Add basic checksum algorithms

The SHA-1 and MD5 digests here are used for checksums in legacy
protocols. We don't use them in cryptographic contexts at all.
These particular algorithms would be poor choices for that.

1 files changed, 60 insertions, 0 deletions

diff --git a/common/checksum.h b/common/checksum.h
new file mode 100644
index 0000000..c688398
--- /dev/null
+++ b/common/checksum.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2012 Red Hat Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *     * Redistributions of source code must retain the above
+ *       copyright notice, this list of conditions and the
+ *       following disclaimer.
+ *     * Redistributions in binary form must reproduce the
+ *       above copyright notice, this list of conditions and
+ *       the following disclaimer in the documentation and/or
+ *       other materials provided with the distribution.
+ *     * The names of contributors to this software may not be
+ *       used to endorse or promote products derived from this
+ *       software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Author: Stef Walter <stefw@redhat.com>
+ */
+
+#ifndef P11_CHECKSUM_H_
+#define P11_CHECKSUM_H_
+
+#include "compat.h"
+
+/*
+ * The SHA-1 and MD5 digests here are used for checksums in legacy
+ * protocols. We don't use them in cryptographic contexts at all.
+ * These particular algorithms would be poor choices for that.
+ */
+
+#define P11_CHECKSUM_SHA1_LENGTH 20
+
+#define P11_CHECKSUM_MD5_LENGTH 16
+
+void     p11_checksum_md5       (unsigned char *checksum,
+                                 const void *input,
+                                 size_t length,
+                                 ...) GNUC_NULL_TERMINATED;
+
+void     p11_checksum_sha1      (unsigned char *checksum,
+                                 const void *input,
+                                 size_t length,
+                                 ...) GNUC_NULL_TERMINATED;
+
+#endif /* P11_CHECKSUM_H_ */