| /* |
| * Copyright 2013-2022 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* |
| * DH low level APIs are deprecated for public use, but still ok for |
| * internal use. |
| */ |
| #include "internal/deprecated.h" |
| |
| #include "internal/e_os.h" |
| #include <string.h> |
| #include <openssl/core_names.h> |
| #include <openssl/dh.h> |
| #include <openssl/evp.h> |
| #include <openssl/asn1.h> |
| #include <openssl/kdf.h> |
| #include "internal/provider.h" |
| #include "crypto/dh.h" |
| |
| /* Key derivation function from X9.63/SECG */ |
| int ossl_dh_kdf_X9_42_asn1(unsigned char *out, size_t outlen, |
| const unsigned char *Z, size_t Zlen, |
| const char *cek_alg, |
| const unsigned char *ukm, size_t ukmlen, |
| const EVP_MD *md, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| int ret = 0; |
| EVP_KDF_CTX *kctx = NULL; |
| EVP_KDF *kdf = NULL; |
| OSSL_PARAM params[5], *p = params; |
| const char *mdname = EVP_MD_get0_name(md); |
| |
| kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X942KDF_ASN1, propq); |
| if (kdf == NULL) |
| return 0; |
| kctx = EVP_KDF_CTX_new(kdf); |
| if (kctx == NULL) |
| goto err; |
| |
| *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, |
| (char *)mdname, 0); |
| *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, |
| (unsigned char *)Z, Zlen); |
| if (ukm != NULL) |
| *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM, |
| (unsigned char *)ukm, ukmlen); |
| *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG, |
| (char *)cek_alg, 0); |
| *p = OSSL_PARAM_construct_end(); |
| ret = EVP_KDF_derive(kctx, out, outlen, params) > 0; |
| err: |
| EVP_KDF_CTX_free(kctx); |
| EVP_KDF_free(kdf); |
| return ret; |
| } |
| |
| #if !defined(FIPS_MODULE) |
| int DH_KDF_X9_42(unsigned char *out, size_t outlen, |
| const unsigned char *Z, size_t Zlen, |
| ASN1_OBJECT *key_oid, |
| const unsigned char *ukm, size_t ukmlen, const EVP_MD *md) |
| { |
| char key_alg[OSSL_MAX_NAME_SIZE]; |
| const OSSL_PROVIDER *prov = EVP_MD_get0_provider(md); |
| OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov); |
| |
| if (OBJ_obj2txt(key_alg, sizeof(key_alg), key_oid, 0) <= 0) |
| return 0; |
| |
| return ossl_dh_kdf_X9_42_asn1(out, outlen, Z, Zlen, key_alg, |
| ukm, ukmlen, md, libctx, NULL); |
| } |
| #endif /* !defined(FIPS_MODULE) */ |