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 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 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 65 static int md_is_a(const void *md, const char *name) 66 { 67 return EVP_MD_is_a(md, name); 68 } 69 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 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 81 const char *ossl_rsa_mgf_nid2name(int mgf) 82 { 83 if (mgf == NID_mgf1) 84 return SN_mgf1; 85 return NULL; 86 } 87