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pkparse.c

Last change on this file was 20366, checked in by Itms, 7 years ago

Alpha 12 version of Premake 5, including prebuilt binary for Windows.
Directly taken from https://premake.github.io/.

File size: 38.2 KB

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1	/*
2	* Public Key layer for parsing key files and structures
3	*
4	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5	* SPDX-License-Identifier: Apache-2.0
6	*
7	* Licensed under the Apache License, Version 2.0 (the "License"); you may
8	* not use this file except in compliance with the License.
9	* You may obtain a copy of the License at
10	*
11	* http://www.apache.org/licenses/LICENSE-2.0
12	*
13	* Unless required by applicable law or agreed to in writing, software
14	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16	* See the License for the specific language governing permissions and
17	* limitations under the License.
18	*
19	* This file is part of mbed TLS (https://tls.mbed.org)
20	*/
21
22	#if !defined(MBEDTLS_CONFIG_FILE)
23	#include "mbedtls/config.h"
24	#else
25	#include MBEDTLS_CONFIG_FILE
26	#endif
27
28	#if defined(MBEDTLS_PK_PARSE_C)
29
30	#include "mbedtls/pk.h"
31	#include "mbedtls/asn1.h"
32	#include "mbedtls/oid.h"
33
34	#include <string.h>
35
36	#if defined(MBEDTLS_RSA_C)
37	#include "mbedtls/rsa.h"
38	#endif
39	#if defined(MBEDTLS_ECP_C)
40	#include "mbedtls/ecp.h"
41	#endif
42	#if defined(MBEDTLS_ECDSA_C)
43	#include "mbedtls/ecdsa.h"
44	#endif
45	#if defined(MBEDTLS_PEM_PARSE_C)
46	#include "mbedtls/pem.h"
47	#endif
48	#if defined(MBEDTLS_PKCS5_C)
49	#include "mbedtls/pkcs5.h"
50	#endif
51	#if defined(MBEDTLS_PKCS12_C)
52	#include "mbedtls/pkcs12.h"
53	#endif
54
55	#if defined(MBEDTLS_PLATFORM_C)
56	#include "mbedtls/platform.h"
57	#else
58	#include <stdlib.h>
59	#define mbedtls_calloc calloc
60	#define mbedtls_free free
61	#endif
62
63	#if defined(MBEDTLS_FS_IO)
64	/* Implementation that should never be optimized out by the compiler */
65	static void mbedtls_zeroize( void *v, size_t n ) {
66	volatile unsigned char p = v; while( n-- ) p++ = 0;
67	}
68
69	/*
70	* Load all data from a file into a given buffer.
71	*
72	* The file is expected to contain either PEM or DER encoded data.
73	* A terminating null byte is always appended. It is included in the announced
74	* length only if the data looks like it is PEM encoded.
75	*/
76	int mbedtls_pk_load_file( const char path, unsigned char buf, size_t n )
77	{
78	FILE *f;
79	long size;
80
81	if( ( f = fopen( path, "rb" ) ) == NULL )
82	return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
83
84	fseek( f, 0, SEEK_END );
85	if( ( size = ftell( f ) ) == -1 )
86	{
87	fclose( f );
88	return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
89	}
90	fseek( f, 0, SEEK_SET );
91
92	*n = (size_t) size;
93
94	if( *n + 1 == 0 \|\|
95	( buf = mbedtls_calloc( 1, n + 1 ) ) == NULL )
96	{
97	fclose( f );
98	return( MBEDTLS_ERR_PK_ALLOC_FAILED );
99	}
100
101	if( fread( buf, 1, n, f ) != *n )
102	{
103	fclose( f );
104	mbedtls_free( *buf );
105	return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
106	}
107
108	fclose( f );
109
110	(buf)[n] = '\0';
111
112	if( strstr( (const char ) buf, "-----BEGIN " ) != NULL )
113	++*n;
114
115	return( 0 );
116	}
117
118	/*
119	* Load and parse a private key
120	*/
121	int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
122	const char path, const char pwd )
123	{
124	int ret;
125	size_t n;
126	unsigned char *buf;
127
128	if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
129	return( ret );
130
131	if( pwd == NULL )
132	ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
133	else
134	ret = mbedtls_pk_parse_key( ctx, buf, n,
135	(const unsigned char *) pwd, strlen( pwd ) );
136
137	mbedtls_zeroize( buf, n );
138	mbedtls_free( buf );
139
140	return( ret );
141	}
142
143	/*
144	* Load and parse a public key
145	*/
146	int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context ctx, const char path )
147	{
148	int ret;
149	size_t n;
150	unsigned char *buf;
151
152	if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
153	return( ret );
154
155	ret = mbedtls_pk_parse_public_key( ctx, buf, n );
156
157	mbedtls_zeroize( buf, n );
158	mbedtls_free( buf );
159
160	return( ret );
161	}
162	#endif /* MBEDTLS_FS_IO */
163
164	#if defined(MBEDTLS_ECP_C)
165	/* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
166	*
167	* ECParameters ::= CHOICE {
168	* namedCurve OBJECT IDENTIFIER
169	* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
170	* -- implicitCurve NULL
171	* }
172	*/
173	static int pk_get_ecparams( unsigned char *p, const unsigned char end,
174	mbedtls_asn1_buf *params )
175	{
176	int ret;
177
178	/* Tag may be either OID or SEQUENCE */
179	params->tag = **p;
180	if( params->tag != MBEDTLS_ASN1_OID
