Crypto++ 8.7
Free C++ class library of cryptographic schemes
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IETF XChaCha20Poly1305 cipher base implementation. More...
#include <chachapoly.h>
Public Member Functions | |
std::string | AlgorithmName () const |
Provides the name of this algorithm. More... | |
std::string | AlgorithmProvider () const |
Retrieve the provider of this algorithm. More... | |
size_t | MinKeyLength () const |
Returns smallest valid key length. More... | |
size_t | MaxKeyLength () const |
Returns largest valid key length. More... | |
size_t | DefaultKeyLength () const |
Returns default key length. More... | |
size_t | GetValidKeyLength (size_t n) const |
Returns a valid key length for the algorithm. More... | |
bool | IsValidKeyLength (size_t n) const |
Returns whether keylength is a valid key length. More... | |
unsigned int | OptimalDataAlignment () const |
Provides input and output data alignment for optimal performance. More... | |
IV_Requirement | IVRequirement () const |
Minimal requirement for secure IVs. More... | |
unsigned int | IVSize () const |
Returns length of the IV accepted by this object. More... | |
unsigned int | MinIVLength () const |
Provides the minimum size of an IV. More... | |
unsigned int | MaxIVLength () const |
Provides the maximum size of an IV. More... | |
unsigned int | DigestSize () const |
Provides the digest size of the hash. More... | |
lword | MaxHeaderLength () const |
Provides the maximum length of AAD that can be input. More... | |
lword | MaxMessageLength () const |
Provides the maximum length of encrypted data. More... | |
lword | MaxFooterLength () const |
Provides the maximum length of AAD. More... | |
virtual void | EncryptAndAuthenticate (byte *ciphertext, byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *aad, size_t aadLength, const byte *message, size_t messageLength) |
Encrypts and calculates a MAC in one call. More... | |
virtual bool | DecryptAndVerify (byte *message, const byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *aad, size_t aadLength, const byte *ciphertext, size_t ciphertextLength) |
Decrypts and verifies a MAC in one call. More... | |
Public Member Functions inherited from AuthenticatedSymmetricCipherBase | |
bool | IsRandomAccess () const |
Determines whether the cipher supports random access. More... | |
bool | IsSelfInverting () const |
Determines whether the cipher is self-inverting. More... | |
void | SetKey (const byte *userKey, size_t keylength, const NameValuePairs ¶ms) |
Sets or reset the key of this object. More... | |
void | Restart () |
Restart the hash. More... | |
void | Resynchronize (const byte *iv, int length=-1) |
Resynchronize with an IV. More... | |
void | Update (const byte *input, size_t length) |
Updates a hash with additional input. More... | |
void | ProcessData (byte *outString, const byte *inString, size_t length) |
Encrypt or decrypt an array of bytes. More... | |
void | TruncatedFinal (byte *mac, size_t macSize) |
Computes the hash of the current message. More... | |
Public Member Functions inherited from AuthenticatedSymmetricCipher | |
virtual lword | MaxHeaderLength () const =0 |
Provides the maximum length of AAD that can be input. More... | |
virtual lword | MaxMessageLength () const =0 |
Provides the maximum length of encrypted data. More... | |
virtual lword | MaxFooterLength () const |
Provides the maximum length of AAD. More... | |
virtual bool | NeedsPrespecifiedDataLengths () const |
Determines if data lengths must be specified prior to inputting data. More... | |
void | SpecifyDataLengths (lword headerLength, lword messageLength, lword footerLength=0) |
Prescribes the data lengths. More... | |
virtual void | EncryptAndAuthenticate (byte *ciphertext, byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *message, size_t messageLength) |
Encrypts and calculates a MAC in one call. More... | |
virtual bool | DecryptAndVerify (byte *message, const byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *ciphertext, size_t ciphertextLength) |
Decrypts and verifies a MAC in one call. More... | |
virtual std::string | AlgorithmName () const |
Provides the name of this algorithm. More... | |
virtual std::string | AlgorithmProvider () const |
Retrieve the provider of this algorithm. More... | |
Public Member Functions inherited from SimpleKeyingInterface | |
