[thirdparty/openssl.git] / engines / ccgost / gost_ameth.c

/**********************************************************************
 *                          gost_ameth.c                              *
 *             Copyright (c) 2005-2006 Cryptocom LTD                  *
 *         This file is distributed under the same license as OpenSSL *
 *                                                                    *
 *       Implementation of RFC 4490/4491 ASN1 method                  *
 *       for OpenSSL                                                  *
 *          Requires OpenSSL 0.9.9 for compilation                    *
 **********************************************************************/
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/engine.h>
#include <openssl/evp.h>
#include <openssl/asn1.h>
#ifndef OPENSSL_NO_CMS
# include <openssl/cms.h>
#endif
#include "gost_lcl.h"
#include "e_gost_err.h"


/* Convert little-endian byte array into bignum */
BIGNUM *hashsum2bn(const unsigned char *dgst)
{
    unsigned char buf[32];

    BUF_reverse(buf, (unsigned char*)dgst, 32);
    return BN_bin2bn(buf, 32, NULL);
}

/*
 * Pack bignum into byte buffer of given size, filling all leading bytes by
 * zeros
 */
int store_bignum(BIGNUM *bn, unsigned char *buf, int len)
{
    int bytes = BN_num_bytes(bn);

    if (bytes > len)
        return 0;
    memset(buf, 0, len);
    BN_bn2bin(bn, buf + len - bytes);
    return 1;
}

static ASN1_STRING *encode_gost_algor_params(const EVP_PKEY *key)
{
    ASN1_STRING *params = ASN1_STRING_new();
    GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
    int pkey_param_nid = NID_undef;

    if (!params || !gkp) {
        GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
        ASN1_STRING_free(params);
        params = NULL;
        goto err;
    }
    switch (EVP_PKEY_base_id(key)) {
    case NID_id_GostR3410_2001:
        pkey_param_nid =
            EC_GROUP_get_curve_name(EC_KEY_get0_group
                                    (EVP_PKEY_get0((EVP_PKEY *)key)));
        break;
    }
    gkp->key_params = OBJ_nid2obj(pkey_param_nid);
    gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_94_CryptoProParamSet);
    /*
     * gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);
     */
    params->length = i2d_GOST_KEY_PARAMS(gkp, &params->data);
    if (params->length <= 0) {
        GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
        ASN1_STRING_free(params);
        params = NULL;
        goto err;
    }
    params->type = V_ASN1_SEQUENCE;
 err:
    GOST_KEY_PARAMS_free(gkp);
    return params;
}

/*
 * Parses GOST algorithm parameters from X509_ALGOR and modifies pkey setting
 * NID and parameters
 */
static int decode_gost_algor_params(EVP_PKEY *pkey, X509_ALGOR *palg)
{
    ASN1_OBJECT *palg_obj = NULL;
    int ptype = V_ASN1_UNDEF;
    int pkey_nid = NID_undef, param_nid = NID_undef;
    void *_pval;
    ASN1_STRING *pval = NULL;
    const unsigned char *p;
    GOST_KEY_PARAMS *gkp = NULL;

    X509_ALGOR_get0(&palg_obj, &ptype, &_pval, palg);
    pval = _pval;
    if (ptype != V_ASN1_SEQUENCE) {
        GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
                GOST_R_BAD_KEY_PARAMETERS_FORMAT);
        return 0;
    }
    p = pval->data;
    pkey_nid = OBJ_obj2nid(palg_obj);

    gkp = d2i_GOST_KEY_PARAMS(NULL, &p, pval->length);
    if (!gkp) {
        GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
                GOST_R_BAD_PKEY_PARAMETERS_FORMAT);
        return 0;
    }
    param_nid = OBJ_obj2nid(gkp->key_params);
    GOST_KEY_PARAMS_free(gkp);
    if (!EVP_PKEY_set_type(pkey, pkey_nid)) {
        GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    switch (pkey_nid) {
    case NID_id_GostR3410_2001:
        {
            EC_KEY *ec = EVP_PKEY_get0(pkey);
            if (!ec) {
                ec = EC_KEY_new();
                if (!EVP_PKEY_assign(pkey, pkey_nid, ec))
                    return 0;
            }
            if (!fill_GOST2001_params(ec, param_nid))
                return 0;
        }
    }

    return 1;
}

static int gost_set_priv_key(EVP_PKEY *pkey, BIGNUM *priv)
{
    switch (EVP_PKEY_base_id(pkey)) {
    case NID_id_GostR3410_2001:
        {
            EC_KEY *ec = EVP_PKEY_get0(pkey);
            if (!ec) {
                ec = EC_KEY_new();
                EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), ec);
            }
            if (!EC_KEY_set_private_key(ec, priv))
                return 0;
            if (!EVP_PKEY_missing_parameters(pkey))
                gost2001_compute_public(ec);
            break;
        }
    }
    return 1;
}

BIGNUM *gost_get0_priv_key(const EVP_PKEY *pkey)
{
    switch (EVP_PKEY_base_id(pkey)) {
    case NID_id_GostR3410_2001:
        {
            EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pkey);
            const BIGNUM *priv;
            if (!ec) {
                return NULL;
            }
            if ((priv = EC_KEY_get0_private_key(ec)) == NULL)
                return NULL;
            return (BIGNUM *)priv;
        }
    }
    return NULL;
}

