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This section explains the main class of LibTMCG which provides some “high-level operations” from Schindelhauer’s toolbox [Sc98]. Even if the more efficient card encoding scheme of Barnett and Smart [BS03] will deployed in your application, at least one instance of the following class must be created to perform any card or stack operations.
This class implements the main core of Schindelhauer’s toolbox, i.e. important functions like masking, opening, and shuffling of cards and stacks, respectively. Some exotic operations are still missing, e.g., the possibility to insert a masked card secretly into a stack or the verifiable subset properties of stacks. All implemented operations are available for the original encoding scheme of Schindelhauer (see Data Types) and, of course, for the more efficient encoding scheme of Barnett and Smart (see BarnettSmartVTMF) as well.
This read-only nonnegative integer represents the security parameter \kappa which was given to the constructor of this class. It defines the number of sequential protocol iterations and hence the soundness error probability (2^{-\kappa}) of the zero-knowledge proofs in the encoding scheme of Schindelhauer. Further it defines the soundness error probability (also 2^{-\kappa}) of the shuffle argument in the encoding scheme of Barnett and Smart, if the efficient protocols of Groth [Gr05, Gr10] and others [HSSV09] are not used.
This read-only nonnegative integer represents the number of players as given to the constructor of this class.
This read-only nonnegative integer contains the number of bits that are necessary to encode the card types in the binary representation. It was given as an argument to the constructor of this class.
const unsigned long int security, const size_t k, const size_t w)This constructor creates an instance, where security is a nonnegative integer that represents the security parameter \kappa. The parameter k is the number of players and w is the number of bits which are necessary to represent all possible card types in a binary representation.
The integer \kappa controls the maximum soundness error probability
(2^{-\kappa}) of the zero-knowledge proofs in the encoding scheme of
Schindelhauer. Specifically, security defines the number of sequential
iterations of the involved protocols and thus has a major impact on the
computational and communication complexity. If the encoding scheme of Barnett
and Smart [BS03] is used, then it only defines the soundness error
probability (also 2^{-\kappa}) of the corresponding shuffle proof.
However, if the efficient shuffle verification protocol of Groth [Gr05]
is used, then the parameter security is dispensable, because the parameter
ell_e given during instantiation of GrothVSSHE (e.g. the LibTMCG
default security parameter TMCG_GROTH_L_E) determines this soundness
error probability (2^{-\ell_e}).
The similar holds for the verifiable rotation protocol [HSSV09], however,
in this case there is no explicit security parameter for the soundness error.
Unfortunately, the parameters k and w have a major impact on the
complexity in the encoding scheme of Schindelhauer, too. Therefore you should
always use reasonable values here. For example, to create a deck with M
different card types simply set w to \lceil\log_2 M\rceil which
is an tight upper-bound for the applied binary representation. Furthermore,
set k to the number of players which are really involved and not to a
possible maximum value.
Note that k and w are limited by the global constants
TMCG_MAX_PLAYERS and TMCG_MAX_TYPEBITS, respectively.
TMCG_Card& c, const TMCG_PublicKeyRing& ring, const size_t type)This method initializes the open card c with the given type using the encoding scheme of Schindelhauer. The type MUST be an integer from the interval [0, 2^{w} - 1], where w is the number given to the constructor of this class. The w MUST be the same number as used at creation of c (see Data Types). The parameter ring is a container with exactly k public keys, where k is the number given to the constructor of this class. The k MUST be the same number as used at the creation of c.
VTMF_Card& c, BarnettSmartVTMF_dlog* vtmf, const size_t type)This method initializes the open card c with the given type
using the encoding scheme of Barnett and Smart. The type MUST be an
integer from the interval [0, 2^{w} - 1], where w is the
number given to the constructor of this class. The parameter vtmf
is a pointer to an already initialized VTMF instance, i.e. the key
generation protocol was successfully finished (see BarnettSmartVTMF
and BarnettSmartVTMF_dlog_GroupQR, respectively).