181	#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
182	&& params->tag != ( MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE )
183	#endif
184	)
185	{
186	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
187	MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
188	}
189
190	if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
191	{
192	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
193	}
194
195	params->p = *p;
196	*p += params->len;
197
198	if( *p != end )
199	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
200	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
201
202	return( 0 );
203	}
204
205	#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
206	/*
207	* Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
208	* WARNING: the resulting group should only be used with
209	* pk_group_id_from_specified(), since its base point may not be set correctly
210	* if it was encoded compressed.
211	*
212	* SpecifiedECDomain ::= SEQUENCE {
213	* version SpecifiedECDomainVersion(ecdpVer1 \| ecdpVer2 \| ecdpVer3, ...),
214	* fieldID FieldID {{FieldTypes}},
215	* curve Curve,
216	* base ECPoint,
217	* order INTEGER,
218	* cofactor INTEGER OPTIONAL,
219	* hash HashAlgorithm OPTIONAL,
220	* ...
221	* }
222	*
223	* We only support prime-field as field type, and ignore hash and cofactor.
224	*/
225	static int pk_group_from_specified( const mbedtls_asn1_buf params, mbedtls_ecp_group grp )
226	{
227	int ret;
228	unsigned char *p = params->p;
229	const unsigned char * const end = params->p + params->len;
230	const unsigned char end_field, end_curve;
231	size_t len;
232	int ver;
233
234	/* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
235	if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
236	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
237
238	if( ver < 1 \|\| ver > 3 )
239	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
240
241	/*
242	* FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
243	* fieldType FIELD-ID.&id({IOSet}),
244	* parameters FIELD-ID.&Type({IOSet}{@fieldType})
245	* }
246	*/
247	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
248	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
249	return( ret );
250
251	end_field = p + len;
252
253	/*
254	* FIELD-ID ::= TYPE-IDENTIFIER
255	* FieldTypes FIELD-ID ::= {
256	* { Prime-p IDENTIFIED BY prime-field } \|
257	* { Characteristic-two IDENTIFIED BY characteristic-two-field }
258	* }
259	* prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
260	*/
261	if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
262	return( ret );
263
264	if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) \|\|
265	memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
266	{
267	return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
268	}
269
270	p += len;
271
272	/* Prime-p ::= INTEGER -- Field of size p. */
273	if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
274	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
275
276	grp->pbits = mbedtls_mpi_bitlen( &grp->P );
277
278	if( p != end_field )
279	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
280	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
281
282	/*
283	* Curve ::= SEQUENCE {
284	* a FieldElement,
285	* b FieldElement,
286	* seed BIT STRING OPTIONAL
287	* -- Shall be present if used in SpecifiedECDomain
288	* -- with version equal to ecdpVer2 or ecdpVer3
289	* }
290	*/
291	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
292	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
293	return( ret );
294
295	end_curve = p + len;
296
297	/*
298	* FieldElement ::= OCTET STRING
299	* containing an integer in the case of a prime field
300	*/
301	if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 \|\|
302	( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
303	{
304	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
305	}
306
307	p += len;
308
309	if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 \|\|
310	( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
311	{
312	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
313	}
314
315	p += len;
316
317	/* Ignore seed BIT STRING OPTIONAL */
318	if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
319	p += len;
320
321	if( p != end_curve )
322	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
323	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
324
325	/*
326	* ECPoint ::= OCTET STRING
327	*/
328	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
329	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
330
331	if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
332	( const unsigned char *) p, len ) ) != 0 )
333	{
334	/*
335	* If we can't read the point because it's compressed, cheat by
336	* reading only the X coordinate and the parity bit of Y.
