11515086960

Committed 25 Oct 2024 08:55AM UTC coverage: 91.138% (-0.001%) from 91.139%

Build # 11515086960

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web-flow

Commit Message

Merge pull request #4404 from randombit/jack/bump-to-361

Bump news and version to 3.6.1

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94.12

/src/lib/misc/cryptobox/cryptobox.cpp

/*
* Cryptobox Message Routines
* (C) 2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/cryptobox.h>

#include <botan/cipher_mode.h>
#include <botan/data_src.h>
#include <botan/mac.h>
#include <botan/mem_ops.h>
#include <botan/pem.h>
#include <botan/pwdhash.h>
#include <botan/rng.h>
#include <botan/internal/ct_utils.h>
#include <botan/internal/loadstor.h>

namespace Botan::CryptoBox {

namespace {

/*
First 24 bits of SHA-256("Botan Cryptobox"), followed by 8 0 bits
for later use as flags, etc if needed
*/
const uint32_t CRYPTOBOX_VERSION_CODE = 0xEFC22400;

const size_t VERSION_CODE_LEN = 4;
const size_t CIPHER_KEY_LEN = 32;
const size_t CIPHER_IV_LEN = 16;
const size_t MAC_KEY_LEN = 32;
const size_t MAC_OUTPUT_LEN = 20;
const size_t PBKDF_SALT_LEN = 10;
const size_t PBKDF_ITERATIONS = 8 * 1024;

const size_t CRYPTOBOX_HEADER_LEN = VERSION_CODE_LEN + PBKDF_SALT_LEN + MAC_OUTPUT_LEN;

}  // namespace

std::string encrypt(const uint8_t input[], size_t input_len, std::string_view passphrase, RandomNumberGenerator& rng) {
   /*
   Output format is:
      version # (4 bytes)
      salt (10 bytes)
      mac (20 bytes)
      ciphertext
   */
   secure_vector<uint8_t> out_buf(CRYPTOBOX_HEADER_LEN + input_len);
   store_be(CRYPTOBOX_VERSION_CODE, out_buf.data());
   rng.randomize(&out_buf[VERSION_CODE_LEN], PBKDF_SALT_LEN);
   // space left for MAC here
   if(input_len > 0) {
      copy_mem(&out_buf[CRYPTOBOX_HEADER_LEN], input, input_len);
   }

   // Generate the keys and IV

   auto pbkdf_fam = PasswordHashFamily::create_or_throw("PBKDF2(HMAC(SHA-512))");
   auto pbkdf = pbkdf_fam->from_params(PBKDF_ITERATIONS);

   secure_vector<uint8_t> master_key(CIPHER_KEY_LEN + MAC_KEY_LEN + CIPHER_IV_LEN);

   pbkdf->derive_key(master_key.data(),
                     master_key.size(),
                     passphrase.data(),
                     passphrase.size(),
                     &out_buf[VERSION_CODE_LEN],
                     PBKDF_SALT_LEN);

   const uint8_t* mk = master_key.data();
   const uint8_t* cipher_key = mk;
   const uint8_t* mac_key = mk + CIPHER_KEY_LEN;
   const uint8_t* iv = mk + CIPHER_KEY_LEN + MAC_KEY_LEN;

   // Now encrypt and authenticate
   auto ctr = Cipher_Mode::create_or_throw("Serpent/CTR-BE", Cipher_Dir::Encryption);
   ctr->set_key(cipher_key, CIPHER_KEY_LEN);
   ctr->start(iv, CIPHER_IV_LEN);
   ctr->finish(out_buf, CRYPTOBOX_HEADER_LEN);

   std::unique_ptr<MessageAuthenticationCode> hmac = MessageAuthenticationCode::create_or_throw("HMAC(SHA-512)");
   hmac->set_key(mac_key, MAC_KEY_LEN);
   if(input_len > 0) {
      hmac->update(&out_buf[CRYPTOBOX_HEADER_LEN], input_len);
   }