static int pkey_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
    switch (op) {
    case ASN1_PKEY_CTRL_PKCS7_SIGN:
        if (arg1 == 0) {
            X509_ALGOR *alg1 = NULL, *alg2 = NULL;
            int nid = EVP_PKEY_base_id(pkey);
            PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO *)arg2,
                                        NULL, &alg1, &alg2);
            X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
                            V_ASN1_NULL, 0);
            if (nid == NID_undef) {
                return (-1);
            }
            X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
        }
        return 1;
#ifndef OPENSSL_NO_CMS
    case ASN1_PKEY_CTRL_CMS_SIGN:
        if (arg1 == 0) {
            X509_ALGOR *alg1 = NULL, *alg2 = NULL;
            int nid = EVP_PKEY_base_id(pkey);
            CMS_SignerInfo_get0_algs((CMS_SignerInfo *)arg2,
                                     NULL, NULL, &alg1, &alg2);
            X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
                            V_ASN1_NULL, 0);
            if (nid == NID_undef) {
                return (-1);
            }
            X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
        }
        return 1;
#endif
    case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
        if (arg1 == 0) {
            X509_ALGOR *alg;
            ASN1_STRING *params = encode_gost_algor_params(pkey);
            if (!params) {
                return -1;
            }
            PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO *)arg2, &alg);
            X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type),
                            V_ASN1_SEQUENCE, params);
        }
        return 1;
#ifndef OPENSSL_NO_CMS
    case ASN1_PKEY_CTRL_CMS_ENVELOPE:
        if (arg1 == 0) {
            X509_ALGOR *alg = NULL;
            ASN1_STRING *params = encode_gost_algor_params(pkey);
            if (!params) {
                return -1;
            }
            CMS_RecipientInfo_ktri_get0_algs((CMS_RecipientInfo *)arg2, NULL,
                                             NULL, &alg);
            X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type), V_ASN1_SEQUENCE,
                            params);
        }
        return 1;
#endif
    case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
        *(int *)arg2 = NID_id_GostR3411_94;
        return 2;
    }

    return -2;
}

/* --------------------- free functions * ------------------------------*/
static void pkey_free_gost01(EVP_PKEY *key)
{
    EC_KEY_free(key->pkey.ec);
}

/* ------------------ private key functions  -----------------------------*/
static int priv_decode_gost(EVP_PKEY *pk, PKCS8_PRIV_KEY_INFO *p8inf)
{
    const unsigned char *pkey_buf = NULL, *p = NULL;
    int priv_len = 0;
    BIGNUM *pk_num = NULL;
    int ret = 0;
    X509_ALGOR *palg = NULL;
    ASN1_OBJECT *palg_obj = NULL;
    ASN1_INTEGER *priv_key = NULL;

    if (!PKCS8_pkey_get0(&palg_obj, &pkey_buf, &priv_len, &palg, p8inf))
        return 0;
    p = pkey_buf;
    if (!decode_gost_algor_params(pk, palg)) {
        return 0;
    }
    if (V_ASN1_OCTET_STRING == *p) {
        /* New format - Little endian octet string */
        unsigned char rev_buf[32];
        int i;
        ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL, &p, priv_len);
        if (!s || s->length != 32) {
            GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
            return 0;
        }
        for (i = 0; i < 32; i++) {
            rev_buf[31 - i] = s->data[i];
        }
        ASN1_STRING_free(s);
        pk_num = getbnfrombuf(rev_buf, 32);
    } else {
        priv_key = d2i_ASN1_INTEGER(NULL, &p, priv_len);
        if (!priv_key)
            return 0;
        ret = ((pk_num = ASN1_INTEGER_to_BN(priv_key, NULL)) != NULL);
        ASN1_INTEGER_free(priv_key);
        if (!ret) {
            GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
            return 0;
        }
    }

    ret = gost_set_priv_key(pk, pk_num);
    BN_free(pk_num);
    return ret;
}

/* ----------------------------------------------------------------------*/
static int priv_encode_gost(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk)
{
    ASN1_OBJECT *algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
    ASN1_STRING *params = encode_gost_algor_params(pk);
    unsigned char *priv_buf = NULL;
    int priv_len;

    ASN1_INTEGER *asn1key = NULL;
    if (!params) {
        return 0;
    }
    asn1key = BN_to_ASN1_INTEGER(gost_get0_priv_key(pk), NULL);
    priv_len = i2d_ASN1_INTEGER(asn1key, &priv_buf);
    ASN1_INTEGER_free(asn1key);
    return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
                           priv_buf, priv_len);
}

/* --------- printing keys --------------------------------*/
static int print_gost_01(BIO *out, const EVP_PKEY *pkey, int indent,
                         ASN1_PCTX *pctx, int type)
{
    int param_nid = NID_undef;
    if (type == 2) {
        BIGNUM *key;

        if (!BIO_indent(out, indent, 128))
            return 0;
        BIO_printf(out, "Private key: ");
        key = gost_get0_priv_key(pkey);
        if (!key)
            BIO_printf(out, "<undefined)");
        else
            BN_print(out, key);
        BIO_printf(out, "\n");
    }
    if (type >= 1) {
        BN_CTX *ctx = BN_CTX_new();
        BIGNUM *X, *Y;
        const EC_POINT *pubkey;
        const EC_GROUP *group;

        if (!ctx) {
            GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_MALLOC_FAILURE);
            return 0;
        }
        BN_CTX_start(ctx);
        X = BN_CTX_get(ctx);
        Y = BN_CTX_get(ctx);
        pubkey =
            EC_KEY_get0_public_key((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
        group = EC_KEY_get0_group((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
        if (!EC_POINT_get_affine_coordinates_GFp(group, pubkey, X, Y, ctx)) {
            GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_EC_LIB);
            BN_CTX_free(ctx);
            return 0;
        }
        if (!BIO_indent(out, indent, 128))
            return 0;
        BIO_printf(out, "Public key:\n");
        if (!BIO_indent(out, indent + 3, 128))
            return 0;
        BIO_printf(out, "X:");
        BN_print(out, X);
        BIO_printf(out, "\n");
        BIO_indent(out, indent + 3, 128);
        BIO_printf(out, "Y:");
        BN_print(out, Y);
        BIO_printf(out, "\n");
        BN_CTX_end(ctx);
        BN_CTX_free(ctx);
    }

    param_nid =
        EC_GROUP_get_curve_name(EC_KEY_get0_group
                                (EVP_PKEY_get0((EVP_PKEY *)pkey)));
    if (!BIO_indent(out, indent, 128))
        return 0;
    BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
    return 1;
}

static int param_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
                              ASN1_PCTX *pctx)
{
    return print_gost_01(out, pkey, indent, pctx, 0);
}

static int pub_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
                            ASN1_PCTX *pctx)
{
    return print_gost_01(out, pkey, indent, pctx, 1);
}

static int priv_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
                             ASN1_PCTX *pctx)
{
    return print_gost_01(out, pkey, indent, pctx, 2);
}