337	*/
338	if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE \|\|
339	( p[0] != 0x02 && p[0] != 0x03 ) \|\|
340	len != mbedtls_mpi_size( &grp->P ) + 1 \|\|
341	mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 \|\|
342	mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 \|\|
343	mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
344	{
345	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
346	}
347	}
348
349	p += len;
350
351	/*
352	* order INTEGER
353	*/
354	if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
355	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
356
357	grp->nbits = mbedtls_mpi_bitlen( &grp->N );
358
359	/*
360	* Allow optional elements by purposefully not enforcing p == end here.
361	*/
362
363	return( 0 );
364	}
365
366	/*
367	* Find the group id associated with an (almost filled) group as generated by
368	* pk_group_from_specified(), or return an error if unknown.
369	*/
370	static int pk_group_id_from_group( const mbedtls_ecp_group grp, mbedtls_ecp_group_id grp_id )
371	{
372	int ret = 0;
373	mbedtls_ecp_group ref;
374	const mbedtls_ecp_group_id *id;
375
376	mbedtls_ecp_group_init( &ref );
377
378	for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
379	{
380	/* Load the group associated to that id */
381	mbedtls_ecp_group_free( &ref );
382	MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
383
384	/* Compare to the group we were given, starting with easy tests */
385	if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
386	mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
387	mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
388	mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
389	mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
390	mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
391	mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
392	/* For Y we may only know the parity bit, so compare only that */
393	mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
394	{
395	break;
396	}
397
398	}
399
400	cleanup:
401	mbedtls_ecp_group_free( &ref );
402
403	grp_id = id;
404
405	if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
406	ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
407
408	return( ret );
409	}
410
411	/*
412	* Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
413	*/
414	static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
415	mbedtls_ecp_group_id *grp_id )
416	{
417	int ret;
418	mbedtls_ecp_group grp;
419
420	mbedtls_ecp_group_init( &grp );
421
422	if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
423	goto cleanup;
424
425	ret = pk_group_id_from_group( &grp, grp_id );
426
427	cleanup:
428	mbedtls_ecp_group_free( &grp );
429
430	return( ret );
431	}
432	#endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
433
434	/*
435	* Use EC parameters to initialise an EC group
436	*
437	* ECParameters ::= CHOICE {
438	* namedCurve OBJECT IDENTIFIER
439	* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
440	* -- implicitCurve NULL
441	*/
442	static int pk_use_ecparams( const mbedtls_asn1_buf params, mbedtls_ecp_group grp )
443	{
444	int ret;
445	mbedtls_ecp_group_id grp_id;
446
447	if( params->tag == MBEDTLS_ASN1_OID )
448	{
449	if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
450	return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
451	}
452	else
453	{
454	#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
455	if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
456	return( ret );
457	#else
458	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
459	#endif
460	}
461
462	/*
463	* grp may already be initilialized; if so, make sure IDs match
464	*/
465	if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
466	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
467
468	if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
469	return( ret );
470
471	return( 0 );
472	}
473
474	/*
475	* EC public key is an EC point
476	*
477	* The caller is responsible for clearing the structure upon failure if
478	* desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
479	* return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
480	*/
481	static int pk_get_ecpubkey( unsigned char *p, const unsigned char end,
482	mbedtls_ecp_keypair *key )
483	{
484	int ret;
485
486	if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
487	(const unsigned char ) p, end - *p ) ) == 0 )
488	{
489	ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
490	}
491
492	/*
493	* We know mbedtls_ecp_point_read_binary consumed all bytes or failed
494	*/
495	p = (unsigned char ) end;
496
497	return( ret );
498	}
499	#endif /* MBEDTLS_ECP_C */
