QueryKeySizeInBits

NAME

CSSM_QueryKeySizeInBits, CSP_QueryKeySizeInBits — Get CSP logical and effective sizes (CDSA)

SYNOPSIS

# include <cssm.h>

API:
CSSM_RETURN CSSMAPI CSSM_QueryKeySizeInBits
(CSSM_CSP_HANDLE CSPHandle,
CSSM_CC_HANDLE CCHandle,
const CSSM_KEY *Key,
CSSM_KEY_SIZE_PTR KeySize)
SPI:
CSSM_RETURN CSSMCSPI CSP_QueryKeySizeInBits
(CSSM_CSP_HANDLE CSPHandle,
CSSM_CC_HANDLE CCHandle,
const CSSM_CONTEXT *Context,
const CSSM_KEY *Key,
CSSM_KEY_SIZE_PTR KeySize)

LIBRARY

Common Security Services Manager library (cdsa$incssm300_shr.exe)

API PARAMETERS

`CSPHandle` (input/optional)
		The handle that describes the Cryptographic Service Provider module used to perform this function. For the API, this parameter is ignored if a valid cryptographic context handle is specified.
`CCHandle` (input/optional)
		A handle to a context that describes a cryptographic operation. The cryptographic context should contain a handle to the CSP that is being queried and the key about which key-size information is being requested.
`Key` (input/optional)
		A pointer to a CSSM_KEY structure containing the key about which key-size information is being requested. This parameter is ignored if a valid cryptographic context handle is specified.
`KeySize` (`output`)		Pointer to a CSSM_KEY_SIZE data structure. The logical and effective sizes (in bits) for the key are returned in this structure. For the API, if no context handle is provided, only the CSSM_KEY_SIZE `LogicalKeySizeInBits` field is set.

SPI PARAMETERS

Context (input)

Pointer to CSSM_CONTEXT structure that describes the attributes with this context.

DESCRIPTION

This function queries a Cryptographic Service Provider (CSP) for the logical and effective sizes of a specified key.

The Cryptographic Service Provider (handle) and the key can be specified either in the cryptographic context or as parameters to the function call. If a valid cryptographic context handle parameter is specified, the CSP handle and key parameters are ignored.

RETURN VALUE

A CSSM_RETURN value indicating success or specifying a particular error condition. The value CSSM_OK indicates success. All other values represent an error condition.

ERRORS

Errors are described in the CDSA Technical Standard.

CSSMERR_CSP_QUERY_SIZE_UNKNOWN

QueryKeySizeInBits

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