#include "openssl/param_build.h"
#include "ec_local.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, const EC_KEY *ec_key)
{
const EC_GROUP *group;
}
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;
{
return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
}
-
-#ifndef OPENSSL_NO_CMS
-
-static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
- X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
-{
- const ASN1_OBJECT *aoid;
- int atype;
- const 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 == NULL)
- goto err;
- grp = EC_KEY_get0_group(pk->pkey.ec);
- ecpeer = EC_KEY_new();
- if (ecpeer == NULL)
- goto err;
- if (!EC_KEY_set_group(ecpeer, grp))
- goto err;
- } else {
- ecpeer = eckey_type2param(atype, aval, pctx->libctx, pctx->propquery);
- if (!ecpeer)
- goto err;
- }
- /* We have parameters now set public key */
- plen = ASN1_STRING_length(pubkey);
- p = ASN1_STRING_get0_data(pubkey);
- if (p == NULL || plen == 0)
- goto err;
- if (!o2i_ECPublicKey(&ecpeer, &p, plen))
- goto err;
- pkpeer = EVP_PKEY_new();
- if (pkpeer == NULL)
- goto err;
- EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
- if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
- rv = 1;
- err:
- EC_KEY_free(ecpeer);
- 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_63) <= 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;
- EVP_CIPHER *kekcipher = NULL;
- EVP_CIPHER_CTX *kekctx;
- const char *name;
-
- 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 == NULL)
- goto err;
- kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
- if (kekctx == NULL)
- goto err;
- name = OBJ_nid2sn(OBJ_obj2nid(kekalg->algorithm));
- kekcipher = EVP_CIPHER_fetch(pctx->libctx, name, pctx->propquery);
- if (kekcipher == NULL || 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 <= 0)
- goto err;
-
- if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
- goto err;
- der = NULL;
-
- rv = 1;
- err:
- EVP_CIPHER_free(kekcipher);
- X509_ALGOR_free(kekalg);
- 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 == NULL)
- 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;
- const 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 == NULL)
- 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 == NULL)
- 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 parameters 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_63;
- if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
- goto err;
- } else
- /* Unknown 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 == NULL)
- goto err;
- wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
- wrap_alg->parameter = ASN1_TYPE_new();
- if (wrap_alg->parameter == NULL)
- 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 == NULL)
- 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:
- OPENSSL_free(penc);
- X509_ALGOR_free(wrap_alg);
- return rv;
-}
-
-#endif
projects / openssl.git / blobdiff