XMLEncrypt Class

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The XMLEncrypt class is used to encrypt and decrypt XML.

Syntax

class ipworksencrypt.XMLEncrypt

Remarks

The XMLEncrypt class provides a simple API for encrypting and decrypting XML. The encrypt method will encrypt the XML document, or a specific element. Multiple elements may be encrypted at one time by setting the EncryptedDataDetail* properties. The decrypt method will decrypt the XML document.

The class supports encrypting and decrypting with a shared symmetric_key, and also using asymmetric encryption to encrypt the symmetric_key (session key) via the RecipientCert* and Cer* properties.

Encrypt

To begin first specify a XML document by setting input_file, or input_xml.

The EncryptedDataDetail* properties specify the XML element to encrypt. By default the entire XML document is encrypted.

The symmetric_key property specifies the key which will be used to encrypt the data.

If the RecipientCert* properties are set, then the symmetric_key will be encrypted and included in the encrypted data. This allows for the recipient to decrypt the key, with their certificate. Encrypting the symmetric key is also referred to as using a session key. The benefit of using certificate to encrypt and decrypt a session key (symmetric_key) is that knowledge of the key value is not needed ahead of time to process the encrypted data. Note that if specified, recipient_cert MUST have a RSA key, not a DSA key.

If the RecipientCert* properties are not set, then the recipient must know the value of symmetric_key before decrypting the XML. The KeyName setting may be set to provide a key identifier to the recipient.

Optionally set encrypting_algorithm, and then call encrypt to encrypt the XML.

The following properties are applicable when calling this method:

• symmetric_key (required)
• encrypting_algorithm
• EncryptedDataDetail*
• RecipientCert*
• KeyName

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

Decrypt

To begin first specify a XML document by setting input_file, or input_xml.

The symmetric_key property specifies the key used to decrypt the data. This may be set before calling decrypt or inside the on_encrypted_data_info event. The on_encrypted_data_info event fires once for each encrypted element when decrypt is called.

If the data was encrypted using an session key, set the Cert* properties to the certificate with private key before calling decrypt. The certificate will be used to decrypt the encrypted session key. In this case the symmetric_key property is ignored.

The following properties are applicable when calling this method:

• symmetric_key
• certificate

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

Property List

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The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

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The following is a list of config settings for the class with short descriptions. Click on the links for further details.

cert_encoded Property

This is the certificate (PEM/Base64 encoded).

Syntax

def get_cert_encoded() -> bytes: ...
def set_cert_encoded(value: bytes) -> None: ...

cert_encoded = property(get_cert_encoded, set_cert_encoded)

Default Value

""

Remarks

This is the certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The cert_store and cert_subject properties also may be used to specify a certificate.

When cert_encoded is set, a search is initiated in the current cert_store for the private key of the certificate. If the key is found, cert_subject is updated to reflect the full subject of the selected certificate; otherwise, cert_subject is set to an empty string.

cert_store Property

This is the name of the certificate store for the client certificate.

Syntax

def get_cert_store() -> bytes: ...
def set_cert_store(value: bytes) -> None: ...

cert_store = property(get_cert_store, set_cert_store)

Default Value

"MY"

Remarks

This is the name of the certificate store for the client certificate.

The cert_store_type property denotes the type of the certificate store specified by cert_store. If the store is password protected, specify the password in cert_store_password.

cert_store is used in conjunction with the cert_subject property to specify client certificates. If cert_store has a value, and cert_subject or cert_encoded is set, a search for a certificate is initiated. Please see the cert_subject property for details.

Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

cert_store_password Property

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Syntax

def get_cert_store_password() -> str: ...
def set_cert_store_password(value: str) -> None: ...

cert_store_password = property(get_cert_store_password, set_cert_store_password)

Default Value

""

Remarks

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

cert_store_type Property

This is the type of certificate store for this certificate.

Syntax

def get_cert_store_type() -> int: ...
def set_cert_store_type(value: int) -> None: ...

cert_store_type = property(get_cert_store_type, set_cert_store_type)

Default Value

0

Remarks

This is the type of certificate store for this certificate.

The class supports both public and private keys in a variety of formats. When the cstAuto value is used, the class will automatically determine the type. This property can take one of the following values:

cert_subject Property

This is the subject of the certificate used for client authentication.

