Crypto++ 8.2 Free C++ class library of cryptographic schemes

xed25519.h
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1 // xed25519.h - written and placed in public domain by Jeffrey Walton
2 // Crypto++ specific implementation wrapped around Andrew
3 // Moon's public domain curve25519-donna and ed25519-donna,
4 // http://github.com/floodyberry/curve25519-donna and
5 // http://github.com/floodyberry/ed25519-donna.
6
7 // Typically the key agreement classes encapsulate their data more
8 // than x25519 does below. They are a little more accessible
9 // due to crypto_box operations.
10
11 /// \file xed25519.h
12 /// \brief Classes for x25519 and ed25519 operations
13 /// \details This implementation integrates Andrew Moon's public domain code
14 /// for curve25519-donna and ed25519-donna.
15 /// \details Moving keys into and out of the library proceeds as follows.
16 /// If an Integer class is accepted or returned, then the data is in big
17 /// endian format. That is, the MSB is at byte position 0, and the LSB
18 /// is at byte position 31. The Integer will work as expected, just like
19 /// an int or a long.
20 /// \details If a byte array is accepted, then the byte array is in little
21 /// endian format. That is, the LSB is at byte position 0, and the MSB is
22 /// at byte position 31. This follows the implementation where byte 0 is
23 /// clamed with 248. That is my_arr[0] &= 248 to mask the lower 3 bits.
24 /// \details PKCS8 and X509 keys encoded using ASN.1 follow little endian
25 /// arrays. The format is specified in <A HREF=
26 /// "http:///tools.ietf.org/html/draft-ietf-curdle-pkix">draft-ietf-curdle-pkix</A>.
27 /// \details If you have a little endian array and you want to wrap it in
28 /// an Integer using big endian then you can perform the following:
29 /// <pre>Integer x(my_arr, SECRET_KEYLENGTH, UNSIGNED, LITTLE_ENDIAN_ORDER);</pre>
30 /// \sa Andrew Moon's x22519 GitHub <A
31 /// HREF="http://github.com/floodyberry/curve25519-donna">curve25519-donna</A>,
32 /// ed22519 GitHub <A
33 /// HREF="http://github.com/floodyberry/ed25519-donna">ed25519-donna</A>, and
34 /// <A HREF="http:///tools.ietf.org/html/draft-ietf-curdle-pkix">draft-ietf-curdle-pkix</A>
35 /// \since Crypto++ 8.0
36
37 #ifndef CRYPTOPP_XED25519_H
38 #define CRYPTOPP_XED25519_H
39
40 #include "cryptlib.h"
41 #include "pubkey.h"
42 #include "oids.h"
43
44 NAMESPACE_BEGIN(CryptoPP)
45
46 class Integer;
47 struct ed25519Signer;
48 struct ed25519Verifier;
49
50 // ******************** x25519 Agreement ************************* //
51
52 /// \brief x25519 with key validation
53 /// \since Crypto++ 8.0
54 class x25519 : public SimpleKeyAgreementDomain, public CryptoParameters, public PKCS8PrivateKey
55 {
56 public:
57 /// \brief Size of the private key
58 /// \details SECRET_KEYLENGTH is the size of the private key, in bytes.
59 CRYPTOPP_CONSTANT(SECRET_KEYLENGTH = 32);
60 /// \brief Size of the public key
61 /// \details PUBLIC_KEYLENGTH is the size of the public key, in bytes.
62 CRYPTOPP_CONSTANT(PUBLIC_KEYLENGTH = 32);
63 /// \brief Size of the shared key
64 /// \details SHARED_KEYLENGTH is the size of the shared key, in bytes.
65 CRYPTOPP_CONSTANT(SHARED_KEYLENGTH = 32);
66
67 virtual ~x25519() {}
68
69 /// \brief Create a x25519 object
70 /// \details This constructor creates an empty x25519 object. It is
71 /// intended for use in loading existing parameters, like CryptoBox
72 /// parameters. If you are perfoming key agreement you should use a
73 /// constructor that generates random parameters on construction.
74 x25519() {}
75
76 /// \brief Create a x25519 object
77 /// \param y public key
78 /// \param x private key
79 /// \details This constructor creates a x25519 object using existing parameters.
80 /// \note The public key is not validated.
81 x25519(const byte y[PUBLIC_KEYLENGTH], const byte x[SECRET_KEYLENGTH]);
82
83 /// \brief Create a x25519 object
84 /// \param x private key
85 /// \details This constructor creates a x25519 object using existing parameters.
86 /// The public key is calculated from the private key.
87 x25519(const byte x[SECRET_KEYLENGTH]);
88
89 /// \brief Create a x25519 object
90 /// \param y public key
91 /// \param x private key
92 /// \details This constructor creates a x25519 object using existing parameters.
93 /// \note The public key is not validated.
94 x25519(const Integer &y, const Integer &x);
95
96 /// \brief Create a x25519 object
97 /// \param x private key
98 /// \details This constructor creates a x25519 object using existing parameters.
99 /// The public key is calculated from the private key.
100 x25519(const Integer &x);
101
102 /// \brief Create a x25519 object
103 /// \param rng RandomNumberGenerator derived class
104 /// \details This constructor creates a new x25519 using the random number generator.
105 x25519(RandomNumberGenerator &rng);
106
107 /// \brief Create a x25519 object
108 /// \param params public and private key
109 /// \details This constructor creates a x25519 object using existing parameters.
110 /// The <tt>params</tt> can be created with <tt>Save</tt>.
111 /// \note The public key is not validated.
112 x25519(BufferedTransformation &params);
113
114 /// \brief Create a x25519 object
115 /// \param oid an object identifier
116 /// \details This constructor creates a new x25519 using the specified OID. The public
117 /// and private points are uninitialized.
118 x25519(const OID &oid);
119
120 /// \brief Clamp a private key
121 /// \param x private key
122 /// \details ClampKeys() clamps a private key and then regenerates the
123 /// public key from the private key.
124 void ClampKey(byte x[SECRET_KEYLENGTH]) const;
125
126 /// \brief Determine if private key is clamped
127 /// \param x private key
128 bool IsClamped(const byte x[SECRET_KEYLENGTH]) const;
129
130 /// \brief Test if a key has small order
131 /// \param y public key
132 bool IsSmallOrder(const byte y[PUBLIC_KEYLENGTH]) const;
133
134 /// \brief Get the Object Identifier
135 /// \return the Object Identifier
136 /// \details The default OID is from RFC 8410 using <tt>id-X25519</tt>.