   // Can't write directly because of MAC truncation
   secure_vector<uint8_t> mac = hmac->final();
   copy_mem(&out_buf[VERSION_CODE_LEN + PBKDF_SALT_LEN], mac.data(), MAC_OUTPUT_LEN);

   return PEM_Code::encode(out_buf, "BOTAN CRYPTOBOX MESSAGE");
}

secure_vector<uint8_t> decrypt_bin(const uint8_t input[], size_t input_len, std::string_view passphrase) {
   DataSource_Memory input_src(input, input_len);
   secure_vector<uint8_t> ciphertext = PEM_Code::decode_check_label(input_src, "BOTAN CRYPTOBOX MESSAGE");

   if(ciphertext.size() < CRYPTOBOX_HEADER_LEN) {
      throw Decoding_Error("Invalid CryptoBox input");
   }

   for(size_t i = 0; i != VERSION_CODE_LEN; ++i) {
      uint32_t version = load_be<uint32_t>(ciphertext.data(), 0);
      if(version != CRYPTOBOX_VERSION_CODE) {
         throw Decoding_Error("Bad CryptoBox version");
      }
   }

   const uint8_t* pbkdf_salt = &ciphertext[VERSION_CODE_LEN];
   const uint8_t* box_mac = &ciphertext[VERSION_CODE_LEN + PBKDF_SALT_LEN];

   auto pbkdf_fam = PasswordHashFamily::create_or_throw("PBKDF2(HMAC(SHA-512))");
   auto pbkdf = pbkdf_fam->from_params(PBKDF_ITERATIONS);

   secure_vector<uint8_t> master_key(CIPHER_KEY_LEN + MAC_KEY_LEN + CIPHER_IV_LEN);

   pbkdf->derive_key(
      master_key.data(), master_key.size(), passphrase.data(), passphrase.size(), pbkdf_salt, PBKDF_SALT_LEN);

   const uint8_t* mk = master_key.data();
   const uint8_t* cipher_key = mk;
   const uint8_t* mac_key = mk + CIPHER_KEY_LEN;
   const uint8_t* iv = mk + CIPHER_KEY_LEN + MAC_KEY_LEN;

   // Now authenticate and decrypt
   std::unique_ptr<MessageAuthenticationCode> hmac = MessageAuthenticationCode::create_or_throw("HMAC(SHA-512)");
   hmac->set_key(mac_key, MAC_KEY_LEN);

   if(ciphertext.size() > CRYPTOBOX_HEADER_LEN) {
      hmac->update(&ciphertext[CRYPTOBOX_HEADER_LEN], ciphertext.size() - CRYPTOBOX_HEADER_LEN);
   }
   secure_vector<uint8_t> computed_mac = hmac->final();

   if(!CT::is_equal(computed_mac.data(), box_mac, MAC_OUTPUT_LEN).as_bool()) {
      throw Decoding_Error("CryptoBox integrity failure");
   }

   auto ctr = Cipher_Mode::create_or_throw("Serpent/CTR-BE", Cipher_Dir::Decryption);
   ctr->set_key(cipher_key, CIPHER_KEY_LEN);
   ctr->start(iv, CIPHER_IV_LEN);
   ctr->finish(ciphertext, CRYPTOBOX_HEADER_LEN);

   ciphertext.erase(ciphertext.begin(), ciphertext.begin() + CRYPTOBOX_HEADER_LEN);
   return ciphertext;
}

BOTAN_DIAGNOSTIC_PUSH
BOTAN_DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS

secure_vector<uint8_t> decrypt_bin(std::string_view input, std::string_view passphrase) {
   return decrypt_bin(cast_char_ptr_to_uint8(input.data()), input.size(), passphrase);
}

std::string decrypt(const uint8_t input[], size_t input_len, std::string_view passphrase) {
   const secure_vector<uint8_t> bin = decrypt_bin(input, input_len, passphrase);

   return std::string(cast_uint8_ptr_to_char(&bin[0]), bin.size());
}

std::string decrypt(std::string_view input, std::string_view passphrase) {
   return decrypt(cast_char_ptr_to_uint8(input.data()), input.size(), passphrase);
}