500
501	#if defined(MBEDTLS_RSA_C)
502	/*
503	* RSAPublicKey ::= SEQUENCE {
504	* modulus INTEGER, -- n
505	* publicExponent INTEGER -- e
506	* }
507	*/
508	static int pk_get_rsapubkey( unsigned char **p,
509	const unsigned char *end,
510	mbedtls_rsa_context *rsa )
511	{
512	int ret;
513	size_t len;
514
515	if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
516	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
517	return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
518
519	if( *p + len != end )
520	return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
521	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
522
523	if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 \|\|
524	( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
525	return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
526
527	if( *p != end )
528	return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
529	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
530
531	if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
532	return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
533
534	rsa->len = mbedtls_mpi_size( &rsa->N );
535
536	return( 0 );
537	}
538	#endif /* MBEDTLS_RSA_C */
539
540	/* Get a PK algorithm identifier
541	*
542	* AlgorithmIdentifier ::= SEQUENCE {
543	* algorithm OBJECT IDENTIFIER,
544	* parameters ANY DEFINED BY algorithm OPTIONAL }
545	*/
546	static int pk_get_pk_alg( unsigned char **p,
547	const unsigned char *end,
548	mbedtls_pk_type_t pk_alg, mbedtls_asn1_buf params )
549	{
550	int ret;
551	mbedtls_asn1_buf alg_oid;
552
553	memset( params, 0, sizeof(mbedtls_asn1_buf) );
554
555	if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
556	return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
557
558	if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
559	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
560
561	/*
562	* No parameters with RSA (only for EC)
563	*/
564	if( *pk_alg == MBEDTLS_PK_RSA &&
565	( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) \|\|
566	params->len != 0 ) )
567	{
568	return( MBEDTLS_ERR_PK_INVALID_ALG );
569	}
570
571	return( 0 );
572	}
573
574	/*
575	* SubjectPublicKeyInfo ::= SEQUENCE {
576	* algorithm AlgorithmIdentifier,
577	* subjectPublicKey BIT STRING }
578	*/
579	int mbedtls_pk_parse_subpubkey( unsigned char *p, const unsigned char end,
580	mbedtls_pk_context *pk )
581	{
582	int ret;
583	size_t len;
584	mbedtls_asn1_buf alg_params;
585	mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
586	const mbedtls_pk_info_t *pk_info;
587
588	if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
589	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
590	{
591	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
592	}
593
594	end = *p + len;
595
596	if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
597	return( ret );
598
599	if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
600	return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
601
602	if( *p + len != end )
603	return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
604	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
605
606	if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
607	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
608
609	if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
610	return( ret );
611
612	#if defined(MBEDTLS_RSA_C)
613	if( pk_alg == MBEDTLS_PK_RSA )
614	{
615	ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
616	} else
617	#endif /* MBEDTLS_RSA_C */
618	#if defined(MBEDTLS_ECP_C)
619	if( pk_alg == MBEDTLS_PK_ECKEY_DH \|\| pk_alg == MBEDTLS_PK_ECKEY )
620	{
621	ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
622	if( ret == 0 )
623	ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
624	} else
625	#endif /* MBEDTLS_ECP_C */
626	ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
627
628	if( ret == 0 && *p != end )
629	ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
630	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
631
632	if( ret != 0 )
633	mbedtls_pk_free( pk );
634
635	return( ret );
636	}
637
638	#if defined(MBEDTLS_RSA_C)
639	/*
640	* Parse a PKCS#1 encoded private RSA key
641	*/
642	static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
643	const unsigned char *key,
644	size_t keylen )
645	{
646	int ret;
647	size_t len;
648	unsigned char p, end;
649
650	p = (unsigned char *) key;
651	end = p + keylen;
652
653	/*
654	* This function parses the RSAPrivateKey (PKCS#1)
655	*
656	* RSAPrivateKey ::= SEQUENCE {
657	* version Version,
658	* modulus INTEGER, -- n
659	* publicExponent INTEGER, -- e
