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Summary of the Six Steps

32 RSA BSAFE Crypto-C Developer’s Guide

Summary of the Six Steps

A typical implementation uses the six steps as follows:

Step 0: Include

Include the necessary header files. In addition, make sure that:

• Your compiler can locate the Crypto-C header files.

• Your compiler can locate and link in the Crypto-C library.

• You compile and link in the file containing the definitions for the T_ functions; an

example is provided in

tstdlib.c.

Step 1: Create

Create an algorithm object by declaring a variable to be an algorithm object and

calling

B_CreateAlgorithmObject.

Step 2: Set

Use B_SetAlgorithmInfo to associate the algorithm object with an algorithm and to

supply any special information or parameters the algorithm requires.

Step 3: Init

Choose the operations the algorithm object can perform by supplying the desired

algorithm methods from the Crypto-C library. If the algorithm requires a key, create

and set a key object that will supply the key data that the algorithm needs.

Step 4: Update

Initiate an action. The action depends on the algorithm. Update is the only step that

can be performed more than once on the same object. For example:

• For an encryption or decryption algorithm, an Update step encrypts or decrypts

all or part of the data. You can use multiple Update steps to encrypt or decrypt

data.

• For a message digest, the Update step is used to enter the data to digest.

• For a random number generator, the Update step is used to seed the random

number generation.

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RSA Security Projection Television 5.2.2 Manual de usuario Pagina 54