| 1 | /*
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| 2 | * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * ECDH low level APIs are deprecated for public use, but still ok for
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| 12 | * internal use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include <string.h>
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| 17 | #include <openssl/core_names.h>
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| 18 | #include <openssl/ec.h>
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| 19 | #include <openssl/evp.h>
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| 20 | #include <openssl/kdf.h>
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| 21 | #include "ec_local.h"
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| 22 |
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| 23 | /* Key derivation function from X9.63/SECG */
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| 24 | int ossl_ecdh_kdf_X9_63(unsigned char *out, size_t outlen,
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| 25 | const unsigned char *Z, size_t Zlen,
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| 26 | const unsigned char *sinfo, size_t sinfolen,
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| 27 | const EVP_MD *md,
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| 28 | OSSL_LIB_CTX *libctx, const char *propq)
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| 29 | {
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| 30 | int ret = 0;
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| 31 | EVP_KDF_CTX *kctx = NULL;
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| 32 | OSSL_PARAM params[4], *p = params;
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| 33 | const char *mdname = EVP_MD_get0_name(md);
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| 34 | EVP_KDF *kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X963KDF, propq);
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| 35 |
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| 36 | if ((kctx = EVP_KDF_CTX_new(kdf)) != NULL) {
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| 37 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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| 38 | (char *)mdname, 0);
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| 39 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
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| 40 | (void *)Z, Zlen);
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| 41 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
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| 42 | (void *)sinfo, sinfolen);
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| 43 | *p = OSSL_PARAM_construct_end();
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| 44 |
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| 45 | ret = EVP_KDF_derive(kctx, out, outlen, params) > 0;
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| 46 | EVP_KDF_CTX_free(kctx);
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| 47 | }
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| 48 | EVP_KDF_free(kdf);
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| 49 | return ret;
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| 50 | }
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| 51 |
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| 52 | /*-
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| 53 | * The old name for ecdh_KDF_X9_63
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| 54 | * Retained for ABI compatibility
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| 55 | */
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| 56 | #ifndef OPENSSL_NO_DEPRECATED_3_0
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| 57 | int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
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| 58 | const unsigned char *Z, size_t Zlen,
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| 59 | const unsigned char *sinfo, size_t sinfolen,
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| 60 | const EVP_MD *md)
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| 61 | {
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| 62 | return ossl_ecdh_kdf_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md, NULL,
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| 63 | NULL);
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| 64 | }
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| 65 | #endif
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