GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/crypto/hash.cc
Date: 2026-04-05 02:35:23
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 66 bool HexPtr::IsValid() const {
37 66 const unsigned l = str->length();
38
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 66 if (l == 0)
39 3 return false;
40 63 const char *c = str->data(); // Walks through the string
41 63 unsigned i = 0; // String position of *c
42
43
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 2475 for (; i < l; ++i, ++c) {
44
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 2460 if (*c == '-')
45 42 break;
46
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 2418 if ((*c < '0') || (*c > 'f') || ((*c > '9') && (*c < 'a')))
47 6 return false;
48 }
49
50 // Walk through all algorithms
51
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 255 for (unsigned j = 0; j < kAny; ++j) {
52 210 const unsigned hex_length = 2 * kDigestSizes[j];
53 210 const unsigned algo_id_length = kAlgorithmIdSizes[j];
54
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 210 if (i == hex_length) {
55 // Right suffix?
56
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 195 for (; (i < l) && (i - hex_length < algo_id_length); ++i, ++c) {
57
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 159 if (*c != kAlgorithmIds[j][i - hex_length])
58 30 break;
59 }
60
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 66 if ((i == l) && (l == hex_length + algo_id_length))
61 12 return true;
62 54 i = hex_length;
63 54 c = str->data() + i;
64 }
65 }
66
67 45 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 72752 Any MkFromHexPtr(const HexPtr hex, const char suffix) {
83 72752 Any result;
84
85 72752 const unsigned length = hex.str->length();
86
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 72752 if (length == 2 * kDigestSizes[kMd5])
87 3 result = Any(kMd5, hex);
88
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 72752 if (length == 2 * kDigestSizes[kSha1])
89 72642 result = Any(kSha1, hex);
90 // TODO(jblomer) compare -rmd160, -shake128
91
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 72752 if ((length == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160]))
92 12 result = Any(kRmd160, hex);
93
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 72752 if ((length == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128]))
94 15 result = Any(kShake128, hex);
95
96 72752 result.suffix = suffix;
97 72752 return result;
98 }
99
100
101 /**
102 * Similar to MkFromHexPtr but the suffix is deducted from the HexPtr string.
103 */
104 22820 Any MkFromSuffixedHexPtr(const HexPtr hex) {
105 22820 Any result;
106
107 22820 const unsigned length = hex.str->length();
108
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 22820 if ((length == 2 * kDigestSizes[kMd5])
109
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 1322 || (length == 2 * kDigestSizes[kMd5] + 1)) {
110 21501 const Suffix suffix = (length == 2 * kDigestSizes[kMd5] + 1)
111
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 21501 ? *(hex.str->rbegin())
112 21501 : kSuffixNone;
113 21501 result = Any(kMd5, hex, suffix);
114 }
115
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 22820 if ((length == 2 * kDigestSizes[kSha1])
116
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 22113 || (length == 2 * kDigestSizes[kSha1] + 1)) {
117 1298 const Suffix suffix = (length == 2 * kDigestSizes[kSha1] + 1)
118
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 1298 ? *(hex.str->rbegin())
119 1298 : kSuffixNone;
120 1298 result = Any(kSha1, hex, suffix);
121 }
122
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 22820 if ((length == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160])
123 22817 || (length
124
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 22817 == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160] + 1)) {
125 const Suffix suffix = (length
126 12 == 2 * kDigestSizes[kRmd160]
127 12 + kAlgorithmIdSizes[kRmd160] + 1)
128
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 12 ? *(hex.str->rbegin())
129 12 : kSuffixNone;
130 12 result = Any(kRmd160, hex, suffix);
131 }
132
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 22820 if ((length == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128])
133 22817 || (length
134
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 22817 == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128] + 1)) {
135 const Suffix suffix = (length
136 6 == 2 * kDigestSizes[kShake128]
137 6 + kAlgorithmIdSizes[kShake128] + 1)
138
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 6 ? *(hex.str->rbegin())
139 6 : kSuffixNone;
140 6 result = Any(kShake128, hex, suffix);
141 }
142
143 22820 return result;
144 }
145
146
147 /**
148 * Allows the caller to create the context on the stack.
