- case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
- *(int *)arg2 = NID_sha1;
- 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,
- ec_security_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;
- }