Poly1305 Class

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The Poly1305 class may be used to produce a MAC (or Tag) value using the Poly1305 algorithm.

Syntax

class ipworksencrypt.Poly1305

Remarks

The Poly1305 class implements the Poly1305 algorithm defined in RFC 7539. This may be used to compute a MAC (or Tag) value on data of any length.

The key must be set to a 256 bit (32 byte) key before computing the MAC. The computed MAC is 128 bit (32 bytes) in size.

ComputeMAC Notes

compute_mac computes the MAC (Message Authentication Code) from the input data.

Before calling this method set key to a 256 bit (32 byte) key. If encode_mac is set to True (default) the output data will be hex encoded.

Input Notes

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

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

• input_file
• input_message

When a valid source is found the search stops.

After calling this method mac_value will be populated with the computed 128 bit (16 byte) value.

ComputeMAC Example

Poly1305 poly1305 = new Poly1305(); poly1305.KeyB = new byte[] { 0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a, 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0, 0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09, 0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0 }; poly1305.InputMessage = "Hello Polly"; poly1305.EncodeMAC = true; //hex output poly1305.ComputeMAC(); //This outputs "113019A3ACF5ED2FBB7A45AC1FD67DA1" Console.WriteLine(poly1305.MACValue);

ComputeMACBlock Notes

compute_mac_block allows input to the class to be specified in blocks. This method will return the MAC value only when the parameter LastBlock is True.

InputBuffer specifies the input data.

LastBlock specifies whether the block is the last block. If this is False the method will return an empty byte array.

To calculate the MAC value of data that is broken apart into multiple blocks make multiple calls to this method. For instance: //Encode output in hex poly1305.EncodeMAC = true; //hex output //Pass any number of parts, of any size poly1305.ComputeMACBlock(part1,false); poly1305.ComputeMACBlock(part2,false); poly1305.ComputeMACBlock(part3,false); //Pass true for the last block poly1305.ComputeMACBlock(lastPart,true); //The MACValue property holds the MAC value Console.WriteLine(poly1305.MACValue);

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.

encode_mac Property

Whether the MAC value is hex encoded.

Syntax

def get_encode_mac() -> bool: ...
def set_encode_mac(value: bool) -> None: ...

encode_mac = property(get_encode_mac, set_encode_mac)

Default Value

TRUE

Remarks

This property specifies whether the computed MAC value is hex encoded. When set to True (default) the class will hex encoded the computed MAC for easier use. Set this value to False to obtain the MAC value in an unmodified form.

The default value is True.

input_file Property

The 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_message

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

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

input_message Property

The message to process.

Syntax

def get_input_message() -> bytes: ...
def set_input_message(value: bytes) -> None: ...

input_message = property(get_input_message, set_input_message)

Default Value

""

Remarks

This property specifies the message 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_message

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

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

key Property

The 256 bit (32 byte) key to be used when computing a MAC (Message Authentication Code).

Syntax

def get_key() -> bytes: ...
def set_key(value: bytes) -> None: ...

key = property(get_key, set_key)

Default Value

""

Remarks

This property holds the secret key used when computing the mac_value. The key must be 256 bits (32 bytes) long.

mac_value Property

The computed MAC value.

Syntax

def get_mac_value() -> bytes: ...

mac_value = property(get_mac_value, None)

Default Value

""

Remarks

The 128 bit (16 byte) MAC value calculated after calling compute_mac.

This property is read-only.

compute_mac Method

Computes the MAC.

Syntax

def compute_mac() -> None: ...

Remarks

compute_mac computes the MAC (Message Authentication Code) from the input data.

Before calling this method set key to a 256 bit (32 byte) key. If encode_mac is set to True (default) the output data will be hex encoded.

Input Notes

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

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

• input_file
• input_message

When a valid source is found the search stops.

After calling this method mac_value will be populated with the computed 128 bit (16 byte) value.

ComputeMAC Example

Poly1305 poly1305 = new Poly1305(); poly1305.KeyB = new byte[] { 0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a, 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0, 0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09, 0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0 }; poly1305.InputMessage = "Hello Polly"; poly1305.EncodeMAC = true; //hex output poly1305.ComputeMAC(); //This outputs "113019A3ACF5ED2FBB7A45AC1FD67DA1" Console.WriteLine(poly1305.MACValue);

compute_mac_block Method

Computes the MAC value of specified data.

Syntax

def compute_mac_block(input_buffer: bytes, last_block: bool) -> bytes: ...

Remarks

compute_mac_block allows input to the class to be specified in blocks. This method will return the MAC value only when the parameter LastBlock is True.

InputBuffer specifies the input data.

LastBlock specifies whether the block is the last block. If this is False the method will return an empty byte array.

To calculate the MAC value of data that is broken apart into multiple blocks make multiple calls to this method. For instance: //Encode output in hex poly1305.EncodeMAC = true; //hex output //Pass any number of parts, of any size poly1305.ComputeMACBlock(part1,false); poly1305.ComputeMACBlock(part2,false); poly1305.ComputeMACBlock(part3,false); //Pass true for the last block poly1305.ComputeMACBlock(lastPart,true); //The MACValue property holds the MAC value Console.WriteLine(poly1305.MACValue);

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.

reset Method

Resets the class.

Syntax

def reset() -> None: ...

Remarks

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

on_error Event

Fired when information is available about errors during data delivery.

Syntax

class Poly1305ErrorEventParams(object):
  @property
  def error_code() -> int: ...

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

# In class Poly1305:
@property
def on_error() -> Callable[[Poly1305ErrorEventParams], None]: ...
@on_error.setter
def on_error(event_hook: Callable[[Poly1305ErrorEventParams], 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 Poly1305ProgressEventParams(object):
  @property
  def bytes_processed() -> int: ...

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

# In class Poly1305:
@property
def on_progress() -> Callable[[Poly1305ProgressEventParams], None]: ...
@on_progress.setter
def on_progress(event_hook: Callable[[Poly1305ProgressEventParams], 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.

Poly1305 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.

Base Config Settings

Poly1305 Errors

Poly1305 Errors