149 */
150 480419 unsigned GetContextSize(const Algorithms algorithm) {
151
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 480419 switch (algorithm) {
152 210083 case kMd5:
153 210083 return sizeof(MD5_CTX);
154 269803 case kSha1:
155 269803 return sizeof(SHA_CTX);
156 38 case kRmd160:
157 38 return sizeof(RIPEMD160_CTX);
158 513 case kShake128:
159 513 return sizeof(Keccak_HashInstance);
160 ✗ default:
161 ✗ PANIC(kLogDebug | kLogSyslogErr,
162 "tried to generate hash context for unspecified hash. Aborting...");
163 }
164 }
165
166 480556 void Init(ContextPtr context) {
167 HashReturn keccak_result;
168
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 480556 switch (context.algorithm) {
169 210086 case kMd5:
170
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 210086 assert(context.size == sizeof(MD5_CTX));
171 210086 MD5_Init(reinterpret_cast<MD5_CTX *>(context.buffer));
172 210086 break;
173 269922 case kSha1:
174
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 269922 assert(context.size == sizeof(SHA_CTX));
175 269922 SHA1_Init(reinterpret_cast<SHA_CTX *>(context.buffer));
176 269869 break;
177 38 case kRmd160:
178
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 38 assert(context.size == sizeof(RIPEMD160_CTX));
179 38 RIPEMD160_Init(reinterpret_cast<RIPEMD160_CTX *>(context.buffer));
180 38 break;
181 513 case kShake128:
182
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 513 assert(context.size == sizeof(Keccak_HashInstance));
183 513 keccak_result = Keccak_HashInitialize_SHAKE128(
184 reinterpret_cast<Keccak_HashInstance *>(context.buffer));
185
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 513 assert(keccak_result == SUCCESS);
186 513 break;
187 ✗ default:
188 ✗ PANIC(NULL); // Undefined hash
189 }
190 480506 }
191
192 280397614 void Update(const unsigned char *buffer, const unsigned buffer_length,
193 ContextPtr context) {
194 HashReturn keccak_result;
195
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 280397614 switch (context.algorithm) {
196 72315404 case kMd5:
197
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 72315404 assert(context.size == sizeof(MD5_CTX));
198 72315404 MD5_Update(reinterpret_cast<MD5_CTX *>(context.buffer), buffer,
199 buffer_length);
200 72315404 break;
201 69669635 case kSha1:
202
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 69669635 assert(context.size == sizeof(SHA_CTX));
203 69669635 SHA1_Update(reinterpret_cast<SHA_CTX *>(context.buffer), buffer,
204 buffer_length);
205 69670662 break;
206 69206060 case kRmd160:
207
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 69206060 assert(context.size == sizeof(RIPEMD160_CTX));
208 69206060 RIPEMD160_Update(reinterpret_cast<RIPEMD160_CTX *>(context.buffer),
209 buffer, buffer_length);
210 69206060 break;
211 69206522 case kShake128:
212
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 69206522 assert(context.size == sizeof(Keccak_HashInstance));
213 138413044 keccak_result = Keccak_HashUpdate(
214 69206522 reinterpret_cast<Keccak_HashInstance *>(context.buffer), buffer,
215 69206522 buffer_length * 8);
216
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 69206522 assert(keccak_result == SUCCESS);
217 69206522 break;
218 ✗ default:
219 ✗ PANIC(NULL); // Undefined hash
220 }
221 280398648 }
222
223 474122 void Final(ContextPtr context, Any *any_digest) {
224 HashReturn keccak_result;
225
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 474122 switch (context.algorithm) {
226 210082 case kMd5:
227
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 210082 assert(context.size == sizeof(MD5_CTX));
228 210082 MD5_Final(any_digest->digest,
229 210082 reinterpret_cast<MD5_CTX *>(context.buffer));
230 210082 break;
231 263518 case kSha1:
232
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 263518 assert(context.size == sizeof(SHA_CTX));
233 263518 SHA1_Final(any_digest->digest,
234 263518 reinterpret_cast<SHA_CTX *>(context.buffer));
235 265249 break;
236 38 case kRmd160:
237
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 38 assert(context.size == sizeof(RIPEMD160_CTX));
238 38 RIPEMD160_Final(any_digest->digest,
239 38 reinterpret_cast<RIPEMD160_CTX *>(context.buffer));
240 38 break;
241 513 case kShake128:
242
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 513 assert(context.size == sizeof(Keccak_HashInstance));
243 1026 keccak_result = Keccak_HashFinal(
244 513 reinterpret_cast<Keccak_HashInstance *>(context.buffer), NULL);
245
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 513 assert(keccak_result == SUCCESS);
246 1026 keccak_result = Keccak_HashSqueeze(
247 513 reinterpret_cast<Keccak_HashInstance *>(context.buffer),