660	* privateExponent INTEGER, -- d
661	* prime1 INTEGER, -- p
662	* prime2 INTEGER, -- q
663	* exponent1 INTEGER, -- d mod (p-1)
664	* exponent2 INTEGER, -- d mod (q-1)
665	* coefficient INTEGER, -- (inverse of q) mod p
666	* otherPrimeInfos OtherPrimeInfos OPTIONAL
667	* }
668	*/
669	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
670	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
671	{
672	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
673	}
674
675	end = p + len;
676
677	if( ( ret = mbedtls_asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
678	{
679	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
680	}
681
682	if( rsa->ver != 0 )
683	{
684	return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
685	}
686
687	if( ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->N ) ) != 0 \|\|
688	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->E ) ) != 0 \|\|
689	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->D ) ) != 0 \|\|
690	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->P ) ) != 0 \|\|
691	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 \|\|
692	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 \|\|
693	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 \|\|
694	( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
695	{
696	mbedtls_rsa_free( rsa );
697	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
698	}
699
700	rsa->len = mbedtls_mpi_size( &rsa->N );
701
702	if( p != end )
703	{
704	mbedtls_rsa_free( rsa );
705	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
706	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
707	}
708
709	if( ( ret = mbedtls_rsa_check_privkey( rsa ) ) != 0 )
710	{
711	mbedtls_rsa_free( rsa );
712	return( ret );
713	}
714
715	return( 0 );
716	}
717	#endif /* MBEDTLS_RSA_C */
718
719	#if defined(MBEDTLS_ECP_C)
720	/*
721	* Parse a SEC1 encoded private EC key
722	*/
723	static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
724	const unsigned char *key,
725	size_t keylen )
726	{
727	int ret;
728	int version, pubkey_done;
729	size_t len;
730	mbedtls_asn1_buf params;
731	unsigned char p = (unsigned char ) key;
732	unsigned char *end = p + keylen;
733	unsigned char *end2;
734
735	/*
736	* RFC 5915, or SEC1 Appendix C.4
737	*
738	* ECPrivateKey ::= SEQUENCE {
739	* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
740	* privateKey OCTET STRING,
741	* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
742	* publicKey [1] BIT STRING OPTIONAL
743	* }
744	*/
745	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
746	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
747	{
748	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
749	}
750
751	end = p + len;
752
753	if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
754	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
755
756	if( version != 1 )
757	return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
758
759	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
760	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
761
762	if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
763	{
764	mbedtls_ecp_keypair_free( eck );
765	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
766	}
767
768	p += len;
769
770	pubkey_done = 0;
771	if( p != end )
772	{
773	/*
774	* Is 'parameters' present?
775	*/
776	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
777	MBEDTLS_ASN1_CONTEXT_SPECIFIC \| MBEDTLS_ASN1_CONSTRUCTED \| 0 ) ) == 0 )
778	{
779	if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 \|\|
780	( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
781	{
782	mbedtls_ecp_keypair_free( eck );
783	return( ret );
784	}
785	}
786	else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
787	{
788	mbedtls_ecp_keypair_free( eck );
789	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
790	}
791
792	/*
793	* Is 'publickey' present? If not, or if we can't read it (eg because it
794	* is compressed), create it from the private key.
795	*/
796	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
797	MBEDTLS_ASN1_CONTEXT_SPECIFIC \| MBEDTLS_ASN1_CONSTRUCTED \| 1 ) ) == 0 )
798	{
799	end2 = p + len;
800
801	if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
802	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
803
804	if( p + len != end2 )
805	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
806	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
807
808	if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
809	pubkey_done = 1;
810	else
811	{
812	/*
813	* The only acceptable failure mode of pk_get_ecpubkey() above
814	* is if the point format is not recognized.