Syntax

def get_cert_subject() -> str: ...
def set_cert_subject(value: str) -> None: ...

cert_subject = property(get_cert_subject, set_cert_subject)

Default Value

""

Remarks

This is the subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the property is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are as follows:

If a field value contains a comma, it must be quoted.

encrypted_data_detail_count Property

The number of records in the EncryptedDataDetail arrays.

Syntax

def get_encrypted_data_detail_count() -> int: ...
def set_encrypted_data_detail_count(value: int) -> None: ...

encrypted_data_detail_count = property(get_encrypted_data_detail_count, set_encrypted_data_detail_count)

Default Value

0

Remarks

This property controls the size of the following arrays:

• encrypted_data_detail_id
• encrypted_data_detail_mime_type
• encrypted_data_detail_scope
• encrypted_data_detail_xml_element

The array indices start at 0 and end at encrypted_data_detail_count - 1.

encrypted_data_detail_id Property

This property is an optional identifier for the encrypted data.

Syntax

def get_encrypted_data_detail_id(encrypted_data_detail_index: int) -> str: ...
def set_encrypted_data_detail_id(encrypted_data_detail_index: int, value: str) -> None: ...

Default Value

""

Remarks

This property is an optional identifier for the encrypted data.

The encrypted_data_detail_index parameter specifies the index of the item in the array. The size of the array is controlled by the encrypted_data_detail_count property.

encrypted_data_detail_mime_type Property

This property specifies the MIME type of the encrypted data.

Syntax

def get_encrypted_data_detail_mime_type(encrypted_data_detail_index: int) -> str: ...
def set_encrypted_data_detail_mime_type(encrypted_data_detail_index: int, value: str) -> None: ...

Default Value

""

Remarks

This property specifies the MIME type of the encrypted data. For example: "image/png". This property is optional.

The encrypted_data_detail_index parameter specifies the index of the item in the array. The size of the array is controlled by the encrypted_data_detail_count property.

encrypted_data_detail_scope Property

This property specifies the scope of the encryption.

Syntax

def get_encrypted_data_detail_scope(encrypted_data_detail_index: int) -> int: ...
def set_encrypted_data_detail_scope(encrypted_data_detail_index: int, value: int) -> None: ...

Default Value

0

Remarks

This property specifies the scope of the encryption. When calling encrypt the entire XML element specified by encrypted_data_detail_xml_element may be encrypted, or only the content may be encrypted. This setting controls the scope of the encryption. Possible values are:

The encrypted_data_detail_index parameter specifies the index of the item in the array. The size of the array is controlled by the encrypted_data_detail_count property.

encrypted_data_detail_xml_element Property

This property specifies the XPath to the element which will be encrypted.

Syntax

def get_encrypted_data_detail_xml_element(encrypted_data_detail_index: int) -> str: ...
def set_encrypted_data_detail_xml_element(encrypted_data_detail_index: int, value: str) -> None: ...

Default Value

"/"

Remarks

This property specifies the XPath to the element which will be encrypted. For instance:

The encrypted_data_detail_index parameter specifies the index of the item in the array. The size of the array is controlled by the encrypted_data_detail_count property.

encrypting_algorithm Property

Then encryption algorithm used when encrypting.

Syntax

def get_encrypting_algorithm() -> str: ...
def set_encrypting_algorithm(value: str) -> None: ...

encrypting_algorithm = property(get_encrypting_algorithm, set_encrypting_algorithm)

Default Value

"3DES"

Remarks

This property specifies the encryption algorithm to use when encrypting. Possible values are:

• "3DES" (default)
• "DES"
• "AES128"
• "AES192"
• "AES256"

input_file Property

The XML file to process.

Syntax

def get_input_file() -> str: ...
def set_input_file(value: str) -> None: ...

input_file = property(get_input_file, set_input_file)

Default Value

""

Remarks

This property specifies the file to be processed. Set this property to the full or relative path to the file which will be processed.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

input_xml Property

The XML to process.

Syntax

def get_input_xml() -> str: ...
def set_input_xml(value: str) -> None: ...

input_xml = property(get_input_xml, set_input_xml)

Default Value

""

Remarks

This property specifies the XML to be processed.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

output_file Property

The output file.

