HEaaN::EnDecoder Class Reference

Class containing functions dealing with message/plaintext encoding and decoding. More...

#include <EnDecoder.hpp>

Public Member Functions
	EnDecoder (const Context &context)
Plaintext	encode (const Message &msg, u64 level, int r_counter=0) const
	Encode a message into a plaintext at a certain level at a certain rescale counter. More...
Plaintext	encode (const Message &msg) const
	Encode a message into a plaintext with the maximal supported level of the current context. More...
Plaintext	encodeWithoutNTT (const Message &msg, u64 level, int r_counter=0) const
	Encode a message into a plaintext at a certain level at a certain rescale counter, without performing NTT. More...
Plaintext	encodeWithoutNTT (const Message &msg) const
	Encode a message into a plaintext with the maximal supported level of the current context, without performing NTT. More...
Message	decode (const Plaintext &ptxt) const
	Decode a plaintext into a message. More...

Private Attributes
const Context	context_
	A context with which the scheme is associated. More...

Detailed Description

Class containing functions dealing with message/plaintext encoding and decoding.

Constructor & Destructor Documentation

EnDecoder()

HEaaN::EnDecoder::EnDecoder ( const Context &  context )

explicit

Member Function Documentation

decode()

Message HEaaN::EnDecoder::decode

(

const Plaintext &

ptxt

)

const

Decode a plaintext into a message.

Parameters

[in]

ptxt

Input plaintext.

Returns

Decoded message.

encode() [1/2]

Plaintext HEaaN::EnDecoder::encode

(

const Message &

msg

)

const

Encode a message into a plaintext with the maximal supported level of the current context.

Parameters

[in]

msg

Input message

Returns

Encoded plaintext.

Encode to the default encryption level.

Exceptions

RuntimeException

if neither the size of the input message is a power of two, nor it exceeds one half of the ciphertext dimension of the current homomorphic encryption context.

encode() [2/2]

Plaintext HEaaN::EnDecoder::encode	(	const Message &	msg,
		u64	level,
		int	r_counter = 0
	)		const

Encode a message into a plaintext at a certain level at a certain rescale counter.

Parameters

[in]	msg	Input message
[in]	level	Target level to which msg is to be encoded
[in]	r_counter	Target rescale counter to which msg is to be encoded

Returns

Encoded plaintext.

All the real and imaginary parts of the slot values in msg should not exceed 2^(64). The output plaintext is in NTT form, which can be directly used in polynomial multiplication. The size of msg should be a power of two, being less than or equal to half of the dimension of the current context.

Exceptions

RuntimeException	if neither the size of the input message is a power of two, nor it exceeds one half of the ciphertext dimension of the current homomorphic encryption context.
RuntimeException	if the target level exceeds the maximal level decided in the homomorphic encryption context.
RuntimeException	if the target rescale counter exceeds the target level.

encodeWithoutNTT() [1/2]

Plaintext HEaaN::EnDecoder::encodeWithoutNTT

(

const Message &

msg

)

const

Encode a message into a plaintext with the maximal supported level of the current context, without performing NTT.

Parameters

[in]

msg

Input message.

Returns

Encoded plaintext.

Exceptions

RuntimeException

if neither the size of the input message is a power of two, nor it exceeds one half of the ciphertext dimension of the current homomorphic encryption context.

encodeWithoutNTT() [2/2]

Plaintext HEaaN::EnDecoder::encodeWithoutNTT	(	const Message &	msg,
		u64	level,
		int	r_counter = 0
	)		const

Encode a message into a plaintext at a certain level at a certain rescale counter, without performing NTT.

Parameters

[in]	msg	Input message.
[in]	level	Target level to which the input msg is to be encoded.
[in]	r_counter	Target rescale counter to which msg is to be encoded

Returns

Encoded plaintext.

Exceptions

RuntimeException	if neither the size of the input message is a power of two, nor it exceeds one half of the ciphertext dimension of the current homomorphic encryption context.
RuntimeException	if the target level exceeds the maximal level decided in the homomorphic encryption context.
RuntimeException	if the target rescale counter exceeds the target level

Member Data Documentation

context_

const Context HEaaN::EnDecoder::context_

private

A context with which the scheme is associated.

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The documentation for this class was generated from the following file:

• include/HEaaN/EnDecoder.hpp