/* ---------------------------------------------------------------------*/
static int param_missing_gost01(const EVP_PKEY *pk)
{
    const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
    if (!ec)
        return 1;
    if (!EC_KEY_get0_group(ec))
        return 1;
    return 0;
}


static int param_copy_gost01(EVP_PKEY *to, const EVP_PKEY *from)
{
    EC_KEY *eto = EVP_PKEY_get0(to);
    const EC_KEY *efrom = EVP_PKEY_get0((EVP_PKEY *)from);
    if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
        GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_INCOMPATIBLE_ALGORITHMS);
        return 0;
    }
    if (!efrom) {
        GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_KEY_PARAMETERS_MISSING);
        return 0;
    }
    if (!eto) {
        eto = EC_KEY_new();
        if (!eto) {
            GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_MALLOC_FAILURE);
            return 0;
        }
        if (!EVP_PKEY_assign(to, EVP_PKEY_base_id(from), eto)) {
            GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_INTERNAL_ERROR);
            return 0;
        }
    }
    if (!EC_KEY_set_group(eto, EC_KEY_get0_group(efrom))) {
        GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    if (EC_KEY_get0_private_key(eto)) {
        gost2001_compute_public(eto);
    }
    return 1;
}

static int param_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
{
    if (EC_GROUP_get_curve_name
        (EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)a))) ==
        EC_GROUP_get_curve_name(EC_KEY_get0_group
                                (EVP_PKEY_get0((EVP_PKEY *)b)))) {
        return 1;
    }
    return 0;

}

/* ---------- Public key functions * --------------------------------------*/

static int pub_decode_gost01(EVP_PKEY *pk, X509_PUBKEY *pub)
{
    X509_ALGOR *palg = NULL;
    const unsigned char *pubkey_buf = NULL;
    unsigned char *databuf;
    ASN1_OBJECT *palgobj = NULL;
    int pub_len, i, j;
    EC_POINT *pub_key;
    BIGNUM *X, *Y;
    ASN1_OCTET_STRING *octet = NULL;
    int len;
    const EC_GROUP *group;

    if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
        return 0;
    EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
    if (!decode_gost_algor_params(pk, palg))
        return 0;
    group = EC_KEY_get0_group(EVP_PKEY_get0(pk));
    octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
    if (!octet) {
        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
        return 0;
    }
    databuf = OPENSSL_malloc(octet->length);
    if (databuf == NULL) {
        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
        ASN1_OCTET_STRING_free(octet);
        return 0;
    }
    for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
        databuf[j] = octet->data[i];
    }
    len = octet->length / 2;
    ASN1_OCTET_STRING_free(octet);

    Y = getbnfrombuf(databuf, len);
    X = getbnfrombuf(databuf + len, len);
    OPENSSL_free(databuf);
    pub_key = EC_POINT_new(group);
    if (!EC_POINT_set_affine_coordinates_GFp(group, pub_key, X, Y, NULL)) {
        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
        EC_POINT_free(pub_key);
        BN_free(X);
        BN_free(Y);
        return 0;
    }
    BN_free(X);
    BN_free(Y);
    if (!EC_KEY_set_public_key(EVP_PKEY_get0(pk), pub_key)) {
        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
        EC_POINT_free(pub_key);
        return 0;
    }
    EC_POINT_free(pub_key);
    return 1;

}

static int pub_encode_gost01(X509_PUBKEY *pub, const EVP_PKEY *pk)
{
    ASN1_OBJECT *algobj = NULL;
    ASN1_OCTET_STRING *octet = NULL;
    void *pval = NULL;
    unsigned char *buf = NULL, *databuf, *sptr;
    int i, j, data_len, ret = 0;
    const EC_POINT *pub_key;
    BIGNUM *X, *Y, *order;
    const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
    int ptype = V_ASN1_UNDEF;

    algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
    if (pk->save_parameters) {
        ASN1_STRING *params = encode_gost_algor_params(pk);
        pval = params;
        ptype = V_ASN1_SEQUENCE;
    }
    order = BN_new();
    EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL);
    pub_key = EC_KEY_get0_public_key(ec);
    if (!pub_key) {
        GOSTerr(GOST_F_PUB_ENCODE_GOST01, GOST_R_PUBLIC_KEY_UNDEFINED);
        BN_free(order);
        return 0;
    }
    X = BN_new();
    Y = BN_new();
    if (!X || !Y) {
        GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
        BN_free(X);
        BN_free(Y);
        BN_free(order);
        return 0;
    }
    if (!EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(ec),
                                        pub_key, X, Y, NULL)) {
        GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_INTERNAL_ERROR);
        BN_free(X);
        BN_free(Y);
        BN_free(order);
        return 0;
    }
    data_len = 2 * BN_num_bytes(order);
    BN_free(order);
    databuf = OPENSSL_malloc(data_len);
    if (databuf == NULL) {
        GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
        BN_free(X);
        BN_free(Y);
        return 0;
    }
    memset(databuf, 0, data_len);

    store_bignum(X, databuf + data_len / 2, data_len / 2);
    store_bignum(Y, databuf, data_len / 2);

    BN_free(X);
    BN_free(Y);
    octet = ASN1_OCTET_STRING_new();
    if (octet == NULL) {
        GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
        OPENSSL_free(databuf);
        return 0;
    }
    ASN1_STRING_set(octet, NULL, data_len);
    sptr = ASN1_STRING_data(octet);
    for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
        sptr[i] = databuf[j];
    }
    OPENSSL_free(databuf);
    ret = i2d_ASN1_OCTET_STRING(octet, &buf);
    ASN1_BIT_STRING_free(octet);
    if (ret < 0)
        return 0;
    return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
}

static int pub_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
{
    const EC_KEY *ea = EVP_PKEY_get0((EVP_PKEY *)a);
    const EC_KEY *eb = EVP_PKEY_get0((EVP_PKEY *)b);
    const EC_POINT *ka, *kb;
    int ret = 0;
    if (!ea || !eb)
        return 0;
    ka = EC_KEY_get0_public_key(ea);
    kb = EC_KEY_get0_public_key(eb);
    if (!ka || !kb)
        return 0;
    ret = (0 == EC_POINT_cmp(EC_KEY_get0_group(ea), ka, kb, NULL));
    return ret;
}

