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      1 /*
      2  * Copyright 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 #include "crypto/types.h"
     11 
     12 #ifndef OPENSSL_NO_EC
     13 
     14 /* RFC 9180 Labels used for Extract and Expand operations */
     15 
     16 /* ASCII: "eae_prk", in hex for EBCDIC compatibility */
     17 #define OSSL_DHKEM_LABEL_EAE_PRK "\x65\x61\x65\x5F\x70\x72\x6B"
     18 /* ASCII: "shared_secret", in hex for EBCDIC compatibility */
     19 #define OSSL_DHKEM_LABEL_SHARED_SECRET "\x73\x68\x61\x72\x65\x64\x5F\x73\x65\x63\x72\x65\x74"
     20 /* ASCII: "dkp_prk", in hex for EBCDIC compatibility */
     21 #define OSSL_DHKEM_LABEL_DKP_PRK "\x64\x6B\x70\x5F\x70\x72\x6B"
     22 /* ASCII: "candidate", in hex for EBCDIC compatibility */
     23 #define OSSL_DHKEM_LABEL_CANDIDATE "\x63\x61\x6E\x64\x69\x64\x61\x74\x65"
     24 /* ASCII: "sk", in hex for EBCDIC compatibility */
     25 #define OSSL_DHKEM_LABEL_SK "\x73\x6B"
     26 
     27 int ossl_ecx_dhkem_derive_private(ECX_KEY *ecx, unsigned char *privout,
     28     const unsigned char *ikm, size_t ikmlen);
     29 int ossl_ec_dhkem_derive_private(EC_KEY *ec, BIGNUM *privout,
     30     const unsigned char *ikm, size_t ikmlen);
     31 #endif
     32