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 */
28static 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 */
51ASN1_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
57ASN1_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
71ASN1_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 */
77static 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
87ASN1_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
94IMPLEMENT_ASN1_FUNCTIONS(RSA_PSS_PARAMS)
95IMPLEMENT_ASN1_DUP_FUNCTION(RSA_PSS_PARAMS)
96
97/* Free up maskHash */
98static 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
108ASN1_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
114IMPLEMENT_ASN1_FUNCTIONS(RSA_OAEP_PARAMS)
115
116IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(RSA, RSAPrivateKey, RSAPrivateKey)
117
118IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(RSA, RSAPublicKey, RSAPublicKey)
119
120RSA *RSAPublicKey_dup(const RSA *rsa)
121{
122    return ASN1_item_dup(ASN1_ITEM_rptr(RSAPublicKey), rsa);
123}
124
125RSA *RSAPrivateKey_dup(const RSA *rsa)
126{
127    return ASN1_item_dup(ASN1_ITEM_rptr(RSAPrivateKey), rsa);
128}
129