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1 /**
2 * \file pk.h
3 *
4 * \brief Public Key abstraction layer
5 */
6 /*
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: GPL-2.0
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 *
24 * This file is part of mbed TLS (https://tls.mbed.org)
25 */
26
27 #ifndef MBEDTLS_PK_H
28 #define MBEDTLS_PK_H
29
30 #if !defined(MBEDTLS_CONFIG_FILE)
31 #include "config.h"
32 #else
33 #include MBEDTLS_CONFIG_FILE
34 #endif
35
36 #include "md.h"
37
38 #if defined(MBEDTLS_RSA_C)
39 #include "rsa.h"
40 #endif
41
42 #if defined(MBEDTLS_ECP_C)
43 #include "ecp.h"
44 #endif
45
46 #if defined(MBEDTLS_ECDSA_C)
47 #include "ecdsa.h"
48 #endif
49
50 #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
51 !defined(inline) && !defined(__cplusplus)
52 #define inline __inline
53 #endif
54
55 #define MBEDTLS_ERR_PK_ALLOC_FAILED -0x3F80 /**< Memory allocation failed. */
56 #define MBEDTLS_ERR_PK_TYPE_MISMATCH -0x3F00 /**< Type mismatch, eg attempt to encrypt with an ECDSA key */
57 #define MBEDTLS_ERR_PK_BAD_INPUT_DATA -0x3E80 /**< Bad input parameters to function. */
58 #define MBEDTLS_ERR_PK_FILE_IO_ERROR -0x3E00 /**< Read/write of file failed. */
59 #define MBEDTLS_ERR_PK_KEY_INVALID_VERSION -0x3D80 /**< Unsupported key version */
60 #define MBEDTLS_ERR_PK_KEY_INVALID_FORMAT -0x3D00 /**< Invalid key tag or value. */
61 #define MBEDTLS_ERR_PK_UNKNOWN_PK_ALG -0x3C80 /**< Key algorithm is unsupported (only RSA and EC are supported). */
62 #define MBEDTLS_ERR_PK_PASSWORD_REQUIRED -0x3C00 /**< Private key password can't be empty. */
63 #define MBEDTLS_ERR_PK_PASSWORD_MISMATCH -0x3B80 /**< Given private key password does not allow for correct decryption. */
64 #define MBEDTLS_ERR_PK_INVALID_PUBKEY -0x3B00 /**< The pubkey tag or value is invalid (only RSA and EC are supported). */
65 #define MBEDTLS_ERR_PK_INVALID_ALG -0x3A80 /**< The algorithm tag or value is invalid. */
66 #define MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE -0x3A00 /**< Elliptic curve is unsupported (only NIST curves are supported). */
67 #define MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE -0x3980 /**< Unavailable feature, e.g. RSA disabled for RSA key. */
68 #define MBEDTLS_ERR_PK_SIG_LEN_MISMATCH -0x3900 /**< The buffer contains a valid signature followed by more data. */
69 #define MBEDTLS_ERR_PK_HW_ACCEL_FAILED -0x3880 /**< PK hardware accelerator failed. */
70
71 #ifdef __cplusplus
72 extern "C" {
73 #endif
74
75 /**
76 * \brief Public key types
77 */
78 typedef enum {
79 MBEDTLS_PK_NONE=0,
80 MBEDTLS_PK_RSA,
81 MBEDTLS_PK_ECKEY,
82 MBEDTLS_PK_ECKEY_DH,
83 MBEDTLS_PK_ECDSA,
84 MBEDTLS_PK_RSA_ALT,
85 MBEDTLS_PK_RSASSA_PSS,
86 } mbedtls_pk_type_t;
87
88 /**
89 * \brief Options for RSASSA-PSS signature verification.