815	*/
816	if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
817	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
818	}
819	}
820	else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
821	{
822	mbedtls_ecp_keypair_free( eck );
823	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
824	}
825	}
826
827	if( ! pubkey_done &&
828	( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
829	NULL, NULL ) ) != 0 )
830	{
831	mbedtls_ecp_keypair_free( eck );
832	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
833	}
834
835	if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
836	{
837	mbedtls_ecp_keypair_free( eck );
838	return( ret );
839	}
840
841	return( 0 );
842	}
843	#endif /* MBEDTLS_ECP_C */
844
845	/*
846	* Parse an unencrypted PKCS#8 encoded private key
847	*/
848	static int pk_parse_key_pkcs8_unencrypted_der(
849	mbedtls_pk_context *pk,
850	const unsigned char* key,
851	size_t keylen )
852	{
853	int ret, version;
854	size_t len;
855	mbedtls_asn1_buf params;
856	unsigned char p = (unsigned char ) key;
857	unsigned char *end = p + keylen;
858	mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
859	const mbedtls_pk_info_t *pk_info;
860
861	/*
862	* This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
863	*
864	* PrivateKeyInfo ::= SEQUENCE {
865	* version Version,
866	* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
867	* privateKey PrivateKey,
868	* attributes [0] IMPLICIT Attributes OPTIONAL }
869	*
870	* Version ::= INTEGER
871	* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
872	* PrivateKey ::= OCTET STRING
873	*
874	* The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
875	*/
876
877	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
878	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
879	{
880	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
881	}
882
883	end = p + len;
884
885	if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
886	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
887
888	if( version != 0 )
889	return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
890
891	if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
892	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
893
894	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
895	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
896
897	if( len < 1 )
898	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
899	MBEDTLS_ERR_ASN1_OUT_OF_DATA );
900
901	if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
902	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
903
904	if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
905	return( ret );
906
907	#if defined(MBEDTLS_RSA_C)
908	if( pk_alg == MBEDTLS_PK_RSA )
909	{
910	if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
911	{
912	mbedtls_pk_free( pk );
913	return( ret );
914	}
915	} else
916	#endif /* MBEDTLS_RSA_C */
917	#if defined(MBEDTLS_ECP_C)
918	if( pk_alg == MBEDTLS_PK_ECKEY \|\| pk_alg == MBEDTLS_PK_ECKEY_DH )
919	{
920	if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 \|\|
921	( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
922	{
923	mbedtls_pk_free( pk );
924	return( ret );
925	}
926	} else
927	#endif /* MBEDTLS_ECP_C */
928	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
929
930	return( 0 );
931	}
932
933	/*
934	* Parse an encrypted PKCS#8 encoded private key
935	*/
936	#if defined(MBEDTLS_PKCS12_C) \|\| defined(MBEDTLS_PKCS5_C)
937	static int pk_parse_key_pkcs8_encrypted_der(
938	mbedtls_pk_context *pk,
939	const unsigned char *key, size_t keylen,
940	const unsigned char *pwd, size_t pwdlen )
941	{
942	int ret, decrypted = 0;
943	size_t len;
944	unsigned char buf[2048];
945	unsigned char p, end;
946	mbedtls_asn1_buf pbe_alg_oid, pbe_params;
947	#if defined(MBEDTLS_PKCS12_C)
948	mbedtls_cipher_type_t cipher_alg;
949	mbedtls_md_type_t md_alg;
950	#endif
951
952	memset( buf, 0, sizeof( buf ) );
953
954	p = (unsigned char *) key;
955	end = p + keylen;
956
957	if( pwdlen == 0 )
958	return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
959
960	/*
961	* This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
962	*
963	* EncryptedPrivateKeyInfo ::= SEQUENCE {
964	* encryptionAlgorithm EncryptionAlgorithmIdentifier,
965	* encryptedData EncryptedData
966	* }
967	*
968	* EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
969	*
970	* EncryptedData ::= OCTET STRING
971	*
972	* The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
973	*/
974	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
975	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
976	{
977	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
978	}
979
980	end = p + len;
981
