Line data Source code
1 : /**
2 : * \file pk_internal.h
3 : *
4 : * \brief Public Key abstraction layer: internal (i.e. library only) functions
5 : * and definitions.
6 : */
7 : /*
8 : * Copyright The Mbed TLS Contributors
9 : * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
10 : */
11 : #ifndef MBEDTLS_PK_INTERNAL_H
12 : #define MBEDTLS_PK_INTERNAL_H
13 :
14 : #include "mbedtls/pk.h"
15 :
16 : #if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
17 : #include "mbedtls/ecp.h"
18 : #endif
19 :
20 : #if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
21 : #include "psa/crypto.h"
22 :
23 : #include "psa_util_internal.h"
24 : #define PSA_PK_TO_MBEDTLS_ERR(status) psa_pk_status_to_mbedtls(status)
25 : #define PSA_PK_RSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \
26 : psa_to_pk_rsa_errors, \
27 : psa_pk_status_to_mbedtls)
28 : #define PSA_PK_ECDSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \
29 : psa_to_pk_ecdsa_errors, \
30 : psa_pk_status_to_mbedtls)
31 : #endif /* MBEDTLS_PSA_CRYPTO_CLIENT */
32 :
33 : /* Headers/footers for PEM files */
34 : #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----"
35 : #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----"
36 : #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----"
37 : #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----"
38 : #define PEM_BEGIN_PUBLIC_KEY_RSA "-----BEGIN RSA PUBLIC KEY-----"
39 : #define PEM_END_PUBLIC_KEY_RSA "-----END RSA PUBLIC KEY-----"
40 : #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----"
41 : #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----"
42 : #define PEM_BEGIN_PRIVATE_KEY_PKCS8 "-----BEGIN PRIVATE KEY-----"
43 : #define PEM_END_PRIVATE_KEY_PKCS8 "-----END PRIVATE KEY-----"
44 : #define PEM_BEGIN_ENCRYPTED_PRIVATE_KEY_PKCS8 "-----BEGIN ENCRYPTED PRIVATE KEY-----"
45 : #define PEM_END_ENCRYPTED_PRIVATE_KEY_PKCS8 "-----END ENCRYPTED PRIVATE KEY-----"
46 :
47 : #if defined(MBEDTLS_PK_HAVE_ECC_KEYS) && !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
48 : /**
49 : * Public function mbedtls_pk_ec() can be used to get direct access to the
50 : * wrapped ecp_keypair structure pointed to the pk_ctx. However this is not
51 : * ideal because it bypasses the PK module on the control of its internal
52 : * structure (pk_context) fields.
53 : * For backward compatibility we keep mbedtls_pk_ec() when ECP_C is defined, but
54 : * we provide 2 very similar functions when only ECP_LIGHT is enabled and not
55 : * ECP_C.
56 : * These variants embed the "ro" or "rw" keywords in their name to make the
57 : * usage of the returned pointer explicit. Of course the returned value is
58 : * const or non-const accordingly.
59 : */
60 15103 : static inline const mbedtls_ecp_keypair *mbedtls_pk_ec_ro(const mbedtls_pk_context pk)
61 : {
62 15103 : switch (mbedtls_pk_get_type(&pk)) {
63 15103 : case MBEDTLS_PK_ECKEY:
64 : case MBEDTLS_PK_ECKEY_DH:
65 : case MBEDTLS_PK_ECDSA:
66 15103 : return (const mbedtls_ecp_keypair *) (pk).MBEDTLS_PRIVATE(pk_ctx);
67 0 : default:
68 0 : return NULL;
69 : }
70 : }
71 :
72 11795 : static inline mbedtls_ecp_keypair *mbedtls_pk_ec_rw(const mbedtls_pk_context pk)
73 : {
74 11795 : switch (mbedtls_pk_get_type(&pk)) {
75 11795 : case MBEDTLS_PK_ECKEY:
76 : case MBEDTLS_PK_ECKEY_DH:
77 : case MBEDTLS_PK_ECDSA:
78 11795 : return (mbedtls_ecp_keypair *) (pk).MBEDTLS_PRIVATE(pk_ctx);
79 0 : default:
80 0 : return NULL;
81 : }
82 : }
83 : #endif /* MBEDTLS_PK_HAVE_ECC_KEYS && !MBEDTLS_PK_USE_PSA_EC_DATA */
84 :
85 : #if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
86 3453 : static inline mbedtls_ecp_group_id mbedtls_pk_get_ec_group_id(const mbedtls_pk_context *pk)
87 : {
88 : mbedtls_ecp_group_id id;
89 :
90 : #if defined(MBEDTLS_USE_PSA_CRYPTO)
91 : if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
92 : psa_key_attributes_t opaque_attrs = PSA_KEY_ATTRIBUTES_INIT;
93 : psa_key_type_t opaque_key_type;
94 : psa_ecc_family_t curve;
95 :
96 : if (psa_get_key_attributes(pk->priv_id, &opaque_attrs) != PSA_SUCCESS) {
97 : return MBEDTLS_ECP_DP_NONE;
98 : }
99 : opaque_key_type = psa_get_key_type(&opaque_attrs);
100 : curve = PSA_KEY_TYPE_ECC_GET_FAMILY(opaque_key_type);
101 : id = mbedtls_ecc_group_from_psa(curve, psa_get_key_bits(&opaque_attrs));
