This file is indexed.

/usr/include/apr-1.0/apr_crypto.h is in libaprutil1-dev 1.5.4-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_CRYPTO_H
#define APR_CRYPTO_H

#include "apu.h"
#include "apr_pools.h"
#include "apr_tables.h"
#include "apr_hash.h"
#include "apu_errno.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file apr_crypto.h
 * @brief APR-UTIL Crypto library
 */
/**
 * @defgroup APR_Util_Crypto Crypto routines
 * @ingroup APR_Util
 * @{
 */

#if APU_HAVE_CRYPTO

#ifndef APU_CRYPTO_RECOMMENDED_DRIVER
#if APU_HAVE_OPENSSL
#define APU_CRYPTO_RECOMMENDED_DRIVER "openssl"
#else
#if APU_HAVE_NSS
#define APU_CRYPTO_RECOMMENDED_DRIVER "nss"
#else
#if APU_HAVE_MSCNG
#define APU_CRYPTO_RECOMMENDED_DRIVER "mscng"
#else
#if APU_HAVE_MSCAPI
#define APU_CRYPTO_RECOMMENDED_DRIVER "mscapi"
#else
#endif
#endif
#endif
#endif
#endif

/**
 * Symmetric Key types understood by the library.
 *
 * NOTE: It is expected that this list will grow over time.
 *
 * Interoperability Matrix:
 *
 * The matrix is based on the testcrypto.c unit test, which attempts to
 * test whether a simple encrypt/decrypt will succeed, as well as testing
 * whether an encrypted string by one library can be decrypted by the
 * others.
 *
 * Some libraries will successfully encrypt and decrypt their own data,
 * but won't decrypt data from another library. It is hoped that over
 * time these anomalies will be found and fixed, but until then it is
 * recommended that ciphers are chosen that interoperate across platform.
 *
 * An X below means the test passes, it does not necessarily mean that
 * encryption performed is correct or secure. Applications should stick
 * to ciphers that pass the interoperablity tests on the right hand side
 * of the table.
 *
 * Aligned data is data whose length is a multiple of the block size for
 * the chosen cipher. Padded data is data that is not aligned by block
 * size and must be padded by the crypto library.
 *
 *                  OpenSSL      NSS      Interop
 *                 Align Pad  Align Pad  Align Pad
 * 3DES_192/CBC    X     X    X     X    X     X
 * 3DES_192/ECB    X     X
 * AES_256/CBC     X     X    X     X    X     X
 * AES_256/ECB     X     X    X          X
 * AES_192/CBC     X     X    X     X
 * AES_192/ECB     X     X    X
 * AES_128/CBC     X     X    X     X
 * AES_128/ECB     X     X    X
 *
 * Conclusion: for padded data, use 3DES_192/CBC or AES_256/CBC. For
 * aligned data, use 3DES_192/CBC, AES_256/CBC or AES_256/ECB.
 */

typedef enum
{
    APR_KEY_NONE, APR_KEY_3DES_192, /** 192 bit (3-Key) 3DES */
    APR_KEY_AES_128, /** 128 bit AES */
    APR_KEY_AES_192, /** 192 bit AES */
    APR_KEY_AES_256
/** 256 bit AES */
} apr_crypto_block_key_type_e;

typedef enum
{
    APR_MODE_NONE, /** An error condition */
    APR_MODE_ECB, /** Electronic Code Book */
    APR_MODE_CBC
/** Cipher Block Chaining */
} apr_crypto_block_key_mode_e;

/* These are opaque structs.  Instantiation is up to each backend */
typedef struct apr_crypto_driver_t apr_crypto_driver_t;
typedef struct apr_crypto_t apr_crypto_t;
typedef struct apr_crypto_config_t apr_crypto_config_t;
typedef struct apr_crypto_key_t apr_crypto_key_t;
typedef struct apr_crypto_block_t apr_crypto_block_t;

/**
 * @brief Perform once-only initialisation. Call once only.
 *
 * @param pool - pool to register any shutdown cleanups, etc
 * @return APR_NOTIMPL in case of no crypto support.
 */
APU_DECLARE(apr_status_t) apr_crypto_init(apr_pool_t *pool);

/**
 * @brief Register a cleanup to zero out the buffer provided
 * when the pool is cleaned up.
 *
 * @param pool - pool to register the cleanup
 * @param buffer - buffer to zero out
 * @param size - size of the buffer to zero out
 */
APU_DECLARE(apr_status_t) apr_crypto_clear(apr_pool_t *pool, void *buffer,
        apr_size_t size);

/**
 * @brief Get the driver struct for a name
 *
 * @param driver - pointer to driver struct.
 * @param name - driver name
 * @param params - array of initialisation parameters
 * @param result - result and error message on failure
 * @param pool - (process) pool to register cleanup
 * @return APR_SUCCESS for success
 * @return APR_ENOTIMPL for no driver (when DSO not enabled)
 * @return APR_EDSOOPEN if DSO driver file can't be opened
 * @return APR_ESYMNOTFOUND if the driver file doesn't contain a driver
 * @remarks NSS: the params can have "dir", "key3", "cert7" and "secmod"
 *  keys, each followed by an equal sign and a value. Such key/value pairs can
 *  be delimited by space or tab. If the value contains a space, surround the
 *  whole key value pair in quotes: "dir=My Directory".
 * @remarks OpenSSL: currently no params are supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_get_driver(
        const apr_crypto_driver_t **driver,
        const char *name, const char *params, const apu_err_t **result,
        apr_pool_t *pool);