137 /// The default private key format is RFC 5208.
138 OID GetAlgorithmID() const {
139 return m_oid.Empty() ? ASN1::X25519() : m_oid;
140 }
141
142 /// \brief Set the Object Identifier
143 /// \param oid the new Object Identifier
144 void SetAlgorithmID(const OID& oid) {
145 m_oid = oid;
146 }
147
148 // CryptoParameters
149 bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
150 bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
151 void AssignFrom(const NameValuePairs &source);
152
153 // CryptoParameters
154 CryptoParameters & AccessCryptoParameters() {return *this;}
155
156 /// \brief DER encode ASN.1 object
157 /// \param bt BufferedTransformation object
158 /// \details Save() will write the OID associated with algorithm or scheme.
159 /// In the case of public and private keys, this function writes the
160 /// subjectPubicKeyInfo parts.
161 /// \details The default OID is from RFC 8410 using <tt>id-X25519</tt>.
162 /// The default private key format is RFC 5208, which is the old format.
163 /// The old format provides the best interop, and keys will work
164 /// with OpenSSL.
165 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
166 /// Key Packages</A>
167 void Save(BufferedTransformation &bt) const {
168 DEREncode(bt, 0);
169 }
170
171 /// \brief DER encode ASN.1 object
172 /// \param bt BufferedTransformation object
173 /// \param v1 flag indicating v1
174 /// \details Save() will write the OID associated with algorithm or scheme.
175 /// In the case of public and private keys, this function writes the
176 /// subjectPubicKeyInfo parts.
177 /// \details The default OID is from RFC 8410 using <tt>id-X25519</tt>.
178 /// The default private key format is RFC 5208.
179 /// \details v1 means INTEGER 0 is written. INTEGER 0 means
180 /// RFC 5208 format, which is the old format. The old format provides
181 /// the best interop, and keys will work with OpenSSL. The other
182 /// option uses INTEGER 1. INTEGER 1 means RFC 5958 format,
183 /// which is the new format.
184 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
185 /// Key Packages</A>
186 void Save(BufferedTransformation &bt, bool v1) const {
187 DEREncode(bt, v1 ? 0 : 1);
188 }
189
190 /// \brief BER decode ASN.1 object
191 /// \param bt BufferedTransformation object
192 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
193 /// Key Packages</A>
194 void Load(BufferedTransformation &bt) {
195 BERDecode(bt);
196 }
197
198 // PKCS8PrivateKey
199 void BERDecode(BufferedTransformation &bt);
200 void DEREncode(BufferedTransformation &bt) const { DEREncode(bt, 0); }
201 void BERDecodePrivateKey(BufferedTransformation &bt, bool parametersPresent, size_t size);
202 void DEREncodePrivateKey(BufferedTransformation &bt) const;
203
204 /// \brief DER encode ASN.1 object
205 /// \param bt BufferedTransformation object
206 /// \param version indicates version
207 /// \details DEREncode() will write the OID associated with algorithm or
208 /// scheme. In the case of public and private keys, this function writes
209 /// the subjectPubicKeyInfo parts.
210 /// \details The default OID is from RFC 8410 using <tt>id-X25519</tt>.
211 /// The default private key format is RFC 5208.
212 /// \details The value of version is written as the INTEGER. INTEGER 0 means
213 /// RFC 5208 format, which is the old format. The old format provides
214 /// the best interop, and keys will work with OpenSSL. The INTEGER 1
215 /// means RFC 5958 format, which is the new format.
216 void DEREncode(BufferedTransformation &bt, int version) const;
217
218 /// \brief Determine if OID is valid for this object
219 /// \details BERDecodeAndCheckAlgorithmID() parses the OID from
220 /// <tt>bt</tt> and determines if it valid for this object. The
221 /// problem in practice is there are multiple OIDs available to
222 /// denote curve25519 operations. The OIDs include an old GNU
223 /// OID used by SSH, OIDs specified in draft-josefsson-pkix-newcurves,
224 /// and OIDs specified in draft-ietf-curdle-pkix.
225 /// \details By default BERDecodeAndCheckAlgorithmID() accepts an
226 /// OID set by the user, <tt>ASN1::curve25519()</tt> and <tt>ASN1::X25519()</tt>.
227 /// <tt>ASN1::curve25519()</tt> is generic and says "this key is valid for
228 /// curve25519 operations". <tt>ASN1::X25519()</tt> is specific and says
229 /// "this key is valid for x25519 key exchange."
230 void BERDecodeAndCheckAlgorithmID(BufferedTransformation& bt);
231
232 // DL_PrivateKey
233 void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params);
234
235 // SimpleKeyAgreementDomain
236 unsigned int AgreedValueLength() const {return SHARED_KEYLENGTH;}
237 unsigned int PrivateKeyLength() const {return SECRET_KEYLENGTH;}
238 unsigned int PublicKeyLength() const {return PUBLIC_KEYLENGTH;}
239
240 // SimpleKeyAgreementDomain
241 void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const;
242 void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const;
243 bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const;
244
245 protected:
246 // Create a public key from a private key
247 void SecretToPublicKey(byte y[PUBLIC_KEYLENGTH], const byte x[SECRET_KEYLENGTH]) const;
248
249 protected:
250 FixedSizeSecBlock<byte, SECRET_KEYLENGTH> m_sk;
251 FixedSizeSecBlock<byte, PUBLIC_KEYLENGTH> m_pk;
252 OID m_oid; // preferred OID
253 };
254
255 // ****************** ed25519 Signer *********************** //
256
257 /// \brief ed25519 message accumulator
258 /// \details ed25519 buffers the entire message, and does not
259 /// digest the message incrementally. You should be careful with
260 /// large messages like files on-disk. The behavior is by design
261 /// because Bernstein feels small messages should be authenticated;
262 /// and larger messages will be digested by the application.
263 /// \details The accumulator is used for signing and verification.
264 /// The first 64-bytes of storage is reserved for the signature.
265 /// During signing the signature storage is unused. During
266 /// verification the first 64 bytes holds the signature. The
267 /// signature is provided by the PK_Verifier framework and the
268 /// call to PK_Signer::InputSignature. Member functions data()
269 /// and size() refer to the accumulated message. Member function
270 /// signature() refers to the signature with an implicit size of
271 /// SIGNATURE_LENGTH bytes.
