xml-sec 0.1.10

Pure Rust XML Security: XMLDSig, XMLEnc, C14N. Drop-in replacement for libxmlsec1.
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//! XML Encryption (XMLEnc).
//!
//! Implements [XML Encryption Syntax and Processing](https://www.w3.org/TR/xmlenc-core1/).
//!
//! `EncryptedDataBuilder` encrypts opaque bytes, XML elements, XML content, or
//! a selected node in a caller-owned document. It supports direct AES content
//! keys and generated session keys wrapped independently for one or more
//! RSA-OAEP or AES-KW recipients. The reciprocal decrypt APIs accept the same
//! inline `CipherValue` profile.
//!
//! External `CipherReference` resources, RSA PKCS#1 v1.5 key transport, and
//! unauthenticated legacy ciphers are intentionally outside this profile.
#![doc = include_str!("../../docs/xmlenc.md")]

use roxmltree::Node;

mod decrypt;
mod encrypt;
mod parse;
mod types;

pub use decrypt::{
    DecryptionKeyResolver, DocumentDecryptionOptions, KekDecryptor, PrivateKeyDecryptor,
    SymmetricKeyDecryptor, decrypt, decrypt_data, decrypt_document, decrypt_document_with_options,
};
pub use encrypt::EncryptedDataBuilder;
pub use parse::parse_encrypted_data;
pub use types::{
    CipherData, DataEncryptionAlgorithm, DecryptedContent, DocumentEncryptionOptions,
    EncryptedData, EncryptedDataType, EncryptedKey, EncryptionMethod, EncryptionRecipient,
    EncryptionResult, KeyTransportAlgorithm, KeyWrapAlgorithm, OaepDigestAlgorithm, ReferenceList,
    ReplacementMode, RsaOaepParameters, XmlEncError,
};

fn has_single_element_with_boundary_trivia(parent: Node<'_, '_>) -> bool {
    let mut element_count = 0;
    for node in parent.children() {
        if node.is_element() {
            element_count += 1;
            if element_count > 1 {
                return false;
            }
        } else if node.is_comment() {
            continue;
        } else if node.is_text() {
            // XML permits boundary whitespace around a document element; processing
            // instructions and every other node kind are unsafe replacement payloads.
            if !node.text().is_some_and(|text| {
                text.chars()
                    .all(|character| matches!(character, ' ' | '\t' | '\n' | '\r'))
            }) {
                return false;
            }
        } else {
            return false;
        }
    }
    element_count == 1
}