


#include "internal/deprecated.h"

#include <string.h>
#include <openssl/core_names.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include "ec_local.h"


int ossl_ecdh_kdf_X9_63(unsigned char *out, size_t outlen,
                        const unsigned char *Z, size_t Zlen,
                        const unsigned char *sinfo, size_t sinfolen,
                        const EVP_MD *md,
                        OSSL_LIB_CTX *libctx, const char *propq)
{
    int ret = 0;
    EVP_KDF_CTX *kctx = NULL;
    OSSL_PARAM params[4], *p = params;
    const char *mdname = EVP_MD_get0_name(md);
    EVP_KDF *kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X963KDF, propq);

    if ((kctx = EVP_KDF_CTX_new(kdf)) != NULL) {
        *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
                                                (char *)mdname, 0);
        *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
                                                 (void *)Z, Zlen);
        *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
                                                 (void *)sinfo, sinfolen);
        *p = OSSL_PARAM_construct_end();

        ret = EVP_KDF_derive(kctx, out, outlen, params) > 0;
        EVP_KDF_CTX_free(kctx);
    }
    EVP_KDF_free(kdf);
    return ret;
}


#ifndef OPENSSL_NO_DEPRECATED_3_0
int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
                   const unsigned char *Z, size_t Zlen,
                   const unsigned char *sinfo, size_t sinfolen,
                   const EVP_MD *md)
{
    return ossl_ecdh_kdf_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md, NULL,
                               NULL);
}
#endif
