inverseShuffleRows(key)

Functions
template<domain D :shared3p , type T>
D T	inverseShuffleRows (D T[[2]] mat, D uint8[[1]] key)
template<domain D :shared3p >
D fix32	inverseShuffleRows (D fix32[[2]] mat, D uint8[[1]] key)
template<domain D :shared3p >
D fix64	inverseShuffleRows (D fix64[[2]] mat, D uint8[[1]] key)

Detailed Description

Protocols to undo the shuffling of rows in a matrix with given key.

Note

D - shared3p protection domain

Precondition

the key is exactly 32 bytes long

Returns

the inverse of the permutation of the input matrix, defined by the key

Postcondition

the output matrices rows are a permutation of the input

Note

the declassified value of the key does not matter, internally only the shares are used. If two vectors are shuffled using the same key the permutation applied is the same as long as the vectors are of the same length, and the key does not get reshared.

Leakage

None

Function Documentation

inverseShuffleRows() [1/3]

D fix32 inverseShuffleRows	(	D fix32[[2]]	mat,
		D uint8[[1]]	key
	)

inverseShuffleRows() [2/3]

D fix64 inverseShuffleRows	(	D fix64[[2]]	mat,
		D uint8[[1]]	key
	)

inverseShuffleRows() [3/3]

D T inverseShuffleRows	(	D T[[2]]	mat,
		D uint8[[1]]	key
	)

Note

T - any data type

Parameters

mat	- input matrix to shuffle
key	- an uint8 type key that specifies the permutation