GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/crypto/hash.cc
Date: 2025-07-13 02:35:07
Exec Total Coverage
Lines: 275 306 89.9%
Branches: 169 268 63.1%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5
6 #include "crypto/hash.h"
7
8 #include <alloca.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <openssl/hmac.h>
12 #include <openssl/md5.h>
13 #include <openssl/ripemd.h>
14 #include <openssl/sha.h>
15 #include <unistd.h>
16
17 #include <cstdio>
18 #include <cstring>
19
20 #include "KeccakHash.h"
21 #include "crypto/openssl_version.h"
22 #include "util/exception.h"
23
24
25 using namespace std; // NOLINT
26
27 #ifdef CVMFS_NAMESPACE_GUARD
28 namespace CVMFS_NAMESPACE_GUARD {
29 #endif
30
31 namespace shash {
32
33 const char *kAlgorithmIds[] = {"", "", "-rmd160", "-shake128", ""};
34
35
36 132 bool HexPtr::IsValid() const {
37 132 const unsigned l = str->length();
38
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 132 if (l == 0)
39 6 return false;
40 126 const char *c = str->data(); // Walks through the string
41 126 unsigned i = 0; // String position of *c
42
43
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 4950 for (; i < l; ++i, ++c) {
44
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 4920 if (*c == '-')
45 84 break;
46
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 4836 if ((*c < '0') || (*c > 'f') || ((*c > '9') && (*c < 'a')))
47 12 return false;
48 }
49
50 // Walk through all algorithms
51
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 510 for (unsigned j = 0; j < kAny; ++j) {
52 420 const unsigned hex_length = 2 * kDigestSizes[j];
53 420 const unsigned algo_id_length = kAlgorithmIdSizes[j];
54
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 420 if (i == hex_length) {
55 // Right suffix?
56
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 390 for (; (i < l) && (i - hex_length < algo_id_length); ++i, ++c) {
57
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 318 if (*c != kAlgorithmIds[j][i - hex_length])
58 60 break;
59 }
60
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 132 if ((i == l) && (l == hex_length + algo_id_length))
61 24 return true;
62 108 i = hex_length;
63 108 c = str->data() + i;
64 }
65 }
66
67 90 return false;
68 }
69
70
71 ✗ Algorithms ParseHashAlgorithm(const string &algorithm_option) {
72 ✗ if (algorithm_option == "sha1")
73 ✗ return kSha1;
74 ✗ if (algorithm_option == "rmd160")
75 ✗ return kRmd160;
76 ✗ if (algorithm_option == "shake128")
77 ✗ return kShake128;
78 ✗ return kAny;
79 }
80
81
82 167999 Any MkFromHexPtr(const HexPtr hex, const char suffix) {
83 167999 Any result;
84
85 167999 const unsigned length = hex.str->length();
86
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 167999 if (length == 2 * kDigestSizes[kMd5])
87 6 result = Any(kMd5, hex);
88
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 167999 if (length == 2 * kDigestSizes[kSha1])
89 167899 result = Any(kSha1, hex);
90 // TODO(jblomer) compare -rmd160, -shake128
91
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 167999 if ((length == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160]))
92 9 result = Any(kRmd160, hex);
93
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 167999 if ((length == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128]))
94 18 result = Any(kShake128, hex);
95
96 167999 result.suffix = suffix;
97 167999 return result;
98 }
99
100
101 /**
102 * Similar to MkFromHexPtr but the suffix is deducted from the HexPtr string.