90 * See \c mbedtls_rsa_rsassa_pss_verify_ext()
91 */
92 typedef struct mbedtls_pk_rsassa_pss_options
93 {
94 mbedtls_md_type_t mgf1_hash_id;
95 int expected_salt_len;
96
97 } mbedtls_pk_rsassa_pss_options;
98
99 /**
100 * \brief Types for interfacing with the debug module
101 */
102 typedef enum
103 {
104 MBEDTLS_PK_DEBUG_NONE = 0,
105 MBEDTLS_PK_DEBUG_MPI,
106 MBEDTLS_PK_DEBUG_ECP,
107 } mbedtls_pk_debug_type;
108
109 /**
110 * \brief Item to send to the debug module
111 */
112 typedef struct mbedtls_pk_debug_item
113 {
114 mbedtls_pk_debug_type type;
115 const char *name;
116 void *value;
117 } mbedtls_pk_debug_item;
118
119 /** Maximum number of item send for debugging, plus 1 */
120 #define MBEDTLS_PK_DEBUG_MAX_ITEMS 3
121
122 /**
123 * \brief Public key information and operations
124 */
125 typedef struct mbedtls_pk_info_t mbedtls_pk_info_t;
126
127 /**
128 * \brief Public key container
129 */
130 typedef struct mbedtls_pk_context
131 {
132 const mbedtls_pk_info_t * pk_info; /**< Public key informations */
133 void * pk_ctx; /**< Underlying public key context */
134 } mbedtls_pk_context;
135
136 #if defined(MBEDTLS_RSA_C)
137 /**
138 * Quick access to an RSA context inside a PK context.
139 *
140 * \warning You must make sure the PK context actually holds an RSA context
141 * before using this function!
142 */
143 static inline mbedtls_rsa_context *mbedtls_pk_rsa( const mbedtls_pk_context pk )
144 {
145 return( (mbedtls_rsa_context *) (pk).pk_ctx );
146 }
147 #endif /* MBEDTLS_RSA_C */
148
149 #if defined(MBEDTLS_ECP_C)
150 /**
151 * Quick access to an EC context inside a PK context.
152 *
153 * \warning You must make sure the PK context actually holds an EC context
154 * before using this function!
155 */
156 static inline mbedtls_ecp_keypair *mbedtls_pk_ec( const mbedtls_pk_context pk )
157 {
158 return( (mbedtls_ecp_keypair *) (pk).pk_ctx );
159 }
160 #endif /* MBEDTLS_ECP_C */
161
162 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
163 /**
164 * \brief Types for RSA-alt abstraction
165 */
166 typedef int (*mbedtls_pk_rsa_alt_decrypt_func)( void *ctx, int mode, size_t *olen,
167 const unsigned char *input, unsigned char *output,
168 size_t output_max_len );
169 typedef int (*mbedtls_pk_rsa_alt_sign_func)( void *ctx,
170 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
171 int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
172 const unsigned char *hash, unsigned char *sig );
173 typedef size_t (*mbedtls_pk_rsa_alt_key_len_func)( void *ctx );
174 #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
175
176 /**
177 * \brief Return information associated with the given PK type
178 *
179 * \param pk_type PK type to search for.
180 *
181 * \return The PK info associated with the type or NULL if not found.
182 */
183 const mbedtls_pk_info_t *mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type );
184
185 /**
186 * \brief Initialize a mbedtls_pk_context (as NONE)
187 */
188 void mbedtls_pk_init( mbedtls_pk_context *ctx );
189
190 /**
191 * \brief Free a mbedtls_pk_context
192 */
193 void mbedtls_pk_free( mbedtls_pk_context *ctx );
194
195 /**
196 * \brief Initialize a PK context with the information given
197 * and allocates the type-specific PK subcontext.
198 *
199 * \param ctx Context to initialize. Must be empty (type NONE).
200 * \param info Information to use
201 *
202 * \return 0 on success,
203 * MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input,
204 * MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
205 *
206 * \note For contexts holding an RSA-alt key, use
207 * \c mbedtls_pk_setup_rsa_alt() instead.
208 */
209 int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info );
210
211 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
212 /**
213 * \brief Initialize an RSA-alt context
214 *
215 * \param ctx Context to initialize. Must be empty (type NONE).
216 * \param key RSA key pointer
217 * \param decrypt_func Decryption function
218 * \param sign_func Signing function
219 * \param key_len_func Function returning key length in bytes
220 *
221 * \return 0 on success, or MBEDTLS_ERR_PK_BAD_INPUT_DATA if the
222 * context wasn't already initialized as RSA_ALT.