BOTAN_DIAGNOSTIC_POP

}  // namespace Botan::CryptoBox

1	/*
2	* Cryptobox Message Routines
3	* (C) 2009 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/cryptobox.h>
9
10	#include <botan/cipher_mode.h>
11	#include <botan/data_src.h>
12	#include <botan/mac.h>
13	#include <botan/mem_ops.h>
14	#include <botan/pem.h>
15	#include <botan/pwdhash.h>
16	#include <botan/rng.h>
17	#include <botan/internal/ct_utils.h>
18	#include <botan/internal/loadstor.h>
19
20	namespace Botan::CryptoBox {
21
22	namespace {
23
24	/*
25	First 24 bits of SHA-256("Botan Cryptobox"), followed by 8 0 bits
26	for later use as flags, etc if needed
27	*/
28	const uint32_t CRYPTOBOX_VERSION_CODE = 0xEFC22400;
29
30	const size_t VERSION_CODE_LEN = 4;
31	const size_t CIPHER_KEY_LEN = 32;
32	const size_t CIPHER_IV_LEN = 16;
33	const size_t MAC_KEY_LEN = 32;
34	const size_t MAC_OUTPUT_LEN = 20;
35	const size_t PBKDF_SALT_LEN = 10;
36	const size_t PBKDF_ITERATIONS = 8 * 1024;
37
38	const size_t CRYPTOBOX_HEADER_LEN = VERSION_CODE_LEN + PBKDF_SALT_LEN + MAC_OUTPUT_LEN;
39
40	} // namespace
41
42	std::string encrypt(const uint8_t input[], size_t input_len, std::string_view passphrase, RandomNumberGenerator& rng) {	18✔
43	/*
44	Output format is:
45	version # (4 bytes)
46	salt (10 bytes)
47	mac (20 bytes)
48	ciphertext
49	*/
50	secure_vector<uint8_t> out_buf(CRYPTOBOX_HEADER_LEN + input_len);	18✔
51	store_be(CRYPTOBOX_VERSION_CODE, out_buf.data());	18✔
52	rng.randomize(&out_buf[VERSION_CODE_LEN], PBKDF_SALT_LEN);	18✔
53	// space left for MAC here
54	if(input_len > 0) {	18✔
55	copy_mem(&out_buf[CRYPTOBOX_HEADER_LEN], input, input_len);	17✔
56	}
57
58	// Generate the keys and IV
59
60	auto pbkdf_fam = PasswordHashFamily::create_or_throw("PBKDF2(HMAC(SHA-512))");	18✔
61	auto pbkdf = pbkdf_fam->from_params(PBKDF_ITERATIONS);	18✔
62
63	secure_vector<uint8_t> master_key(CIPHER_KEY_LEN + MAC_KEY_LEN + CIPHER_IV_LEN);	18✔
64
65	pbkdf->derive_key(master_key.data(),	18✔
66	master_key.size(),
67	passphrase.data(),
68	passphrase.size(),
69	&out_buf[VERSION_CODE_LEN],	18✔
70	PBKDF_SALT_LEN);
71
72	const uint8_t* mk = master_key.data();	18✔
73	const uint8_t* cipher_key = mk;	18✔
74	const uint8_t* mac_key = mk + CIPHER_KEY_LEN;	18✔
75	const uint8_t* iv = mk + CIPHER_KEY_LEN + MAC_KEY_LEN;	18✔
76
77	// Now encrypt and authenticate
78	auto ctr = Cipher_Mode::create_or_throw("Serpent/CTR-BE", Cipher_Dir::Encryption);	18✔
79	ctr->set_key(cipher_key, CIPHER_KEY_LEN);	18✔
80	ctr->start(iv, CIPHER_IV_LEN);	18✔
81	ctr->finish(out_buf, CRYPTOBOX_HEADER_LEN);	18✔
82
83	std::unique_ptr<MessageAuthenticationCode> hmac = MessageAuthenticationCode::create_or_throw("HMAC(SHA-512)");	18✔
84	hmac->set_key(mac_key, MAC_KEY_LEN);	18✔
85	if(input_len > 0) {	18✔
86	hmac->update(&out_buf[CRYPTOBOX_HEADER_LEN], input_len);	17✔
87	}
88
89	// Can't write directly because of MAC truncation
90	secure_vector<uint8_t> mac = hmac->final();	18✔
91	copy_mem(&out_buf[VERSION_CODE_LEN + PBKDF_SALT_LEN], mac.data(), MAC_OUTPUT_LEN);	18✔
92
93	return PEM_Code::encode(out_buf, "BOTAN CRYPTOBOX MESSAGE");	18✔
94	}	126✔
95
96	secure_vector<uint8_t> decrypt_bin(const uint8_t input[], size_t input_len, std::string_view passphrase) {	36✔
