Added support for different encryption schemes to private/public keys
[strongswan.git] / src / libstrongswan / credentials / keys / public_key.h
1 /*
2 * Copyright (C) 2007 Martin Willi
3 * Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 /**
17 * @defgroup public_key public_key
18 * @{ @ingroup keys
19 */
20
21 #ifndef PUBLIC_KEY_H_
22 #define PUBLIC_KEY_H_
23
24 typedef struct public_key_t public_key_t;
25 typedef enum key_type_t key_type_t;
26 typedef enum signature_scheme_t signature_scheme_t;
27 typedef enum encryption_scheme_t encryption_scheme_t;
28
29 #include <library.h>
30 #include <utils/identification.h>
31 #include <credentials/cred_encoding.h>
32
33 /**
34 * Type of a key pair, the used crypto system
35 */
36 enum key_type_t {
37 /** key type wildcard */
38 KEY_ANY = 0,
39 /** RSA crypto system as in PKCS#1 */
40 KEY_RSA = 1,
41 /** ECDSA as in ANSI X9.62 */
42 KEY_ECDSA = 2,
43 /** DSA */
44 KEY_DSA = 3,
45 /** ElGamal, ... */
46 };
47
48 /**
49 * Enum names for key_type_t
50 */
51 extern enum_name_t *key_type_names;
52
53 /**
54 * Signature scheme for signature creation
55 *
56 * EMSA-PKCS1 signatures are defined in PKCS#1 standard.
57 * A prepended ASN.1 encoded digestInfo field contains the
58 * OID of the used hash algorithm.
59 */
60 enum signature_scheme_t {
61 /** Unknown signature scheme */
62 SIGN_UNKNOWN,
63 /** EMSA-PKCS1_v1.5 signature over digest without digestInfo */
64 SIGN_RSA_EMSA_PKCS1_NULL,
65 /** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and MD5 */
66 SIGN_RSA_EMSA_PKCS1_MD5,
67 /** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-1 */
68 SIGN_RSA_EMSA_PKCS1_SHA1,
69 /** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-224 */
70 SIGN_RSA_EMSA_PKCS1_SHA224,
71 /** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-256 */
72 SIGN_RSA_EMSA_PKCS1_SHA256,
73 /** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-384 */
74 SIGN_RSA_EMSA_PKCS1_SHA384,
75 /** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-512 */
76 SIGN_RSA_EMSA_PKCS1_SHA512,
77 /** ECDSA with SHA-1 using DER encoding as in RFC 3279 */
78 SIGN_ECDSA_WITH_SHA1_DER,
79 /** ECDSA with SHA-256 using DER encoding as in RFC 3279 */
80 SIGN_ECDSA_WITH_SHA256_DER,
81 /** ECDSA with SHA-384 using DER encoding as in RFC 3279 */
82 SIGN_ECDSA_WITH_SHA384_DER,
83 /** ECDSA with SHA-1 using DER encoding as in RFC 3279 */
84 SIGN_ECDSA_WITH_SHA512_DER,
85 /** ECDSA over precomputed digest, signature as in RFC 4754 */
86 SIGN_ECDSA_WITH_NULL,
87 /** ECDSA on the P-256 curve with SHA-256 as in RFC 4754 */
88 SIGN_ECDSA_256,
89 /** ECDSA on the P-384 curve with SHA-384 as in RFC 4754 */
90 SIGN_ECDSA_384,
91 /** ECDSA on the P-521 curve with SHA-512 as in RFC 4754 */
92 SIGN_ECDSA_521,
93 };
94
95 /**
96 * Enum names for signature_scheme_t
97 */
98 extern enum_name_t *signature_scheme_names;
99
100 /**
101 * Encryption scheme for public key data encryption.