272 /// \details Applications which digest large messages, like an ISO
273 /// disk file, should take care because the design effectively
274 /// disgorges the format operation from the signing operation.
275 /// Put another way, be careful to ensure what you are signing is
276 /// is in fact a digest of the intended message, and not a different
277 /// message digest supplied by an attacker.
278 struct ed25519_MessageAccumulator : public PK_MessageAccumulator
279 {
280 CRYPTOPP_CONSTANT(RESERVE_SIZE=2048+64);
281 CRYPTOPP_CONSTANT(SIGNATURE_LENGTH=64);
282
283 /// \brief Create a message accumulator
284 ed25519_MessageAccumulator() {
285 Restart();
286 }
287
288 /// \brief Create a message accumulator
289 /// \details ed25519 does not use a RNG. You can safely use
290 /// NullRNG() because IsProbablistic returns false.
291 ed25519_MessageAccumulator(RandomNumberGenerator &rng) {
292 CRYPTOPP_UNUSED(rng); Restart();
293 }
294
295 /// \brief Add data to the accumulator
296 /// \param msg pointer to the data to accumulate
297 /// \param len the size of the data, in bytes
298 void Update(const byte* msg, size_t len) {
299 if (msg && len)
300 m_msg.insert(m_msg.end(), msg, msg+len);
301 }
302
303 /// \brief Reset the accumulator
304 void Restart() {
305 m_msg.reserve(RESERVE_SIZE);
306 m_msg.resize(SIGNATURE_LENGTH);
307 }
308
309 /// \brief Retrieve pointer to signature buffer
310 /// \return pointer to signature buffer
311 byte* signature() {
312 return &m_msg[0];
313 }
314
315 /// \brief Retrieve pointer to signature buffer
316 /// \return pointer to signature buffer
317 const byte* signature() const {
318 return &m_msg[0];
319 }
320
321 /// \brief Retrieve pointer to data buffer
322 /// \return pointer to data buffer
323 const byte* data() const {
324 return &m_msg[0]+SIGNATURE_LENGTH;
325 }
326
327 /// \brief Retrieve size of data buffer
328 /// \return size of the data buffer, in bytes
329 size_t size() const {
330 return m_msg.size()-SIGNATURE_LENGTH;
331 }
332
333 protected:
334 // TODO: Find an equivalent Crypto++ structure.
335 std::vector<byte, AllocatorWithCleanup<byte> > m_msg;
336 };
337
338 /// \brief Ed25519 private key
339 /// \details ed25519PrivateKey is somewhat of a hack. It needed to
340 /// provide DL_PrivateKey interface to fit into the existing
341 /// framework, but it lacks a lot of the internals of a true
342 /// DL_PrivateKey. The missing pieces include GroupParameters
343 /// and Point, which provide the low level field operations
344 /// found in traditional implementations like NIST curves over
345 /// prime and binary fields.
346 /// \details ed25519PrivateKey is also unusual because the
347 /// class members of interest are byte arrays and not Integers.
348 /// In addition, the byte arrays are little-endian meaning
349 /// LSB is at element 0 and the MSB is at element 31.
350 /// If you call GetPrivateExponent() then the little-endian byte
351 /// array is converted to a big-endian Integer() so it can be
352 /// returned the way a caller expects. And calling
353 /// SetPrivateExponent perfoms a similar internal conversion.
354 /// \since Crypto++ 8.0
355 struct ed25519PrivateKey : public PKCS8PrivateKey
356 {
357 /// \brief Size of the private key
358 /// \details SECRET_KEYLENGTH is the size of the private key, in bytes.
359 CRYPTOPP_CONSTANT(SECRET_KEYLENGTH = 32);
360 /// \brief Size of the public key
361 /// \details PUBLIC_KEYLENGTH is the size of the public key, in bytes.
362 CRYPTOPP_CONSTANT(PUBLIC_KEYLENGTH = 32);
363 /// \brief Size of the siganture
364 /// \details SIGNATURE_LENGTH is the size of the signature, in bytes.
365 /// ed25519 is a DL-based signature scheme. The signature is the
366 /// concatenation of <tt>r || s</tt>.
367 CRYPTOPP_CONSTANT(SIGNATURE_LENGTH = 64);
368
369 // CryptoMaterial
370 bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
371 bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
372 void AssignFrom(const NameValuePairs &source);
373
374 // GroupParameters
375 OID GetAlgorithmID() const {
376 return m_oid.Empty() ? ASN1::Ed25519() : m_oid;
377 }
378
379 /// \brief DER encode ASN.1 object
380 /// \param bt BufferedTransformation object
381 /// \details Save() will write the OID associated with algorithm or scheme.
382 /// In the case of public and private keys, this function writes the
383 /// subjectPubicKeyInfo parts.
384 /// \details The default OID is from RFC 8410 using <tt>id-Ed25519</tt>.
385 /// The default private key format is RFC 5208, which is the old format.
386 /// The old format provides the best interop, and keys will work
387 /// with OpenSSL.
388 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
389 /// Key Packages</A>
390 void Save(BufferedTransformation &bt) const {
391 DEREncode(bt, 0);
392 }
393
394 /// \brief DER encode ASN.1 object
395 /// \param bt BufferedTransformation object
396 /// \param v1 flag indicating v1
397 /// \details Save() will write the OID associated with algorithm or scheme.
398 /// In the case of public and private keys, this function writes the
399 /// subjectPubicKeyInfo parts.
400 /// \details The default OID is from RFC 8410 using <tt>id-Ed25519</tt>.
401 /// The default private key format is RFC 5208.
402 /// \details v1 means INTEGER 0 is written. INTEGER 0 means
403 /// RFC 5208 format, which is the old format. The old format provides
404 /// the best interop, and keys will work with OpenSSL. The other
405 /// option uses INTEGER 1. INTEGER 1 means RFC 5958 format,
406 /// which is the new format.