223 *
224 * \note This function replaces \c mbedtls_pk_setup() for RSA-alt.
225 */
226 int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
227 mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
228 mbedtls_pk_rsa_alt_sign_func sign_func,
229 mbedtls_pk_rsa_alt_key_len_func key_len_func );
230 #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
231
232 /**
233 * \brief Get the size in bits of the underlying key
234 *
235 * \param ctx Context to use
236 *
237 * \return Key size in bits, or 0 on error
238 */
239 size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx );
240
241 /**
242 * \brief Get the length in bytes of the underlying key
243 * \param ctx Context to use
244 *
245 * \return Key length in bytes, or 0 on error
246 */
247 static inline size_t mbedtls_pk_get_len( const mbedtls_pk_context *ctx )
248 {
249 return( ( mbedtls_pk_get_bitlen( ctx ) + 7 ) / 8 );
250 }
251
252 /**
253 * \brief Tell if a context can do the operation given by type
254 *
255 * \param ctx Context to test
256 * \param type Target type
257 *
258 * \return 0 if context can't do the operations,
259 * 1 otherwise.
260 */
261 int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type );
262
263 /**
264 * \brief Verify signature (including padding if relevant).
265 *
266 * \param ctx PK context to use
267 * \param md_alg Hash algorithm used (see notes)
268 * \param hash Hash of the message to sign
269 * \param hash_len Hash length or 0 (see notes)
270 * \param sig Signature to verify
271 * \param sig_len Signature length
272 *
273 * \return 0 on success (signature is valid),
274 * #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
275 * signature in sig but its length is less than \p siglen,
276 * or a specific error code.
277 *
278 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
279 * Use \c mbedtls_pk_verify_ext( MBEDTLS_PK_RSASSA_PSS, ... )
280 * to verify RSASSA_PSS signatures.
281 *
282 * \note If hash_len is 0, then the length associated with md_alg
283 * is used instead, or an error returned if it is invalid.
284 *
285 * \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
286 */
287 int mbedtls_pk_verify( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
288 const unsigned char *hash, size_t hash_len,
289 const unsigned char *sig, size_t sig_len );
290
291 /**
292 * \brief Verify signature, with options.
293 * (Includes verification of the padding depending on type.)
294 *
295 * \param type Signature type (inc. possible padding type) to verify
296 * \param options Pointer to type-specific options, or NULL
297 * \param ctx PK context to use
298 * \param md_alg Hash algorithm used (see notes)
299 * \param hash Hash of the message to sign
300 * \param hash_len Hash length or 0 (see notes)
301 * \param sig Signature to verify
302 * \param sig_len Signature length
303 *
304 * \return 0 on success (signature is valid),
305 * #MBEDTLS_ERR_PK_TYPE_MISMATCH if the PK context can't be
306 * used for this type of signatures,
307 * #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
308 * signature in sig but its length is less than \p siglen,
309 * or a specific error code.
310 *
311 * \note If hash_len is 0, then the length associated with md_alg
312 * is used instead, or an error returned if it is invalid.
313 *
314 * \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
315 *
316 * \note If type is MBEDTLS_PK_RSASSA_PSS, then options must point
317 * to a mbedtls_pk_rsassa_pss_options structure,
318 * otherwise it must be NULL.
319 */
320 int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
321 mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
322 const unsigned char *hash, size_t hash_len,
323 const unsigned char *sig, size_t sig_len );
324
325 /**
326 * \brief Make signature, including padding if relevant.
327 *
328 * \param ctx PK context to use - must hold a private key
329 * \param md_alg Hash algorithm used (see notes)
330 * \param hash Hash of the message to sign
331 * \param hash_len Hash length or 0 (see notes)
332 * \param sig Place to write the signature
333 * \param sig_len Number of bytes written
334 * \param f_rng RNG function
335 * \param p_rng RNG parameter
336 *
337 * \return 0 on success, or a specific error code.
338 *
339 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
340 * There is no interface in the PK module to make RSASSA-PSS
341 * signatures yet.
342 *
343 * \note If hash_len is 0, then the length associated with md_alg
344 * is used instead, or an error returned if it is invalid.
