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Chapter 9
Putting It All Together:
An X9.31 Example
The example in this chapter shows how to perform RSA digital signing and verifying
according to the ANSI X9.31 standard. This example, available on the CD-ROM as
x931.c, includes the following separate operations:
• Generate random input using
AI_X931Random
.
AI_X931Random
is a special-purpose
AI that generates the six separate streams of randomness required by the X9.31
standard.
• Generate an RSA key pair using AI_RSAStrongKeyGen. AI_RSAStrongKeyGen
generates RSA moduli that are in conformance with the strength criteria of ANSI
X9.31.
• Sign a message using AI_SignVerify. AI_SignVerify is an AI for performing RSA
signing and verification in conformance with the ANSI X9.31 standard.
• Verify a message using AI_SignVerify.
If you wish to create an application in accordance with the ANSI X9.31 standard, you
should use the AIs shown in this example. Although there are other AIs that appear to
give the same functionality (for example, other AIs for RSA signing and verification),
only the AIs listed above give you ANSI X9.31 standards compliance for RSA digital
signatures and verification. Compliance with this standard may be required for
contracts with certain United States Federal Government departments.