407 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
408 /// Key Packages</A>
409 void Save(BufferedTransformation &bt, bool v1) const {
410 DEREncode(bt, v1 ? 0 : 1);
411 }
412
413 /// \brief BER decode ASN.1 object
414 /// \param bt BufferedTransformation object
415 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
416 /// Key Packages</A>
417 void Load(BufferedTransformation &bt) {
418 BERDecode(bt);
419 }
420
421 /// \brief Initializes a public key from this key
422 /// \param pub reference to a public key
423 void MakePublicKey(PublicKey &pub) const;
424
425 // PKCS8PrivateKey
426 void BERDecode(BufferedTransformation &bt);
427 void DEREncode(BufferedTransformation &bt) const { DEREncode(bt, 0); }
428 void BERDecodePrivateKey(BufferedTransformation &bt, bool parametersPresent, size_t size);
429 void DEREncodePrivateKey(BufferedTransformation &bt) const;
430
431 /// \brief DER encode ASN.1 object
432 /// \param bt BufferedTransformation object
433 /// \param version indicates version
434 /// \details DEREncode() will write the OID associated with algorithm or
435 /// scheme. In the case of public and private keys, this function writes
436 /// the subjectPubicKeyInfo parts.
437 /// \details The default OID is from RFC 8410 using <tt>id-X25519</tt>.
438 /// The default private key format is RFC 5208.
439 /// \details The value of version is written as the INTEGER. INTEGER 0 means
440 /// RFC 5208 format, which is the old format. The old format provides
441 /// the best interop, and keys will work with OpenSSL. The INTEGER 1
442 /// means RFC 5958 format, which is the new format.
443 void DEREncode(BufferedTransformation &bt, int version) const;
444
445 /// \brief Determine if OID is valid for this object
446 /// \details BERDecodeAndCheckAlgorithmID() parses the OID from
447 /// <tt>bt</tt> and determines if it valid for this object. The
448 /// problem in practice is there are multiple OIDs available to
449 /// denote curve25519 operations. The OIDs include an old GNU
450 /// OID used by SSH, OIDs specified in draft-josefsson-pkix-newcurves,
451 /// and OIDs specified in draft-ietf-curdle-pkix.
452 /// \details By default BERDecodeAndCheckAlgorithmID() accepts an
453 /// OID set by the user, <tt>ASN1::curve25519()</tt> and <tt>ASN1::Ed25519()</tt>.
454 /// <tt>ASN1::curve25519()</tt> is generic and says "this key is valid for
455 /// curve25519 operations". <tt>ASN1::Ed25519()</tt> is specific and says
456 /// "this key is valid for ed25519 signing."
457 void BERDecodeAndCheckAlgorithmID(BufferedTransformation& bt);
458
459 // PKCS8PrivateKey
460 void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params);
461 void SetPrivateExponent(const byte x[SECRET_KEYLENGTH]);
462 void SetPrivateExponent(const Integer &x);
463 const Integer& GetPrivateExponent() const;
464
465 /// \brief Test if a key has small order
466 /// \param y public key
467 bool IsSmallOrder(const byte y[PUBLIC_KEYLENGTH]) const;
468
469 /// \brief Retrieve private key byte array
470 /// \return the private key byte array
471 /// \details GetPrivateKeyBytePtr() is used by signing code to call ed25519_sign.
472 const byte* GetPrivateKeyBytePtr() const {
473 return m_sk.begin();
474 }
475
476 /// \brief Retrieve public key byte array
477 /// \return the public key byte array
478 /// \details GetPublicKeyBytePtr() is used by signing code to call ed25519_sign.
479 const byte* GetPublicKeyBytePtr() const {
480 return m_pk.begin();
481 }
482
483 protected:
484 // Create a public key from a private key
485 void SecretToPublicKey(byte y[PUBLIC_KEYLENGTH], const byte x[SECRET_KEYLENGTH]) const;
486
487 protected:
488 FixedSizeSecBlock<byte, SECRET_KEYLENGTH> m_sk;
489 FixedSizeSecBlock<byte, PUBLIC_KEYLENGTH> m_pk;
490 OID m_oid; // preferred OID
491 mutable Integer m_x; // for DL_PrivateKey
492 };
493
494 /// \brief Ed25519 signature algorithm
495 /// \since Crypto++ 8.0
496 struct ed25519Signer : public PK_Signer
497 {
498 /// \brief Size of the private key
499 /// \details SECRET_KEYLENGTH is the size of the private key, in bytes.
500 CRYPTOPP_CONSTANT(SECRET_KEYLENGTH = 32);
501 /// \brief Size of the public key
502 /// \details PUBLIC_KEYLENGTH is the size of the public key, in bytes.
503 CRYPTOPP_CONSTANT(PUBLIC_KEYLENGTH = 32);
504 /// \brief Size of the siganture
505 /// \details SIGNATURE_LENGTH is the size of the signature, in bytes.
506 /// ed25519 is a DL-based signature scheme. The signature is the
507 /// concatenation of <tt>r || s</tt>.
508 CRYPTOPP_CONSTANT(SIGNATURE_LENGTH = 64);
509 typedef Integer Element;
510
511 virtual ~ed25519Signer() {}
512
513 /// \brief Create a ed25519Signer object
514 ed25519Signer() {}
515
516 /// \brief Create a ed25519Signer object
517 /// \param y public key
518 /// \param x private key
519 /// \details This constructor creates a ed25519Signer object using existing parameters.
520 /// \note The public key is not validated.
521 ed25519Signer(const byte y[PUBLIC_KEYLENGTH], const byte x[SECRET_KEYLENGTH]);
522
523 /// \brief Create a ed25519Signer object
524 /// \param x private key
525 /// \details This constructor creates a ed25519Signer object using existing parameters.
526 /// The public key is calculated from the private key.
527 ed25519Signer(const byte x[SECRET_KEYLENGTH]);
528
529 /// \brief Create a ed25519Signer object
530 /// \param y public key
531 /// \param x private key
532 /// \details This constructor creates a ed25519Signer object using existing parameters.
533 /// \note The public key is not validated.
534 ed25519Signer(const Integer &y, const Integer &x);
535
536 /// \brief Create a ed25519Signer object
537 /// \param x private key
538 /// \details This constructor creates a ed25519Signer object using existing parameters.
539 /// The public key is calculated from the private key.
540 ed25519Signer(const Integer &x);
541
542 /// \brief Create a ed25519Signer object
543 /// \param rng RandomNumberGenerator derived class
544 /// \details This constructor creates a new ed25519Signer using the random number generator.
545 ed25519Signer(RandomNumberGenerator &rng);
546
547 /// \brief Create a ed25519Signer object
548 /// \param params public and private key
549 /// \details This constructor creates a ed25519Signer object using existing parameters.
550 /// The <tt>params</tt> can be created with <tt>Save</tt>.
551 /// \note The public key is not validated.