982	if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
983	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
984
985	if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
986	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
987
988	if( len > sizeof( buf ) )
989	return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
990
991	/*
992	* Decrypt EncryptedData with appropriate PDE
993	*/
994	#if defined(MBEDTLS_PKCS12_C)
995	if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
996	{
997	if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
998	cipher_alg, md_alg,
999	pwd, pwdlen, p, len, buf ) ) != 0 )
1000	{
1001	if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
1002	return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
1003
1004	return( ret );
1005	}
1006
1007	decrypted = 1;
1008	}
1009	else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
1010	{
1011	if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
1012	MBEDTLS_PKCS12_PBE_DECRYPT,
1013	pwd, pwdlen,
1014	p, len, buf ) ) != 0 )
1015	{
1016	return( ret );
1017	}
1018
1019	// Best guess for password mismatch when using RC4. If first tag is
1020	// not MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE
1021	//
1022	if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) )
1023	return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
1024
1025	decrypted = 1;
1026	}
1027	else
1028	#endif /* MBEDTLS_PKCS12_C */
1029	#if defined(MBEDTLS_PKCS5_C)
1030	if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
1031	{
1032	if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
1033	p, len, buf ) ) != 0 )
1034	{
1035	if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
1036	return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
1037
1038	return( ret );
1039	}
1040
1041	decrypted = 1;
1042	}
1043	else
1044	#endif /* MBEDTLS_PKCS5_C */
1045	{
1046	((void) pwd);
1047	}
1048
1049	if( decrypted == 0 )
1050	return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
1051
1052	return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
1053	}
1054	#endif /* MBEDTLS_PKCS12_C \|\| MBEDTLS_PKCS5_C */
1055
1056	/*
1057	* Parse a private key
1058	*/
1059	int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
1060	const unsigned char *key, size_t keylen,
1061	const unsigned char *pwd, size_t pwdlen )
1062	{
1063	int ret;
1064	const mbedtls_pk_info_t *pk_info;
1065
1066	#if defined(MBEDTLS_PEM_PARSE_C)
1067	size_t len;
1068	mbedtls_pem_context pem;
1069
1070	mbedtls_pem_init( &pem );
1071
1072	#if defined(MBEDTLS_RSA_C)
1073	/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
1074	if( keylen == 0 \|\| key[keylen - 1] != '\0' )
1075	ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
1076	else
1077	ret = mbedtls_pem_read_buffer( &pem,
1078	"-----BEGIN RSA PRIVATE KEY-----",
1079	"-----END RSA PRIVATE KEY-----",
1080	key, pwd, pwdlen, &len );
1081
1082	if( ret == 0 )
1083	{
1084	if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
1085	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
1086
1087	if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 \|\|
1088	( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
1089	pem.buf, pem.buflen ) ) != 0 )
1090	{
1091	mbedtls_pk_free( pk );
1092	}
1093
1094	mbedtls_pem_free( &pem );
1095	return( ret );
1096	}
1097	else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
1098	return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
1099	else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
1100	return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
1101	else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1102	return( ret );
1103	#endif /* MBEDTLS_RSA_C */
1104
1105	#if defined(MBEDTLS_ECP_C)
1106	/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
1107	if( keylen == 0 \|\| key[keylen - 1] != '\0' )
1108	ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
1109	else
1110	ret = mbedtls_pem_read_buffer( &pem,
1111	"-----BEGIN EC PRIVATE KEY-----",
1112	"-----END EC PRIVATE KEY-----",
1113	key, pwd, pwdlen, &len );
1114	if( ret == 0 )
1115	{
1116	if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
1117	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
1118
1119	if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 \|\|
1120	( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
1121	pem.buf, pem.buflen ) ) != 0 )
1122	{
1123	mbedtls_pk_free( pk );
1124	}
1125
1126	mbedtls_pem_free( &pem );
1127	return( ret );
1128	}
1129	else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
1130	return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
1131	else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
1132	return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