static int pkey_size_gost(const EVP_PKEY *pk)
{
    return 64;
}

static int pkey_bits_gost(const EVP_PKEY *pk)
{
    return 256;
}

/* ---------------------- ASN1 METHOD for GOST MAC  -------------------*/
static void mackey_free_gost(EVP_PKEY *pk)
{
    OPENSSL_free(pk->pkey.ptr);
}

static int mac_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
    switch (op) {
    case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
        *(int *)arg2 = NID_id_Gost28147_89_MAC;
        return 2;
    }
    return -2;
}

static int gost2001_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
    int nid =
        EC_GROUP_get_curve_name(EC_KEY_get0_group
                                (EVP_PKEY_get0((EVP_PKEY *)pkey)));
    return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
}

static int gost2001_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
                                 int derlen)
{
    ASN1_OBJECT *obj = NULL;
    int nid;
    EC_KEY *ec = EVP_PKEY_get0(pkey);
    if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
        return 0;
    }
    nid = OBJ_obj2nid(obj);
    ASN1_OBJECT_free(obj);
    if (!ec) {
        ec = EC_KEY_new();
        if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_2001, ec))
            return 0;
    }
    if (!fill_GOST2001_params(ec, nid))
        return 0;
    return 1;
}

/* ----------------------------------------------------------------------*/
int register_ameth_gost(int nid, EVP_PKEY_ASN1_METHOD **ameth,
                        const char *pemstr, const char *info)
{
    *ameth = EVP_PKEY_asn1_new(nid, ASN1_PKEY_SIGPARAM_NULL, pemstr, info);
    if (!*ameth)
        return 0;
    switch (nid) {
    case NID_id_GostR3410_2001:
        EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost01);
        EVP_PKEY_asn1_set_private(*ameth,
                                  priv_decode_gost, priv_encode_gost,
                                  priv_print_gost01);

        EVP_PKEY_asn1_set_param(*ameth,
                                gost2001_param_decode, gost2001_param_encode,
                                param_missing_gost01, param_copy_gost01,
                                param_cmp_gost01, param_print_gost01);
        EVP_PKEY_asn1_set_public(*ameth,
                                 pub_decode_gost01, pub_encode_gost01,
                                 pub_cmp_gost01, pub_print_gost01,
                                 pkey_size_gost, pkey_bits_gost);

        EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
        break;
    case NID_id_Gost28147_89_MAC:
        EVP_PKEY_asn1_set_free(*ameth, mackey_free_gost);
        EVP_PKEY_asn1_set_ctrl(*ameth, mac_ctrl_gost);
        break;
    }
    return 1;
}
Commit	Line	Data
a04549cc	1	/**********************************************************************
926c41bd	2	* gost_ameth.c *
a04549cc DSH	3	* Copyright (c) 2005-2006 Cryptocom LTD *
	4	* This file is distributed under the same license as OpenSSL *
	5	* *
	6	* Implementation of RFC 4490/4491 ASN1 method *
	7	* for OpenSSL *
	8	* Requires OpenSSL 0.9.9 for compilation *
	9	**********************************************************************/
1e26a8ba GT	10	#include <string.h>
	11	#include <openssl/crypto.h>
	12	#include <openssl/err.h>
a04549cc DSH	13	#include <openssl/engine.h>
a04549cc DSH	14	#include <openssl/evp.h>
a4346646	15	#include <openssl/asn1.h>
174b07be	16	#ifndef OPENSSL_NO_CMS
0f113f3e	17	# include <openssl/cms.h>
174b07be	18	#endif
926c41bd	19	#include "gost_lcl.h"
a04549cc DSH	20	#include "e_gost_err.h"
a04549cc DSH	21
ade44dcb RS	22
	23	/* Convert little-endian byte array into bignum */
	24	BIGNUM hashsum2bn(const unsigned char dgst)
0f113f3e	25	{
ade44dcb RS	26	unsigned char buf[32];
	27
	28	BUF_reverse(buf, (unsigned char*)dgst, 32);
	29	return BN_bin2bn(buf, 32, NULL);
	30	}
	31
	32	/*
	33	* Pack bignum into byte buffer of given size, filling all leading bytes by
	34	* zeros
	35	*/
	36	int store_bignum(BIGNUM bn, unsigned char buf, int len)
	37	{
	38	int bytes = BN_num_bytes(bn);
	39
	40	if (bytes > len)
	41	return 0;
	42	memset(buf, 0, len);
	43	BN_bn2bin(bn, buf + len - bytes);
	44	return 1;
0f113f3e MC	45	}
	46
	47	static ASN1_STRING encode_gost_algor_params(const EVP_PKEY key)
	48	{
	49	ASN1_STRING *params = ASN1_STRING_new();
	50	GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
	51	int pkey_param_nid = NID_undef;
	52
	53	if (!params \|\| !gkp) {
	54	GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
	55	ASN1_STRING_free(params);
	56	params = NULL;
	57	goto err;
	58	}
	59	switch (EVP_PKEY_base_id(key)) {
	60	case NID_id_GostR3410_2001:
	61	pkey_param_nid =
	62	EC_GROUP_get_curve_name(EC_KEY_get0_group
	63	(EVP_PKEY_get0((EVP_PKEY *)key)));
	64	break;
0f113f3e MC	65	}
	66	gkp->key_params = OBJ_nid2obj(pkey_param_nid);
	67	gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_94_CryptoProParamSet);
	68	/*
	69	* gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);
	70	*/
	71	params->length = i2d_GOST_KEY_PARAMS(gkp, &params->data);
	72	if (params->length <= 0) {
	73	GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
	74	ASN1_STRING_free(params);
	75	params = NULL;
	76	goto err;
	77	}
	78	params->type = V_ASN1_SEQUENCE;
	79	err:
	80	GOST_KEY_PARAMS_free(gkp);
	81	return params;
	82	}
	83
	84	/*
	85	* Parses GOST algorithm parameters from X509_ALGOR and modifies pkey setting
	86	* NID and parameters
a04549cc	87	*/
0f113f3e MC	88	static int decode_gost_algor_params(EVP_PKEY pkey, X509_ALGOR palg)
	89	{
	90	ASN1_OBJECT *palg_obj = NULL;
	91	int ptype = V_ASN1_UNDEF;
	92	int pkey_nid = NID_undef, param_nid = NID_undef;
	93	void *_pval;
	94	ASN1_STRING *pval = NULL;
	95	const unsigned char *p;
	96	GOST_KEY_PARAMS *gkp = NULL;
	97
	98	X509_ALGOR_get0(&palg_obj, &ptype, &_pval, palg);
	99	pval = _pval;
	100	if (ptype != V_ASN1_SEQUENCE) {
	101	GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
	102	GOST_R_BAD_KEY_PARAMETERS_FORMAT);
	103	return 0;
	104	}
	105	p = pval->data;
	106	pkey_nid = OBJ_obj2nid(palg_obj);
	107
	108	gkp = d2i_GOST_KEY_PARAMS(NULL, &p, pval->length);
	109	if (!gkp) {
	110	GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
	111	GOST_R_BAD_PKEY_PARAMETERS_FORMAT);
	112	return 0;
	113	}
	114	param_nid = OBJ_obj2nid(gkp->key_params);
	115	GOST_KEY_PARAMS_free(gkp);
61986d32	116	if (!EVP_PKEY_set_type(pkey, pkey_nid)) {
8817e2e0 MC	117	GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS, ERR_R_INTERNAL_ERROR);
	118	return 0;
	119	}
0f113f3e	120	switch (pkey_nid) {
0f113f3e MC	121	case NID_id_GostR3410_2001:
	122	{
	123	EC_KEY *ec = EVP_PKEY_get0(pkey);
	124	if (!ec) {
	125	ec = EC_KEY_new();
	126	if (!EVP_PKEY_assign(pkey, pkey_nid, ec))
	127	return 0;
	128	}
	129	if (!fill_GOST2001_params(ec, param_nid))
	130	return 0;
	131	}
	132	}
	133
	134	return 1;
	135	}
	136
	137	static int gost_set_priv_key(EVP_PKEY pkey, BIGNUM priv)
	138	{
	139	switch (EVP_PKEY_base_id(pkey)) {
0f113f3e MC	140	case NID_id_GostR3410_2001:
	141	{
	142	EC_KEY *ec = EVP_PKEY_get0(pkey);
	143	if (!ec) {
	144	ec = EC_KEY_new();
	145	EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), ec);
	146	}
	147	if (!EC_KEY_set_private_key(ec, priv))
	148	return 0;
	149	if (!EVP_PKEY_missing_parameters(pkey))
	150	gost2001_compute_public(ec);
	151	break;
	152	}
	153	}
	154	return 1;
	155	}
	156
	157	BIGNUM gost_get0_priv_key(const EVP_PKEY pkey)
	158	{
	159	switch (EVP_PKEY_base_id(pkey)) {
0f113f3e MC	160	case NID_id_GostR3410_2001:
	161	{
	162	EC_KEY ec = EVP_PKEY_get0((EVP_PKEY )pkey);
	163	const BIGNUM *priv;
	164	if (!ec) {
	165	return NULL;
	166	}
75ebbd9a	167	if ((priv = EC_KEY_get0_private_key(ec)) == NULL)
0f113f3e MC	168	return NULL;
0f113f3e MC	169	return (BIGNUM *)priv;
0f113f3e MC	170	}
	171	}
	172	return NULL;
	173	}
	174
	175	static int pkey_ctrl_gost(EVP_PKEY pkey, int op, long arg1, void arg2)
	176	{