552 ed25519Signer(BufferedTransformation &params);
553
554 // DL_ObjectImplBase
555 /// \brief Retrieves a reference to a Private Key
556 /// \details AccessKey() retrieves a non-const reference to a private key.
557 PrivateKey& AccessKey() { return m_key; }
558 PrivateKey& AccessPrivateKey() { return m_key; }
559
560 /// \brief Retrieves a reference to a Private Key
561 /// \details AccessKey() retrieves a const reference to a private key.
562 const PrivateKey& GetKey() const { return m_key; }
563 const PrivateKey& GetPrivateKey() const { return m_key; }
564
565 // DL_SignatureSchemeBase
566 size_t SignatureLength() const { return SIGNATURE_LENGTH; }
567 size_t MaxRecoverableLength() const { return 0; }
568 size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const {
569 CRYPTOPP_UNUSED(signatureLength); return 0;
570 }
571
572 bool IsProbabilistic() const { return false; }
573 bool AllowNonrecoverablePart() const { return false; }
574 bool RecoverablePartFirst() const { return false; }
575
576 PK_MessageAccumulator* NewSignatureAccumulator(RandomNumberGenerator &rng) const {
577 return new ed25519_MessageAccumulator(rng);
578 }
579
580 void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const {
581 CRYPTOPP_UNUSED(messageAccumulator); CRYPTOPP_UNUSED(recoverableMessage);
582 CRYPTOPP_UNUSED(recoverableMessageLength);
583 throw NotImplemented("ed25519Signer: this object does not support recoverable messages");
584 }
585
586 size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart) const;
587
588 /// \brief Sign a stream
589 /// \param rng a RandomNumberGenerator derived class
590 /// \param stream an std::istream derived class
591 /// \param signature a block of bytes for the signature
592 /// \return actual signature length
593 /// \details SignStream() handles large streams. The Stream functions were added to
594 /// ed25519 for signing and verifying files that are too large for a memory allocation.
595 /// The functions are not present in other library signers and verifiers.
596 /// \details ed25519 is a determinsitic signature scheme. <tt>IsProbabilistic()</tt>
597 /// returns false and the random number generator can be <tt>NullRNG()</tt>.
598 /// \pre <tt>COUNTOF(signature) == MaxSignatureLength()</tt>
599 /// \since Crypto++ 8.1
600 size_t SignStream (RandomNumberGenerator &rng, std::istream& stream, byte *signature) const;
601
602 protected:
603 ed25519PrivateKey m_key;
604 };
605
606 // ****************** ed25519 Verifier *********************** //
607
608 /// \brief Ed25519 public key
609 /// \details ed25519PublicKey is somewhat of a hack. It needed to
610 /// provide DL_PublicKey interface to fit into the existing
611 /// framework, but it lacks a lot of the internals of a true
612 /// DL_PublicKey. The missing pieces include GroupParameters
613 /// and Point, which provide the low level field operations
614 /// found in traditional implementations like NIST curves over
615 /// prime and binary fields.
616 /// \details ed25519PublicKey is also unusual because the
617 /// class members of interest are byte arrays and not Integers.
618 /// In addition, the byte arrays are little-endian meaning
619 /// LSB is at element 0 and the MSB is at element 31.
620 /// If you call GetPublicElement() then the little-endian byte
621 /// array is converted to a big-endian Integer() so it can be
622 /// returned the way a caller expects. And calling
623 /// SetPublicElement() perfoms a similar internal conversion.
624 /// \since Crypto++ 8.0
625 struct ed25519PublicKey : public X509PublicKey
626 {
627 /// \brief Size of the public key
628 /// \details PUBLIC_KEYLENGTH is the size of the public key, in bytes.
629 CRYPTOPP_CONSTANT(PUBLIC_KEYLENGTH = 32);
630 typedef Integer Element;
631
632 OID GetAlgorithmID() const {
633 return m_oid.Empty() ? ASN1::Ed25519() : m_oid;
634 }
635
636 /// \brief DER encode ASN.1 object
637 /// \param bt BufferedTransformation object
638 /// \details Save() will write the OID associated with algorithm or scheme.
639 /// In the case of public and private keys, this function writes the
640 /// subjectPubicKeyInfo parts.
641 /// \details The default OID is from RFC 8410 using <tt>id-X25519</tt>.
642 /// The default private key format is RFC 5208, which is the old format.
643 /// The old format provides the best interop, and keys will work
644 /// with OpenSSL.
645 void Save(BufferedTransformation &bt) const {
646 DEREncode(bt);
647 }
648
649 /// \brief BER decode ASN.1 object
650 /// \param bt BufferedTransformation object
651 /// \sa <A HREF="http://tools.ietf.org/rfc/rfc5958.txt">RFC 5958, Asymmetric
652 /// Key Packages</A>
653 void Load(BufferedTransformation &bt) {
654 BERDecode(bt);
655 }
656
657 // X509PublicKey
658 void BERDecode(BufferedTransformation &bt);
659 void DEREncode(BufferedTransformation &bt) const;
660 void BERDecodePublicKey(BufferedTransformation &bt, bool parametersPresent, size_t size);
661 void DEREncodePublicKey(BufferedTransformation &bt) const;
662
663 /// \brief Determine if OID is valid for this object
664 /// \details BERDecodeAndCheckAlgorithmID() parses the OID from
665 /// <tt>bt</tt> and determines if it valid for this object. The
666 /// problem in practice is there are multiple OIDs available to
667 /// denote curve25519 operations. The OIDs include an old GNU
668 /// OID used by SSH, OIDs specified in draft-josefsson-pkix-newcurves,
669 /// and OIDs specified in draft-ietf-curdle-pkix.
670 /// \details By default BERDecodeAndCheckAlgorithmID() accepts an
671 /// OID set by the user, <tt>ASN1::curve25519()</tt> and <tt>ASN1::Ed25519()</tt>.
672 /// <tt>ASN1::curve25519()</tt> is generic and says "this key is valid for
673 /// curve25519 operations". <tt>ASN1::Ed25519()</tt> is specific and says
674 /// "this key is valid for ed25519 signing."
675 void BERDecodeAndCheckAlgorithmID(BufferedTransformation& bt);
676
677 bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
678 bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
679 void AssignFrom(const NameValuePairs &source);
680
681 // DL_PublicKey
682 void SetPublicElement(const byte y[PUBLIC_KEYLENGTH]);
683 void SetPublicElement(const Element &y);
684 const Element& GetPublicElement() const;
685
686 /// \brief Retrieve public key byte array
687 /// \return the public key byte array
688 /// \details GetPublicKeyBytePtr() is used by signing code to call ed25519_sign.
