Module transforms 

Transform pipeline for XMLDSig <Reference> processing.

Implements XMLDSig §6.6: each <Reference> specifies a chain of transforms applied sequentially to produce bytes for digest computation.

The pipeline is a simple Vec<Transform> iterated front-to-back — a dramatic simplification of xmlsec1’s bidirectional push/pop doubly-linked list with auto-inserted type adapters.

Supported transforms

Transform	Direction	Priority
Enveloped signature	NodeSet → NodeSet	P0 (SAML)
Inclusive C14N 1.0/1.1	NodeSet → Binary	P0
Exclusive C14N 1.0	NodeSet → Binary	P0
Base64 decode	NodeSet/Binary → Binary	P1
XPath 1.0	NodeSet → NodeSet	P1
XPath Filter 2.0	NodeSet → NodeSet	P1

Structs

XPathExpression

An XPath 1.0 expression and the namespace bindings in scope where it was declared.

XPathFilter

One expression and set operation in an XPath Filter 2.0 transform.

Enums

Transform

A single transform in the pipeline.

XPathFilterOperation

Set operation applied by one XPath Filter 2.0 step.

XPathHereSemantics

Node returned by the XMLDSig XPath here() extension function.

Constants

BASE64_TRANSFORM_URI

The algorithm URI for the Base64 decode transform.

DEFAULT_IMPLICIT_C14N_URI

The implicit default canonicalization URI applied when no explicit C14N transform is present in a <Reference>.

ENVELOPED_SIGNATURE_URI

The algorithm URI for the enveloped signature transform.

MAX_TRANSFORMS_PER_REFERENCE

Maximum transforms accepted for one reference.

XPATH_FILTER2_TRANSFORM_URI

The algorithm URI for the XPath Filter 2.0 transform.

XPATH_TRANSFORM_URI

The algorithm URI for the XPath 1.0 transform.

Functions

execute_transforms

Execute a chain of transforms for a single <Reference>.

parse_transforms

Parse a <Transforms> element into a Vec<Transform>.