xref: /openssl/crypto/rsa/rsa_asn1.c (revision 3c2bdd7d)
1 /*
2  * Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 /*
11  * RSA low level APIs are deprecated for public use, but still ok for
12  * internal use.
13  */
14 #include "internal/deprecated.h"
15 
16 #include <stdio.h>
17 #include "internal/cryptlib.h"
18 #include <openssl/bn.h>
19 #include <openssl/x509.h>
20 #include <openssl/asn1t.h>
21 #include "rsa_local.h"
22 
23 /*
24  * Override the default free and new methods,
25  * and calculate helper products for multi-prime
26  * RSA keys.
27  */
rsa_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)28 static int rsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
29                   void *exarg)
30 {
31     if (operation == ASN1_OP_NEW_PRE) {
32         *pval = (ASN1_VALUE *)RSA_new();
33         if (*pval != NULL)
34             return 2;
35         return 0;
36     } else if (operation == ASN1_OP_FREE_PRE) {
37         RSA_free((RSA *)*pval);
38         *pval = NULL;
39         return 2;
40     } else if (operation == ASN1_OP_D2I_POST) {
41         if (((RSA *)*pval)->version != RSA_ASN1_VERSION_MULTI) {
42             /* not a multi-prime key, skip */
43             return 1;
44         }
45         return (ossl_rsa_multip_calc_product((RSA *)*pval) == 1) ? 2 : 0;
46     }
47     return 1;
48 }
49 
50 /* Based on definitions in RFC 8017 appendix A.1.2 */
51 ASN1_SEQUENCE(RSA_PRIME_INFO) = {
52         ASN1_SIMPLE(RSA_PRIME_INFO, r, CBIGNUM),
53         ASN1_SIMPLE(RSA_PRIME_INFO, d, CBIGNUM),
54         ASN1_SIMPLE(RSA_PRIME_INFO, t, CBIGNUM),
55 } ASN1_SEQUENCE_END(RSA_PRIME_INFO)
56 
57 ASN1_SEQUENCE_cb(RSAPrivateKey, rsa_cb) = {
58         ASN1_EMBED(RSA, version, INT32),
59         ASN1_SIMPLE(RSA, n, BIGNUM),
60         ASN1_SIMPLE(RSA, e, BIGNUM),
61         ASN1_SIMPLE(RSA, d, CBIGNUM),
62         ASN1_SIMPLE(RSA, p, CBIGNUM),
63         ASN1_SIMPLE(RSA, q, CBIGNUM),
64         ASN1_SIMPLE(RSA, dmp1, CBIGNUM),
65         ASN1_SIMPLE(RSA, dmq1, CBIGNUM),
66         ASN1_SIMPLE(RSA, iqmp, CBIGNUM),
67         ASN1_SEQUENCE_OF_OPT(RSA, prime_infos, RSA_PRIME_INFO)
68 } ASN1_SEQUENCE_END_cb(RSA, RSAPrivateKey)
69 
70 
71 ASN1_SEQUENCE_cb(RSAPublicKey, rsa_cb) = {
72         ASN1_SIMPLE(RSA, n, BIGNUM),
73         ASN1_SIMPLE(RSA, e, BIGNUM),
74 } ASN1_SEQUENCE_END_cb(RSA, RSAPublicKey)
75 
76 /* Free up maskHash */
77 static int rsa_pss_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
78                       void *exarg)
79 {
80     if (operation == ASN1_OP_FREE_PRE) {
81         RSA_PSS_PARAMS *pss = (RSA_PSS_PARAMS *)*pval;
82         X509_ALGOR_free(pss->maskHash);
83     }
84     return 1;
85 }
86 
87 ASN1_SEQUENCE_cb(RSA_PSS_PARAMS, rsa_pss_cb) = {
88         ASN1_EXP_OPT(RSA_PSS_PARAMS, hashAlgorithm, X509_ALGOR,0),
89         ASN1_EXP_OPT(RSA_PSS_PARAMS, maskGenAlgorithm, X509_ALGOR,1),
90         ASN1_EXP_OPT(RSA_PSS_PARAMS, saltLength, ASN1_INTEGER,2),
91         ASN1_EXP_OPT(RSA_PSS_PARAMS, trailerField, ASN1_INTEGER,3)
92 } ASN1_SEQUENCE_END_cb(RSA_PSS_PARAMS, RSA_PSS_PARAMS)
93 
94 IMPLEMENT_ASN1_FUNCTIONS(RSA_PSS_PARAMS)
95 IMPLEMENT_ASN1_DUP_FUNCTION(RSA_PSS_PARAMS)
96 
97 /* Free up maskHash */
98 static int rsa_oaep_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
99                        void *exarg)
100 {
101     if (operation == ASN1_OP_FREE_PRE) {
102         RSA_OAEP_PARAMS *oaep = (RSA_OAEP_PARAMS *)*pval;
103         X509_ALGOR_free(oaep->maskHash);
104     }
105     return 1;
106 }
107 
108 ASN1_SEQUENCE_cb(RSA_OAEP_PARAMS, rsa_oaep_cb) = {
109         ASN1_EXP_OPT(RSA_OAEP_PARAMS, hashFunc, X509_ALGOR, 0),
110         ASN1_EXP_OPT(RSA_OAEP_PARAMS, maskGenFunc, X509_ALGOR, 1),
111         ASN1_EXP_OPT(RSA_OAEP_PARAMS, pSourceFunc, X509_ALGOR, 2),
112 } ASN1_SEQUENCE_END_cb(RSA_OAEP_PARAMS, RSA_OAEP_PARAMS)
113 
114 IMPLEMENT_ASN1_FUNCTIONS(RSA_OAEP_PARAMS)
115 
116 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(RSA, RSAPrivateKey, RSAPrivateKey)
117 
118 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(RSA, RSAPublicKey, RSAPublicKey)
119 
120 RSA *RSAPublicKey_dup(const RSA *rsa)
121 {
122     return ASN1_item_dup(ASN1_ITEM_rptr(RSAPublicKey), rsa);
123 }
124 
RSAPrivateKey_dup(const RSA * rsa)125 RSA *RSAPrivateKey_dup(const RSA *rsa)
126 {
127     return ASN1_item_dup(ASN1_ITEM_rptr(RSAPrivateKey), rsa);
128 }
129