Syntax

def get_output_file() -> str: ...
def set_output_file(value: str) -> None: ...

output_file = property(get_output_file, set_output_file)

Default Value

""

Remarks

This property specifies the file to which the output will be written. This may be set to an absolute or relative path.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

output_xml Property

The output XML after processing.

Syntax

def get_output_xml() -> str: ...
def set_output_xml(value: str) -> None: ...

output_xml = property(get_output_xml, set_output_xml)

Default Value

""

Remarks

This property will be populated with the output from the operation if output_file is not set.

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

overwrite Property

Indicates whether or not the class should overwrite files.

Syntax

def get_overwrite() -> bool: ...
def set_overwrite(value: bool) -> None: ...

overwrite = property(get_overwrite, set_overwrite)

Default Value

FALSE

Remarks

This property indicates whether or not the class will overwrite output_file. If overwrite is False, an error will be thrown whenever output_file exists before an operation. The default value is False.

recipient_cert_encoded Property

This is the certificate (PEM/Base64 encoded).

Syntax

def get_recipient_cert_encoded() -> bytes: ...
def set_recipient_cert_encoded(value: bytes) -> None: ...

recipient_cert_encoded = property(get_recipient_cert_encoded, set_recipient_cert_encoded)

Default Value

""

Remarks

This is the certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The recipient_cert_store and recipient_cert_subject properties also may be used to specify a certificate.

When recipient_cert_encoded is set, a search is initiated in the current recipient_cert_store for the private key of the certificate. If the key is found, recipient_cert_subject is updated to reflect the full subject of the selected certificate; otherwise, recipient_cert_subject is set to an empty string.

recipient_cert_store Property

This is the name of the certificate store for the client certificate.

Syntax

def get_recipient_cert_store() -> bytes: ...
def set_recipient_cert_store(value: bytes) -> None: ...

recipient_cert_store = property(get_recipient_cert_store, set_recipient_cert_store)

Default Value

"MY"

Remarks

This is the name of the certificate store for the client certificate.

The recipient_cert_store_type property denotes the type of the certificate store specified by recipient_cert_store. If the store is password protected, specify the password in recipient_cert_store_password.

recipient_cert_store is used in conjunction with the recipient_cert_subject property to specify client certificates. If recipient_cert_store has a value, and recipient_cert_subject or recipient_cert_encoded is set, a search for a certificate is initiated. Please see the recipient_cert_subject property for details.

Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

recipient_cert_store_password Property

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Syntax

def get_recipient_cert_store_password() -> str: ...
def set_recipient_cert_store_password(value: str) -> None: ...

recipient_cert_store_password = property(get_recipient_cert_store_password, set_recipient_cert_store_password)

Default Value

""

Remarks

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

recipient_cert_store_type Property

This is the type of certificate store for this certificate.

Syntax

def get_recipient_cert_store_type() -> int: ...
def set_recipient_cert_store_type(value: int) -> None: ...

recipient_cert_store_type = property(get_recipient_cert_store_type, set_recipient_cert_store_type)

Default Value

0

Remarks

This is the type of certificate store for this certificate.

The class supports both public and private keys in a variety of formats. When the cstAuto value is used, the class will automatically determine the type. This property can take one of the following values:

recipient_cert_subject Property

This is the subject of the certificate used for client authentication.

Syntax

def get_recipient_cert_subject() -> str: ...
def set_recipient_cert_subject(value: str) -> None: ...

recipient_cert_subject = property(get_recipient_cert_subject, set_recipient_cert_subject)

Default Value

""

Remarks

This is the subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the property is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are as follows:

If a field value contains a comma, it must be quoted.

symmetric_key Property

The symmetric key used to encrypt and decrypt the XML.

Syntax

def get_symmetric_key() -> bytes: ...
def set_symmetric_key(value: bytes) -> None: ...

symmetric_key = property(get_symmetric_key, set_symmetric_key)

Default Value

""

Remarks

This property specifies the symmetric key used to encrypt and decrypt the XML.