TMCG_CardSecret& cs, const TMCG_PublicKeyRing& ring, const size_t index)This method initializes the card secret cs with random values which is necessary to perform later a masking operation on a card. The parameter ring is a container with exactly k public keys, where k is the number given to the constructor of this class. It MUST be the same number as used at the creation of cs (see Data Types). The parameter index is from the interval [0, k - 1] and determines the position of the players public key in the container ring.
VTMF_CardSecret& cs, BarnettSmartVTMF_dlog* vtmf)This method initializes the card secret cs with a random value which is necessary to perform later a masking operation on a card. The parameter vtmf is a pointer to an already initialized VTMF instance, i.e. the key generation protocol MUST be successfully finished (see BarnettSmartVTMF).
TMCG_Card& c, TMCG_CardSecret& cs, const TMCG_PublicKeyRing& ring, const size_t index, const size_t type)This method initializes a masked card c with the given type and
a corresponding card secret cs using the encoding scheme of
Schindelhauer.
The type MUST be an integer from the interval [0, 2^{w} - 1],
where w is the number given to the constructor of this class. The
w MUST be the same number as used at creation of c and cs
(see Data Types). The parameter
ring is a container with exactly k public keys, where k
is the number given to the constructor of this class. The k MUST be
the same number as used at the creation of c and cs. The parameter
index is from the interval [0, k - 1] and determines the
position of the players public key in the container ring.
Internally, TMCG_CreatePrivateCard calls
TMCG_CreateOpenCard to initialize c with type,
TMCG_CreateCardSecret to initialize cs with random
values, and
TMCG_MaskCard to mask c with the secret cs.
VTMF_Card& c, VTMF_CardSecret& cs, BarnettSmartVTMF_dlog* vtmf, const size_t type)This method initializes a masked card c with the given type and
a corresponding card secret cs using the encoding scheme of Barnett and
Smart. The type MUST be an integer from the interval
[0, 2^{w} - 1], where w is the number given to the constructor
of this class. The parameter vtmf is a pointer to an already initialized
VTMF instance, i.e. the key generation protocol MUST be successfully finished
(see BarnettSmartVTMF). Specifically, TMCG_CreatePrivateCard directly
executes the masking operation of the verifiable masking protocol.
const TMCG_Card& c, TMCG_Card& cc, const TMCG_CardSecret& cs, const TMCG_PublicKeyRing& ring, const bool TimingAttackProtection =true)This method performs a masking operation on the open or already masked card
c using the encoding scheme of Schindelhauer. Finally it returns the
result in cc.
The parameter cs MUST be an initialized fresh card secret which has NEVER
been involved in a masking operation before. The parameters c, cc,
and cs MUST be created such that their k and w
corresponds to the numbers given to the constructor of this class,
respectively. The parameter ring is a container with exactly
k public keys.
The protection against timing attacks is turned on, if
TimingAttackProtection is set to true.
const VTMF_Card& c, VTMF_Card& cc, const VTMF_CardSecret& cs, BarnettSmartVTMF_dlog* vtmf, const bool TimingAttackProtection =true)This method performs a masking operation on the open or already masked card
c using the encoding scheme of Barnett and Smart. Finally it returns the
result in cc. Specifically, TMCG_MaskCard directly executes
the masking operation of the verifiable re-masking protocol.
The parameter cs MUST be an initialized fresh card secret which has
NEVER been involved in a masking operation before.
The parameter vtmf is a pointer to an already initialized
VTMF instance, i.e. the key generation protocol MUST be successfully finished
(see BarnettSmartVTMF). The protection against timing attacks is turned on, if
TimingAttackProtection is set to true.
const TMCG_Card& c, const TMCG_Card& cc, const TMCG_CardSecret& cs, const TMCG_PublicKeyRing& ring, std::istream& in, std::ostream& out)This method should be called by the prover after TMCG_MaskCard to show
that he performed the masking operation correctly. The parameters c,
cc, and cs are the input, the result, and the used card secret
of TMCG_MaskCard, respectively.