689 const byte* GetPublicKeyBytePtr() const {
690 return m_pk.begin();
691 }
692
693 protected:
694 FixedSizeSecBlock<byte, PUBLIC_KEYLENGTH> m_pk;
695 OID m_oid; // preferred OID
696 mutable Integer m_y; // for DL_PublicKey
697 };
698
699 /// \brief Ed25519 signature verification algorithm
700 /// \since Crypto++ 8.0
701 struct ed25519Verifier : public PK_Verifier
702 {
703 CRYPTOPP_CONSTANT(PUBLIC_KEYLENGTH = 32);
704 CRYPTOPP_CONSTANT(SIGNATURE_LENGTH = 64);
705 typedef Integer Element;
706
707 virtual ~ed25519Verifier() {}
708
709 /// \brief Create a ed25519Verifier object
710 ed25519Verifier() {}
711
712 /// \brief Create a ed25519Verifier object
713 /// \param y public key
714 /// \details This constructor creates a ed25519Verifier object using existing parameters.
715 /// \note The public key is not validated.
716 ed25519Verifier(const byte y[PUBLIC_KEYLENGTH]);
717
718 /// \brief Create a ed25519Verifier object
719 /// \param y public key
720 /// \details This constructor creates a ed25519Verifier object using existing parameters.
721 /// \note The public key is not validated.
722 ed25519Verifier(const Integer &y);
723
724 /// \brief Create a ed25519Verifier object
725 /// \param params public and private key
726 /// \details This constructor creates a ed25519Verifier object using existing parameters.
727 /// The <tt>params</tt> can be created with <tt>Save</tt>.
728 /// \note The public key is not validated.
729 ed25519Verifier(BufferedTransformation &params);
730
731 /// \brief Create a ed25519Verifier object
732 /// \param signer ed25519 signer object
733 /// \details This constructor creates a ed25519Verifier object using existing parameters.
734 /// The <tt>params</tt> can be created with <tt>Save</tt>.
735 /// \note The public key is not validated.
736 ed25519Verifier(const ed25519Signer& signer);
737
738 // DL_ObjectImplBase
739 /// \brief Retrieves a reference to a Public Key
740 /// \details AccessKey() retrieves a non-const reference to a public key.
741 PublicKey& AccessKey() { return m_key; }
742 PublicKey& AccessPublicKey() { return m_key; }
743
744 /// \brief Retrieves a reference to a Public Key
745 /// \details GetKey() retrieves a const reference to a public key.
746 const PublicKey& GetKey() const { return m_key; }
747 const PublicKey& GetPublicKey() const { return m_key; }
748
749 // DL_SignatureSchemeBase
750 size_t SignatureLength() const { return SIGNATURE_LENGTH; }
751 size_t MaxRecoverableLength() const { return 0; }
752 size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const {
753 CRYPTOPP_UNUSED(signatureLength); return 0;
754 }
755
756 bool IsProbabilistic() const { return false; }
757 bool AllowNonrecoverablePart() const { return false; }
758 bool RecoverablePartFirst() const { return false; }
759
760 ed25519_MessageAccumulator* NewVerificationAccumulator() const {
761 return new ed25519_MessageAccumulator;
762 }
763
764 void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const {
765 CRYPTOPP_ASSERT(signature != NULLPTR);
766 CRYPTOPP_ASSERT(signatureLength == SIGNATURE_LENGTH);
767 ed25519_MessageAccumulator& accum = static_cast<ed25519_MessageAccumulator&>(messageAccumulator);
768 if (signature && signatureLength)
769 std::memcpy(accum.signature(), signature, STDMIN((size_t)SIGNATURE_LENGTH, signatureLength));
770 }
771
772 bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const;
773
774 /// \brief Check whether input signature is a valid signature for input message
775 /// \param stream an std::istream derived class
776 /// \param signature a pointer to the signature over the message
777 /// \param signatureLen the size of the signature
778 /// \return true if the signature is valid, false otherwise
779 /// \details VerifyStream() handles large streams. The Stream functions were added to
780 /// ed25519 for signing and verifying files that are too large for a memory allocation.
781 /// The functions are not present in other library signers and verifiers.
782 /// \since Crypto++ 8.1
783 bool VerifyStream(std::istream& stream, const byte *signature, size_t signatureLen) const;
784
785 DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const {
786 CRYPTOPP_UNUSED(recoveredMessage); CRYPTOPP_UNUSED(messageAccumulator);
787 throw NotImplemented("ed25519Verifier: this object does not support recoverable messages");
788 }
789
790 protected:
791 ed25519PublicKey m_key;
792 };
793
794 /// \brief Ed25519 signature scheme
795 /// \sa <A HREF="http://cryptopp.com/wiki/Ed25519">Ed25519</A> on the Crypto++ wiki.
796 /// \since Crypto++ 8.0
797 struct ed25519
798 {
799 /// \brief ed25519 Signer
800 typedef ed25519Signer Signer;
801 /// \brief ed25519 Verifier
802 typedef ed25519Verifier Verifier;
803 };
804
805 NAMESPACE_END // CryptoPP
806
807 #endif // CRYPTOPP_XED25519_H
x25519
x25519 with key validation
Definition: xed25519.h:54
ed25519PrivateKey::Save
void Save(BufferedTransformation &bt) const
DER encode ASN.1 object.
Definition: xed25519.h:390
x25519::SHARED_KEYLENGTH
static const int SHARED_KEYLENGTH
Size of the shared key.
Definition: xed25519.h:65
x25519::PublicKeyLength
unsigned int PublicKeyLength() const
Provides the size of the public key.
Definition: xed25519.h:238
ed25519PrivateKey
Ed25519 private key.
Definition: xed25519.h:355
ed25519PrivateKey::Save
void Save(BufferedTransformation &bt, bool v1) const
DER encode ASN.1 object.
Definition: xed25519.h:409
x25519::x25519
x25519()
Create a x25519 object.
Definition: xed25519.h:74
ed25519PublicKey::Load
void Load(BufferedTransformation &bt)
BER decode ASN.1 object.
Definition: xed25519.h:653
x25519::GenerateRandom
void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params)
Generate a random key or crypto parameters.
Definition: xed25519.cpp:340
ed25519Verifier::IsProbabilistic
bool IsProbabilistic() const
Determines whether a signature scheme requires a random number generator.
