XML Security Library: XML Encryption

XML Security library supports the following features as defined in XML Encryption Syntax and Processing Version 1.1 (also see RFC 9231):

XMLSec Library core features

	Requirements	Status
Processing rules
Type parameter value: Element	Required	Yes
Type parameter value: Content	Required	Yes
Type parameter value: EXI	Optional	No
Encryption	Required	Yes
Decryption	Required	Yes
XML Encryption	Optional	Yes
Syntax
The EncryptedType Element	Required	Yes
The EncryptionMethodElement	Optional	Yes
The CipherData Element	Required	Yes
The CipherReference Element	Optional	Yes
The EncryptedData Element	Required	Yes
The EncryptedKey Element	Optional	Yes
The DerivedKey Element	Required	Yes ⁽²⁾
The ds:RetrievalMethod Element	Optional	Yes
The ReferenceList Element	Optional	Yes
The EncryptionProperties Element	Optional	Yes
Transforms
XML Canonicalization	See XMLDsig Report

XMLSec Cryptographic Libraries features

	Requirements	XMLSec with OpenSSL	XMLSec with NSS	XMLSec with GnuTLS	XMLSec with MSCng	XMLSec with MSCrypto ⁽¹⁾	XMLSec with GCrypt ⁽¹⁾
Block Encryption Algorithms
Triple DES (DES3)	Required	Yes	Yes	Yes	Yes	Yes	Yes
AES-CBC-128	Required	Yes	Yes	Yes	Yes	Yes	Yes
AES-CBC-192	Optional	Yes	Yes	Yes	Yes	Yes	Yes
AES-CBC-256	Required	Yes	Yes	Yes	Yes	Yes	Yes
AES-GCM-128	Required	Yes	Yes	Yes	Yes	Yes	No
AES-GCM-192	Optional	Yes	Yes	Yes	Yes	Yes	No
AES-GCM-256	Optional	Yes	Yes	Yes	Yes	Yes	No
Stream Encryption Algorithms	Optional	No	No	No	No	No	No
Key Derivation
ConcatKDF	Required	Yes ⁽³⁾ ⁽⁴⁾	No	No	Yes ⁽⁴⁾ ⁽⁵⁾	No	No
PBKDF2	Optional	Yes ⁽³⁾ ⁽⁶⁾	Yes ⁽⁶⁾	Yes ⁽⁶⁾	Yes ⁽⁵⁾ ⁽⁶⁾	No	No
Key Transport
RSA PKCS1 v1.5	Optional	Yes	Yes	Yes	Yes	Yes	Yes
RSA-OAEP (MGF1 with SHA1)	Required	Yes	Yes	No	Yes	Yes	Yes
RSA-OAEP with MGF1-SHA1	Optional	Yes	Yes	No	Yes ⁽⁷⁾	No	Yes ⁽⁷⁾
RSA-OAEP with MGF1-SHA224	Optional	Yes	Yes	No	No	No	Yes ⁽⁷⁾
RSA-OAEP with MGF1-SHA256	Optional	Yes	Yes	No	Yes ⁽⁷⁾	No	Yes ⁽⁷⁾
RSA-OAEP with MGF1-SHA384	Optional	Yes	Yes	No	Yes ⁽⁷⁾	No	Yes ⁽⁷⁾
RSA-OAEP with MGF1-SHA512	Optional	Yes	Yes	No	Yes ⁽⁷⁾	No	Yes ⁽⁷⁾
Key Agreement
Elliptic Curve Diffie-Hellman (ECDH)	Required	Yes ⁽³⁾	No	No	Yes ⁽⁵⁾	No	No
Diffie-Hellman with legacy KDF	Optional	No	No	No	No	No	No
Diffie-Hellman with explicit KDF	Optional	Yes ⁽³⁾ ⁽⁸⁾	No	No	No	No	No
Symmetric Key Wrap
Triple DES Key Wrap	Required	Yes	Yes	Yes	Yes	Yes	Yes
AES-128 KeyWrap	Required	Yes	Yes	Yes	Yes	Yes	Yes
AES-192 KeyWrap	Optional	Yes	Yes	Yes	Yes	Yes	Yes
AES-256 KeyWrap	Required	Yes	Yes	Yes	Yes	Yes	Yes
Message Digest
Message Digest Algorithms	See XMLDsig Report

⁽¹⁾ The feature is disabled by default but can be re-enabled at build time.
⁽²⁾ Some optional features in DerivedKey element are not supported (more details).
⁽³⁾ Requires OpenSSL 3.0.0 or greater.
⁽⁴⁾ Only byte-aligned bit strings in ConcatKDFParams element are supported (more details).
⁽⁵⁾ The xmlsec-mscng library does not support some cryptographic algortihms on Windows 8, Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP.
⁽⁶⁾ Only "specified" salt is supported for PBKDF2.
⁽⁷⁾ RSA-OAEP digest algorithm and MGF1 algorithm must be the same.
⁽⁸⁾ The xmlsec-openssl library only supports DHX (X9.42 format) keys for DH algorithm.

XML Encryption Interoperability Report

XMLSec Library core features

XMLSec Cryptographic Libraries features

Test vectors