102 : psa_reset_key_attributes(&opaque_attrs);
103 : } else
104 : #endif /* MBEDTLS_USE_PSA_CRYPTO */
105 : {
106 : #if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
107 : id = mbedtls_ecc_group_from_psa(pk->ec_family, pk->ec_bits);
108 : #else /* MBEDTLS_PK_USE_PSA_EC_DATA */
109 3453 : id = mbedtls_pk_ec_ro(*pk)->grp.id;
110 : #endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
111 : }
112 :
113 3453 : return id;
114 : }
115 :
116 : /* Helper for Montgomery curves */
117 : #if defined(MBEDTLS_ECP_HAVE_CURVE25519) || defined(MBEDTLS_ECP_HAVE_CURVE448)
118 : #define MBEDTLS_PK_HAVE_RFC8410_CURVES
119 : #endif /* MBEDTLS_ECP_HAVE_CURVE25519 || MBEDTLS_ECP_DP_CURVE448 */
120 :
121 : #define MBEDTLS_PK_IS_RFC8410_GROUP_ID(id) \
122 : ((id == MBEDTLS_ECP_DP_CURVE25519) || (id == MBEDTLS_ECP_DP_CURVE448))
123 :
124 0 : static inline int mbedtls_pk_is_rfc8410(const mbedtls_pk_context *pk)
125 : {
126 0 : mbedtls_ecp_group_id id = mbedtls_pk_get_ec_group_id(pk);
127 :
128 0 : return MBEDTLS_PK_IS_RFC8410_GROUP_ID(id);
129 : }
130 :
131 : /*
132 : * Set the group used by this key.
133 : *
134 : * [in/out] pk: in: must have been pk_setup() to an ECC type
135 : * out: will have group (curve) information set
136 : * [in] grp_in: a supported group ID (not NONE)
137 : */
138 : int mbedtls_pk_ecc_set_group(mbedtls_pk_context *pk, mbedtls_ecp_group_id grp_id);
139 :
140 : /*
141 : * Set the private key material
142 : *
143 : * [in/out] pk: in: must have the group set already, see mbedtls_pk_ecc_set_group().
144 : * out: will have the private key set.
145 : * [in] key, key_len: the raw private key (no ASN.1 wrapping).
146 : */
147 : int mbedtls_pk_ecc_set_key(mbedtls_pk_context *pk, unsigned char *key, size_t key_len);
148 :
149 : /*
150 : * Set the public key.
151 : *
152 : * [in/out] pk: in: must have its group set, see mbedtls_pk_ecc_set_group().
153 : * out: will have the public key set.
154 : * [in] pub, pub_len: the raw public key (an ECPoint).
155 : *
156 : * Return:
157 : * - 0 on success;
158 : * - MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the format is potentially valid
159 : * but not supported;
160 : * - another error code otherwise.
161 : */
162 : int mbedtls_pk_ecc_set_pubkey(mbedtls_pk_context *pk, const unsigned char *pub, size_t pub_len);
163 :
164 : /*
165 : * Derive a public key from its private counterpart.
166 : * Computationally intensive, only use when public key is not available.
167 : *
168 : * [in/out] pk: in: must have the private key set, see mbedtls_pk_ecc_set_key().
169 : * out: will have the public key set.
170 : * [in] prv, prv_len: the raw private key (see note below).
171 : * [in] f_rng, p_rng: RNG function and context.
172 : *
173 : * Note: the private key information is always available from pk,
174 : * however for convenience the serialized version is also passed,
175 : * as it's available at each calling site, and useful in some configs
176 : * (as otherwise we would have to re-serialize it from the pk context).
177 : *
178 : * There are three implementations of this function:
179 : * 1. MBEDTLS_PK_USE_PSA_EC_DATA,
180 : * 2. MBEDTLS_USE_PSA_CRYPTO but not MBEDTLS_PK_USE_PSA_EC_DATA,
181 : * 3. not MBEDTLS_USE_PSA_CRYPTO.
182 : */
183 : int mbedtls_pk_ecc_set_pubkey_from_prv(mbedtls_pk_context *pk,
184 : const unsigned char *prv, size_t prv_len,
185 : int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
186 : #endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
187 :
188 : /* Helper for (deterministic) ECDSA */
189 : #if defined(MBEDTLS_ECDSA_DETERMINISTIC)
190 : #define MBEDTLS_PK_PSA_ALG_ECDSA_MAYBE_DET PSA_ALG_DETERMINISTIC_ECDSA
191 : #else
192 : #define MBEDTLS_PK_PSA_ALG_ECDSA_MAYBE_DET PSA_ALG_ECDSA
193 : #endif
194 :
195 : #if defined(MBEDTLS_TEST_HOOKS)
196 : MBEDTLS_STATIC_TESTABLE int mbedtls_pk_parse_key_pkcs8_encrypted_der(
197 : mbedtls_pk_context *pk,
198 : unsigned char *key, size_t keylen,
199 : const unsigned char *pwd, size_t pwdlen,
200 : int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
201 : #endif
202 :
203 : #if defined(MBEDTLS_FS_IO)
204 : int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n);
205 : #endif
206 :
207 : #endif /* MBEDTLS_PK_INTERNAL_H */
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