5079590438

Committed 25 May 2023 12:28PM UTC coverage: 92.228% (+0.5%) from 91.723%

Build # 5079590438

Build Type

Pull #3502

github

Pull Request Pull Request #3502: Apply clang-format to the codebase

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95.59

/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/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;

}

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(!constant_time_compare(computed_mac.data(), box_mac, MAC_OUTPUT_LEN))
      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

}

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/loadstor.h>
18
19	namespace Botan::CryptoBox {
20
21	namespace {
22
23	/*
24	First 24 bits of SHA-256("Botan Cryptobox"), followed by 8 0 bits
25	for later use as flags, etc if needed
26	*/
27	const uint32_t CRYPTOBOX_VERSION_CODE = 0xEFC22400;
28
29	const size_t VERSION_CODE_LEN = 4;
30	const size_t CIPHER_KEY_LEN = 32;
31	const size_t CIPHER_IV_LEN = 16;
32	const size_t MAC_KEY_LEN = 32;
33	const size_t MAC_OUTPUT_LEN = 20;
34	const size_t PBKDF_SALT_LEN = 10;
35	const size_t PBKDF_ITERATIONS = 8 * 1024;
36
37	const size_t CRYPTOBOX_HEADER_LEN = VERSION_CODE_LEN + PBKDF_SALT_LEN + MAC_OUTPUT_LEN;
38
39	}
40
41	std::string encrypt(const uint8_t input[], size_t input_len, std::string_view passphrase, RandomNumberGenerator& rng) {	18✔
42	/*
43	Output format is:
44	version # (4 bytes)
45	salt (10 bytes)
46	mac (20 bytes)
47	ciphertext
48	*/
49	secure_vector<uint8_t> out_buf(CRYPTOBOX_HEADER_LEN + input_len);	18✔
50	store_be(CRYPTOBOX_VERSION_CODE, out_buf.data());	18✔
51	rng.randomize(&out_buf[VERSION_CODE_LEN], PBKDF_SALT_LEN);	18✔
52	// space left for MAC here
53	if(input_len > 0)	18✔
54	copy_mem(&out_buf[CRYPTOBOX_HEADER_LEN], input, input_len);	17✔
55
56	// Generate the keys and IV
57
58	auto pbkdf_fam = PasswordHashFamily::create_or_throw("PBKDF2(HMAC(SHA-512))");	18✔
59	auto pbkdf = pbkdf_fam->from_params(PBKDF_ITERATIONS);	18✔
60
61	secure_vector<uint8_t> master_key(CIPHER_KEY_LEN + MAC_KEY_LEN + CIPHER_IV_LEN);	18✔
62
63	pbkdf->derive_key(master_key.data(),	18✔
64	master_key.size(),
65	passphrase.data(),
66	passphrase.size(),
67	&out_buf[VERSION_CODE_LEN],	18✔
68	PBKDF_SALT_LEN);
69
70	const uint8_t* mk = master_key.data();	18✔
71	const uint8_t* cipher_key = mk;	18✔
72	const uint8_t* mac_key = mk + CIPHER_KEY_LEN;	18✔
73	const uint8_t* iv = mk + CIPHER_KEY_LEN + MAC_KEY_LEN;	18✔
74
75	// Now encrypt and authenticate
76	auto ctr = Cipher_Mode::create_or_throw("Serpent/CTR-BE", Cipher_Dir::Encryption);	18✔
77	ctr->set_key(cipher_key, CIPHER_KEY_LEN);	18✔
78	ctr->start(iv, CIPHER_IV_LEN);	18✔
79	ctr->finish(out_buf, CRYPTOBOX_HEADER_LEN);	18✔
80
81	std::unique_ptr<MessageAuthenticationCode> hmac = MessageAuthenticationCode::create_or_throw("HMAC(SHA-512)");	18✔
82	hmac->set_key(mac_key, MAC_KEY_LEN);	18✔
83	if(input_len > 0)	18✔
84	hmac->update(&out_buf[CRYPTOBOX_HEADER_LEN], input_len);	17✔
85
86	// Can't write directly because of MAC truncation
87	secure_vector<uint8_t> mac = hmac->final();	18✔
88	copy_mem(&out_buf[VERSION_CODE_LEN + PBKDF_SALT_LEN], mac.data(), MAC_OUTPUT_LEN);	18✔
89
90	return PEM_Code::encode(out_buf, "BOTAN CRYPTOBOX MESSAGE");	18✔