248 513 any_digest->digest, kDigestSizes[kShake128] * 8);
249 513 break;
250 ✗ default:
251 ✗ PANIC(NULL); // Undefined hash
252 }
253 475882 any_digest->algorithm = context.algorithm;
254 475882 }
255
256
257 10074 void HashMem(const unsigned char *buffer, const unsigned buffer_size,
258 Any *any_digest) {
259 10074 const Algorithms algorithm = any_digest->algorithm;
260
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 10074 ContextPtr context(algorithm);
261 10074 context.buffer = alloca(context.size);
262
263
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 10074 Init(context);
264
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 10074 Update(buffer, buffer_size, context);
265
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 10074 Final(context, any_digest);
266 10074 }
267
268
269 633 void HashString(const std::string &content, Any *any_digest) {
270 633 HashMem(reinterpret_cast<const unsigned char *>(content.data()),
271 633 content.length(), any_digest);
272 633 }
273
274
275 103705 void Hmac(const string &key,
276 const unsigned char *buffer,
277 const unsigned buffer_size,
278 Any *any_digest) {
279 103705 const Algorithms algorithm = any_digest->algorithm;
280
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 103705 assert(algorithm != kAny);
281
282 103705 const unsigned block_size = kBlockSizes[algorithm];
283 103705 unsigned char key_block[block_size];
284 103705 memset(key_block, 0, block_size);
285
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 103705 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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 100039 if (key.length() > 0)
292 100030 memcpy(key_block, key.data(), key.length());
293 }
294
295 103705 unsigned char pad_block[block_size];
296 // Inner hash
297
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 103705 Any hash_inner(algorithm);
298
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 103705 ContextPtr context_inner(algorithm);
299 103705 context_inner.buffer = alloca(context_inner.size);
300
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 103705 Init(context_inner);
301
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 6740825 for (unsigned i = 0; i < block_size; ++i)
302 6637120 pad_block[i] = key_block[i] ^ 0x36;
303
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 103705 Update(pad_block, block_size, context_inner);
304
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 103705 Update(buffer, buffer_size, context_inner);
305
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 103705 Final(context_inner, &hash_inner);
306
307 // Outer hash
308
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 103705 ContextPtr context_outer(algorithm);
309 103705 context_outer.buffer = alloca(context_outer.size);
310
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 103705 Init(context_outer);
311
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 6740825 for (unsigned i = 0; i < block_size; ++i)
312 6637120 pad_block[i] = key_block[i] ^ 0x5c;
313
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 103705 Update(pad_block, block_size, context_outer);
314
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 103705 Update(hash_inner.digest, kDigestSizes[algorithm], context_outer);
315
316
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 103705 Final(context_outer, any_digest);
317 103705 }
318
319
320 6767 bool HashFd(int fd, Any *any_digest) {
321 6767 const Algorithms algorithm = any_digest->algorithm;
322
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 6767 ContextPtr context(algorithm);
323 6767 context.buffer = alloca(context.size);
324
325
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 6767 Init(context);
326 unsigned char io_buffer[4096];
327 int actual_bytes;
328
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 2764937 while ((actual_bytes = read(fd, io_buffer, 4096)) != 0) {
329
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 2758170 if (actual_bytes == -1) {
330 ✗ if (errno == EINTR)
331 ✗ continue;
332 ✗ return false;
333 }
334
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 2758170 Update(io_buffer, actual_bytes, context);
335 }
336
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 6767 Final(context, any_digest);
337 6767 return true;
338 }
339
340
341 6767 bool HashFile(const std::string &filename, Any *any_digest) {
342 6767 const int fd = open(filename.c_str(), O_RDONLY);
343
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 6767 if (fd == -1)
344 ✗ return false;
345
346 6767 const bool result = HashFd(fd, any_digest);
347 6767 close(fd);
348 6767 return result;
349 }
350
351
352 /**
353 * Fast constructor for hashing path names.
