objc2_security

Function SecDigestTransformCreate

Source 
pub unsafe extern "C-unwind" fn SecDigestTransformCreate(
    digest_type: Option<&CFType>,
    digest_length: CFIndex,
    error: *mut *mut CFError,
) -> CFRetained<SecTransform>
👎Deprecated: SecTransform is no longer supported
Available on crate features SecDigestTransform and SecTransform only.
Expand description

Creates a digest computation object.

Parameter digestType: The type of digest to compute. You may pass NULL for this parameter, in which case an appropriate algorithm will be chosen for you.

Parameter digestLength: The desired digest length. Note that certain algorithms may only support certain sizes. You may pass 0 for this parameter, in which case an appropriate length will be chosen for you.

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

Returns: A pointer to a SecTransformRef object. This object must be released with CFRelease when you are done with it. This function will return NULL if an error occurred.

This function creates a transform which computes a cryptographic digest.