- {
- 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;
- }
+{
+ 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 == 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 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 == 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;
+}