Definition: xed25519.h:756
x25519::DEREncode
void DEREncode(BufferedTransformation &bt) const
Encode this object into a BufferedTransformation.
Definition: xed25519.h:200
ed25519Verifier::RecoverAndRestart
DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const
Recover a message from its signature.
Definition: xed25519.h:785
pubkey.h
This file contains helper classes/functions for implementing public key algorithms.
ed25519Signer::MaxRecoverableLength
size_t MaxRecoverableLength() const
Provides the length of longest message that can be recovered.
Definition: xed25519.h:567
ed25519PublicKey::GetPublicKeyBytePtr
const byte * GetPublicKeyBytePtr() const
Retrieve public key byte array.
Definition: xed25519.h:689
PKCS8PrivateKey
Encodes and Decodes privateKeyInfo.
Definition: asn.h:747
ed25519Verifier
Ed25519 signature verification algorithm.
Definition: xed25519.h:701
ed25519Verifier::AccessKey
PublicKey & AccessKey()
Retrieves a reference to a Public Key.
Definition: xed25519.h:741
PK_Signer
Interface for public-key signers.
Definition: cryptlib.h:2855
cryptlib.h
Abstract base classes that provide a uniform interface to this library.
ed25519_MessageAccumulator::Update
void Update(const byte *msg, size_t len)
Add data to the accumulator.
Definition: xed25519.h:298
ed25519Signer::AllowNonrecoverablePart
bool AllowNonrecoverablePart() const
Determines whether the non-recoverable message part can be signed.
Definition: xed25519.h:573
oids.h
ASN.1 object identifiers for algorthms and schemes.
ed25519Signer::IsProbabilistic
bool IsProbabilistic() const
Determines whether a signature scheme requires a random number generator.
Definition: xed25519.h:572
ed25519Verifier::AllowNonrecoverablePart
bool AllowNonrecoverablePart() const
Determines whether the non-recoverable message part can be signed.
Definition: xed25519.h:757
ed25519Verifier::InputSignature
void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const
Input signature into a message accumulator.
Definition: xed25519.h:764
ed25519_MessageAccumulator::Restart
void Restart()
Reset the accumulator.
Definition: xed25519.h:304
ed25519_MessageAccumulator::size
size_t size() const
Retrieve size of data buffer.
Definition: xed25519.h:329
x25519::GeneratePublicKey
void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const
Generate a public key from a private key in this domain.
Definition: xed25519.cpp:357
ed25519Signer::AccessKey
PrivateKey & AccessKey()
Retrieves a reference to a Private Key.
Definition: xed25519.h:557
RandomNumberGenerator
Interface for random number generators.
Definition: cryptlib.h:1413
ed25519Verifier::ed25519Verifier
ed25519Verifier()
Create a ed25519Verifier object.
Definition: xed25519.h:710
x25519::SECRET_KEYLENGTH
static const int SECRET_KEYLENGTH
Size of the private key.
Definition: xed25519.h:59
ed25519::Signer
ed25519Signer Signer
ed25519 Signer
Definition: xed25519.h:800
BufferedTransformation
Interface for buffered transformations.
Definition: cryptlib.h:1630
PrivateKey
Interface for private keys.
Definition: cryptlib.h:2519
ed25519PublicKey::GetAlgorithmID
OID GetAlgorithmID() const
Retrieves the OID of the algorithm.
Definition: xed25519.h:632
ed25519Signer::MaxRecoverableLengthFromSignatureLength
size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const
Provides the length of longest message that can be recovered from a signature of given length...
Definition: xed25519.h:568
ed25519Verifier::AccessPublicKey
PublicKey & AccessPublicKey()
Retrieves a reference to a Public Key.
Definition: xed25519.h:742
ed25519Verifier::GetPublicKey
const PublicKey & GetPublicKey() const
Retrieves a reference to a Public Key.
Definition: xed25519.h:747
OID::Empty
bool Empty() const
Determine if OID is empty.
Definition: asn.h:311
SimpleKeyAgreementDomain
Interface for domains of simple key agreement protocols.
Definition: cryptlib.h:2991
ed25519_MessageAccumulator::signature
const byte * signature() const
Retrieve pointer to signature buffer.
Definition: xed25519.h:317
DecodingResult
Returns a decoding results.
Definition: cryptlib.h:277
x25519::ClampKey
void ClampKey(byte x[SECRET_KEYLENGTH]) const
Clamp a private key.
Definition: xed25519.cpp:128
x25519::GeneratePrivateKey
void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const
Generate private key in this domain.
Definition: xed25519.cpp:351
ed25519_MessageAccumulator::data
const byte * data() const
Retrieve pointer to data buffer.
Definition: xed25519.h:323
NotImplemented
A method was called which was not implemented.
Definition: cryptlib.h:232
x25519::SetAlgorithmID
void SetAlgorithmID(const OID &oid)
Set the Object Identifier.
Definition: xed25519.h:144
ed25519Verifier::RecoverablePartFirst
bool RecoverablePartFirst() const
Determines whether the recoverable part must be input before the non-recoverable part.
Definition: xed25519.h:758
x25519::GetVoidValue
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
Get a named value.
Definition: xed25519.cpp:287
x25519::PUBLIC_KEYLENGTH
static const int PUBLIC_KEYLENGTH
Size of the public key.
Definition: xed25519.h:62
x25519::PrivateKeyLength
unsigned int PrivateKeyLength() const
Provides the size of the private key.
Definition: xed25519.h:237
ed25519Verifier::GetKey
const PublicKey & GetKey() const
Retrieves a reference to a Public Key.
Definition: xed25519.h:746
Integer
Multiple precision integer with arithmetic operations.
Definition: integer.h:49
ed25519Verifier::SignatureLength
size_t SignatureLength() const
Provides the signature length if it only depends on the key.
Definition: xed25519.h:750
ed25519Signer::GetPrivateKey
const PrivateKey & GetPrivateKey() const
Retrieves a reference to a Private Key.
Definition: xed25519.h:563
ed25519PrivateKey::DEREncode
void DEREncode(BufferedTransformation &bt) const
Encode this object into a BufferedTransformation.
Definition: xed25519.h:427
ed25519Signer::InputRecoverableMessage
void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const
Input a recoverable message to an accumulator.
Definition: xed25519.h:580
ed25519Signer::RecoverablePartFirst
bool RecoverablePartFirst() const
Determines whether the recoverable part must be input before the non-recoverable part.