They MUST be created such that their k resp. w
corresponds to the numbers given to the constructor of this class. The
parameter ring is a container with exactly k public keys.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const VTMF_Card& c, const VTMF_Card& cc, const VTMF_CardSecret& cs, BarnettSmartVTMF_dlog* vtmf, std::istream& in, std::ostream& out)This method should be executed by the prover after calling TMCG_MaskCard
to show that he performed the masking operation correctly. Specifically,
TMCG_ProveMaskCard directly calls the prove operation of the
verifiable re-masking protocol.
The parameters c, cc, and cs are the input, the result, and
the used card secret of TMCG_MaskCard, respectively.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const TMCG_Card& c, const TMCG_Card& cc, const TMCG_PublicKeyRing& ring, std::istream& in, std::ostream& out)This method should be executed by the verifier to check whether or not a
masking operation was performed correctly. The parameters c and
cc are the input and the result of TMCG_MaskCard, respectively.
They MUST be created such that their k resp. w corresponds to
the numbers given to the constructor of this class.
The parameter ring is a container with exactly k public keys.
The input/output protocol messages from and to the prover are
transmitted on the streams in and out, respectively.
The method returns true, if everything was sound.
const VTMF_Card& c, const VTMF_Card& cc, BarnettSmartVTMF_dlog* vtmf, std::istream& in, std::ostream& out)This method should be executed by the verifier to check whether or not a
masking operation was performed correctly. Specifically,
TMCG_VerifyMaskCard directly calls the verify operation of the
verifiable re-masking protocol. The parameters c and
cc are the input and the result of TMCG_MaskCard, respectively.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The input/output protocol messages from and to the prover are
transmitted on the streams in and out, respectively.
The method returns true, if everything was sound.
const TMCG_Card& c, const TMCG_SecretKey& key, const size_t index, std::istream& in, std::ostream& out)This method is used to reveal the card type of c to a verifier.
Every player must execute this method as prover.
The card c MUST be created such that its k resp. w
corresponds to the numbers given to the constructor of this class.
The parameter key is the corresponding secret key (see Data Types)
of the prover. The parameter index is from the
interval [0, k - 1] and contains the position of the provers
public key in the container ring (same as in TMCG_CreateCardSecret).
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const VTMF_Card& c, BarnettSmartVTMF_dlog* vtmf, std::istream& in, std::ostream& out)This method is used to reveal the card type of c to a verifier.
Every player must execute this method as prover.
Specifically, TMCG_ProveCardSecret directly calls the prove operation of the
verifiable decryption protocol.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const TMCG_Card& c, TMCG_CardSecret& cs, const TMCG_PublicKey& key, const size_t index, std::istream& in, std::ostream& out)This method is used to verify and accumulate card type information regarding
c that are supplied by a prover. It is the opposite method of
TMCG_ProveCardSecret and must be executed by the player who wants to
know the type. The secrets provided by the single provers are accumulated in
the parameter cs.
Thus c and cs MUST be created such that their k resp. w
corresponds to the numbers given to the constructor of this class.
The parameter key is the corresponding public key (see Data Types)
of the prover. The parameter index is from the interval [0, k - 1]
and contains the position of the provers public key in the container ring
(same as in TMCG_CreateCardSecret).
The input/output protocol messages from and to the prover are
transmitted on the streams in and out, respectively.
const VTMF_Card& c, BarnettSmartVTMF_dlog* vtmf, std::istream& in, std::ostream& out)This method is used to verify and accumulate card type information regarding
c that are supplied by a prover. It is the opposite method of
TMCG_ProveCardSecret and must be executed by the player who wants
to know the type. The secrets provided by the single provers are accumulated
internally, thus this method cannot be interleaved with the opening of other
cards.
Specifically, TMCG_VerifyCardSecret directly calls the verify
and update operation of the verifiable decryption protocol.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const TMCG_Card& c, TMCG_CardSecret& cs, const TMCG_SecretKey& key, const size_t index)This method is used to compute and accumulate card type information regarding
c. Analogously to TMCG_VerifyCardSecret it must be executed by the
player who wants to know the type of c. The information is accumulated in
the parameter cs.
