1/* 2 * Copyright 2013-2022 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 * DH low level APIs are deprecated for public use, but still ok for 12 * internal use. 13 */ 14#include "internal/deprecated.h" 15 16#include "e_os.h" 17#include "e_os.h" 18#include <string.h> 19#include <openssl/core_names.h> 20#include <openssl/dh.h> 21#include <openssl/evp.h> 22#include <openssl/asn1.h> 23#include <openssl/kdf.h> 24#include "internal/provider.h" 25#include "crypto/dh.h" 26 27/* Key derivation function from X9.63/SECG */ 28int ossl_dh_kdf_X9_42_asn1(unsigned char *out, size_t outlen, 29 const unsigned char *Z, size_t Zlen, 30 const char *cek_alg, 31 const unsigned char *ukm, size_t ukmlen, 32 const EVP_MD *md, 33 OSSL_LIB_CTX *libctx, const char *propq) 34{ 35 int ret = 0; 36 EVP_KDF_CTX *kctx = NULL; 37 EVP_KDF *kdf = NULL; 38 OSSL_PARAM params[5], *p = params; 39 const char *mdname = EVP_MD_get0_name(md); 40 41 kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X942KDF_ASN1, propq); 42 if (kdf == NULL) 43 return 0; 44 kctx = EVP_KDF_CTX_new(kdf); 45 if (kctx == NULL) 46 goto err; 47 48 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, 49 (char *)mdname, 0); 50 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, 51 (unsigned char *)Z, Zlen); 52 if (ukm != NULL) 53 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM, 54 (unsigned char *)ukm, ukmlen); 55 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG, 56 (char *)cek_alg, 0); 57 *p = OSSL_PARAM_construct_end(); 58 ret = EVP_KDF_derive(kctx, out, outlen, params) > 0; 59err: 60 EVP_KDF_CTX_free(kctx); 61 EVP_KDF_free(kdf); 62 return ret; 63} 64 65#if !defined(FIPS_MODULE) 66int DH_KDF_X9_42(unsigned char *out, size_t outlen, 67 const unsigned char *Z, size_t Zlen, 68 ASN1_OBJECT *key_oid, 69 const unsigned char *ukm, size_t ukmlen, const EVP_MD *md) 70{ 71 char key_alg[OSSL_MAX_NAME_SIZE]; 72 const OSSL_PROVIDER *prov = EVP_MD_get0_provider(md); 73 OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov); 74 75 if (OBJ_obj2txt(key_alg, sizeof(key_alg), key_oid, 0) <= 0) 76 return 0; 77 78 return ossl_dh_kdf_X9_42_asn1(out, outlen, Z, Zlen, key_alg, 79 ukm, ukmlen, md, libctx, NULL); 80} 81#endif /* !defined(FIPS_MODULE) */ 82