Encrypt Notes

When calling encrypt if the RecipientCert* properties are set, then the symmetric_key will be encrypted and included in the XML as an encrypted key. Using asymmetric encryption to encrypt the symmetric_key allows for secure transmission of the key. This is also referred to as using a session key, as no prior knowledge of the symmetric_key is required by the recipient.

If the RecipientCert* properties are set and symmetric_key is left empty, then a symmetric_key value will automatically be generated by the class when encrypt is called.

When calling encrypt if the RecipientCert* properties are are not set, then the symmetric_key value must be known by the recipient before the message can be decrypted.

Decrypt Notes

When calling decrypt if the data contains an encrypted key the class will attempt to use the certificate specified by the Cert* properties to decrypt the encrypted key and this property is ignored.

When calling decrypt if the data does not contain an encrypted key then symmetric_key must be set either before calling decrypt, or within the on_encrypted_data_info event.

Legal Key and Block Sizes (in bits)

use_oaep Property

Whether to use Optimal Asymmetric Encryption Padding (OAEP).

Syntax

def get_use_oaep() -> bool: ...
def set_use_oaep(value: bool) -> None: ...

use_oaep = property(get_use_oaep, set_use_oaep)

Default Value

FALSE

Remarks

This setting specifies whether to use Optimal Asymmetric Encryption Padding (OAEP) when encrypting the symmetric_key with the certificate specified by recipient_cert. It is only applicable when calling encrypt and recipient_cert is specified.

By default this value is False and the class will use PKCS1.

config Method

Sets or retrieves a configuration setting.

Syntax

def config(configuration_string: str) -> str: ...

Remarks

config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

decrypt Method

Decrypts the XML.

Syntax

def decrypt() -> None: ...

Remarks

This method decrypts the specified XML.

To begin first specify a XML document by setting input_file, or input_xml.

The symmetric_key property specifies the key used to decrypt the data. This may be set before calling decrypt or inside the on_encrypted_data_info event. The on_encrypted_data_info event fires once for each encrypted element when decrypt is called.

If the data was encrypted using an session key, set the Cert* properties to the certificate with private key before calling decrypt. The certificate will be used to decrypt the encrypted session key. In this case the symmetric_key property is ignored.

The following properties are applicable when calling this method:

• symmetric_key
• certificate

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

do_events Method

Processes events from the internal message queue.

Syntax

def do_events() -> None: ...

Remarks

When do_events is called, the class processes any available events. If no events are available, it waits for a preset period of time, and then returns.

encrypt Method

Encrypts the XML.

Syntax

def encrypt() -> None: ...

Remarks

This method encrypts the specified XML.

To begin first specify a XML document by setting input_file, or input_xml.

The EncryptedDataDetail* properties specify the XML element to encrypt. By default the entire XML document is encrypted.

The symmetric_key property specifies the key which will be used to encrypt the data.

If the RecipientCert* properties are set, then the symmetric_key will be encrypted and included in the encrypted data. This allows for the recipient to decrypt the key, with their certificate. Encrypting the symmetric key is also referred to as using a session key. The benefit of using certificate to encrypt and decrypt a session key (symmetric_key) is that knowledge of the key value is not needed ahead of time to process the encrypted data. Note that if specified, recipient_cert MUST have a RSA key, not a DSA key.

If the RecipientCert* properties are not set, then the recipient must know the value of symmetric_key before decrypting the XML. The KeyName setting may be set to provide a key identifier to the recipient.

Optionally set encrypting_algorithm, and then call encrypt to encrypt the XML.

The following properties are applicable when calling this method:

• symmetric_key (required)
• encrypting_algorithm
• EncryptedDataDetail*
• RecipientCert*
• KeyName

Input and Output Properties

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• input_file
• input_xml

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• output_file
• output_xml: The output data is written to this property if no other destination is specified.

reset Method

Resets the class.

Syntax

def reset() -> None: ...

Remarks

When called, the component will reset all of its properties to their default values.

on_encrypted_data_info Event

Fired once for each encrypted element when Decrypt is called.

Syntax

class XMLEncryptEncryptedDataInfoEventParams(object):
  @property
  def encrypted_data_id() -> str: ...

  @property
  def scope() -> int: ...

  @property
  def mime_type() -> str: ...