/**
 * @brief Return the name of the driver.
 *
 * @param driver - The driver in use.
 * @return The name of the driver.
 */
APU_DECLARE(const char *) apr_crypto_driver_name(
        const apr_crypto_driver_t *driver);

/**
 * @brief Get the result of the last operation on a context. If the result
 *        is NULL, the operation was successful.
 * @param result - the result structure
 * @param f - context pointer
 * @return APR_SUCCESS for success
 */
APU_DECLARE(apr_status_t) apr_crypto_error(const apu_err_t **result,
        const apr_crypto_t *f);

/**
 * @brief Create a context for supporting encryption. Keys, certificates,
 *        algorithms and other parameters will be set per context. More than
 *        one context can be created at one time. A cleanup will be automatically
 *        registered with the given pool to guarantee a graceful shutdown.
 * @param f - context pointer will be written here
 * @param driver - driver to use
 * @param params - array of key parameters
 * @param pool - process pool
 * @return APR_ENOENGINE when the engine specified does not exist. APR_EINITENGINE
 * if the engine cannot be initialised.
 * @remarks NSS: currently no params are supported.
 * @remarks OpenSSL: the params can have "engine" as a key, followed by an equal
 *  sign and a value.
 */
APU_DECLARE(apr_status_t) apr_crypto_make(apr_crypto_t **f,
        const apr_crypto_driver_t *driver, const char *params,
        apr_pool_t *pool);

/**
 * @brief Get a hash table of key types, keyed by the name of the type against
 * an integer pointer constant.
 *
 * @param types - hashtable of key types keyed to constants.
 * @param f - encryption context
 * @return APR_SUCCESS for success
 */
APU_DECLARE(apr_status_t) apr_crypto_get_block_key_types(apr_hash_t **types,
        const apr_crypto_t *f);

/**
 * @brief Get a hash table of key modes, keyed by the name of the mode against
 * an integer pointer constant.
 *
 * @param modes - hashtable of key modes keyed to constants.
 * @param f - encryption context
 * @return APR_SUCCESS for success
 */
APU_DECLARE(apr_status_t) apr_crypto_get_block_key_modes(apr_hash_t **modes,
        const apr_crypto_t *f);

/**
 * @brief Create a key from the given passphrase. By default, the PBKDF2
 *        algorithm is used to generate the key from the passphrase. It is expected
 *        that the same pass phrase will generate the same key, regardless of the
 *        backend crypto platform used. The key is cleaned up when the context
 *        is cleaned, and may be reused with multiple encryption or decryption
 *        operations.
 * @note If *key is NULL, a apr_crypto_key_t will be created from a pool. If
 *       *key is not NULL, *key must point at a previously created structure.
 * @param key The key returned, see note.
 * @param ivSize The size of the initialisation vector will be returned, based
 *               on whether an IV is relevant for this type of crypto.
 * @param pass The passphrase to use.
 * @param passLen The passphrase length in bytes
 * @param salt The salt to use.
 * @param saltLen The salt length in bytes
 * @param type 3DES_192, AES_128, AES_192, AES_256.
 * @param mode Electronic Code Book / Cipher Block Chaining.
 * @param doPad Pad if necessary.
 * @param iterations Number of iterations to use in algorithm
 * @param f The context to use.
 * @param p The pool to use.
 * @return Returns APR_ENOKEY if the pass phrase is missing or empty, or if a backend
 *         error occurred while generating the key. APR_ENOCIPHER if the type or mode
 *         is not supported by the particular backend. APR_EKEYTYPE if the key type is
 *         not known. APR_EPADDING if padding was requested but is not supported.
 *         APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_passphrase(apr_crypto_key_t **key,
        apr_size_t *ivSize, const char *pass, apr_size_t passLen,
        const unsigned char * salt, apr_size_t saltLen,
        const apr_crypto_block_key_type_e type,
        const apr_crypto_block_key_mode_e mode, const int doPad,
        const int iterations, const apr_crypto_t *f, apr_pool_t *p);

/**
 * @brief Initialise a context for encrypting arbitrary data using the given key.
 * @note If *ctx is NULL, a apr_crypto_block_t will be created from a pool. If
 *       *ctx is not NULL, *ctx must point at a previously created structure.
 * @param ctx The block context returned, see note.
 * @param iv Optional initialisation vector. If the buffer pointed to is NULL,
 *           an IV will be created at random, in space allocated from the pool.
 *           If the buffer pointed to is not NULL, the IV in the buffer will be
 *           used.
 * @param key The key structure to use.
 * @param blockSize The block size of the cipher.
 * @param p The pool to use.
 * @return Returns APR_ENOIV if an initialisation vector is required but not specified.
 *         Returns APR_EINIT if the backend failed to initialise the context. Returns
 *         APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_init(
        apr_crypto_block_t **ctx, const unsigned char **iv,
        const apr_crypto_key_t *key, apr_size_t *blockSize, apr_pool_t *p);