	177	switch (op) {
	178	case ASN1_PKEY_CTRL_PKCS7_SIGN:
	179	if (arg1 == 0) {
	180	X509_ALGOR alg1 = NULL, alg2 = NULL;
	181	int nid = EVP_PKEY_base_id(pkey);
	182	PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO *)arg2,
	183	NULL, &alg1, &alg2);
	184	X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
	185	V_ASN1_NULL, 0);
	186	if (nid == NID_undef) {
	187	return (-1);
	188	}
	189	X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
	190	}
	191	return 1;
174b07be	192	#ifndef OPENSSL_NO_CMS
0f113f3e MC	193	case ASN1_PKEY_CTRL_CMS_SIGN:
	194	if (arg1 == 0) {
	195	X509_ALGOR alg1 = NULL, alg2 = NULL;
	196	int nid = EVP_PKEY_base_id(pkey);
	197	CMS_SignerInfo_get0_algs((CMS_SignerInfo *)arg2,
	198	NULL, NULL, &alg1, &alg2);
	199	X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
	200	V_ASN1_NULL, 0);
	201	if (nid == NID_undef) {
	202	return (-1);
	203	}
	204	X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
	205	}
	206	return 1;
174b07be	207	#endif
0f113f3e MC	208	case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
	209	if (arg1 == 0) {
	210	X509_ALGOR *alg;
	211	ASN1_STRING *params = encode_gost_algor_params(pkey);
	212	if (!params) {
	213	return -1;
	214	}
	215	PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO *)arg2, &alg);
	216	X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type),
	217	V_ASN1_SEQUENCE, params);
	218	}
	219	return 1;
174b07be	220	#ifndef OPENSSL_NO_CMS
0f113f3e MC	221	case ASN1_PKEY_CTRL_CMS_ENVELOPE:
	222	if (arg1 == 0) {
	223	X509_ALGOR *alg = NULL;
	224	ASN1_STRING *params = encode_gost_algor_params(pkey);
	225	if (!params) {
	226	return -1;
	227	}
	228	CMS_RecipientInfo_ktri_get0_algs((CMS_RecipientInfo *)arg2, NULL,
	229	NULL, &alg);
	230	X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type), V_ASN1_SEQUENCE,
	231	params);
	232	}
	233	return 1;
174b07be	234	#endif
0f113f3e MC	235	case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
	236	(int )arg2 = NID_id_GostR3411_94;
	237	return 2;
	238	}
	239
	240	return -2;
	241	}
	242
	243	/* --------------------- free functions * ------------------------------*/
0f113f3e MC	244	static void pkey_free_gost01(EVP_PKEY *key)
0f113f3e MC	245	{
8fdc3734	246	EC_KEY_free(key->pkey.ec);
0f113f3e	247	}
926c41bd	248
a04549cc	249	/* ------------------ private key functions -----------------------------*/
0f113f3e MC	250	static int priv_decode_gost(EVP_PKEY pk, PKCS8_PRIV_KEY_INFO p8inf)
	251	{
	252	const unsigned char pkey_buf = NULL, p = NULL;
	253	int priv_len = 0;
	254	BIGNUM *pk_num = NULL;
	255	int ret = 0;
	256	X509_ALGOR *palg = NULL;
	257	ASN1_OBJECT *palg_obj = NULL;
	258	ASN1_INTEGER *priv_key = NULL;
	259
	260	if (!PKCS8_pkey_get0(&palg_obj, &pkey_buf, &priv_len, &palg, p8inf))
	261	return 0;
	262	p = pkey_buf;
	263	if (!decode_gost_algor_params(pk, palg)) {
	264	return 0;
	265	}
	266	if (V_ASN1_OCTET_STRING == *p) {
	267	/* New format - Little endian octet string */
	268	unsigned char rev_buf[32];
	269	int i;
	270	ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL, &p, priv_len);
	271	if (!s \|\| s->length != 32) {
	272	GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
	273	return 0;
	274	}
	275	for (i = 0; i < 32; i++) {
	276	rev_buf[31 - i] = s->data[i];
	277	}
	278	ASN1_STRING_free(s);
	279	pk_num = getbnfrombuf(rev_buf, 32);
	280	} else {
	281	priv_key = d2i_ASN1_INTEGER(NULL, &p, priv_len);
	282	if (!priv_key)
	283	return 0;
	284	ret = ((pk_num = ASN1_INTEGER_to_BN(priv_key, NULL)) != NULL);
	285	ASN1_INTEGER_free(priv_key);
	286	if (!ret) {
	287	GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
	288	return 0;
	289	}
	290	}
	291
	292	ret = gost_set_priv_key(pk, pk_num);
	293	BN_free(pk_num);
	294	return ret;
	295	}
926c41bd	296
a04549cc DSH	297	/* ----------------------------------------------------------------------*/
a04549cc DSH	298	static int priv_encode_gost(PKCS8_PRIV_KEY_INFO p8, const EVP_PKEY pk)
0f113f3e MC	299	{
	300	ASN1_OBJECT *algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
	301	ASN1_STRING *params = encode_gost_algor_params(pk);
	302	unsigned char *priv_buf = NULL;
	303	int priv_len;
	304
	305	ASN1_INTEGER *asn1key = NULL;
	306	if (!params) {
	307	return 0;
	308	}
	309	asn1key = BN_to_ASN1_INTEGER(gost_get0_priv_key(pk), NULL);
	310	priv_len = i2d_ASN1_INTEGER(asn1key, &priv_buf);
	311	ASN1_INTEGER_free(asn1key);
	312	return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
	313	priv_buf, priv_len);
	314	}
	315
98057eba	316	/* --------- printing keys --------------------------------*/
98057eba	317	static int print_gost_01(BIO out, const EVP_PKEY pkey, int indent,
0f113f3e MC	318	ASN1_PCTX *pctx, int type)
	319	{
	320	int param_nid = NID_undef;
	321	if (type == 2) {
	322	BIGNUM *key;
	323
	324	if (!BIO_indent(out, indent, 128))
	325	return 0;
	326	BIO_printf(out, "Private key: ");
	327	key = gost_get0_priv_key(pkey);
	328	if (!key)
	329	BIO_printf(out, "<undefined)");
	330	else
	331	BN_print(out, key);
	332	BIO_printf(out, "\n");
	333	}
	334	if (type >= 1) {
	335	BN_CTX *ctx = BN_CTX_new();
	336	BIGNUM X, Y;
	337	const EC_POINT *pubkey;
	338	const EC_GROUP *group;
	339
	340	if (!ctx) {
	341	GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_MALLOC_FAILURE);
	342	return 0;
	343	}
	344	BN_CTX_start(ctx);
	345	X = BN_CTX_get(ctx);
	346	Y = BN_CTX_get(ctx);
	347	pubkey =
	348	EC_KEY_get0_public_key((EC_KEY )EVP_PKEY_get0((EVP_PKEY )pkey));