102 */
103 enum encryption_scheme_t {
104 /** Unknown encryption scheme */
105 ENCRYPT_UNKNOWN,
106 /** RSAES-PKCS1-v1_5 as in PKCS#1 */
107 ENCRYPT_RSA_PKCS1,
108 /** RSAES-OAEP as in PKCS#1, using SHA1 as hash, no label */
109 ENCRYPT_RSA_OAEP_SHA1,
110 /** RSAES-OAEP as in PKCS#1, using SHA-224 as hash, no label */
111 ENCRYPT_RSA_OAEP_SHA224,
112 /** RSAES-OAEP as in PKCS#1, using SHA-256 as hash, no label */
113 ENCRYPT_RSA_OAEP_SHA256,
114 /** RSAES-OAEP as in PKCS#1, using SHA-384 as hash, no label */
115 ENCRYPT_RSA_OAEP_SHA384,
116 /** RSAES-OAEP as in PKCS#1, using SHA-512 as hash, no label */
117 ENCRYPT_RSA_OAEP_SHA512,
118 };
119
120 /**
121 * Enum names for encryption_scheme_t
122 */
123 extern enum_name_t *encryption_scheme_names;
124
125 /**
126 * Abstract interface of a public key.
127 */
128 struct public_key_t {
129
130 /**
131 * Get the key type.
132 *
133 * @return type of the key
134 */
135 key_type_t (*get_type)(public_key_t *this);
136
137 /**
138 * Verifies a signature against a chunk of data.
139 *
140 * @param scheme signature scheme to use for verification, may be default
141 * @param data data to check signature against
142 * @param signature signature to check
143 * @return TRUE if signature matches
144 */
145 bool (*verify)(public_key_t *this, signature_scheme_t scheme,
146 chunk_t data, chunk_t signature);
147
148 /**
149 * Encrypt a chunk of data.
150 *
151 * @param scheme encryption scheme to use
152 * @param plain chunk containing plaintext data
153 * @param crypto where to allocate encrypted data
154 * @return TRUE if data successfully encrypted
155 */
156 bool (*encrypt)(public_key_t *this, encryption_scheme_t scheme,
157 chunk_t plain, chunk_t *crypto);
158
159 /**
160 * Check if two public keys are equal.
161 *
162 * @param other other public key
163 * @return TRUE, if equality
164 */
165 bool (*equals)(public_key_t *this, public_key_t *other);
166
167 /**
168 * Get the strength of the key in bytes.
169 *
170 * @return strength of the key in bytes
171 */
172 size_t (*get_keysize) (public_key_t *this);
173
174 /**
175 * Get the fingerprint of the key.
176 *
177 * @param type type of fingerprint, one of KEYID_*
178 * @param fp fingerprint, points to internal data
179 * @return TRUE if fingerprint type supported
180 */
181 bool (*get_fingerprint)(public_key_t *this, cred_encoding_type_t type,
182 chunk_t *fp);
183
184 /**
185 * Check if a key has a given fingerprint of any kind.
186 *
187 * @param fp fingerprint to check
188 * @return TRUE if key has given fingerprint
189 */
190 bool (*has_fingerprint)(public_key_t *this, chunk_t fp);
191
192 /**
193 * Get the key in an encoded form as a chunk.
194 *
195 * @param type type of the encoding, one of PRIVKEY_*
196 * @param encoding encoding of the key, allocated
197 * @return TRUE if encoding supported
198 */
199 bool (*get_encoding)(public_key_t *this, cred_encoding_type_t type,
200 chunk_t *encoding);
201
202 /**
203 * Increase the refcount of the key.
204 *
205 * @return this with an increased refcount
206 */
207 public_key_t* (*get_ref)(public_key_t *this);
208
209 /**
210 * Destroy a public_key instance.
211 */
212 void (*destroy)(public_key_t *this);
213 };
214
215 /**
216 * Generic public key equals() implementation, usable by implementors.
217 *
218 * @param this first key to compare
219 * @param other second key to compare
220 * @return TRUE if this is equal to other
221 */
222 bool public_key_equals(public_key_t *this, public_key_t *other);
223
224 /**
225 * Generic public key has_fingerprint() implementation, usable by implementors.
226 *
227 * @param this key to check fingerprint
228 * @param fingerprint fingerprint to check
229 * @return TRUE if key has given fingerprint
230 */
231 bool public_key_has_fingerprint(public_key_t *this, chunk_t fingerprint);
232
233 /**
234 * Conversion of ASN.1 signature or hash OID to signature scheme.
235 *
236 * @param oid ASN.1 OID
237 * @return signature_scheme, SIGN_UNKNOWN if OID is unsupported
238 */
239 signature_scheme_t signature_scheme_from_oid(int oid);
240
241 #endif /** PUBLIC_KEY_H_ @}*/