103 */
104 20010 Any MkFromSuffixedHexPtr(const HexPtr hex) {
105 20010 Any result;
106
107 20010 const unsigned length = hex.str->length();
108
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 20010 if ((length == 2 * kDigestSizes[kMd5])
109
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 1713 || (length == 2 * kDigestSizes[kMd5] + 1)) {
110 18303 const Suffix suffix = (length == 2 * kDigestSizes[kMd5] + 1)
111
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 18303 ? *(hex.str->rbegin())
112 18303 : kSuffixNone;
113 18303 result = Any(kMd5, hex, suffix);
114 }
115
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 20010 if ((length == 2 * kDigestSizes[kSha1])
116
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 19101 || (length == 2 * kDigestSizes[kSha1] + 1)) {
117 1671 const Suffix suffix = (length == 2 * kDigestSizes[kSha1] + 1)
118
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 1671 ? *(hex.str->rbegin())
119 1671 : kSuffixNone;
120 1671 result = Any(kSha1, hex, suffix);
121 }
122
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 20010 if ((length == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160])
123 20004 || (length
124
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 20004 == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160] + 1)) {
125 const Suffix suffix = (length
126 18 == 2 * kDigestSizes[kRmd160]
127 18 + kAlgorithmIdSizes[kRmd160] + 1)
128
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 18 ? *(hex.str->rbegin())
129 18 : kSuffixNone;
130 18 result = Any(kRmd160, hex, suffix);
131 }
132
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 20010 if ((length == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128])
133 20004 || (length
134
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 20004 == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128] + 1)) {
135 const Suffix suffix = (length
136 12 == 2 * kDigestSizes[kShake128]
137 12 + kAlgorithmIdSizes[kShake128] + 1)
138
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 12 ? *(hex.str->rbegin())
139 12 : kSuffixNone;
140 12 result = Any(kShake128, hex, suffix);
141 }
142
143 20010 return result;
144 }
145
146
147 /**
148 * Allows the caller to create the context on the stack.
149 */
150 1392079 unsigned GetContextSize(const Algorithms algorithm) {
151
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 1392079 switch (algorithm) {
152 610095 case kMd5:
153 610095 return sizeof(MD5_CTX);
154 781367 case kSha1:
155 781367 return sizeof(SHA_CTX);
156 74 case kRmd160:
157 74 return sizeof(RIPEMD160_CTX);
158 561 case kShake128:
159 561 return sizeof(Keccak_HashInstance);
160 ✗ default:
161 ✗ PANIC(kLogDebug | kLogSyslogErr,
162 "tried to generate hash context for unspecified hash. Aborting...");
163 }
164 }
165
166 1392121 void Init(ContextPtr context) {
167 HashReturn keccak_result;
168
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 1392121 switch (context.algorithm) {
169 610113 case kMd5:
170
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 610113 assert(context.size == sizeof(MD5_CTX));
171 610113 MD5_Init(reinterpret_cast<MD5_CTX *>(context.buffer));
172 610113 break;
173 781373 case kSha1:
174
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 781373 assert(context.size == sizeof(SHA_CTX));
175 781373 SHA1_Init(reinterpret_cast<SHA_CTX *>(context.buffer));
176 781187 break;
177 74 case kRmd160:
178
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 74 assert(context.size == sizeof(RIPEMD160_CTX));
179 74 RIPEMD160_Init(reinterpret_cast<RIPEMD160_CTX *>(context.buffer));
180 74 break;
181 561 case kShake128:
182
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 561 assert(context.size == sizeof(Keccak_HashInstance));
183 561 keccak_result = Keccak_HashInitialize_SHAKE128(
184 reinterpret_cast<Keccak_HashInstance *>(context.buffer));
185
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 561 assert(keccak_result == SUCCESS);
186 561 break;
187 ✗ default:
188 ✗ PANIC(NULL); // Undefined hash
189 }
190 1391935 }
191
192 559058580 void Update(const unsigned char *buffer, const unsigned buffer_length,
193 ContextPtr context) {
194 HashReturn keccak_result;
195
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 559058580 switch (context.algorithm) {
196 142321446 case kMd5:
197
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 142321446 assert(context.size == sizeof(MD5_CTX));
198 142321446 MD5_Update(reinterpret_cast<MD5_CTX *>(context.buffer), buffer,
199 buffer_length);
200 142321446 break;
201 139912507 case kSha1:
202