91	}	126✔
92
93	secure_vector<uint8_t> decrypt_bin(const uint8_t input[], size_t input_len, std::string_view passphrase) {	36✔
94	DataSource_Memory input_src(input, input_len);	36✔
95	secure_vector<uint8_t> ciphertext = PEM_Code::decode_check_label(input_src, "BOTAN CRYPTOBOX MESSAGE");	54✔
96
97	if(ciphertext.size() < CRYPTOBOX_HEADER_LEN)	36✔
98	throw Decoding_Error("Invalid CryptoBox input");	×
99
100	for(size_t i = 0; i != VERSION_CODE_LEN; ++i) {	160✔
101	uint32_t version = load_be<uint32_t>(ciphertext.data(), 0);	129✔
102	if(version != CRYPTOBOX_VERSION_CODE)	129✔
103	throw Decoding_Error("Bad CryptoBox version");	5✔
104	}
105
106	const uint8_t* pbkdf_salt = &ciphertext[VERSION_CODE_LEN];	31✔
107	const uint8_t* box_mac = &ciphertext[VERSION_CODE_LEN + PBKDF_SALT_LEN];	31✔
108
109	auto pbkdf_fam = PasswordHashFamily::create_or_throw("PBKDF2(HMAC(SHA-512))");	49✔
110	auto pbkdf = pbkdf_fam->from_params(PBKDF_ITERATIONS);	31✔
111
112	secure_vector<uint8_t> master_key(CIPHER_KEY_LEN + MAC_KEY_LEN + CIPHER_IV_LEN);	44✔
113
114	pbkdf->derive_key(	31✔
115	master_key.data(), master_key.size(), passphrase.data(), passphrase.size(), pbkdf_salt, PBKDF_SALT_LEN);
116
117	const uint8_t* mk = master_key.data();	31✔
118	const uint8_t* cipher_key = mk;	31✔
119	const uint8_t* mac_key = mk + CIPHER_KEY_LEN;	31✔
120	const uint8_t* iv = mk + CIPHER_KEY_LEN + MAC_KEY_LEN;	31✔
121
122	// Now authenticate and decrypt
123	std::unique_ptr<MessageAuthenticationCode> hmac = MessageAuthenticationCode::create_or_throw("HMAC(SHA-512)");	44✔
124	hmac->set_key(mac_key, MAC_KEY_LEN);	31✔
125
126	if(ciphertext.size() > CRYPTOBOX_HEADER_LEN) {	31✔
127	hmac->update(&ciphertext[CRYPTOBOX_HEADER_LEN], ciphertext.size() - CRYPTOBOX_HEADER_LEN);	29✔
128	}
129	secure_vector<uint8_t> computed_mac = hmac->final();	31✔
130
131	if(!constant_time_compare(computed_mac.data(), box_mac, MAC_OUTPUT_LEN))	31✔
132	throw Decoding_Error("CryptoBox integrity failure");	13✔
133
134	auto ctr = Cipher_Mode::create_or_throw("Serpent/CTR-BE", Cipher_Dir::Decryption);	31✔
135	ctr->set_key(cipher_key, CIPHER_KEY_LEN);	18✔
136	ctr->start(iv, CIPHER_IV_LEN);	18✔
137	ctr->finish(ciphertext, CRYPTOBOX_HEADER_LEN);	18✔
138
139	ciphertext.erase(ciphertext.begin(), ciphertext.begin() + CRYPTOBOX_HEADER_LEN);	18✔
140	return ciphertext;	18✔
141	}	209✔
142
143	BOTAN_DIAGNOSTIC_PUSH
144	BOTAN_DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS
145
146	secure_vector<uint8_t> decrypt_bin(std::string_view input, std::string_view passphrase) {	18✔
147	return decrypt_bin(cast_char_ptr_to_uint8(input.data()), input.size(), passphrase);	18✔
148	}
149
150	std::string decrypt(const uint8_t input[], size_t input_len, std::string_view passphrase) {	18✔
151	const secure_vector<uint8_t> bin = decrypt_bin(input, input_len, passphrase);	18✔
152
153	return std::string(cast_uint8_ptr_to_char(&bin[0]), bin.size());	×
154	}	×
155
156	std::string decrypt(std::string_view input, std::string_view passphrase) {	18✔
157	return decrypt(cast_char_ptr_to_uint8(input.data()), input.size(), passphrase);	18✔
158	}
159
160	BOTAN_DIAGNOSTIC_POP
161
162	}

randombit / botan / 5079590438

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