virtual size_t | MinKeyLength () const =0 |
Returns smallest valid key length. More... | |
virtual size_t | MaxKeyLength () const =0 |
Returns largest valid key length. More... | |
virtual size_t | DefaultKeyLength () const =0 |
Returns default key length. More... | |
virtual size_t | GetValidKeyLength (size_t keylength) const =0 |
Returns a valid key length for the algorithm. More... | |
virtual bool | IsValidKeyLength (size_t keylength) const |
Returns whether keylength is a valid key length. More... | |
virtual void | SetKey (const byte *key, size_t length, const NameValuePairs ¶ms=g_nullNameValuePairs) |
Sets or reset the key of this object. More... | |
void | SetKeyWithRounds (const byte *key, size_t length, int rounds) |
Sets or reset the key of this object. More... | |
void | SetKeyWithIV (const byte *key, size_t length, const byte *iv, size_t ivLength) |
Sets or reset the key of this object. More... | |
void | SetKeyWithIV (const byte *key, size_t length, const byte *iv) |
Sets or reset the key of this object. More... | |
virtual IV_Requirement | IVRequirement () const =0 |
Minimal requirement for secure IVs. More... | |
bool | IsResynchronizable () const |
Determines if the object can be resynchronized. More... | |
bool | CanUseRandomIVs () const |
Determines if the object can use random IVs. More... | |
bool | CanUsePredictableIVs () const |
Determines if the object can use random but possibly predictable IVs. More... | |
bool | CanUseStructuredIVs () const |
Determines if the object can use structured IVs. More... | |
virtual unsigned int | IVSize () const |
Returns length of the IV accepted by this object. More... | |
unsigned int | DefaultIVLength () const |
Provides the default size of an IV. More... | |
virtual unsigned int | MinIVLength () const |
Provides the minimum size of an IV. More... | |
virtual unsigned int | MaxIVLength () const |
Provides the maximum size of an IV. More... | |
virtual void | Resynchronize (const byte *iv, int ivLength=-1) |
Resynchronize with an IV. More... | |
virtual void | GetNextIV (RandomNumberGenerator &rng, byte *iv) |
Retrieves a secure IV for the next message. More... | |
Public Member Functions inherited from HashTransformation | |
HashTransformation & | Ref () |
Provides a reference to this object. More... | |
virtual void | Update (const byte *input, size_t length)=0 |
Updates a hash with additional input. More... | |
virtual byte * | CreateUpdateSpace (size_t &size) |
Request space which can be written into by the caller. More... | |
virtual void | Final (byte *digest) |
Computes the hash of the current message. More... | |
virtual void | Restart () |
Restart the hash. More... | |
virtual unsigned int | DigestSize () const =0 |
Provides the digest size of the hash. More... | |
unsigned int | TagSize () const |
Provides the tag size of the hash. More... | |
virtual unsigned int | BlockSize () const |
Provides the block size of the compression function. More... | |
virtual unsigned int | OptimalBlockSize () const |
Provides the input block size most efficient for this hash. More... | |
virtual unsigned int | OptimalDataAlignment () const |
Provides input and output data alignment for optimal performance. More... | |
virtual void | CalculateDigest (byte *digest, const byte *input, size_t length) |
Updates the hash with additional input and computes the hash of the current message. More... | |
virtual bool | Verify (const byte *digest) |
Verifies the hash of the current message. More... | |
virtual bool | VerifyDigest (const byte *digest, const byte *input, size_t length) |
Updates the hash with additional input and verifies the hash of the current message. More... | |
virtual void | TruncatedFinal (byte *digest, size_t digestSize)=0 |
Computes the hash of the current message. More... | |
virtual void | CalculateTruncatedDigest (byte *digest, size_t digestSize, const byte *input, size_t length) |
Updates the hash with additional input and computes the hash of the current message. More... | |
virtual bool | TruncatedVerify (const byte *digest, size_t digestLength) |
Verifies the hash of the current message. More... | |
virtual bool | VerifyTruncatedDigest (const byte *digest, size_t digestLength, const byte *input, size_t length) |
Updates the hash with additional input and verifies the hash of the current message. More... | |