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 139912507 assert(context.size == sizeof(SHA_CTX));
203 139912507 SHA1_Update(reinterpret_cast<SHA_CTX *>(context.buffer), buffer,
204 buffer_length);
205 139916005 break;
206 138412118 case kRmd160:
207
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 138412118 assert(context.size == sizeof(RIPEMD160_CTX));
208 138412118 RIPEMD160_Update(reinterpret_cast<RIPEMD160_CTX *>(context.buffer),
209 buffer, buffer_length);
210 138412118 break;
211 138412578 case kShake128:
212
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 138412578 assert(context.size == sizeof(Keccak_HashInstance));
213 276825156 keccak_result = Keccak_HashUpdate(
214 138412578 reinterpret_cast<Keccak_HashInstance *>(context.buffer), buffer,
215 138412578 buffer_length * 8);
216
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 138412578 assert(keccak_result == SUCCESS);
217 138412578 break;
218 ✗ default:
219 ✗ PANIC(NULL); // Undefined hash
220 }
221 559062147 }
222
223 1373110 void Final(ContextPtr context, Any *any_digest) {
224 HashReturn keccak_result;
225
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 1373110 switch (context.algorithm) {
226 610089 case kMd5:
227
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 610089 assert(context.size == sizeof(MD5_CTX));
228 610089 MD5_Final(any_digest->digest,
229 610089 reinterpret_cast<MD5_CTX *>(context.buffer));
230 610089 break;
231 762452 case kSha1:
232
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 762452 assert(context.size == sizeof(SHA_CTX));
233 762452 SHA1_Final(any_digest->digest,
234 762452 reinterpret_cast<SHA_CTX *>(context.buffer));
235 767552 break;
236 74 case kRmd160:
237
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 74 assert(context.size == sizeof(RIPEMD160_CTX));
238 74 RIPEMD160_Final(any_digest->digest,
239 74 reinterpret_cast<RIPEMD160_CTX *>(context.buffer));
240 74 break;
241 561 case kShake128:
242
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 561 assert(context.size == sizeof(Keccak_HashInstance));
243 1122 keccak_result = Keccak_HashFinal(
244 561 reinterpret_cast<Keccak_HashInstance *>(context.buffer), NULL);
245
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 561 assert(keccak_result == SUCCESS);
246 1122 keccak_result = Keccak_HashSqueeze(
247 561 reinterpret_cast<Keccak_HashInstance *>(context.buffer),
248 561 any_digest->digest, kDigestSizes[kShake128] * 8);
249 561 break;
250 ✗ default:
251 ✗ PANIC(NULL); // Undefined hash
252 }
253 1378276 any_digest->algorithm = context.algorithm;
254 1378276 }
255
256
257 11082 void HashMem(const unsigned char *buffer, const unsigned buffer_size,
258 Any *any_digest) {
259 11082 const Algorithms algorithm = any_digest->algorithm;
260
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 11082 ContextPtr context(algorithm);
261 11082 context.buffer = alloca(context.size);
262
263
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 11082 Init(context);
264
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 11082 Update(buffer, buffer_size, context);
265
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 11082 Final(context, any_digest);
266 11082 }
267
268
269 735 void HashString(const std::string &content, Any *any_digest) {
270 735 HashMem(reinterpret_cast<const unsigned char *>(content.data()),
271 735 content.length(), any_digest);
272 735 }
273
274
275 303750 void Hmac(const string &key,
276 const unsigned char *buffer,
277 const unsigned buffer_size,
278 Any *any_digest) {
279 303750 const Algorithms algorithm = any_digest->algorithm;
280
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 303750 assert(algorithm != kAny);
281
282 303750 const unsigned block_size = kBlockSizes[algorithm];
283 303750 unsigned char key_block[block_size];
284 303750 memset(key_block, 0, block_size);
285
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 303750 if (key.length() > block_size) {
286
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 3666 Any hash_key(algorithm);
287
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 3666 HashMem(reinterpret_cast<const unsigned char *>(key.data()), key.length(),
288 &hash_key);
289 3666 memcpy(key_block, hash_key.digest, kDigestSizes[algorithm]);
290 } else {
291
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 300084 if (key.length() > 0)
292 300066 memcpy(key_block, key.data(), key.length());
293 }
294
295 303750 unsigned char pad_block[block_size];
296 // Inner hash
297
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 303750 Any hash_inner(algorithm);
298