345 *
346 * \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
347 * For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
348 */
349 int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
350 const unsigned char *hash, size_t hash_len,
351 unsigned char *sig, size_t *sig_len,
352 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
353
354 /**
355 * \brief Decrypt message (including padding if relevant).
356 *
357 * \param ctx PK context to use - must hold a private key
358 * \param input Input to decrypt
359 * \param ilen Input size
360 * \param output Decrypted output
361 * \param olen Decrypted message length
362 * \param osize Size of the output buffer
363 * \param f_rng RNG function
364 * \param p_rng RNG parameter
365 *
366 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
367 *
368 * \return 0 on success, or a specific error code.
369 */
370 int mbedtls_pk_decrypt( mbedtls_pk_context *ctx,
371 const unsigned char *input, size_t ilen,
372 unsigned char *output, size_t *olen, size_t osize,
373 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
374
375 /**
376 * \brief Encrypt message (including padding if relevant).
377 *
378 * \param ctx PK context to use
379 * \param input Message to encrypt
380 * \param ilen Message size
381 * \param output Encrypted output
382 * \param olen Encrypted output length
383 * \param osize Size of the output buffer
384 * \param f_rng RNG function
385 * \param p_rng RNG parameter
386 *
387 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
388 *
389 * \return 0 on success, or a specific error code.
390 */
391 int mbedtls_pk_encrypt( mbedtls_pk_context *ctx,
392 const unsigned char *input, size_t ilen,
393 unsigned char *output, size_t *olen, size_t osize,
394 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
395
396 /**
397 * \brief Check if a public-private pair of keys matches.
398 *
399 * \param pub Context holding a public key.
400 * \param prv Context holding a private (and public) key.
401 *
402 * \return 0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
403 */
404 int mbedtls_pk_check_pair( const mbedtls_pk_context *pub, const mbedtls_pk_context *prv );
405
406 /**
407 * \brief Export debug information
408 *
409 * \param ctx Context to use
410 * \param items Place to write debug items
411 *
412 * \return 0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
413 */
414 int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items );
415
416 /**
417 * \brief Access the type name
418 *
419 * \param ctx Context to use
420 *
421 * \return Type name on success, or "invalid PK"
422 */
423 const char * mbedtls_pk_get_name( const mbedtls_pk_context *ctx );
424
425 /**
426 * \brief Get the key type
427 *
428 * \param ctx Context to use
429 *
430 * \return Type on success, or MBEDTLS_PK_NONE
431 */
432 mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx );
433
434 #if defined(MBEDTLS_PK_PARSE_C)
435 /** \ingroup pk_module */
436 /**
437 * \brief Parse a private key in PEM or DER format
438 *
439 * \param ctx key to be initialized
440 * \param key input buffer
441 * \param keylen size of the buffer
442 * (including the terminating null byte for PEM data)
443 * \param pwd password for decryption (optional)
444 * \param pwdlen size of the password
445 *
446 * \note On entry, ctx must be empty, either freshly initialised
447 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
448 * specific key type, check the result with mbedtls_pk_can_do().
449 *
450 * \note The key is also checked for correctness.
451 *
452 * \return 0 if successful, or a specific PK or PEM error code
453 */
454 int mbedtls_pk_parse_key( mbedtls_pk_context *ctx,
455 const unsigned char *key, size_t keylen,
456 const unsigned char *pwd, size_t pwdlen );
457
458 /** \ingroup pk_module */
459 /**
460 * \brief Parse a public key in PEM or DER format
461 *
462 * \param ctx key to be initialized
463 * \param key input buffer
464 * \param keylen size of the buffer
465 * (including the terminating null byte for PEM data)
466 *
467 * \note On entry, ctx must be empty, either freshly initialised
468 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
469 * specific key type, check the result with mbedtls_pk_can_do().
470 *
471 * \note The key is also checked for correctness.
472 *
473 * \return 0 if successful, or a specific PK or PEM error code
474 */
475 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
476 const unsigned char *key, size_t keylen );
477
478 #if defined(MBEDTLS_FS_IO)
479 /** \ingroup pk_module */
480 /**
481 * \brief Load and parse a private key
482 *
483 * \param ctx key to be initialized
484 * \param path filename to read the private key from
485 * \param password password to decrypt the file (can be NULL)
486 *
487 * \note On entry, ctx must be empty, either freshly initialised
488 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
489 * specific key type, check the result with mbedtls_pk_can_do().
