SecVerifyTransformCreate(_:_:_:)

Declaration

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

Parameters

• key:

  A Seckey with the public key used for signing.

• signature:

  A Cfdata with the signature. This value may be NULL, and you may connect a transform to kSecTransformSignatureAttributeName to supply it from another signature.

• 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 verifies 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.