants' numeric values from an object's type library. In this situation, you must not use the constant identifiers at all, and should replace them with their respective numeric equivalents. For example, instead of
Set key = Context.GenerateKeyFromPassword("pwd", calgSHA, calgRC4, 40)
you must write
Set key = Context.GenerateKeyFromPassword("pwd", 32772, 26625, 40)
The following table lists all constants and their numeric equivalents:

Constant Value

CryptoBlobTypes

cbtSimpleBlob 1

cbtPublicKeyBlob 6

cbtPrivateKeyBlob 7

cbtPlainTextBlob 8

CryptoCipherModes

ccmCBC 1

ccmECB 2

ccmOFB 3

ccmCFB 4

ccmCTS 5

CryptoCipherPadding

ccpPKCS5 1

ccpRandom 2

ccpZero 3

CryptoAlgorithms

catKeyExchange 1

catSignature 2

calgRC2 26114

calgRC4 26625

calgMD2 32769

calgMD4 32770

calgMD5 32771

calgSHA 32772

calgSHA256 32780

calgSHA384 32781

calgSHA512 32782

calgDES 26113

calg3DES 26115

calg3DES2 26121

calgAES128 26126

calgAES192 26127

calgAES256 26128

Related Articles

PS01032928 - Invalid flags specified/Invalid algorithm specified error when using strong encryption

Created: 2/8/2002 4:54:16 AM
Last Modified: 9/26/2005 1:21:19 PM
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