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 303750 ContextPtr context_inner(algorithm);
299 303750 context_inner.buffer = alloca(context_inner.size);
300
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 303750 Init(context_inner);
301
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 19743750 for (unsigned i = 0; i < block_size; ++i)
302 19440000 pad_block[i] = key_block[i] ^ 0x36;
303
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 303750 Update(pad_block, block_size, context_inner);
304
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 303750 Update(buffer, buffer_size, context_inner);
305
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 303750 Final(context_inner, &hash_inner);
306
307 // Outer hash
308
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 303750 ContextPtr context_outer(algorithm);
309 303750 context_outer.buffer = alloca(context_outer.size);
310
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 303750 Init(context_outer);
311
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 19743750 for (unsigned i = 0; i < block_size; ++i)
312 19440000 pad_block[i] = key_block[i] ^ 0x5c;
313
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 303750 Update(pad_block, block_size, context_outer);
314
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 303750 Update(hash_inner.digest, kDigestSizes[algorithm], context_outer);
315
316
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 303750 Final(context_outer, any_digest);
317 303750 }
318
319
320 6823 bool HashFd(int fd, Any *any_digest) {
321 6823 const Algorithms algorithm = any_digest->algorithm;
322
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 6823 ContextPtr context(algorithm);
323 6823 context.buffer = alloca(context.size);
324
325
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 6823 Init(context);
326 unsigned char io_buffer[4096];
327 int actual_bytes;
328
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 3031415 while ((actual_bytes = read(fd, io_buffer, 4096)) != 0) {
329
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 3024592 if (actual_bytes == -1) {
330 ✗ if (errno == EINTR)
331 ✗ continue;
332 ✗ return false;
333 }
334
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 3024592 Update(io_buffer, actual_bytes, context);
335 }
336
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 6823 Final(context, any_digest);
337 6823 return true;
338 }
339
340
341 6823 bool HashFile(const std::string &filename, Any *any_digest) {
342 6823 const int fd = open(filename.c_str(), O_RDONLY);
343
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 6823 if (fd == -1)
344 ✗ return false;
345
346 6823 const bool result = HashFd(fd, any_digest);
347 6823 close(fd);
348 6823 return result;
349 }
350
351
352 /**
353 * Fast constructor for hashing path names.
354 */
355 8592 Md5::Md5(const AsciiPtr ascii) {
356 8592 algorithm = kMd5;
357 8592 const string *str = ascii.str;
358
359 MD5_CTX md5_state;
360
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 8592 MD5_Init(&md5_state);
361
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 8592 MD5_Update(&md5_state, reinterpret_cast<const unsigned char *>(&(*str)[0]),
362 str->length());
363
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 8592 MD5_Final(digest, &md5_state);
364 8592 }
365
366
367 8903354 Md5::Md5(const char *chars, const unsigned length) {
368 8903354 algorithm = kMd5;
369
370 MD5_CTX md5_state;
371
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 8903354 MD5_Init(&md5_state);
372
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 8903354 MD5_Update(&md5_state, reinterpret_cast<const unsigned char *>(chars),
373 length);
374
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 8903354 MD5_Final(digest, &md5_state);
375 8903354 }
376
377
378 ✗ Md5::Md5(const uint64_t lo, const uint64_t hi) {
379 ✗ algorithm = kMd5;
380 ✗ memcpy(digest, &lo, 8);
381 ✗ memcpy(digest + 8, &hi, 8);
382 }
383
384 11375 void Md5::ToIntPair(uint64_t *lo, uint64_t *hi) const {
385 11375 memcpy(lo, digest, 8);
386 11375 memcpy(hi, digest + 8, 8);
387 11375 }
388
389
390 300070 Md5 Any::CastToMd5() {
391
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 300070 assert(algorithm == kMd5);
392 300070 Md5 result;
393 300070 memcpy(result.digest, digest, kDigestSizes[kMd5]);
394 300070 return result;
395 }
396
397 #ifndef OPENSSL_API_INTERFACE_V09
398 36 static string HexFromSha256(unsigned char digest[SHA256_DIGEST_LENGTH]) {
399 36 string result;
400
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 36 result.reserve(2 * SHA256_DIGEST_LENGTH);
401