Thus c and cs MUST be created such that their k resp. w
corresponds to the numbers given to the constructor of this class.
The parameter key is the corresponding secret key (see Data Types)
of the player. The parameter index is from the interval [0, k - 1]
and contains the position of the players public key in the container ring
(same as in TMCG_CreateCardSecret).
const VTMF_Card& c, BarnettSmartVTMF_dlog* vtmf)This method is used to compute and accumulate card type information regarding
c. It MUST be called by the player who wants to know the type of c
BEFORE TMCG_VerifyCardSecret and TMCG_TypeOfCard are executed.
The secrets provided by the player are accumulated internally, thus this method
cannot be interleaved with the opening of other cards.
Specifically, TMCG_SelfCardSecret directly calls the initialize operation
of the verifiable decryption protocol.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
const TMCG_CardSecret& cs)This method returns the type of a masked card provided that the type
information were properly accumulated in cs before (by calling
TMCG_SelfCardSecret and TMCG_VerifyCardSecret, respectively).
const VTMF_Card& c, BarnettSmartVTMF_dlog* vtmf)This method returns the type of a masked card c provided that the type
information regarding c were properly accumulated internally before (by calling
TMCG_SelfCardSecret and TMCG_VerifyCardSecret, respectively).
It returns the value TMCG_MaxCardType, if the opening operation
failed or if the card type was not among the set of valid types.
This method MUST be performed by the player who wants to know the type AFTER
TMCG_SelfCardSecret and TMCG_VerifyCardSecret are executed.
Specifically, TMCG_TypeOfCard directly calls the finalize operation
of the verifiable decryption protocol.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
TMCG_StackSecret<TMCG_CardSecret>& ss, const bool cyclic, const TMCG_PublicKeyRing& ring, const size_t index, const size_t size)This method initializes the stack secret ss with a randomly and
uniformly chosen permutation (using the algorithm of Knuth) and fresh card secrets. Later this stack
secret can be used to perform a secret shuffle operation on a stack.
If the parameter cyclic is set to true, then the permutation
is only a cyclic shift which might be of interest for particular
operations, e.g. cutting the deck.
The parameter ring is a container with exactly k public
keys, where k is the number given to the constructor of this
class. The parameter index is from the interval [0, k - 1]
and contains the position of the players public key in the container
ring. The parameter size determines the size of the created
stack secret, i.e. the number of cards in the corresponding stack. The
size is upper-bounded by TMCG_MAX_CARDS.
The method returns the offset of the cyclic shift, if cyclic was set
to true. Otherwise, the value 0 is returned.
TMCG_StackSecret<VTMF_CardSecret>& ss, const bool cyclic, const size_t size, BarnettSmartVTMF_dlog* vtmf)This method initializes the stack secret ss with a randomly and
uniformly chosen permutation (using the algorithm of Knuth) and fresh
card secrets. Later this stack
secret can be used to perform a secret shuffle operation on a stack.
If the parameter cyclic is set to true, then the permutation
is only a cyclic shift which might be of interest for particular
operations, e.g. cutting the deck.
The parameter size determines the size of the created
stack secret, i.e. the number of cards in the corresponding stack. The
size is upper-bounded by TMCG_MAX_CARDS.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The method returns the offset of the cyclic shift, if cyclic was set
to true. Otherwise, the value 0 is returned.
TMCG_StackSecret<TMCG_CardSecret>& ss, const std::vector<size_t>& pi, const TMCG_PublicKeyRing& ring, const size_t index, const size_t size)This method initializes the stack secret ss with a given
permutation pi and fresh card secrets. Later this stack
secret can be used to perform a secret shuffle operation on a stack.
The parameter ring is a container with exactly k public
keys, where k is the number given to the constructor of this
class. The parameter index is from the interval [0, k - 1]
and contains the position of the players public key in the container
ring. The parameter size determines the size of the created
stack secret, i.e. the number of cards in the corresponding stack. The
size is upper-bounded by TMCG_MAX_CARDS.