97	DataSource_Memory input_src(input, input_len);	36✔
98	secure_vector<uint8_t> ciphertext = PEM_Code::decode_check_label(input_src, "BOTAN CRYPTOBOX MESSAGE");	54✔
99
100	if(ciphertext.size() < CRYPTOBOX_HEADER_LEN) {	36✔
101	throw Decoding_Error("Invalid CryptoBox input");	×
102	}
103
104	for(size_t i = 0; i != VERSION_CODE_LEN; ++i) {	180✔
105	uint32_t version = load_be<uint32_t>(ciphertext.data(), 0);	144✔
106	if(version != CRYPTOBOX_VERSION_CODE) {	144✔
107	throw Decoding_Error("Bad CryptoBox version");	×
108	}
109	}
110
111	const uint8_t* pbkdf_salt = &ciphertext[VERSION_CODE_LEN];	36✔
112	const uint8_t* box_mac = &ciphertext[VERSION_CODE_LEN + PBKDF_SALT_LEN];	36✔
113
114	auto pbkdf_fam = PasswordHashFamily::create_or_throw("PBKDF2(HMAC(SHA-512))");	54✔
115	auto pbkdf = pbkdf_fam->from_params(PBKDF_ITERATIONS);	36✔
116
117	secure_vector<uint8_t> master_key(CIPHER_KEY_LEN + MAC_KEY_LEN + CIPHER_IV_LEN);	54✔
118
119	pbkdf->derive_key(	36✔
120	master_key.data(), master_key.size(), passphrase.data(), passphrase.size(), pbkdf_salt, PBKDF_SALT_LEN);
121
122	const uint8_t* mk = master_key.data();	36✔
123	const uint8_t* cipher_key = mk;	36✔
124	const uint8_t* mac_key = mk + CIPHER_KEY_LEN;	36✔
125	const uint8_t* iv = mk + CIPHER_KEY_LEN + MAC_KEY_LEN;	36✔
126
127	// Now authenticate and decrypt
128	std::unique_ptr<MessageAuthenticationCode> hmac = MessageAuthenticationCode::create_or_throw("HMAC(SHA-512)");	54✔
129	hmac->set_key(mac_key, MAC_KEY_LEN);	36✔
130
131	if(ciphertext.size() > CRYPTOBOX_HEADER_LEN) {	36✔
132	hmac->update(&ciphertext[CRYPTOBOX_HEADER_LEN], ciphertext.size() - CRYPTOBOX_HEADER_LEN);	34✔
133	}
134	secure_vector<uint8_t> computed_mac = hmac->final();	36✔
135
136	if(!CT::is_equal(computed_mac.data(), box_mac, MAC_OUTPUT_LEN).as_bool()) {	72✔
137	throw Decoding_Error("CryptoBox integrity failure");	18✔
138	}
139
140	auto ctr = Cipher_Mode::create_or_throw("Serpent/CTR-BE", Cipher_Dir::Decryption);	54✔
141	ctr->set_key(cipher_key, CIPHER_KEY_LEN);	18✔
142	ctr->start(iv, CIPHER_IV_LEN);	18✔
143	ctr->finish(ciphertext, CRYPTOBOX_HEADER_LEN);	18✔
144
145	ciphertext.erase(ciphertext.begin(), ciphertext.begin() + CRYPTOBOX_HEADER_LEN);	18✔
146	return ciphertext;	18✔
147	}	234✔
148
149	BOTAN_DIAGNOSTIC_PUSH
150	BOTAN_DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS
151
152	secure_vector<uint8_t> decrypt_bin(std::string_view input, std::string_view passphrase) {	18✔
153	return decrypt_bin(cast_char_ptr_to_uint8(input.data()), input.size(), passphrase);	18✔
154	}
155
156	std::string decrypt(const uint8_t input[], size_t input_len, std::string_view passphrase) {	18✔
157	const secure_vector<uint8_t> bin = decrypt_bin(input, input_len, passphrase);	18✔
158
159	return std::string(cast_uint8_ptr_to_char(&bin[0]), bin.size());	×
160	}	×
161
162	std::string decrypt(std::string_view input, std::string_view passphrase) {	18✔
163	return decrypt(cast_char_ptr_to_uint8(input.data()), input.size(), passphrase);	18✔
164	}
165
166	BOTAN_DIAGNOSTIC_POP
167
168	} // namespace Botan::CryptoBox

randombit / botan / 11515086960

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