	349	group = EC_KEY_get0_group((EC_KEY )EVP_PKEY_get0((EVP_PKEY )pkey));
	350	if (!EC_POINT_get_affine_coordinates_GFp(group, pubkey, X, Y, ctx)) {
	351	GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_EC_LIB);
	352	BN_CTX_free(ctx);
	353	return 0;
	354	}
	355	if (!BIO_indent(out, indent, 128))
	356	return 0;
	357	BIO_printf(out, "Public key:\n");
	358	if (!BIO_indent(out, indent + 3, 128))
	359	return 0;
	360	BIO_printf(out, "X:");
	361	BN_print(out, X);
	362	BIO_printf(out, "\n");
	363	BIO_indent(out, indent + 3, 128);
	364	BIO_printf(out, "Y:");
	365	BN_print(out, Y);
	366	BIO_printf(out, "\n");
	367	BN_CTX_end(ctx);
	368	BN_CTX_free(ctx);
	369	}
	370
	371	param_nid =
	372	EC_GROUP_get_curve_name(EC_KEY_get0_group
	373	(EVP_PKEY_get0((EVP_PKEY *)pkey)));
	374	if (!BIO_indent(out, indent, 128))
	375	return 0;
	376	BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
	377	return 1;
98057eba	378	}
0f113f3e	379
98057eba	380	static int param_print_gost01(BIO out, const EVP_PKEY pkey, int indent,
0f113f3e MC	381	ASN1_PCTX *pctx)
	382	{
	383	return print_gost_01(out, pkey, indent, pctx, 0);
	384	}
	385
98057eba	386	static int pub_print_gost01(BIO out, const EVP_PKEY pkey, int indent,
0f113f3e MC	387	ASN1_PCTX *pctx)
	388	{
	389	return print_gost_01(out, pkey, indent, pctx, 1);
	390	}
	391
	392	static int priv_print_gost01(BIO out, const EVP_PKEY pkey, int indent,
	393	ASN1_PCTX *pctx)
	394	{
	395	return print_gost_01(out, pkey, indent, pctx, 2);
	396	}
	397
a04549cc	398	/* ---------------------------------------------------------------------*/
0f113f3e MC	399	static int param_missing_gost01(const EVP_PKEY *pk)
	400	{
	401	const EC_KEY ec = EVP_PKEY_get0((EVP_PKEY )pk);
	402	if (!ec)
	403	return 1;
	404	if (!EC_KEY_get0_group(ec))
	405	return 1;
	406	return 0;
	407	}
	408
0f113f3e MC	409
	410	static int param_copy_gost01(EVP_PKEY to, const EVP_PKEY from)
	411	{
	412	EC_KEY *eto = EVP_PKEY_get0(to);
	413	const EC_KEY efrom = EVP_PKEY_get0((EVP_PKEY )from);
	414	if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
	415	GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_INCOMPATIBLE_ALGORITHMS);
	416	return 0;
	417	}
	418	if (!efrom) {
	419	GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_KEY_PARAMETERS_MISSING);
	420	return 0;
	421	}
	422	if (!eto) {
	423	eto = EC_KEY_new();
61986d32	424	if (!eto) {
8817e2e0 MC	425	GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_MALLOC_FAILURE);
	426	return 0;
	427	}
61986d32	428	if (!EVP_PKEY_assign(to, EVP_PKEY_base_id(from), eto)) {
8817e2e0 MC	429	GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_INTERNAL_ERROR);
	430	return 0;
	431	}
	432	}
61986d32	433	if (!EC_KEY_set_group(eto, EC_KEY_get0_group(efrom))) {
8817e2e0 MC	434	GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_INTERNAL_ERROR);
8817e2e0 MC	435	return 0;
0f113f3e	436	}
0f113f3e MC	437	if (EC_KEY_get0_private_key(eto)) {
	438	gost2001_compute_public(eto);
	439	}
	440	return 1;
	441	}
	442
0f113f3e MC	443	static int param_cmp_gost01(const EVP_PKEY a, const EVP_PKEY b)
	444	{
	445	if (EC_GROUP_get_curve_name
	446	(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)a))) ==
	447	EC_GROUP_get_curve_name(EC_KEY_get0_group
	448	(EVP_PKEY_get0((EVP_PKEY *)b)))) {
	449	return 1;
	450	}
	451	return 0;
	452
	453	}
926c41bd	454
a04549cc	455	/* ---------- Public key functions * --------------------------------------*/
926c41bd	456
0f113f3e MC	457	static int pub_decode_gost01(EVP_PKEY pk, X509_PUBKEY pub)
	458	{
	459	X509_ALGOR *palg = NULL;
	460	const unsigned char *pubkey_buf = NULL;
	461	unsigned char *databuf;
	462	ASN1_OBJECT *palgobj = NULL;
	463	int pub_len, i, j;
	464	EC_POINT *pub_key;
	465	BIGNUM X, Y;
	466	ASN1_OCTET_STRING *octet = NULL;
	467	int len;
	468	const EC_GROUP *group;
	469
	470	if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
	471	return 0;
	472	EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
	473	if (!decode_gost_algor_params(pk, palg))
	474	return 0;
	475	group = EC_KEY_get0_group(EVP_PKEY_get0(pk));
	476	octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
	477	if (!octet) {
	478	GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
	479	return 0;
	480	}
	481	databuf = OPENSSL_malloc(octet->length);
	482	if (databuf == NULL) {
	483	GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
	484	ASN1_OCTET_STRING_free(octet);
	485	return 0;
	486	}
	487	for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
	488	databuf[j] = octet->data[i];
	489	}
	490	len = octet->length / 2;
	491	ASN1_OCTET_STRING_free(octet);
	492
	493	Y = getbnfrombuf(databuf, len);
	494	X = getbnfrombuf(databuf + len, len);
	495	OPENSSL_free(databuf);
	496	pub_key = EC_POINT_new(group);
	497	if (!EC_POINT_set_affine_coordinates_GFp(group, pub_key, X, Y, NULL)) {
	498	GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
	499	EC_POINT_free(pub_key);
	500	BN_free(X);
	501	BN_free(Y);
	502	return 0;
	503	}
	504	BN_free(X);
	505	BN_free(Y);
	506	if (!EC_KEY_set_public_key(EVP_PKEY_get0(pk), pub_key)) {
	507	GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
	508	EC_POINT_free(pub_key);
	509	return 0;
	510	}
	511	EC_POINT_free(pub_key);
	512	return 1;
	513
	514	}
	515
	516	static int pub_encode_gost01(X509_PUBKEY pub, const EVP_PKEY pk)
	517	{
	518	ASN1_OBJECT *algobj = NULL;
	519	ASN1_OCTET_STRING *octet = NULL;
	520	void *pval = NULL;
521	unsigned char buf = NULL, databuf, *sptr;
