AI_ECParamGen
AI_ECParamGen
Purpose:
This AI allows you to generate EC parameters to be used for elliptic curve operations.
Type of information this allows you to use:
the input parameters for generating an elliptic curve system as defined in X9.62 and IEEE P1363 Draft.
Format of info supplied to B_SetAlgorithmInfo:
pointer to a B_EC_PARAM_GEN_PARAMS structure:
typedef struct | { |
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unsigned int | version; |
| /* implementation version */ | |
unsigned int | fieldType; |
| /* base field for the elliptic curve */ | |
unsigned int | fieldElementBits; | /* length of field element in bits */ | ||
unsigned int | compressIndicator; | /* ignored for now */ | ||
unsigned int | minOrderBits; | /* minimum size of group generated by base */ | ||
| /* input of 0 defaults to fieldElementBits - 7 */ | |||
unsigned int | trialDivBound; | /* maximum size of second largest prime */ | ||
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| /* | subgroup of group generated by base | */ |
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| /* input of 0 defaults to 255 | */ |
unsigned int | tableLookup; |
| /* characteristic 2 only. Set if the */ | |
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| /* | use of precomputed params is desired */ | |
}B_EC_PARAM_GEN_PARAMS;
Set the arguments as follows:
Argument | Values | Comments |
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version | 0 | Only value currently available; allows |
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| growth for future versions |
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fieldType | FT_FP | odd prime field |
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| FT_F2_ONB | even characteristic, optimal normal |
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| basis |
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| FT_F2_POLYNOMIAL | even characteristic, polynomial basis |
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compressIndicator | CI_NO_COMPRESS | do not compress the base or public key |
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C h a p t e r 2 A l g o r i t h m I n f o Ty p e s | 79 |
