- {
- 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, *dukm = NULL;
- int penclen;
- size_t dukmlen = 0;
- int rv = 0;
- int kdf_type, 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))
- {
- ASN1_INTEGER *pubk;
- pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
- if (!pubk)
- goto err;
- /* Set the key */
-
- penclen = i2d_ASN1_INTEGER(pubk, &penc);
- ASN1_INTEGER_free(pubk);
- 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_dhpublicnumber),
- V_ASN1_UNDEF, NULL);
- }
-
- /* See if custom paraneters set */
- kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
- if (kdf_type <= 0)
- goto err;
- if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
- goto err;
-
- if (kdf_type == EVP_PKEY_DH_KDF_NONE)
- {
- kdf_type = EVP_PKEY_DH_KDF_X9_42;
- if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
- goto err;
- }
- else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
- /* Unknown KDF */
- goto err;
- if (kdf_md == NULL)
- {
- /* Only SHA1 supported */
- kdf_md = EVP_sha1();
- if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
- goto err;
- }
- else if (EVP_MD_type(kdf_md) != NID_sha1)
- /* Unsupported digest */
- goto err;
-
- if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
- goto err;
-
- /* Get wrap NID */
- ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
- wrap_nid = EVP_CIPHER_CTX_type(ctx);
- if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
- goto err;
- 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_dh_kdf_outlen(pctx, keylen) <= 0)
- goto err;
-
- if (ukm)
- {
- dukmlen = ASN1_STRING_length(ukm);
- dukm = BUF_memdup(ASN1_STRING_data(ukm), dukmlen);
- if (!dukm)
- goto err;
- }
-
- if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
- goto err;
- dukm = NULL;
-
- /* Now need to wrap encoding of wrap AlgorithmIdentifier into
- * parameter of another AlgorithmIdentifier.
- */
- penc = NULL;
- 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(NID_id_smime_alg_ESDH),
- 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;
+ const ASN1_OBJECT *aoid;
+ ASN1_BIT_STRING *pubkey;
+ ASN1_STRING *wrap_str;
+ ASN1_OCTET_STRING *ukm;
+ unsigned char *penc = NULL, *dukm = NULL;
+ int penclen;
+ size_t dukmlen = 0;
+ int rv = 0;
+ int kdf_type, 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)) {
+ ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
+
+ if (pubk == NULL)
+ goto err;
+ /* Set the key */
+
+ penclen = i2d_ASN1_INTEGER(pubk, &penc);
+ ASN1_INTEGER_free(pubk);
+ 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_dhpublicnumber),
+ V_ASN1_UNDEF, NULL);
+ }
+
+ /* See if custom parameters set */
+ kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
+ if (kdf_type <= 0)
+ goto err;
+ if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
+ goto err;
+
+ if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
+ kdf_type = EVP_PKEY_DH_KDF_X9_42;
+ if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
+ goto err;
+ } else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
+ /* Unknown KDF */
+ goto err;
+ if (kdf_md == NULL) {
+ /* Only SHA1 supported */
+ kdf_md = EVP_sha1();
+ if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
+ goto err;
+ } else if (EVP_MD_type(kdf_md) != NID_sha1)
+ /* Unsupported digest */
+ goto err;
+
+ if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
+ goto err;
+
+ /* Get wrap NID */
+ ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
+ wrap_nid = EVP_CIPHER_CTX_type(ctx);
+ if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
+ goto err;
+ 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_dh_kdf_outlen(pctx, keylen) <= 0)
+ goto err;
+
+ if (ukm) {
+ dukmlen = ASN1_STRING_length(ukm);
+ dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
+ if (!dukm)
+ goto err;
+ }
+
+ if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
+ goto err;
+ dukm = NULL;
+
+ /*
+ * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
+ * of another AlgorithmIdentifier.
+ */
+ penc = NULL;
+ penclen = i2d_X509_ALGOR(wrap_alg, &penc);
+ if (penc == NULL || penclen == 0)
+ 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(NID_id_smime_alg_ESDH),
+ V_ASN1_SEQUENCE, wrap_str);
+
+ rv = 1;
+
+ err:
+ OPENSSL_free(penc);
+ X509_ALGOR_free(wrap_alg);
+ OPENSSL_free(dukm);
+ return rv;
+}