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SecSignTransformCreate(_:_:)

Creates a signing transform object.

Declaration

func SecSignTransformCreate(_ key: SecKey, _ error: UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecTransform?

Parameters

  • key:

    A Seckey with the private key used for signing.

  • error:

    A pointer to a Cferror. This pointer will be set if an error occurred. This value may be NULL if you do not want an error returned.

Return Value

A pointer to a new transform or NULL on error. In Objective-C, call the CFRelease function to free this object’s memory when you are done with it.

Discussion

This function creates a transform which computes a cryptographic signature. The kSecInputIsAttributeName attribute defaults to kSecInputIsPlainText, and the kSecDigestTypeAttribute and kSecDigestLengthAttribute attributes default to something appropriate for the type of key you have supplied.