Definition: xed25519.h:574
FixedSizeSecBlock< byte, SECRET_KEYLENGTH >
x25519::BERDecode
void BERDecode(BufferedTransformation &bt)
Decode this object from a BufferedTransformation.
Definition: xed25519.cpp:163
ed25519Signer::NewSignatureAccumulator
PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const
Create a new HashTransformation to accumulate the message to be signed.
Definition: xed25519.h:576
x25519::BERDecodePrivateKey
void BERDecodePrivateKey(BufferedTransformation &bt, bool parametersPresent, size_t size)
Decode privateKey part of privateKeyInfo.
Definition: xed25519.cpp:235
STDMIN
const T & STDMIN(const T &a, const T &b)
Replacement function for std::min.
Definition: misc.h:635
CRYPTOPP_ASSERT
#define CRYPTOPP_ASSERT(exp)
Debugging and diagnostic assertion.
Definition: trap.h:68
x25519::Save
void Save(BufferedTransformation &bt, bool v1) const
DER encode ASN.1 object.
Definition: xed25519.h:186
ed25519_MessageAccumulator
ed25519 message accumulator
Definition: xed25519.h:278
x25519::Validate
bool Validate(RandomNumberGenerator &rng, unsigned int level) const
Check this object for errors.
Definition: xed25519.cpp:264
ed25519Signer
Ed25519 signature algorithm.
Definition: xed25519.h:496
PK_MessageAccumulator
Interface for accumulating messages to be signed or verified.
Definition: cryptlib.h:2839
ed25519_MessageAccumulator::ed25519_MessageAccumulator
ed25519_MessageAccumulator(RandomNumberGenerator &rng)
Create a message accumulator.
Definition: xed25519.h:291
ed25519::Verifier
ed25519Verifier Verifier
ed25519 Verifier
Definition: xed25519.h:802
x25519::IsClamped
bool IsClamped(const byte x[SECRET_KEYLENGTH]) const
Determine if private key is clamped.
Definition: xed25519.cpp:133
ed25519Signer::GetKey
const PrivateKey & GetKey() const
Retrieves a reference to a Private Key.
Definition: xed25519.h:562
x25519::Save
void Save(BufferedTransformation &bt) const
DER encode ASN.1 object.
Definition: xed25519.h:167
x25519::IsSmallOrder
bool IsSmallOrder(const byte y[PUBLIC_KEYLENGTH]) const
Test if a key has small order.
Definition: xed25519.cpp:138
PK_Verifier
Interface for public-key signature verifiers.
Definition: cryptlib.h:2919
x25519::AccessCryptoParameters
CryptoParameters & AccessCryptoParameters()
Retrieves a reference to Crypto Parameters.
Definition: xed25519.h:154
x25519::GetAlgorithmID
OID GetAlgorithmID() const
Get the Object Identifier.
Definition: xed25519.h:138
ed25519PrivateKey::Load
void Load(BufferedTransformation &bt)
BER decode ASN.1 object.
Definition: xed25519.h:417
ed25519Verifier::MaxRecoverableLength
size_t MaxRecoverableLength() const
Provides the length of longest message that can be recovered.
Definition: xed25519.h:751
ed25519PublicKey::Save
void Save(BufferedTransformation &bt) const
DER encode ASN.1 object.
Definition: xed25519.h:645
ed25519Signer::AccessPrivateKey
PrivateKey & AccessPrivateKey()
Retrieves a reference to a Private Key.
Definition: xed25519.h:558
CryptoParameters
Interface for crypto prameters.
Definition: cryptlib.h:2524
ed25519Verifier::MaxRecoverableLengthFromSignatureLength
size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const
Provides the length of longest message that can be recovered from a signature of given length...
Definition: xed25519.h:752
PublicKey
Interface for public keys.
Definition: cryptlib.h:2514
CryptoPP
Crypto++ library namespace.
X509PublicKey
Encodes and decodes subjectPublicKeyInfo.
Definition: asn.h:701
x25519::Agree
bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const
Derive agreed value.
Definition: xed25519.cpp:363
ed25519Signer::ed25519Signer
ed25519Signer()
Create a ed25519Signer object.
Definition: xed25519.h:514
ed25519PrivateKey::GetPrivateKeyBytePtr
const byte * GetPrivateKeyBytePtr() const
Retrieve private key byte array.
Definition: xed25519.h:472
x25519::AgreedValueLength
unsigned int AgreedValueLength() const
Provides the size of the agreed value.
Definition: xed25519.h:236
ed25519PrivateKey::GetAlgorithmID
OID GetAlgorithmID() const
Retrieves the OID of the algorithm.
Definition: xed25519.h:375
ed25519PublicKey
Ed25519 public key.
Definition: xed25519.h:625
ed25519
Ed25519 signature scheme.
Definition: xed25519.h:797
x25519::AssignFrom
void AssignFrom(const NameValuePairs &source)
Assign values to this object.
Definition: xed25519.cpp:316
OID
Object Identifier.
Definition: asn.h:264
ed25519_MessageAccumulator::ed25519_MessageAccumulator
ed25519_MessageAccumulator()
Create a message accumulator.
Definition: xed25519.h:284
x25519::BERDecodeAndCheckAlgorithmID
void BERDecodeAndCheckAlgorithmID(BufferedTransformation &bt)
Determine if OID is valid for this object.
Definition: xed25519.cpp:148
ed25519Signer::SignatureLength
size_t SignatureLength() const
Provides the signature length if it only depends on the key.
Definition: xed25519.h:566
x25519::DEREncodePrivateKey
void DEREncodePrivateKey(BufferedTransformation &bt) const
Encode privateKey part of privateKeyInfo.
Definition: xed25519.cpp:256
x25519::Load
void Load(BufferedTransformation &bt)
BER decode ASN.1 object.
Definition: xed25519.h:194
ed25519PrivateKey::GetPublicKeyBytePtr
const byte * GetPublicKeyBytePtr() const
Retrieve public key byte array.
Definition: xed25519.h:479
ed25519Verifier::NewVerificationAccumulator
ed25519_MessageAccumulator * NewVerificationAccumulator() const
Create a new HashTransformation to accumulate the message to be verified.
Definition: xed25519.h:760
ed25519_MessageAccumulator::signature
byte * signature()
Retrieve pointer to signature buffer.
Definition: xed25519.h:311
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:321