# In class XMLEncrypt:
@property
def on_encrypted_data_info() -> Callable[[XMLEncryptEncryptedDataInfoEventParams], None]: ...
@on_encrypted_data_info.setter
def on_encrypted_data_info(event_hook: Callable[[XMLEncryptEncryptedDataInfoEventParams], None]) -> None: ...

Remarks

This event fires once for each encrypted element in the XML document when decrypt is called. The parameters of this event provide information about the encrypted data. Additionally, the KeyName setting may be queried to identify the encryption key. symmetric_key may be set from within this event.

EncryptedDataId is the Id of the encrypted data (if any).

Scope indicates the scope of the encrypted data. This defines whether the entire XML element was encrypted, or only the content. Possible values are:

MIMEType holds the MIME type of the encrypted data (if any). For example: "image/png".

on_error Event

Fired when information is available about errors during data delivery.

Syntax

class XMLEncryptErrorEventParams(object):
  @property
  def error_code() -> int: ...

  @property
  def description() -> str: ...

# In class XMLEncrypt:
@property
def on_error() -> Callable[[XMLEncryptErrorEventParams], None]: ...
@on_error.setter
def on_error(event_hook: Callable[[XMLEncryptErrorEventParams], None]) -> None: ...

Remarks

The on_error event is fired in case of exceptional conditions during message processing. Normally the class fails with an error.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

on_progress Event

Fired as progress is made.

Syntax

class XMLEncryptProgressEventParams(object):
  @property
  def bytes_processed() -> int: ...

  @property
  def percent_processed() -> int: ...

  @property
  def operation() -> int: ...

  @property
  def is_eof() -> bool: ...
  @is_eof.setter
  def is_eof(value) -> None: ...

# In class XMLEncrypt:
@property
def on_progress() -> Callable[[XMLEncryptProgressEventParams], None]: ...
@on_progress.setter
def on_progress(event_hook: Callable[[XMLEncryptProgressEventParams], None]) -> None: ...

Remarks

This event is fired automatically as data is processed by the class.

The PercentProcessed parameter indicates the current status of the operation.

The BytesProcessed parameter holds the total number of bytes processed so far.

The Operation parameter is only applicable when either ReadFromProgressEvent or WriteToProgressEvent is set to True. This parameter defines whether a Read or Write operation is required. If the configuration settings are not set this parameter will always return 0. Possible values are:

The IsEOF parameter is only applicable when either ReadFromProgressEvent or WriteToProgressEvent is set to True. This parameter defines whether the Read or Write operation is complete. When the Operation is Read (1) this parameter must be set to indicate that all data has been supplied to the class. When the Operation is Write (2) this value may be queried to determine when all data has been processed.

on_status Event

Provides information about the current operation.

Syntax

class XMLEncryptStatusEventParams(object):
  @property
  def message() -> str: ...

# In class XMLEncrypt:
@property
def on_status() -> Callable[[XMLEncryptStatusEventParams], None]: ...
@on_status.setter
def on_status(event_hook: Callable[[XMLEncryptStatusEventParams], None]) -> None: ...

Remarks

The event is fired for informational and logging purposes only. It may be used to track the progress of an operation.

The level of detail is controlled by the LogLevel setting.

XMLEncrypt Config Settings

The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

XMLEnc Config Settings

Base Config Settings

XMLEncrypt Errors

XMLEnc Errors

	607   Failed to write output.
	609   Could not find encrypted data.
	610   Invalid encrypted data.
	611   Failed parsing certificate data.
	612   SymmetricKey or RecipientCert must be set.

XML Errors

	101   Invalid attribute index.
	102   No attributes available.
	103   Invalid namespace index.
	104   No namespaces available.
	105   Invalid element index.
	106   No elements available.
	107   Attribute does not exist.
	201   Unbalanced element tag.
	202   Unknown element prefix (can't find namespace).
	203   Unknown attribute prefix (can't find namespace).
	204   Invalid XML markup.
	205   Invalid end state for parser.
	206   Document contains unbalanced elements.
	207   Invalid xpath.
	208   No such child.
	209   Top element does not match start of path.
	210   DOM tree unavailable (set build_dom to true and reparse).
	302   Can't open file.
	401   Invalid XML would be generated.
	402   An invalid XML name has been specified.