diff options
Diffstat (limited to 'thirdparty/openssl/crypto/ec/ec_ameth.c')
| -rw-r--r-- | thirdparty/openssl/crypto/ec/ec_ameth.c | 965 |
1 files changed, 965 insertions, 0 deletions
diff --git a/thirdparty/openssl/crypto/ec/ec_ameth.c b/thirdparty/openssl/crypto/ec/ec_ameth.c new file mode 100644 index 0000000000..83e208cfe4 --- /dev/null +++ b/thirdparty/openssl/crypto/ec/ec_ameth.c @@ -0,0 +1,965 @@ +/* + * 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" + +static int ecdh_cms_decrypt(CMS_RecipientInfo *ri); +static int ecdh_cms_encrypt(CMS_RecipientInfo *ri); + +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); + 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; + unsigned char *ep, *p; + int eplen, ptype; + void *pval; + unsigned int tmp_flags, old_flags; + + ec_key = pkey->pkey.ec; + + 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); + tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS; + EC_KEY_set_enc_flags(ec_key, tmp_flags); + eplen = i2d_ECPrivateKey(ec_key, NULL); + if (!eplen) { + EC_KEY_set_enc_flags(ec_key, old_flags); + ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB); + return 0; + } + ep = (unsigned char *)OPENSSL_malloc(eplen); + if (!ep) { + EC_KEY_set_enc_flags(ec_key, old_flags); + ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); + return 0; + } + p = ep; + if (!i2d_ECPrivateKey(ec_key, &p)) { + EC_KEY_set_enc_flags(ec_key, old_flags); + OPENSSL_free(ep); + ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB); + return 0; + } + /* restore old encoding flags */ + EC_KEY_set_enc_flags(ec_key, old_flags); + + if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0, + ptype, pval, ep, eplen)) + 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 (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 (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 |