Public Member Functions inherited from Algorithm | |
Algorithm (bool checkSelfTestStatus=true) | |
Interface for all crypto algorithms. More... | |
virtual std::string | AlgorithmName () const |
Provides the name of this algorithm. More... | |
virtual std::string | AlgorithmProvider () const |
Retrieve the provider of this algorithm. More... | |
Public Member Functions inherited from Clonable | |
virtual Clonable * | Clone () const |
Copies this object. More... | |
Public Member Functions inherited from StreamTransformation | |
StreamTransformation & | Ref () |
Provides a reference to this object. More... | |
virtual unsigned int | MandatoryBlockSize () const |
Provides the mandatory block size of the cipher. More... | |
virtual unsigned int | OptimalBlockSize () const |
Provides the input block size most efficient for this cipher. More... | |
virtual unsigned int | GetOptimalBlockSizeUsed () const |
Provides the number of bytes used in the current block when processing at optimal block size. More... | |
virtual unsigned int | OptimalDataAlignment () const |
Provides input and output data alignment for optimal performance. More... | |
virtual void | ProcessData (byte *outString, const byte *inString, size_t length)=0 |
Encrypt or decrypt an array of bytes. More... | |
virtual size_t | ProcessLastBlock (byte *outString, size_t outLength, const byte *inString, size_t inLength) |
Encrypt or decrypt the last block of data. More... | |
virtual unsigned int | MinLastBlockSize () const |
Provides the size of the last block. More... | |
virtual bool | IsLastBlockSpecial () const |
Determines if the last block receives special processing. More... | |
void | ProcessString (byte *inoutString, size_t length) |
Encrypt or decrypt a string of bytes. More... | |
void | ProcessString (byte *outString, const byte *inString, size_t length) |
Encrypt or decrypt a string of bytes. More... | |
byte | ProcessByte (byte input) |
Encrypt or decrypt a byte. More... | |
virtual bool | IsRandomAccess () const =0 |
Determines whether the cipher supports random access. More... | |
virtual void | Seek (lword pos) |
Seek to an absolute position. More... | |
virtual bool | IsSelfInverting () const =0 |
Determines whether the cipher is self-inverting. More... | |
virtual bool | IsForwardTransformation () const =0 |
Determines if the cipher is being operated in its forward direction. More... | |
Static Public Member Functions | |
static const char * | StaticAlgorithmName () |
Additional Inherited Members | |
Public Types inherited from SimpleKeyingInterface | |
enum | IV_Requirement { UNIQUE_IV = 0 , RANDOM_IV , UNPREDICTABLE_RANDOM_IV , INTERNALLY_GENERATED_IV , NOT_RESYNCHRONIZABLE } |
Secure IVs requirements as enumerated values. More... | |
IETF XChaCha20Poly1305 cipher base implementation.
Base implementation of the AuthenticatedSymmetricCipher interface
Definition at line 177 of file chachapoly.h.
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Definition at line 183 of file chachapoly.h.
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inlinestatic |
Definition at line 180 of file chachapoly.h.
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Provides the name of this algorithm.
The standard algorithm name can be a name like AES or AES/GCM. Some algorithms do not have standard names yet. For example, there is no standard algorithm name for Shoup's ECIES.
Reimplemented from AuthenticatedSymmetricCipher.
Definition at line 186 of file chachapoly.h.
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Retrieve the provider of this algorithm.
The algorithm provider can be a name like "C++", "SSE", "NEON", "AESNI", "ARMv8" and "Power8". C++ is standard C++ code. Other labels, like SSE, usually indicate a specialized implementation using instructions from a higher instruction set architecture (ISA). Future labels may include external hardware like a hardware security module (HSM).
Generally speaking Wei Dai's original IA-32 ASM code falls under "SSE2". Labels like "SSSE3" and "SSE4.1" follow after Wei's code and use intrinsics instead of ASM.
Algorithms which combine different instructions or ISAs provide the dominant one. For example on x86 AES/GCM
returns "AESNI" rather than "CLMUL" or "AES+SSE4.1" or "AES+CLMUL" or "AES+SSE4.1+CLMUL".