522	int i, j, data_len, ret = 0;
523	const EC_POINT *pub_key;
524	BIGNUM X, Y, *order;
525	const EC_KEY ec = EVP_PKEY_get0((EVP_PKEY )pk);
526	int ptype = V_ASN1_UNDEF;
527
528	algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
529	if (pk->save_parameters) {
530	ASN1_STRING *params = encode_gost_algor_params(pk);
531	pval = params;
532	ptype = V_ASN1_SEQUENCE;
533	}
534	order = BN_new();
535	EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL);
536	pub_key = EC_KEY_get0_public_key(ec);
537	if (!pub_key) {
538	GOSTerr(GOST_F_PUB_ENCODE_GOST01, GOST_R_PUBLIC_KEY_UNDEFINED);
539	BN_free(order);
540	return 0;
541	}
542	X = BN_new();
543	Y = BN_new();
61986d32	544	if (!X \|\| !Y) {
8817e2e0	545	GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
23a1d5e9 RS	546	BN_free(X);
23a1d5e9 RS	547	BN_free(Y);
8817e2e0 MC	548	BN_free(order);
	549	return 0;
	550	}
61986d32	551	if (!EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(ec),
8817e2e0 MC	552	pub_key, X, Y, NULL)) {
	553	GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_INTERNAL_ERROR);
	554	BN_free(X);
	555	BN_free(Y);
	556	BN_free(order);
	557	return 0;
	558	}
0f113f3e MC	559	data_len = 2 * BN_num_bytes(order);
	560	BN_free(order);
	561	databuf = OPENSSL_malloc(data_len);
	562	if (databuf == NULL) {
	563	GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
	564	BN_free(X);
	565	BN_free(Y);
	566	return 0;
	567	}
	568	memset(databuf, 0, data_len);
	569
	570	store_bignum(X, databuf + data_len / 2, data_len / 2);
	571	store_bignum(Y, databuf, data_len / 2);
	572
	573	BN_free(X);
	574	BN_free(Y);
	575	octet = ASN1_OCTET_STRING_new();
	576	if (octet == NULL) {
	577	GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
	578	OPENSSL_free(databuf);
	579	return 0;
	580	}
	581	ASN1_STRING_set(octet, NULL, data_len);
	582	sptr = ASN1_STRING_data(octet);
	583	for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
	584	sptr[i] = databuf[j];
	585	}
	586	OPENSSL_free(databuf);
	587	ret = i2d_ASN1_OCTET_STRING(octet, &buf);
	588	ASN1_BIT_STRING_free(octet);
	589	if (ret < 0)
	590	return 0;
	591	return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
	592	}
926c41bd	593
0f113f3e MC	594	static int pub_cmp_gost01(const EVP_PKEY a, const EVP_PKEY b)
	595	{
	596	const EC_KEY ea = EVP_PKEY_get0((EVP_PKEY )a);
	597	const EC_KEY eb = EVP_PKEY_get0((EVP_PKEY )b);
	598	const EC_POINT ka, kb;
	599	int ret = 0;
	600	if (!ea \|\| !eb)
	601	return 0;
	602	ka = EC_KEY_get0_public_key(ea);
	603	kb = EC_KEY_get0_public_key(eb);
	604	if (!ka \|\| !kb)
	605	return 0;
	606	ret = (0 == EC_POINT_cmp(EC_KEY_get0_group(ea), ka, kb, NULL));
	607	return ret;
	608	}
926c41bd	609
a04549cc	610	static int pkey_size_gost(const EVP_PKEY *pk)
0f113f3e MC	611	{
	612	return 64;
	613	}
926c41bd	614
a04549cc	615	static int pkey_bits_gost(const EVP_PKEY *pk)
0f113f3e MC	616	{
	617	return 256;
	618	}
	619
	620	/* ---------------------- ASN1 METHOD for GOST MAC -------------------*/
	621	static void mackey_free_gost(EVP_PKEY *pk)
	622	{
b548a1f1	623	OPENSSL_free(pk->pkey.ptr);
0f113f3e MC	624	}
0f113f3e MC	625
a4346646 DSH	626	static int mac_ctrl_gost(EVP_PKEY pkey, int op, long arg1, void arg2)
a4346646 DSH	627	{
0f113f3e MC	628	switch (op) {
	629	case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
	630	(int )arg2 = NID_id_Gost28147_89_MAC;
	631	return 2;
	632	}
	633	return -2;
	634	}
b6af2c7e	635
0f113f3e MC	636	static int gost2001_param_encode(const EVP_PKEY pkey, unsigned char *pder)
	637	{
	638	int nid =
	639	EC_GROUP_get_curve_name(EC_KEY_get0_group
	640	(EVP_PKEY_get0((EVP_PKEY *)pkey)));
	641	return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
	642	}
b6af2c7e	643
0f113f3e MC	644	static int gost2001_param_decode(EVP_PKEY pkey, const unsigned char *pder,
	645	int derlen)
	646	{
	647	ASN1_OBJECT *obj = NULL;
	648	int nid;
	649	EC_KEY *ec = EVP_PKEY_get0(pkey);
	650	if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
	651	return 0;
	652	}
	653	nid = OBJ_obj2nid(obj);
	654	ASN1_OBJECT_free(obj);
	655	if (!ec) {
	656	ec = EC_KEY_new();
	657	if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_2001, ec))
	658	return 0;
	659	}
	660	if (!fill_GOST2001_params(ec, nid))
	661	return 0;
	662	return 1;
	663	}
b6af2c7e	664
a04549cc	665	/* ----------------------------------------------------------------------*/
0f113f3e MC	666	int register_ameth_gost(int nid, EVP_PKEY_ASN1_METHOD **ameth,
	667	const char pemstr, const char info)
	668	{
	669	*ameth = EVP_PKEY_asn1_new(nid, ASN1_PKEY_SIGPARAM_NULL, pemstr, info);
	670	if (!*ameth)
	671	return 0;
	672	switch (nid) {
0f113f3e MC	673	case NID_id_GostR3410_2001:
	674	EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost01);
	675	EVP_PKEY_asn1_set_private(*ameth,
	676	priv_decode_gost, priv_encode_gost,
	677	priv_print_gost01);
	678
	679	EVP_PKEY_asn1_set_param(*ameth,
	680	gost2001_param_decode, gost2001_param_encode,
	681	param_missing_gost01, param_copy_gost01,
	682	param_cmp_gost01, param_print_gost01);
	683	EVP_PKEY_asn1_set_public(*ameth,
	684	pub_decode_gost01, pub_encode_gost01,
	685	pub_cmp_gost01, pub_print_gost01,
	686	pkey_size_gost, pkey_bits_gost);
	687
	688	EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
	689	break;
	690	case NID_id_Gost28147_89_MAC:
	691	EVP_PKEY_asn1_set_free(*ameth, mackey_free_gost);
	692	EVP_PKEY_asn1_set_ctrl(*ameth, mac_ctrl_gost);
	693	break;
	694	}
	695	return 1;
	696	}