| 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 */
|
|---|
| 28 | int 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;
|
|---|
| 59 | err:
|
|---|
| 60 | EVP_KDF_CTX_free(kctx);
|
|---|
| 61 | EVP_KDF_free(kdf);
|
|---|
| 62 | return ret;
|
|---|
| 63 | }
|
|---|
| 64 |
|
|---|
| 65 | #if !defined(FIPS_MODULE)
|
|---|
| 66 | int 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) */
|
|---|
