ObtainPrivateKeyFromPublicKey

NAME

CSSM_CSP_ObtainPrivateKeyFromPublicKey, CSP_ObtainPrivateKeyFromPublicKey — Convert public key to private key (CDSA)

SYNOPSIS

# include <cssm.h>

API:
CSSM_RETURN CSSMAPI CSSM_CSP_ObtainPrivateKeyFromPublicKey
(CSSM_CSP_HANDLE CSPHandle
const CSSM_KEY *PublicKey,
CSSM_KEY_PTR PrivateKey)
SPI:
CSSM_RETURN CSSMCSPI CSP_ObtainPrivateKeyFromPublicKey
(CSSM_CSP_HANDLE CSPHandle,
const CSSM_KEY *PublicKey,
CSSM_KEY_PTR PrivateKey)

LIBRARY

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

PARAMETERS

`CSPHandle` (`input`)
		The handle that describes the module to perform this operation.
`PublicKey` (`input`)
		The public key corresponding to the private key being sought.
`PrivateKey` (`output`)
		A reference to the private key corresponding to the public key.

DESCRIPTION

Given a public key this function returns a reference to the private key. The private key and its associated passphrase can be used as an input to any function requiring a private key value.

NOTES

The KeyData field of the CSSM_KEY structure is allocated by the CSP. The application is required to free this memory using the CSSM_FreeKey() (CSSM API), or CSP_FreeKey() (CSP SPI), function or with the memory functions registered for the CSPHandle.

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_PRIVATE_KEY_NOT_FOUND

ObtainPrivateKeyFromPublicKey

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