AI_ECParameters
AI_ECParameters
Purpose:
This AI allows you to specify EC parameters to be used for elliptic curve operations.
Type of information this allows you to use:
information that was either generated by AI_ECParamGen or which has been imported from an external source. An algorithm object of type AI_ECParameters is initialized either as the resultAlgorithmObject from a call to B_GenerateParameters (AI_ECParamGen) or by simply calling B_SetAlgorithmInfo (AI_ECParameters or AI_ECParameters_BER).
The resulting AI_ECParameters algorithm object may then be used with AI_ECKeyGen to generate keys or with AI_EC_DHKeyAgree to execute key agreements.
Format of info supplied to B_SetAlgorithmInfo:
pointer to an A_EC_PARAMS structure:
typedef struct | { |
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unsigned int | version; |
| /* implementation version */ |
unsigned int | fieldType; |
| /* indicates type of base field */ |
ITEM | fieldInfo; | /* The prime number if fieldType = FT_FP; */ | |
| /* the basis polynomial if fieldType = FT_F2_POLYNOMIAL; */ | ||
| /* and the degree of the field if fieldType = FT_F2_ONB */ | ||
ITEM | coeffA; |
| /* elliptic curve coefficient */ |
ITEM | coeffB; |
| /* elliptic curve coefficient */ |
ITEM | base; |
| /* base point of elliptic curve */ |
ITEM | order; | /* order of subgroup’s generating element */ | |
ITEM | cofactor; |
| /* the cofactor of the subgroup */ |
unsigned int | pointRepresentation; | /* not used. */ | |
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| /* set to CI_NO_COMPRESS as a default */ |
unsigned int fieldElementBits; |
| /* field element size in bits */ | |
} A_EC_PARAMS; |
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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 | 73 |