TMCG_StackSecret<VTMF_CardSecret>& ss, const std::vector<size_t>& pi, const size_t size, BarnettSmartVTMF_dlog* vtmf)This method initializes the stack secret ss with a given
permutation pi and fresh card secrets. Later this stack
secret can be used to perform a secret shuffle operation on a stack.
The parameter size determines the size of the created
stack secret, i.e. the number of cards in the corresponding stack. The
size is upper-bounded by TMCG_MAX_CARDS.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
const TMCG_Stack<TMCG_Card>& s, TMCG_Stack<TMCG_Card>& s2, const TMCG_StackSecret<TMCG_CardSecret>& ss, const TMCG_PublicKeyRing& ring, const bool TimingAttackProtection =true)This method shuffles a given stack s according to the previously
created stack secret ss (see Data Types). The
result of the shuffle is returned in s2.
The parameter ss MUST be a fresh stack secret which has NEVER
been involved in a shuffle operation before. The parameters s
and ss MUST be of the same size. The parameter ring is a
container with exactly k public keys, where k is the
number given to the constructor of this class.
The protection against timing attacks is turned on, if
TimingAttackProtection is set to true.
const TMCG_Stack<VTMF_Card>& s, TMCG_Stack<VTMF_Card>& s2, const TMCG_StackSecret<VTMF_CardSecret>& ss, BarnettSmartVTMF_dlog* vtmf, const bool TimingAttackProtection =true)This method shuffles a given stack s according to the previously
created stack secret ss (see Data Types). The
result of the shuffle is returned in s2.
The parameter ss MUST be a fresh stack secret which has NEVER
been involved in a shuffle operation before. The parameters s
and ss MUST be of the same size.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The protection against timing attacks is turned on, if
TimingAttackProtection is set to true.
const TMCG_Stack<TMCG_Card>& s, const TMCG_Stack<TMCG_Card>& s2, const TMCG_StackSecret<TMCG_CardSecret>& ss, const bool cyclic, const TMCG_PublicKeyRing& ring, const size_t index, std::istream& in, std::ostream& out)This method should be called by the prover after TMCG_MixStack to show
that he performed the shuffle operation correctly. The parameters s,
s2, and ss are the input, the result, and the used stack secret
of TMCG_MixStack, respectively.
Of course, the parameters s, s2, and ss MUST be of the same size.
The parameter cyclic determines whether a cyclic shift or a full permutation
was used to shuffle the stack.
The parameter ring is a container with exactly k public keys, where
k is the number given to the constructor of this class.
The parameter index is from the interval [0, k - 1] and contains the
position of the provers public key in the container ring.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, const TMCG_StackSecret<VTMF_CardSecret>& ss, const bool cyclic, BarnettSmartVTMF_dlog* vtmf, std::istream& in, std::ostream& out)This method should be called by the prover after TMCG_MixStack to show
that he performed the shuffle operation correctly. The parameters s,
s2, and ss are the input, the result, and the used stack secret
of TMCG_MixStack, respectively.
Of course, the parameters s, s2, and ss MUST be of the same size.
The parameter cyclic determines whether a cyclic shift or a full permutation
was used to shuffle the stack.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, const TMCG_StackSecret<VTMF_CardSecret>& ss, BarnettSmartVTMF_dlog* vtmf, GrothVSSHE* vsshe, std::istream& in, std::ostream& out)This is a method like above. The only difference is that the more
efficient interactive shuffle verification protocol of Groth [Gr05]
is used. Thus vsshe is a pointer to a proper initialized instance
of GrothVSSHE. The rest of the arguments are the same.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, const TMCG_StackSecret<VTMF_CardSecret>& ss, BarnettSmartVTMF_dlog* vtmf, GrothVSSHE* vsshe, std::ostream& out)This is a method like above. The difference is that the non-interactive
version of the shuffle verification protocol is used. Thus only an
output stream out is given, for example std::stringstream
can be appropriate here. Again vsshe is a pointer to a proper
initialized instance of GrothVSSHE. The rest of the arguments
are the same.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, const TMCG_StackSecret<VTMF_CardSecret>& ss, BarnettSmartVTMF_dlog* vtmf, HooghSchoenmakersSkoricVillegasVRHE* vrhe, std::istream& in, std::ostream& out)This is a method like above. The only difference is that the more
efficient rotation verification protocol [HSSV09] is used. Thus vrhe
is a pointer to an initialized instance of HooghSchoenmakersSkoricVillegasVRHE.
