1 files changed, 94 insertions, 0 deletions
diff --git a/src/lib/crypto/krb/make_checksum_iov.c b/src/lib/crypto/krb/make_checksum_iov.c
new file mode 100644
index 0000000000000..549180df515aa
--- /dev/null
+++ b/src/lib/crypto/krb/make_checksum_iov.c
@@ -0,0 +1,94 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/crypto/krb/make_checksum_iov.c */
+/*
+ * Copyright 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+#include "crypto_int.h"
+
+krb5_error_code KRB5_CALLCONV
+krb5_k_make_checksum_iov(krb5_context context,
+                         krb5_cksumtype cksumtype,
+                         krb5_key key,
+                         krb5_keyusage usage,
+                         krb5_crypto_iov *data,
+                         size_t num_data)
+{
+    krb5_error_code ret;
+    krb5_data cksum_data;
+    krb5_crypto_iov *checksum;
+    const struct krb5_cksumtypes *ctp;
+
+    if (cksumtype == 0) {
+        ret = krb5int_c_mandatory_cksumtype(context, key->keyblock.enctype,
+                                            &cksumtype);
+        if (ret != 0)
+            return ret;
+    }
+    ctp = find_cksumtype(cksumtype);
+    if (ctp == NULL)
+        return KRB5_BAD_ENCTYPE;
+
+    ret = verify_key(ctp, key);
+    if (ret != 0)
+        return ret;
+
+    checksum = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
+    if (checksum == NULL || checksum->data.length < ctp->output_size)
+        return(KRB5_BAD_MSIZE);
+
+    ret = alloc_data(&cksum_data, ctp->compute_size);
+    if (ret != 0)
+        return ret;
+
+    ret = ctp->checksum(ctp, key, usage, data, num_data, &cksum_data);
+    if (ret != 0)
+        goto cleanup;
+
+    memcpy(checksum->data.data, cksum_data.data, ctp->output_size);
+    checksum->data.length = ctp->output_size;
+
+cleanup:
+    zapfree(cksum_data.data, ctp->compute_size);
+    return ret;
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_c_make_checksum_iov(krb5_context context,
+                         krb5_cksumtype cksumtype,
+                         const krb5_keyblock *keyblock,
+                         krb5_keyusage usage,
+                         krb5_crypto_iov *data,
+                         size_t num_data)
+{
+    krb5_key key;
+    krb5_error_code ret;
+
+    ret = krb5_k_create_key(context, keyblock, &key);
+    if (ret != 0)
+        return ret;
+    ret = krb5_k_make_checksum_iov(context, cksumtype, key, usage,
+                                   data, num_data);
+    krb5_k_free_key(context, key);
+    return ret;
+}