1 files changed, 82 insertions, 0 deletions
diff --git a/lib/libcrypto/cms/cms_cd.c b/lib/libcrypto/cms/cms_cd.c
new file mode 100644
index 00000000000..f05e308418f
--- /dev/null
+++ b/lib/libcrypto/cms/cms_cd.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include "internal/cryptlib.h"
+#include <openssl/asn1t.h>
+#include <openssl/pem.h>
+#include <openssl/x509v3.h>
+#include <openssl/err.h>
+#include <openssl/cms.h>
+#include <openssl/bio.h>
+#include <openssl/comp.h>
+#include "cms_lcl.h"
+
+#ifdef ZLIB
+
+/* CMS CompressedData Utilities */
+
+CMS_ContentInfo *cms_CompressedData_create(int comp_nid)
+{
+    CMS_ContentInfo *cms;
+    CMS_CompressedData *cd;
+    /*
+     * Will need something cleverer if there is ever more than one
+     * compression algorithm or parameters have some meaning...
+     */
+    if (comp_nid != NID_zlib_compression) {
+        CMSerr(CMS_F_CMS_COMPRESSEDDATA_CREATE,
+               CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
+        return NULL;
+    }
+    cms = CMS_ContentInfo_new();
+    if (cms == NULL)
+        return NULL;
+
+    cd = M_ASN1_new_of(CMS_CompressedData);
+
+    if (cd == NULL)
+        goto err;
+
+    cms->contentType = OBJ_nid2obj(NID_id_smime_ct_compressedData);
+    cms->d.compressedData = cd;
+
+    cd->version = 0;
+
+    X509_ALGOR_set0(cd->compressionAlgorithm,
+                    OBJ_nid2obj(NID_zlib_compression), V_ASN1_UNDEF, NULL);
+
+    cd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
+
+    return cms;
+
+ err:
+    CMS_ContentInfo_free(cms);
+    return NULL;
+}
+
+BIO *cms_CompressedData_init_bio(CMS_ContentInfo *cms)
+{
+    CMS_CompressedData *cd;
+    const ASN1_OBJECT *compoid;
+    if (OBJ_obj2nid(cms->contentType) != NID_id_smime_ct_compressedData) {
+        CMSerr(CMS_F_CMS_COMPRESSEDDATA_INIT_BIO,
+               CMS_R_CONTENT_TYPE_NOT_COMPRESSED_DATA);
+        return NULL;
+    }
+    cd = cms->d.compressedData;
+    X509_ALGOR_get0(&compoid, NULL, NULL, cd->compressionAlgorithm);
+    if (OBJ_obj2nid(compoid) != NID_zlib_compression) {
+        CMSerr(CMS_F_CMS_COMPRESSEDDATA_INIT_BIO,
+               CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
+        return NULL;
+    }
+    return BIO_new(BIO_f_zlib());
+}
+
+#endif