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 1188 for (unsigned i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
402 1152 const char d1 = digest[i] / 16;
403 1152 const char d2 = digest[i] % 16;
404
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 1152 result.push_back(d1 + ((d1 <= 9) ? '0' : 'a' - 10));
405
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 1152 result.push_back(d2 + ((d2 <= 9) ? '0' : 'a' - 10));
406 }
407 36 return result;
408 }
409 #endif
410
411 6 string Sha256File(const string &filename) {
412 #ifdef OPENSSL_API_INTERFACE_V09
413 PANIC(NULL);
414 #else
415
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 6 const int fd = open(filename.c_str(), O_RDONLY);
416
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 6 if (fd < 0)
417 ✗ return "";
418
419 SHA256_CTX ctx;
420
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 6 SHA256_Init(&ctx);
421
422 unsigned char io_buffer[4096];
423 int actual_bytes;
424
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 6 while ((actual_bytes = read(fd, io_buffer, 4096)) != 0) {
425 ✗ if (actual_bytes == -1) {
426 ✗ if (errno == EINTR)
427 ✗ continue;
428 ✗ close(fd);
429 ✗ return "";
430 }
431 ✗ SHA256_Update(&ctx, io_buffer, actual_bytes);
432 }
433
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 6 close(fd);
434
435 unsigned char digest[SHA256_DIGEST_LENGTH];
436
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 6 SHA256_Final(digest, &ctx);
437
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 6 return HexFromSha256(digest);
438 #endif
439 }
440
441 12 string Sha256Mem(const unsigned char *buffer, const unsigned buffer_size) {
442 #ifdef OPENSSL_API_INTERFACE_V09
443 PANIC(NULL);
444 #else
445 unsigned char digest[SHA256_DIGEST_LENGTH];
446
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 12 SHA256(buffer, buffer_size, digest);
447
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 24 return HexFromSha256(digest);
448 #endif
449 }
450
451 6 string Sha256String(const string &content) {
452 6 return Sha256Mem(reinterpret_cast<const unsigned char *>(content.data()),
453 6 content.length());
454 }
455
456
457 42 std::string Hmac256(const std::string &key,
458 const std::string &content,
459 bool raw_output) {
460 #ifdef OPENSSL_API_INTERFACE_V09
461 PANIC(NULL);
462 #else
463 unsigned char digest[SHA256_DIGEST_LENGTH];
464 42 const unsigned block_size = 64;
465 42 const unsigned key_length = key.length();
466 unsigned char key_block[block_size];
467 42 memset(key_block, 0, block_size);
468
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 42 if (key_length > block_size) {
469
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 6 SHA256(reinterpret_cast<const unsigned char *>(key.data()), key_length,
470 key_block);
471 } else {
472
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 36 if (key.length() > 0)
473 36 memcpy(key_block, key.data(), key_length);
474 }
475
476 unsigned char pad_block[block_size];
477 // Inner hash
478 SHA256_CTX ctx_inner;
479 unsigned char digest_inner[SHA256_DIGEST_LENGTH];
480
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 42 SHA256_Init(&ctx_inner);
481
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482 2688 pad_block[i] = key_block[i] ^ 0x36;
483
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 42 SHA256_Update(&ctx_inner, pad_block, block_size);
484
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 42 SHA256_Update(&ctx_inner, content.data(), content.length());
485
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 42 SHA256_Final(digest_inner, &ctx_inner);
486
487 // Outer hash
488 SHA256_CTX ctx_outer;
489
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 42 SHA256_Init(&ctx_outer);
490
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491 2688 pad_block[i] = key_block[i] ^ 0x5c;
492
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 42 SHA256_Update(&ctx_outer, pad_block, block_size);
493
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 42 SHA256_Update(&ctx_outer, digest_inner, SHA256_DIGEST_LENGTH);
494
495
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 42 SHA256_Final(digest, &ctx_outer);
496
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 42 if (raw_output)
497
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 24 return string(reinterpret_cast<const char *>(digest), SHA256_DIGEST_LENGTH);
498
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 18 return HexFromSha256(digest);
499 #endif
500 }
501
502 } // namespace shash
503
504 #ifdef CVMFS_NAMESPACE_GUARD
505 } // namespace CVMFS_NAMESPACE_GUARD
506 #endif
507