Rust

Verify an XML Signature with Multiple References

See more XML Digital Signatures Examples

Demonstrates how to verify an XML digital signature that contains multiple references. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// An example of an enveloping XML signature with mulitple references is available at
// https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml

// This example will show how to verify the signature and all references, and also how
// to verify each reference individually.  This is useful to distinguish which part
// of the XML signature validation failed.  It could be that one or more of the references
// failed because of a hash computation mismatch.  Or it could be that the signature over
// the SignedInfo failed.  

// First, let's grab the sample XML signature.
let http = chilkat::Http::new();
let sb_xml = chilkat::StringBuilder::new();
if http.quick_get_sb("https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml", &sb_xml).is_err() {
    println!("{}", http.last_error_text());
    return;
}

// Load the XML containing the signature to be verified.
let verifier = chilkat::XmlDSig::new();
if verifier.load_signature_sb(&sb_xml).is_err() {
    println!("{}", verifier.last_error_text());
    return;
}

let mut verify_reference_digests = true;

// The quick way to validate all references and the signature over the SignedInfo
// is to call VerifySignature with verifyReferenceDigests equal to true.
let verified = verifier.verify_signature(verify_reference_digests).is_ok();
println!("Signature and all reference digests verified = {}", verified);

// Let's pretend the call to VerifySignature returned false.  Something did not validate.
// Was it one or more of the References that did not hash to the correct value?
// Or was it the signature over the SignedInfo that failed?
// We can check just the signature over the SignedInfo by passing false to VerifySignature.
// This allows us to skip the hashing and checking each Reference.  
verify_reference_digests = false;
let signed_info_verified = verifier.verify_signature(verify_reference_digests).is_ok();
println!("Neglecting the reference hashes, the SignedInfo validation result = {}", signed_info_verified);

// We can also verify each reference digest separately
let num_refs = verifier.num_references();
let mut i = 0;
while i < num_refs {
    let ref_digest_verified = verifier.verify_reference_digest(i);
    println!("Reference {} digest verified = {}", i, ref_digest_verified);
    i = i + 1;
}

// For this sample XML signature with 3 References, we get the following output:

// Signature and all reference digests verified = True
// Neglecting the reference hashes, the SignedInfo validation result = True
// Reference 0 digest verified = True
// Reference 1 digest verified = True
// Reference 2 digest verified = True