Botan 2.1.0 Crypto and TLS for C++11

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keypair.cpp
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1 /*
2 * Keypair Checks
3 * (C) 1999-2010 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7
8 #include <botan/keypair.h>
9 #include <botan/pubkey.h>
10
11 namespace Botan {
12
13 namespace KeyPair {
14
15 /*
16 * Check an encryption key pair for consistency
17 */
18 bool encryption_consistency_check(RandomNumberGenerator& rng,
19 const Private_Key& private_key,
20 const Public_Key& public_key,
21 const std::string& padding)
22 {
23 PK_Encryptor_EME encryptor(public_key, rng, padding);
24 PK_Decryptor_EME decryptor(private_key, rng, padding);
25
26 /*
27 Weird corner case, if the key is too small to encrypt anything at
28 all. This can happen with very small RSA keys with PSS
29 */
30 if(encryptor.maximum_input_size() == 0)
31 return true;
32
33 std::vector<uint8_t> plaintext =
34 unlock(rng.random_vec(encryptor.maximum_input_size() - 1));
35
36 std::vector<uint8_t> ciphertext = encryptor.encrypt(plaintext, rng);
37 if(ciphertext == plaintext)
38 return false;
39
40 std::vector<uint8_t> decrypted = unlock(decryptor.decrypt(ciphertext));
41
42 return (plaintext == decrypted);
43 }
44
45 /*
46 * Check a signature key pair for consistency
47 */
48 bool signature_consistency_check(RandomNumberGenerator& rng,
49 const Private_Key& private_key,
50 const Public_Key& public_key,
51 const std::string& padding)
52 {
53 PK_Signer signer(private_key, rng, padding);
54 PK_Verifier verifier(public_key, padding);
55
56 std::vector<uint8_t> message(32);
57 rng.randomize(message.data(), message.size());
58
59 std::vector<uint8_t> signature;
60
61 try
62 {
63 signature = signer.sign_message(message, rng);
64 }
65 catch(Encoding_Error&)
66 {
67 return false;
68 }
69
70 if(!verifier.verify_message(message, signature))
71 return false;
72
73 // Now try to check a corrupt signature, ensure it does not succeed
74 ++signature[0];
75
76 if(verifier.verify_message(message, signature))
77 return false;
78
79 return true;
80 }
81
82 }
83
84 }
Botan::RandomNumberGenerator::random_vec
secure_vector< uint8_t > random_vec(size_t bytes)
Definition: rng.h:133
Botan::KeyPair::encryption_consistency_check
bool encryption_consistency_check(RandomNumberGenerator &rng, const Private_Key &private_key, const Public_Key &public_key, const std::string &padding)
Definition: keypair.cpp:18
Botan::PK_Verifier::verify_message
bool verify_message(const uint8_t msg[], size_t msg_length, const uint8_t sig[], size_t sig_length)
Definition: pubkey.cpp:280
Botan::RandomNumberGenerator
Definition: rng.h:25
Botan::RandomNumberGenerator::randomize
virtual void randomize(uint8_t output[], size_t length)=0
Botan::Private_Key
Definition: pk_keys.h:166
Botan::PK_Decryptor::decrypt
secure_vector< uint8_t > decrypt(const uint8_t in[], size_t length) const
Definition: pubkey.cpp:16
Botan::PK_Signer::sign_message
std::vector< uint8_t > sign_message(const uint8_t in[], size_t length, RandomNumberGenerator &rng)
Definition: pubkey.h:209
Botan::PK_Encryptor::encrypt
std::vector< uint8_t > encrypt(const uint8_t in[], size_t length, RandomNumberGenerator &rng) const
Definition: pubkey.h:46
Botan::PK_Decryptor_EME
Definition: pubkey.h:554
Botan::PK_Encryptor_EME::maximum_input_size
size_t maximum_input_size() const override
Definition: pubkey.cpp:104
Botan::KeyPair::signature_consistency_check
bool signature_consistency_check(RandomNumberGenerator &rng, const Private_Key &private_key, const Public_Key &public_key, const std::string &padding)
Definition: keypair.cpp:48
Botan
Definition: alg_id.cpp:13
Botan::PK_Verifier
Definition: pubkey.h:288
Botan::PK_Encryptor_EME
Definition: pubkey.h:510
Botan::Public_Key
Definition: pk_keys.h:24
Botan::unlock
std::vector< T > unlock(const secure_vector< T > &in)
Definition: secmem.h:125
Botan::PK_Signer
Definition: pubkey.h:161
Botan::Encoding_Error
Definition: exceptn.h:180