1133	else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1134	return( ret );
1135	#endif /* MBEDTLS_ECP_C */
1136
1137	/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
1138	if( keylen == 0 \|\| key[keylen - 1] != '\0' )
1139	ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
1140	else
1141	ret = mbedtls_pem_read_buffer( &pem,
1142	"-----BEGIN PRIVATE KEY-----",
1143	"-----END PRIVATE KEY-----",
1144	key, NULL, 0, &len );
1145	if( ret == 0 )
1146	{
1147	if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
1148	pem.buf, pem.buflen ) ) != 0 )
1149	{
1150	mbedtls_pk_free( pk );
1151	}
1152
1153	mbedtls_pem_free( &pem );
1154	return( ret );
1155	}
1156	else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1157	return( ret );
1158
1159	#if defined(MBEDTLS_PKCS12_C) \|\| defined(MBEDTLS_PKCS5_C)
1160	/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
1161	if( keylen == 0 \|\| key[keylen - 1] != '\0' )
1162	ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
1163	else
1164	ret = mbedtls_pem_read_buffer( &pem,
1165	"-----BEGIN ENCRYPTED PRIVATE KEY-----",
1166	"-----END ENCRYPTED PRIVATE KEY-----",
1167	key, NULL, 0, &len );
1168	if( ret == 0 )
1169	{
1170	if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
1171	pem.buf, pem.buflen,
1172	pwd, pwdlen ) ) != 0 )
1173	{
1174	mbedtls_pk_free( pk );
1175	}
1176
1177	mbedtls_pem_free( &pem );
1178	return( ret );
1179	}
1180	else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1181	return( ret );
1182	#endif /* MBEDTLS_PKCS12_C \|\| MBEDTLS_PKCS5_C */
1183	#else
1184	((void) ret);
1185	((void) pwd);
1186	((void) pwdlen);
1187	#endif /* MBEDTLS_PEM_PARSE_C */
1188
1189	/*
1190	* At this point we only know it's not a PEM formatted key. Could be any
1191	* of the known DER encoded private key formats
1192	*
1193	* We try the different DER format parsers to see if one passes without
1194	* error
1195	*/
1196	#if defined(MBEDTLS_PKCS12_C) \|\| defined(MBEDTLS_PKCS5_C)
1197	if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
1198	pwd, pwdlen ) ) == 0 )
1199	{
1200	return( 0 );
1201	}
1202
1203	mbedtls_pk_free( pk );
1204
1205	if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
1206	{
1207	return( ret );
1208	}
1209	#endif /* MBEDTLS_PKCS12_C \|\| MBEDTLS_PKCS5_C */
1210
1211	if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
1212	return( 0 );
1213
1214	mbedtls_pk_free( pk );
1215
1216	#if defined(MBEDTLS_RSA_C)
1217	if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
1218	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
1219
1220	if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 \|\|
1221	( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), key, keylen ) ) == 0 )
1222	{
1223	return( 0 );
1224	}
1225
1226	mbedtls_pk_free( pk );
1227	#endif /* MBEDTLS_RSA_C */
1228
1229	#if defined(MBEDTLS_ECP_C)
1230	if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
1231	return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
1232
1233	if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 \|\|
1234	( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), key, keylen ) ) == 0 )
1235	{
1236	return( 0 );
1237	}
1238
1239	mbedtls_pk_free( pk );
1240	#endif /* MBEDTLS_ECP_C */
1241
1242	return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
1243	}
1244
1245	/*
1246	* Parse a public key
1247	*/
1248	int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
1249	const unsigned char *key, size_t keylen )
1250	{
1251	int ret;
1252	unsigned char *p;
1253	#if defined(MBEDTLS_PEM_PARSE_C)
1254	size_t len;
1255	mbedtls_pem_context pem;
1256
1257	mbedtls_pem_init( &pem );
1258
1259	/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
1260	if( keylen == 0 \|\| key[keylen - 1] != '\0' )
1261	ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
1262	else
1263	ret = mbedtls_pem_read_buffer( &pem,
1264	"-----BEGIN PUBLIC KEY-----",
1265	"-----END PUBLIC KEY-----",
1266	key, NULL, 0, &len );
1267
1268	if( ret == 0 )
1269	{
1270	/*
1271	* Was PEM encoded
1272	*/
1273	key = pem.buf;
1274	keylen = pem.buflen;
1275	}
1276	else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1277	{
1278	mbedtls_pem_free( &pem );
1279	return( ret );
1280	}
1281	#endif /* MBEDTLS_PEM_PARSE_C */
1282	p = (unsigned char *) key;
1283
1284	ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
1285
1286	#if defined(MBEDTLS_PEM_PARSE_C)
1287	mbedtls_pem_free( &pem );
1288	#endif
1289
1290	return( ret );
1291	}
1292
1293	#endif /* MBEDTLS_PK_PARSE_C */

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source: ps/trunk/build/premake/premake5/contrib/mbedtls/library/pkparse.c

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