1 files changed, 56 insertions, 0 deletions
diff --git a/src/lib/crypto/builtin/hash_provider/hash_crc32.c b/src/lib/crypto/builtin/hash_provider/hash_crc32.c
new file mode 100644
index 000000000000..1d0be55637a9
--- /dev/null
+++ b/src/lib/crypto/builtin/hash_provider/hash_crc32.c
@@ -0,0 +1,56 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * 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 FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  FundsXpress makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include "crypto_int.h"
+
+static krb5_error_code
+k5_crc32_hash(const krb5_crypto_iov *data, size_t num_data, krb5_data *output)
+{
+    unsigned long c;
+    unsigned int i;
+
+    if (output->length != CRC32_CKSUM_LENGTH)
+        return KRB5_CRYPTO_INTERNAL;
+
+    c = 0;
+    for (i = 0; i < num_data; i++) {
+        const krb5_crypto_iov *iov = &data[i];
+
+        if (SIGN_IOV(iov))
+            mit_crc32(iov->data.data, iov->data.length, &c);
+    }
+
+    store_32_le(c, output->data);
+    return 0;
+}
+
+const struct krb5_hash_provider krb5int_hash_crc32 = {
+    "CRC32",
+    CRC32_CKSUM_LENGTH,
+    1,
+    k5_crc32_hash
+};