354 */
355 2792 Md5::Md5(const AsciiPtr ascii) {
356 2792 algorithm = kMd5;
357 2792 const string *str = ascii.str;
358
359 MD5_CTX md5_state;
360
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 2792 MD5_Init(&md5_state);
361
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 2792 MD5_Update(&md5_state, reinterpret_cast<const unsigned char *>(&(*str)[0]),
362 str->length());
363
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 2792 MD5_Final(digest, &md5_state);
364 2792 }
365
366
367 8863709 Md5::Md5(const char *chars, const unsigned length) {
368 8863709 algorithm = kMd5;
369
370 MD5_CTX md5_state;
371
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 8863709 MD5_Init(&md5_state);
372
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 8863709 MD5_Update(&md5_state, reinterpret_cast<const unsigned char *>(chars),
373 length);
374
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 8863709 MD5_Final(digest, &md5_state);
375 8863709 }
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 2597 void Md5::ToIntPair(uint64_t *lo, uint64_t *hi) const {
385 2597 memcpy(lo, digest, 8);
386 2597 memcpy(hi, digest + 8, 8);
387 2597 }
388
389
390 100026 Md5 Any::CastToMd5() {
391
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 100026 assert(algorithm == kMd5);
392 100026 Md5 result;
393 100026 memcpy(result.digest, digest, kDigestSizes[kMd5]);
394 100026 return result;
395 }
396
397 #ifndef OPENSSL_API_INTERFACE_V09
398 18 static string HexFromSha256(unsigned char digest[SHA256_DIGEST_LENGTH]) {
399 18 string result;
400
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 18 result.reserve(2 * SHA256_DIGEST_LENGTH);
401
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 594 for (unsigned i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
402 576 const char d1 = digest[i] / 16;
403 576 const char d2 = digest[i] % 16;
404
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 576 result.push_back(d1 + ((d1 <= 9) ? '0' : 'a' - 10));
405
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 576 result.push_back(d2 + ((d2 <= 9) ? '0' : 'a' - 10));
406 }
407 18 return result;
408 }
409 #endif
410
411 3 string Sha256File(const string &filename) {
412 #ifdef OPENSSL_API_INTERFACE_V09
413 PANIC(NULL);
414 #else
415
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 3 const int fd = open(filename.c_str(), O_RDONLY);
416
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 3 if (fd < 0)
417 ✗ return "";
418
419 SHA256_CTX ctx;
420
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 3 SHA256_Init(&ctx);
421
422 unsigned char io_buffer[4096];
423 int actual_bytes;
424
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 3 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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 3 close(fd);
434
435 unsigned char digest[SHA256_DIGEST_LENGTH];
436
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 3 SHA256_Final(digest, &ctx);
437
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 3 return HexFromSha256(digest);
438 #endif
439 }
440
441 6 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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 6 SHA256(buffer, buffer_size, digest);
447
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 12 return HexFromSha256(digest);
448 #endif
449 }
450
451 3 string Sha256String(const string &content) {
452 3 return Sha256Mem(reinterpret_cast<const unsigned char *>(content.data()),
453 3 content.length());
454 }
455
456
457 21 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 21 const unsigned block_size = 64;
465 21 const unsigned key_length = key.length();
466 unsigned char key_block[block_size];
467 21 memset(key_block, 0, block_size);
468
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 21 if (key_length > block_size) {
469
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 3 SHA256(reinterpret_cast<const unsigned char *>(key.data()), key_length,
470 key_block);
471 } else {
472
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 18 if (key.length() > 0)
473 18 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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 21 SHA256_Init(&ctx_inner);
481
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 1365 for (unsigned i = 0; i < block_size; ++i)
482 1344 pad_block[i] = key_block[i] ^ 0x36;
483
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 21 SHA256_Update(&ctx_inner, pad_block, block_size);
484
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 21 SHA256_Update(&ctx_inner, content.data(), content.length());
485
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 21 SHA256_Final(digest_inner, &ctx_inner);
486
487 // Outer hash
488 SHA256_CTX ctx_outer;
489
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490
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491 1344 pad_block[i] = key_block[i] ^ 0x5c;
492
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 21 SHA256_Update(&ctx_outer, pad_block, block_size);
493
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 21 SHA256_Update(&ctx_outer, digest_inner, SHA256_DIGEST_LENGTH);
494
495
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 21 SHA256_Final(digest, &ctx_outer);
496
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 21 if (raw_output)
497
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 12 return string(reinterpret_cast<const char *>(digest), SHA256_DIGEST_LENGTH);
498
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 9 return HexFromSha256(digest);
499 #endif
500 }
501
502 } // namespace shash
503
504 #ifdef CVMFS_NAMESPACE_GUARD
505 } // namespace CVMFS_NAMESPACE_GUARD
506 #endif
507