Chapter 2 Algorithm Info Types 77
AI_ECParametersBER
AI_ECParametersBER
Purpose:
This AI allows you to specify EC parameters to be used for elliptic curve operations.
Type of information this allows you to use:
the encoding of an ANSI X9.62 Version 1 algorithm identifier that specifies an elliptic
curve. An equivalent set of parameters to those produced by
AI_ECParamGen is
decoded and stored in the resulting algorithm object.
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 ITEM structure that contains the ANSI X9.62-compliant BER encoding of
an elliptic curve’s parameters. In compliance with X9.62, you can specify the
CHOICE of
either a full EC CURVE definition or a NAMED CURVE definition. Both ANSI X9.62
uncompressed and hybrid base points are decoded.
Format of info returned by B_GetAlgorithmInfo:
pointer to a ITEM structure that contains the ANSI X9.62-compliant BER encoding of
an elliptic curve’s parameters.
Crypto-C procedures to use with algorithm object:
B_SetAlgorithmInfo and B_GetAlgorithmInfo.
Algorithm methods to include in application’s algorithm chooser:
None.
Compatible representation:
AI_ECParameters.
Note: The X9.62 “NAMED CURVE” representation is not preserved when calling
B_GetAlgorithmInfo in AI_ECParameters. NAMED CURVE representation
