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Chapter 2 Algorithm Info Types 49
AI_DHParamGen
AI_DHParamGen
Purpose:
This AI allows you to generate Diffie-Hellman system parameters, which are the
prime modulus, base, and private value length.
Type of information this allows you to use:
the parameters for generating Diffie-Hellman system parameters as defined in PKCS
#3, where the size of the prime modulus and random exponent are specified. The
optimized generating algorithm is proprietary, as defined by RSA Security Inc.
Format of info supplied to B_SetAlgorithmInfo:
pointer to an A_DH_PARAM_GEN_PARAMS structure:
The
exponentBits
must be less than
primeBits
.
Format of info returned by B_GetAlgorithmInfo:
pointer to an A_DH_PARAM_GEN_PARAMS structure (see above).
Crypto-C procedures to use with algorithm object:
B_GenerateInit and B_GenerateParameters. B_GenerateParameters sets the
resultAlgorithmObject
with the AI_DHKeyAgree information. You must pass an
initialized random algorithm to
B_GenerateParameters.
Algorithm methods to include in application’s algorithm chooser:
AM_DH_PARAM_GEN.
typedef struct {
unsigned int primeBits; /* size of prime modulus in bits */
unsigned int exponentBits; /* size of random exponent in bits */
} A_DH_PARAM_GEN_PARAMS;