/**
 * @brief Encrypt data provided by in, write it to out.
 * @note The number of bytes written will be written to outlen. If
 *       out is NULL, outlen will contain the maximum size of the
 *       buffer needed to hold the data, including any data
 *       generated by apr_crypto_block_encrypt_finish below. If *out points
 *       to NULL, a buffer sufficiently large will be created from
 *       the pool provided. If *out points to a not-NULL value, this
 *       value will be used as a buffer instead.
 * @param out Address of a buffer to which data will be written,
 *        see note.
 * @param outlen Length of the output will be written here.
 * @param in Address of the buffer to read.
 * @param inlen Length of the buffer to read.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if
 *         not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_encrypt(unsigned char **out,
        apr_size_t *outlen, const unsigned char *in, apr_size_t inlen,
        apr_crypto_block_t *ctx);

/**
 * @brief Encrypt final data block, write it to out.
 * @note If necessary the final block will be written out after being
 *       padded. Typically the final block will be written to the
 *       same buffer used by apr_crypto_block_encrypt, offset by the
 *       number of bytes returned as actually written by the
 *       apr_crypto_block_encrypt() call. After this call, the context
 *       is cleaned and can be reused by apr_crypto_block_encrypt_init().
 * @param out Address of a buffer to which data will be written. This
 *            buffer must already exist, and is usually the same
 *            buffer used by apr_evp_crypt(). See note.
 * @param outlen Length of the output will be written here.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred.
 * @return APR_EPADDING if padding was enabled and the block was incorrectly
 *         formatted.
 * @return APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_finish(unsigned char *out,
        apr_size_t *outlen, apr_crypto_block_t *ctx);

/**
 * @brief Initialise a context for decrypting arbitrary data using the given key.
 * @note If *ctx is NULL, a apr_crypto_block_t will be created from a pool. If
 *       *ctx is not NULL, *ctx must point at a previously created structure.
 * @param ctx The block context returned, see note.
 * @param blockSize The block size of the cipher.
 * @param iv Optional initialisation vector.
 * @param key The key structure to use.
 * @param p The pool to use.
 * @return Returns APR_ENOIV if an initialisation vector is required but not specified.
 *         Returns APR_EINIT if the backend failed to initialise the context. Returns
 *         APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_init(
        apr_crypto_block_t **ctx, apr_size_t *blockSize,
        const unsigned char *iv, const apr_crypto_key_t *key, apr_pool_t *p);

/**
 * @brief Decrypt data provided by in, write it to out.
 * @note The number of bytes written will be written to outlen. If
 *       out is NULL, outlen will contain the maximum size of the
 *       buffer needed to hold the data, including any data
 *       generated by apr_crypto_block_decrypt_finish below. If *out points
 *       to NULL, a buffer sufficiently large will be created from
 *       the pool provided. If *out points to a not-NULL value, this
 *       value will be used as a buffer instead.
 * @param out Address of a buffer to which data will be written,
 *        see note.
 * @param outlen Length of the output will be written here.
 * @param in Address of the buffer to read.
 * @param inlen Length of the buffer to read.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if
 *         not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_decrypt(unsigned char **out,
        apr_size_t *outlen, const unsigned char *in, apr_size_t inlen,
        apr_crypto_block_t *ctx);

/**
 * @brief Decrypt final data block, write it to out.
 * @note If necessary the final block will be written out after being
 *       padded. Typically the final block will be written to the
 *       same buffer used by apr_crypto_block_decrypt, offset by the
 *       number of bytes returned as actually written by the
 *       apr_crypto_block_decrypt() call. After this call, the context
 *       is cleaned and can be reused by apr_crypto_block_decrypt_init().
 * @param out Address of a buffer to which data will be written. This
 *            buffer must already exist, and is usually the same
 *            buffer used by apr_evp_crypt(). See note.
 * @param outlen Length of the output will be written here.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred.
 * @return APR_EPADDING if padding was enabled and the block was incorrectly
 *         formatted.
 * @return APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_finish(unsigned char *out,
        apr_size_t *outlen, apr_crypto_block_t *ctx);

/**
 * @brief Clean encryption / decryption context.
 * @note After cleanup, a context is free to be reused if necessary.
 * @param ctx The block context to use.
 * @return Returns APR_ENOTIMPL if not supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_cleanup(apr_crypto_block_t *ctx);

/**
 * @brief Clean encryption / decryption context.
 * @note After cleanup, a context is free to be reused if necessary.
 * @param f The context to use.
 * @return Returns APR_ENOTIMPL if not supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_cleanup(apr_crypto_t *f);

/**
 * @brief Shutdown the crypto library.
 * @note After shutdown, it is expected that the init function can be called again.
 * @param driver - driver to use
 * @return Returns APR_ENOTIMPL if not supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_shutdown(
        const apr_crypto_driver_t *driver);

#endif /* APU_HAVE_CRYPTO */

/** @} */

#ifdef __cplusplus
}
#endif

#endif