The rest of the arguments are the same.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, const TMCG_StackSecret<VTMF_CardSecret>& ss, BarnettSmartVTMF_dlog* vtmf, HooghSchoenmakersSkoricVillegasVRHE* vrhe, std::ostream& out)This is a method like above. The difference is that the non-interactive
version of the rotation verification protocol is used. Thus only an
output stream out is given, for example std::stringstream
can be appropriate here. Again vrhe is a pointer to an initialized
instance of HooghSchoenmakersSkoricVillegasVRHE.
The rest of the arguments are the same.
const TMCG_Stack<TMCG_Card>& s, const TMCG_Stack<TMCG_Card>& s2, const bool cyclic, const TMCG_PublicKeyRing& ring, std::istream& in, std::ostream& out)This method should be executed by the verifier to check whether or not a
shuffle operation was performed correctly. The parameters s and
s2 are the input and the result of TMCG_MixStack, respectively.
Of course, the parameters s and s2 should be of the same size.
The parameter cyclic determines whether a cyclic shift or a full permutation
was used to shuffle the stack.
The parameter ring is a container with exactly k public keys, where
k is the number given to the constructor of this class.
The input/output protocol messages from and to the prover are
transmitted on the streams in and out, respectively.
This method returns true, if the shuffle operation was successfully verified.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, const bool cyclic, BarnettSmartVTMF_dlog* vtmf, std::istream& in, std::ostream& out)This method should be executed by the verifier to check whether or not a
shuffle operation was performed correctly. The parameters s and
s2 are the input and the result of TMCG_MixStack, respectively.
Of course, the parameters s and s2 should be of the same size.
The parameter cyclic determines whether a cyclic shift or a full permutation
was used to shuffle the stack.
The parameter vtmf is a pointer to an already initialized VTMF instance,
i.e. the key generation protocol MUST be successfully finished.
The input/output protocol messages from and to the verifier are
transmitted on the streams in and out, respectively.
This method returns true, if the shuffle operation was successfully verified.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, BarnettSmartVTMF_dlog* vtmf, GrothVSSHE* vsshe, std::istream& in, std::ostream& out)This is a method like above. The only difference is that the more
efficient shuffle verification protocol of Groth is used. Thus vsshe
is a pointer to an initialized instance of GrothVSSHE.
The rest of the arguments and the returned values are the same.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, BarnettSmartVTMF_dlog* vtmf, GrothVSSHE* vsshe, std::istream& in)This is a method like above. The difference is that the non-interactive
version of the shuffle verification protocol is used. Thus only an
input stream in is given, for example std::stringstream
can be appropriate here. Again vsshe is a pointer to an initialized
instance of GrothVSSHE. The rest of the arguments and the returned
values are the same.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, BarnettSmartVTMF_dlog* vtmf, HooghSchoenmakersSkoricVillegasVRHE* vrhe, std::istream& in, std::ostream& out)This is a method like above. The only difference is that the more
efficient rotation verification protocol [HSSV09] is used. Thus vrhe
is a pointer to an initialized instance of HooghSchoenmakersSkoricVillegasVRHE.
The rest of the arguments and the returned values are the same.
const TMCG_Stack<VTMF_Card>& s, const TMCG_Stack<VTMF_Card>& s2, BarnettSmartVTMF_dlog* vtmf, HooghSchoenmakersSkoricVillegasVRHE* vrhe, std::istream& in)This is a method like above. The difference is that the non-interactive
version of the rotation verification protocol is used. Thus only an
input stream in is given, for example std::stringstream
can be appropriate here. Again vrhe is a pointer to an initialized
instance of HooghSchoenmakersSkoricVillegasVRHE.
The rest of the arguments and the returned values are the same.
This destructor releases all occupied resources.
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