1 /*
2 * Copyright 2020 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 #include <openssl/core.h>
11 #include <openssl/core_names.h>
12 #include <openssl/evp.h>
13 #include <openssl/obj_mac.h>
14 #include "internal/nelem.h"
15 #include "crypto/rsa.h"
16
meth2nid(const void * meth,int (* meth_is_a)(const void * meth,const char * name),const OSSL_ITEM * items,size_t items_n)17 static int meth2nid(const void *meth,
18 int (*meth_is_a)(const void *meth, const char *name),
19 const OSSL_ITEM *items, size_t items_n)
20 {
21 size_t i;
22
23 if (meth != NULL)
24 for (i = 0; i < items_n; i++)
25 if (meth_is_a(meth, items[i].ptr))
26 return (int)items[i].id;
27 return NID_undef;
28 }
29
nid2name(int meth,const OSSL_ITEM * items,size_t items_n)30 static const char *nid2name(int meth, const OSSL_ITEM *items, size_t items_n)
31 {
32 size_t i;
33
34 for (i = 0; i < items_n; i++)
35 if (meth == (int)items[i].id)
36 return items[i].ptr;
37 return NULL;
38 }
39
40 /*
41 * The list of permitted hash functions are taken from
42 * https://tools.ietf.org/html/rfc8017#appendix-A.2.1:
43 *
44 * OAEP-PSSDigestAlgorithms ALGORITHM-IDENTIFIER ::= {
45 * { OID id-sha1 PARAMETERS NULL }|
46 * { OID id-sha224 PARAMETERS NULL }|
47 * { OID id-sha256 PARAMETERS NULL }|
48 * { OID id-sha384 PARAMETERS NULL }|
49 * { OID id-sha512 PARAMETERS NULL }|
50 * { OID id-sha512-224 PARAMETERS NULL }|
51 * { OID id-sha512-256 PARAMETERS NULL },
52 * ... -- Allows for future expansion --
53 * }
54 */
55 static const OSSL_ITEM oaeppss_name_nid_map[] = {
56 { NID_sha1, OSSL_DIGEST_NAME_SHA1 },
57 { NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
58 { NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
59 { NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
60 { NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
61 { NID_sha512_224, OSSL_DIGEST_NAME_SHA2_512_224 },
62 { NID_sha512_256, OSSL_DIGEST_NAME_SHA2_512_256 },
63 };
64
md_is_a(const void * md,const char * name)65 static int md_is_a(const void *md, const char *name)
66 {
67 return EVP_MD_is_a(md, name);
68 }
69
ossl_rsa_oaeppss_md2nid(const EVP_MD * md)70 int ossl_rsa_oaeppss_md2nid(const EVP_MD *md)
71 {
72 return meth2nid(md, md_is_a,
73 oaeppss_name_nid_map, OSSL_NELEM(oaeppss_name_nid_map));
74 }
75
ossl_rsa_oaeppss_nid2name(int md)76 const char *ossl_rsa_oaeppss_nid2name(int md)
77 {
78 return nid2name(md, oaeppss_name_nid_map, OSSL_NELEM(oaeppss_name_nid_map));
79 }
80
ossl_rsa_mgf_nid2name(int mgf)81 const char *ossl_rsa_mgf_nid2name(int mgf)
82 {
83 if (mgf == NID_mgf1)
84 return SN_mgf1;
85 return NULL;
86 }
87