diff options
Diffstat (limited to 'thirdparty/openssl/crypto/ec/ec_ameth.c')
| -rw-r--r-- | thirdparty/openssl/crypto/ec/ec_ameth.c | 967 |
1 files changed, 0 insertions, 967 deletions
diff --git a/thirdparty/openssl/crypto/ec/ec_ameth.c b/thirdparty/openssl/crypto/ec/ec_ameth.c deleted file mode 100644 index 2c41c6e7a9..0000000000 --- a/thirdparty/openssl/crypto/ec/ec_ameth.c +++ /dev/null @@ -1,967 +0,0 @@ -/* - * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project - * 2006. - */ -/* ==================================================================== - * Copyright (c) 2006 The OpenSSL Project. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * 3. All advertising materials mentioning features or use of this - * software must display the following acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" - * - * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to - * endorse or promote products derived from this software without - * prior written permission. For written permission, please contact - * licensing@OpenSSL.org. - * - * 5. Products derived from this software may not be called "OpenSSL" - * nor may "OpenSSL" appear in their names without prior written - * permission of the OpenSSL Project. - * - * 6. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" - * - * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY - * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR - * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - * ==================================================================== - * - * This product includes cryptographic software written by Eric Young - * (eay@cryptsoft.com). This product includes software written by Tim - * Hudson (tjh@cryptsoft.com). - * - */ - -#include <stdio.h> -#include "cryptlib.h" -#include <openssl/x509.h> -#include <openssl/ec.h> -#include <openssl/bn.h> -#ifndef OPENSSL_NO_CMS -# include <openssl/cms.h> -#endif -#include <openssl/asn1t.h> -#include "asn1_locl.h" -#include "ec_lcl.h" - -#ifndef OPENSSL_NO_CMS -static int ecdh_cms_decrypt(CMS_RecipientInfo *ri); -static int ecdh_cms_encrypt(CMS_RecipientInfo *ri); -#endif - -static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key) -{ - const EC_GROUP *group; - int nid; - if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) { - ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS); - return 0; - } - if (EC_GROUP_get_asn1_flag(group) - && (nid = EC_GROUP_get_curve_name(group))) - /* we have a 'named curve' => just set the OID */ - { - *ppval = OBJ_nid2obj(nid); - *pptype = V_ASN1_OBJECT; - } else { /* explicit parameters */ - - ASN1_STRING *pstr = NULL; - pstr = ASN1_STRING_new(); - if (!pstr) - return 0; - pstr->length = i2d_ECParameters(ec_key, &pstr->data); - if (pstr->length <= 0) { - ASN1_STRING_free(pstr); - ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB); - return 0; - } - *ppval = pstr; - *pptype = V_ASN1_SEQUENCE; - } - return 1; -} - -static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) -{ - EC_KEY *ec_key = pkey->pkey.ec; - void *pval = NULL; - int ptype; - unsigned char *penc = NULL, *p; - int penclen; - - if (!eckey_param2type(&ptype, &pval, ec_key)) { - ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB); - return 0; - } - penclen = i2o_ECPublicKey(ec_key, NULL); - if (penclen <= 0) - goto err; - penc = OPENSSL_malloc(penclen); - if (!penc) - goto err; - p = penc; - penclen = i2o_ECPublicKey(ec_key, &p); - if (penclen <= 0) - goto err; - if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC), - ptype, pval, penc, penclen)) - return 1; - err: - if (ptype == V_ASN1_OBJECT) - ASN1_OBJECT_free(pval); - else - ASN1_STRING_free(pval); - if (penc) - OPENSSL_free(penc); - return 0; -} - -static EC_KEY *eckey_type2param(int ptype, void *pval) -{ - EC_KEY *eckey = NULL; - if (ptype == V_ASN1_SEQUENCE) { - ASN1_STRING *pstr = pval; - const unsigned char *pm = NULL; - int pmlen; - pm = pstr->data; - pmlen = pstr->length; - if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen))) { - ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR); - goto ecerr; - } - } else if (ptype == V_ASN1_OBJECT) { - ASN1_OBJECT *poid = pval; - EC_GROUP *group; - - /* - * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID - */ - if ((eckey = EC_KEY_new()) == NULL) { - ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE); - goto ecerr; - } - group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid)); - if (group == NULL) - goto ecerr; - EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE); - if (EC_KEY_set_group(eckey, group) == 0) - goto ecerr; - EC_GROUP_free(group); - } else { - ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR); - goto ecerr; - } - - return eckey; - - ecerr: - if (eckey) - EC_KEY_free(eckey); - return NULL; -} - -static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) -{ - const unsigned char *p = NULL; - void *pval; - int ptype, pklen; - EC_KEY *eckey = NULL; - X509_ALGOR *palg; - - if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) - return 0; - X509_ALGOR_get0(NULL, &ptype, &pval, palg); - - eckey = eckey_type2param(ptype, pval); - - if (!eckey) { - ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB); - return 0; - } - - /* We have parameters now set public key */ - if (!o2i_ECPublicKey(&eckey, &p, pklen)) { - ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR); - goto ecerr; - } - - EVP_PKEY_assign_EC_KEY(pkey, eckey); - return 1; - - ecerr: - if (eckey) - EC_KEY_free(eckey); - return 0; -} - -static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) -{ - int r; - const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec); - const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec), - *pb = EC_KEY_get0_public_key(b->pkey.ec); - if (group == NULL || pa == NULL || pb == NULL) - return -2; - r = EC_POINT_cmp(group, pa, pb, NULL); - if (r == 0) - return 1; - if (r == 1) - return 0; - return -2; -} - -static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) -{ - const unsigned char *p = NULL; - void *pval; - int ptype, pklen; - EC_KEY *eckey = NULL; - X509_ALGOR *palg; - - if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) - return 0; - X509_ALGOR_get0(NULL, &ptype, &pval, palg); - - eckey = eckey_type2param(ptype, pval); - - if (!eckey) - goto ecliberr; - - /* We have parameters now set private key */ - if (!d2i_ECPrivateKey(&eckey, &p, pklen)) { - ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR); - goto ecerr; - } - - /* calculate public key (if necessary) */ - if (EC_KEY_get0_public_key(eckey) == NULL) { - const BIGNUM *priv_key; - const EC_GROUP *group; - EC_POINT *pub_key; - /* - * the public key was not included in the SEC1 private key => - * calculate the public key - */ - group = EC_KEY_get0_group(eckey); - pub_key = EC_POINT_new(group); - if (pub_key == NULL) { - ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB); - goto ecliberr; - } - if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) { - EC_POINT_free(pub_key); - ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB); - goto ecliberr; - } - priv_key = EC_KEY_get0_private_key(eckey); - if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) { - EC_POINT_free(pub_key); - ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB); - goto ecliberr; - } - if (EC_KEY_set_public_key(eckey, pub_key) == 0) { - EC_POINT_free(pub_key); - ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB); - goto ecliberr; - } - EC_POINT_free(pub_key); - } - - EVP_PKEY_assign_EC_KEY(pkey, eckey); - return 1; - - ecliberr: - ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB); - ecerr: - if (eckey) - EC_KEY_free(eckey); - return 0; -} - -static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) -{ - EC_KEY ec_key = *(pkey->pkey.ec); - unsigned char *ep, *p; - int eplen, ptype; - void *pval; - unsigned int old_flags; - - if (!eckey_param2type(&ptype, &pval, &ec_key)) { - ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR); - return 0; - } - - /* set the private key */ - - /* - * do not include the parameters in the SEC1 private key see PKCS#11 - * 12.11 - */ - old_flags = EC_KEY_get_enc_flags(&ec_key); - EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS); - - eplen = i2d_ECPrivateKey(&ec_key, NULL); - if (!eplen) { - ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB); - return 0; - } - ep = (unsigned char *)OPENSSL_malloc(eplen); - if (!ep) { - ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); - return 0; - } - p = ep; - if (!i2d_ECPrivateKey(&ec_key, &p)) { - OPENSSL_free(ep); - ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB); - return 0; - } - - if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0, - ptype, pval, ep, eplen)) { - OPENSSL_free(ep); - return 0; - } - - return 1; -} - -static int int_ec_size(const EVP_PKEY *pkey) -{ - return ECDSA_size(pkey->pkey.ec); -} - -static int ec_bits(const EVP_PKEY *pkey) -{ - BIGNUM *order = BN_new(); - const EC_GROUP *group; - int ret; - - if (!order) { - ERR_clear_error(); - return 0; - } - group = EC_KEY_get0_group(pkey->pkey.ec); - if (!EC_GROUP_get_order(group, order, NULL)) { - ERR_clear_error(); - return 0; - } - - ret = BN_num_bits(order); - BN_free(order); - return ret; -} - -static int ec_missing_parameters(const EVP_PKEY *pkey) -{ - if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL) - return 1; - return 0; -} - -static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) -{ - EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec)); - if (group == NULL) - return 0; - if (EC_KEY_set_group(to->pkey.ec, group) == 0) - return 0; - EC_GROUP_free(group); - return 1; -} - -static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) -{ - const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec), - *group_b = EC_KEY_get0_group(b->pkey.ec); - if (group_a == NULL || group_b == NULL) - return -2; - if (EC_GROUP_cmp(group_a, group_b, NULL)) - return 0; - else - return 1; -} - -static void int_ec_free(EVP_PKEY *pkey) -{ - EC_KEY_free(pkey->pkey.ec); -} - -static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype) -{ - unsigned char *buffer = NULL; - const char *ecstr; - size_t buf_len = 0, i; - int ret = 0, reason = ERR_R_BIO_LIB; - BIGNUM *pub_key = NULL, *order = NULL; - BN_CTX *ctx = NULL; - const EC_GROUP *group; - const EC_POINT *public_key; - const BIGNUM *priv_key; - - if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) { - reason = ERR_R_PASSED_NULL_PARAMETER; - goto err; - } - - ctx = BN_CTX_new(); - if (ctx == NULL) { - reason = ERR_R_MALLOC_FAILURE; - goto err; - } - - if (ktype > 0) { - public_key = EC_KEY_get0_public_key(x); - if (public_key != NULL) { - if ((pub_key = EC_POINT_point2bn(group, public_key, - EC_KEY_get_conv_form(x), NULL, - ctx)) == NULL) { - reason = ERR_R_EC_LIB; - goto err; - } - buf_len = (size_t)BN_num_bytes(pub_key); - } - } - - if (ktype == 2) { - priv_key = EC_KEY_get0_private_key(x); - if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len) - buf_len = i; - } else - priv_key = NULL; - - if (ktype > 0) { - buf_len += 10; - if ((buffer = OPENSSL_malloc(buf_len)) == NULL) { - reason = ERR_R_MALLOC_FAILURE; - goto err; - } - } - if (ktype == 2) - ecstr = "Private-Key"; - else if (ktype == 1) - ecstr = "Public-Key"; - else - ecstr = "ECDSA-Parameters"; - - if (!BIO_indent(bp, off, 128)) - goto err; - if ((order = BN_new()) == NULL) - goto err; - if (!EC_GROUP_get_order(group, order, NULL)) - goto err; - if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0) - goto err; - - if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key, - buffer, off)) - goto err; - if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key, - buffer, off)) - goto err; - if (!ECPKParameters_print(bp, group, off)) - goto err; - ret = 1; - err: - if (!ret) - ECerr(EC_F_DO_EC_KEY_PRINT, reason); - if (pub_key) - BN_free(pub_key); - if (order) - BN_free(order); - if (ctx) - BN_CTX_free(ctx); - if (buffer != NULL) - OPENSSL_free(buffer); - return (ret); -} - -static int eckey_param_decode(EVP_PKEY *pkey, - const unsigned char **pder, int derlen) -{ - EC_KEY *eckey; - if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) { - ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB); - return 0; - } - EVP_PKEY_assign_EC_KEY(pkey, eckey); - return 1; -} - -static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder) -{ - return i2d_ECParameters(pkey->pkey.ec, pder); -} - -static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, - ASN1_PCTX *ctx) -{ - return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0); -} - -static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, - ASN1_PCTX *ctx) -{ - return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1); -} - -static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, - ASN1_PCTX *ctx) -{ - return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2); -} - -static int old_ec_priv_decode(EVP_PKEY *pkey, - const unsigned char **pder, int derlen) -{ - EC_KEY *ec; - if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) { - ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR); - return 0; - } - EVP_PKEY_assign_EC_KEY(pkey, ec); - return 1; -} - -static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder) -{ - return i2d_ECPrivateKey(pkey->pkey.ec, pder); -} - -static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) -{ - switch (op) { - case ASN1_PKEY_CTRL_PKCS7_SIGN: - if (arg1 == 0) { - int snid, hnid; - X509_ALGOR *alg1, *alg2; - PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2); - if (alg1 == NULL || alg1->algorithm == NULL) - return -1; - hnid = OBJ_obj2nid(alg1->algorithm); - if (hnid == NID_undef) - return -1; - if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey))) - return -1; - X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0); - } - return 1; -#ifndef OPENSSL_NO_CMS - case ASN1_PKEY_CTRL_CMS_SIGN: - if (arg1 == 0) { - int snid, hnid; - X509_ALGOR *alg1, *alg2; - CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2); - if (alg1 == NULL || alg1->algorithm == NULL) - return -1; - hnid = OBJ_obj2nid(alg1->algorithm); - if (hnid == NID_undef) - return -1; - if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey))) - return -1; - X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0); - } - return 1; - - case ASN1_PKEY_CTRL_CMS_ENVELOPE: - if (arg1 == 1) - return ecdh_cms_decrypt(arg2); - else if (arg1 == 0) - return ecdh_cms_encrypt(arg2); - return -2; - - case ASN1_PKEY_CTRL_CMS_RI_TYPE: - *(int *)arg2 = CMS_RECIPINFO_AGREE; - return 1; -#endif - - case ASN1_PKEY_CTRL_DEFAULT_MD_NID: - *(int *)arg2 = NID_sha256; - return 2; - - default: - return -2; - - } - -} - -const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = { - EVP_PKEY_EC, - EVP_PKEY_EC, - 0, - "EC", - "OpenSSL EC algorithm", - - eckey_pub_decode, - eckey_pub_encode, - eckey_pub_cmp, - eckey_pub_print, - - eckey_priv_decode, - eckey_priv_encode, - eckey_priv_print, - - int_ec_size, - ec_bits, - - eckey_param_decode, - eckey_param_encode, - ec_missing_parameters, - ec_copy_parameters, - ec_cmp_parameters, - eckey_param_print, - 0, - - int_ec_free, - ec_pkey_ctrl, - old_ec_priv_decode, - old_ec_priv_encode -}; - -#ifndef OPENSSL_NO_CMS - -static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx, - X509_ALGOR *alg, ASN1_BIT_STRING *pubkey) -{ - ASN1_OBJECT *aoid; - int atype; - void *aval; - int rv = 0; - EVP_PKEY *pkpeer = NULL; - EC_KEY *ecpeer = NULL; - const unsigned char *p; - int plen; - X509_ALGOR_get0(&aoid, &atype, &aval, alg); - if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey) - goto err; - /* If absent parameters get group from main key */ - if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) { - const EC_GROUP *grp; - EVP_PKEY *pk; - pk = EVP_PKEY_CTX_get0_pkey(pctx); - if (!pk) - goto err; - grp = EC_KEY_get0_group(pk->pkey.ec); - ecpeer = EC_KEY_new(); - if (!ecpeer) - goto err; - if (!EC_KEY_set_group(ecpeer, grp)) - goto err; - } else { - ecpeer = eckey_type2param(atype, aval); - if (!ecpeer) - goto err; - } - /* We have parameters now set public key */ - plen = ASN1_STRING_length(pubkey); - p = ASN1_STRING_data(pubkey); - if (!p || !plen) - goto err; - if (!o2i_ECPublicKey(&ecpeer, &p, plen)) - goto err; - pkpeer = EVP_PKEY_new(); - if (!pkpeer) - goto err; - EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer); - if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0) - rv = 1; - err: - if (ecpeer) - EC_KEY_free(ecpeer); - if (pkpeer) - EVP_PKEY_free(pkpeer); - return rv; -} - -/* Set KDF parameters based on KDF NID */ -static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid) -{ - int kdf_nid, kdfmd_nid, cofactor; - const EVP_MD *kdf_md; - if (eckdf_nid == NID_undef) - return 0; - - /* Lookup KDF type, cofactor mode and digest */ - if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid)) - return 0; - - if (kdf_nid == NID_dh_std_kdf) - cofactor = 0; - else if (kdf_nid == NID_dh_cofactor_kdf) - cofactor = 1; - else - return 0; - - if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0) - return 0; - - if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0) - return 0; - - kdf_md = EVP_get_digestbynid(kdfmd_nid); - if (!kdf_md) - return 0; - - if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0) - return 0; - return 1; -} - -static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri) -{ - int rv = 0; - - X509_ALGOR *alg, *kekalg = NULL; - ASN1_OCTET_STRING *ukm; - const unsigned char *p; - unsigned char *der = NULL; - int plen, keylen; - const EVP_CIPHER *kekcipher; - EVP_CIPHER_CTX *kekctx; - - if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm)) - return 0; - - if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) { - ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR); - return 0; - } - - if (alg->parameter->type != V_ASN1_SEQUENCE) - return 0; - - p = alg->parameter->value.sequence->data; - plen = alg->parameter->value.sequence->length; - kekalg = d2i_X509_ALGOR(NULL, &p, plen); - if (!kekalg) - goto err; - kekctx = CMS_RecipientInfo_kari_get0_ctx(ri); - if (!kekctx) - goto err; - kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); - if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE) - goto err; - if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL)) - goto err; - if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) - goto err; - - keylen = EVP_CIPHER_CTX_key_length(kekctx); - if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0) - goto err; - - plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen); - - if (!plen) - goto err; - - if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0) - goto err; - der = NULL; - - rv = 1; - err: - if (kekalg) - X509_ALGOR_free(kekalg); - if (der) - OPENSSL_free(der); - return rv; -} - -static int ecdh_cms_decrypt(CMS_RecipientInfo *ri) -{ - EVP_PKEY_CTX *pctx; - pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); - if (!pctx) - return 0; - /* See if we need to set peer key */ - if (!EVP_PKEY_CTX_get0_peerkey(pctx)) { - X509_ALGOR *alg; - ASN1_BIT_STRING *pubkey; - if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey, - NULL, NULL, NULL)) - return 0; - if (!alg || !pubkey) - return 0; - if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) { - ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR); - return 0; - } - } - /* Set ECDH derivation parameters and initialise unwrap context */ - if (!ecdh_cms_set_shared_info(pctx, ri)) { - ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR); - return 0; - } - return 1; -} - -static int ecdh_cms_encrypt(CMS_RecipientInfo *ri) -{ - EVP_PKEY_CTX *pctx; - EVP_PKEY *pkey; - EVP_CIPHER_CTX *ctx; - int keylen; - X509_ALGOR *talg, *wrap_alg = NULL; - ASN1_OBJECT *aoid; - ASN1_BIT_STRING *pubkey; - ASN1_STRING *wrap_str; - ASN1_OCTET_STRING *ukm; - unsigned char *penc = NULL; - int penclen; - int rv = 0; - int ecdh_nid, kdf_type, kdf_nid, wrap_nid; - const EVP_MD *kdf_md; - pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); - if (!pctx) - return 0; - /* Get ephemeral key */ - pkey = EVP_PKEY_CTX_get0_pkey(pctx); - if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey, - NULL, NULL, NULL)) - goto err; - X509_ALGOR_get0(&aoid, NULL, NULL, talg); - /* Is everything uninitialised? */ - if (aoid == OBJ_nid2obj(NID_undef)) { - - EC_KEY *eckey = pkey->pkey.ec; - /* Set the key */ - unsigned char *p; - - penclen = i2o_ECPublicKey(eckey, NULL); - if (penclen <= 0) - goto err; - penc = OPENSSL_malloc(penclen); - if (!penc) - goto err; - p = penc; - penclen = i2o_ECPublicKey(eckey, &p); - if (penclen <= 0) - goto err; - ASN1_STRING_set0(pubkey, penc, penclen); - pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); - pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT; - - penc = NULL; - X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), - V_ASN1_UNDEF, NULL); - } - - /* See if custom paraneters set */ - kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx); - if (kdf_type <= 0) - goto err; - if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md)) - goto err; - ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx); - if (ecdh_nid < 0) - goto err; - else if (ecdh_nid == 0) - ecdh_nid = NID_dh_std_kdf; - else if (ecdh_nid == 1) - ecdh_nid = NID_dh_cofactor_kdf; - - if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) { - kdf_type = EVP_PKEY_ECDH_KDF_X9_62; - if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0) - goto err; - } else - /* Uknown KDF */ - goto err; - if (kdf_md == NULL) { - /* Fixme later for better MD */ - kdf_md = EVP_sha1(); - if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0) - goto err; - } - - if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm)) - goto err; - - /* Lookup NID for KDF+cofactor+digest */ - - if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid)) - goto err; - /* Get wrap NID */ - ctx = CMS_RecipientInfo_kari_get0_ctx(ri); - wrap_nid = EVP_CIPHER_CTX_type(ctx); - keylen = EVP_CIPHER_CTX_key_length(ctx); - - /* Package wrap algorithm in an AlgorithmIdentifier */ - - wrap_alg = X509_ALGOR_new(); - if (!wrap_alg) - goto err; - wrap_alg->algorithm = OBJ_nid2obj(wrap_nid); - wrap_alg->parameter = ASN1_TYPE_new(); - if (!wrap_alg->parameter) - goto err; - if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0) - goto err; - if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) { - ASN1_TYPE_free(wrap_alg->parameter); - wrap_alg->parameter = NULL; - } - - if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0) - goto err; - - penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen); - - if (!penclen) - goto err; - - if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0) - goto err; - penc = NULL; - - /* - * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter - * of another AlgorithmIdentifier. - */ - penclen = i2d_X509_ALGOR(wrap_alg, &penc); - if (!penc || !penclen) - goto err; - wrap_str = ASN1_STRING_new(); - if (!wrap_str) - goto err; - ASN1_STRING_set0(wrap_str, penc, penclen); - penc = NULL; - X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str); - - rv = 1; - - err: - if (penc) - OPENSSL_free(penc); - if (wrap_alg) - X509_ALGOR_free(wrap_alg); - return rv; -} - -#endif |