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usr / src / crypto / openssl / crypto / ec /

📁 ..
📁 asm
📄 build.info(1.9 KB)
📄 curve25519.c(196.91 KB)
📁 curve448
📄 ec2_oct.c(9.54 KB)
📄 ec2_smpl.c(26.61 KB)
📄 ec_ameth.c(25.42 KB)
📄 ec_asn1.c(39.39 KB)
📄 ec_check.c(1.89 KB)
📄 ec_curve.c(138.45 KB)
📄 ec_cvt.c(2.64 KB)
📄 ec_err.c(21.19 KB)
📄 ec_key.c(18.77 KB)
📄 ec_kmeth.c(10.35 KB)
📄 ec_lib.c(33.27 KB)
📄 ec_local.h(34.19 KB)
📄 ec_mult.c(30.58 KB)
📄 ec_oct.c(5.09 KB)
📄 ec_pmeth.c(12.34 KB)
📄 ec_print.c(2.86 KB)
📄 ecdh_kdf.c(2.36 KB)
📄 ecdh_ossl.c(3.26 KB)
📄 ecdsa_ossl.c(12.55 KB)
📄 ecdsa_sign.c(1.77 KB)
📄 ecdsa_vrf.c(1.25 KB)
📄 eck_prn.c(7.32 KB)
📄 ecp_mont.c(7.81 KB)
📄 ecp_nist.c(4.79 KB)
📄 ecp_nistp224.c(59.33 KB)
📄 ecp_nistp256.c(73.78 KB)
📄 ecp_nistp521.c(71.96 KB)
📄 ecp_nistputil.c(9.8 KB)
📄 ecp_nistz256.c(50.59 KB)
📄 ecp_nistz256_table.c(602.98 KB)
📄 ecp_oct.c(10.17 KB)
📄 ecp_smpl.c(48.07 KB)
📄 ecx_meth.c(20.65 KB)

Editing: ecdh_kdf.c

/*
 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (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
 */

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

/* Key derivation function from X9.63/SECG */
/* Way more than we will ever need */
#define ECDH_KDF_MAX    (1 << 30)

int 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)
{
    EVP_MD_CTX *mctx = NULL;
    int rv = 0;
    unsigned int i;
    size_t mdlen;
    unsigned char ctr[4];
    if (sinfolen > ECDH_KDF_MAX || outlen > ECDH_KDF_MAX
        || Zlen > ECDH_KDF_MAX)
        return 0;
    mctx = EVP_MD_CTX_new();
    if (mctx == NULL)
        return 0;
    mdlen = EVP_MD_size(md);
    for (i = 1;; i++) {
        unsigned char mtmp[EVP_MAX_MD_SIZE];
        if (!EVP_DigestInit_ex(mctx, md, NULL))
            goto err;
        ctr[3] = i & 0xFF;
        ctr[2] = (i >> 8) & 0xFF;
        ctr[1] = (i >> 16) & 0xFF;
        ctr[0] = (i >> 24) & 0xFF;
        if (!EVP_DigestUpdate(mctx, Z, Zlen))
            goto err;
        if (!EVP_DigestUpdate(mctx, ctr, sizeof(ctr)))
            goto err;
        if (!EVP_DigestUpdate(mctx, sinfo, sinfolen))
            goto err;
        if (outlen >= mdlen) {
            if (!EVP_DigestFinal(mctx, out, NULL))
                goto err;
            outlen -= mdlen;
            if (outlen == 0)
                break;
            out += mdlen;
        } else {
            if (!EVP_DigestFinal(mctx, mtmp, NULL))
                goto err;
            memcpy(out, mtmp, outlen);
            OPENSSL_cleanse(mtmp, mdlen);
            break;
        }
    }
    rv = 1;
 err:
    EVP_MD_CTX_free(mctx);
    return rv;
}

/*-
 * The old name for ecdh_KDF_X9_63
 * Retained for ABI compatibility
 */
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 ecdh_KDF_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md);
}

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Editing: ecdh_kdf.c

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