490 *
491 * \note The key is also checked for correctness.
492 *
493 * \return 0 if successful, or a specific PK or PEM error code
494 */
495 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
496 const char *path, const char *password );
497
498 /** \ingroup pk_module */
499 /**
500 * \brief Load and parse a public key
501 *
502 * \param ctx key to be initialized
503 * \param path filename to read the public key from
504 *
505 * \note On entry, ctx must be empty, either freshly initialised
506 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If
507 * you need a specific key type, check the result with
508 * mbedtls_pk_can_do().
509 *
510 * \note The key is also checked for correctness.
511 *
512 * \return 0 if successful, or a specific PK or PEM error code
513 */
514 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path );
515 #endif /* MBEDTLS_FS_IO */
516 #endif /* MBEDTLS_PK_PARSE_C */
517
518 #if defined(MBEDTLS_PK_WRITE_C)
519 /**
520 * \brief Write a private key to a PKCS#1 or SEC1 DER structure
521 * Note: data is written at the end of the buffer! Use the
522 * return value to determine where you should start
523 * using the buffer
524 *
525 * \param ctx private to write away
526 * \param buf buffer to write to
527 * \param size size of the buffer
528 *
529 * \return length of data written if successful, or a specific
530 * error code
531 */
532 int mbedtls_pk_write_key_der( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
533
534 /**
535 * \brief Write a public key to a SubjectPublicKeyInfo DER structure
536 * Note: data is written at the end of the buffer! Use the
537 * return value to determine where you should start
538 * using the buffer
539 *
540 * \param ctx public key to write away
541 * \param buf buffer to write to
542 * \param size size of the buffer
543 *
544 * \return length of data written if successful, or a specific
545 * error code
546 */
547 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
548
549 #if defined(MBEDTLS_PEM_WRITE_C)
550 /**
551 * \brief Write a public key to a PEM string
552 *
553 * \param ctx public key to write away
554 * \param buf buffer to write to
555 * \param size size of the buffer
556 *
557 * \return 0 if successful, or a specific error code
558 */
559 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
560
561 /**
562 * \brief Write a private key to a PKCS#1 or SEC1 PEM string
563 *
564 * \param ctx private to write away
565 * \param buf buffer to write to
566 * \param size size of the buffer
567 *
568 * \return 0 if successful, or a specific error code
569 */
570 int mbedtls_pk_write_key_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
571 #endif /* MBEDTLS_PEM_WRITE_C */
572 #endif /* MBEDTLS_PK_WRITE_C */
573
574 /*
575 * WARNING: Low-level functions. You probably do not want to use these unless
576 * you are certain you do ;)
577 */
578
579 #if defined(MBEDTLS_PK_PARSE_C)
580 /**
581 * \brief Parse a SubjectPublicKeyInfo DER structure
582 *
583 * \param p the position in the ASN.1 data
584 * \param end end of the buffer
585 * \param pk the key to fill
586 *
587 * \return 0 if successful, or a specific PK error code
588 */
589 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
590 mbedtls_pk_context *pk );
591 #endif /* MBEDTLS_PK_PARSE_C */
592
593 #if defined(MBEDTLS_PK_WRITE_C)
594 /**
595 * \brief Write a subjectPublicKey to ASN.1 data
596 * Note: function works backwards in data buffer
597 *
598 * \param p reference to current position pointer
599 * \param start start of the buffer (for bounds-checking)
600 * \param key public key to write away
601 *
602 * \return the length written or a negative error code
603 */
604 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
605 const mbedtls_pk_context *key );
606 #endif /* MBEDTLS_PK_WRITE_C */
607
608 /*
609 * Internal module functions. You probably do not want to use these unless you
610 * know you do.
611 */
612 #if defined(MBEDTLS_FS_IO)
613 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n );
614 #endif
615
616 #ifdef __cplusplus
617 }
618 #endif
619
620 #endif /* MBEDTLS_PK_H */
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