Reimplemented from AuthenticatedSymmetricCipher.
Definition at line 188 of file chachapoly.h.
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Returns smallest valid key length.
Implements SimpleKeyingInterface.
Definition at line 190 of file chachapoly.h.
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Returns largest valid key length.
Implements SimpleKeyingInterface.
Definition at line 192 of file chachapoly.h.
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Returns default key length.
Implements SimpleKeyingInterface.
Definition at line 194 of file chachapoly.h.
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Returns a valid key length for the algorithm.
keylength | the size of the key, in bytes |
keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH, then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE, then keylength is returned. Otherwise, the function returns a lower multiple of KEYLENGTH_MULTIPLE.
Implements SimpleKeyingInterface.
Definition at line 196 of file chachapoly.h.
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inlinevirtual |
Returns whether keylength is a valid key length.
keylength | the requested keylength |
Internally the function calls GetValidKeyLength()
Reimplemented from SimpleKeyingInterface.
Definition at line 198 of file chachapoly.h.
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Provides input and output data alignment for optimal performance.
Reimplemented from StreamTransformation.
Definition at line 200 of file chachapoly.h.
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inlinevirtual |
Minimal requirement for secure IVs.
Implements SimpleKeyingInterface.
Definition at line 202 of file chachapoly.h.
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inlinevirtual |
Returns length of the IV accepted by this object.
NotImplemented() | if the object does not support resynchronization |
The default implementation throws NotImplemented
Reimplemented from SimpleKeyingInterface.
Definition at line 204 of file chachapoly.h.
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inlinevirtual |
Provides the minimum size of an IV.
NotImplemented() | if the object does not support resynchronization |
Reimplemented from SimpleKeyingInterface.
Definition at line 206 of file chachapoly.h.
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inlinevirtual |
Provides the maximum size of an IV.
NotImplemented() | if the object does not support resynchronization |
Reimplemented from SimpleKeyingInterface.
Definition at line 208 of file chachapoly.h.
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Provides the digest size of the hash.
Implements HashTransformation.
Definition at line 210 of file chachapoly.h.
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Provides the maximum length of AAD that can be input.
Implements AuthenticatedSymmetricCipher.
Definition at line 212 of file chachapoly.h.
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inlinevirtual |
Provides the maximum length of encrypted data.
Implements AuthenticatedSymmetricCipher.
Definition at line 214 of file chachapoly.h.
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inlinevirtual |
Provides the maximum length of AAD.
Reimplemented from AuthenticatedSymmetricCipher.
Definition at line 216 of file chachapoly.h.
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virtual |
Encrypts and calculates a MAC in one call.
ciphertext | the encryption buffer |
mac | the mac buffer |
macSize | the size of the MAC buffer, in bytes |
iv | the iv buffer |
ivLength | the size of the IV buffer, in bytes |
aad | the AAD buffer |
aadLength | the size of the AAD buffer, in bytes |
message | the message buffer |
messageLength | the size of the messagetext buffer, in bytes |
EncryptAndAuthenticate() encrypts and generates the MAC in one call. The function truncates the MAC if macSize < TagSize()
.
Reimplemented from AuthenticatedSymmetricCipher.
Definition at line 195 of file chachapoly.cpp.
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virtual |
Decrypts and verifies a MAC in one call.
message | the decryption buffer |
mac | the mac buffer |
macSize | the size of the MAC buffer, in bytes |
iv | the iv buffer |
ivLength | the size of the IV buffer, in bytes |
aad | the AAD buffer |
aadLength | the size of the AAD buffer, in bytes |
ciphertext | the cipher buffer |
ciphertextLength | the size of the ciphertext buffer, in bytes |
DecryptAndVerify() decrypts and verifies the MAC in one call. message
is a decryption buffer and should be at least as large as the ciphertext buffer.
The function returns true iff MAC is valid. DecryptAndVerify() assumes the MAC is truncated if macLength < TagSize()
.
Reimplemented from AuthenticatedSymmetricCipher.
Definition at line 203 of file chachapoly.cpp.