1 files changed, 24 insertions, 0 deletions
diff --git a/sha1dc_git.c b/sha1dc_git.c
new file mode 100644
index 000000000..4d32b4f77
--- /dev/null
+++ b/sha1dc_git.c
@@ -0,0 +1,24 @@
+/*
+ * This code is included at the end of sha1dc/sha1.c with the
+ * SHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_C macro.
+ */
+
+void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
+{
+	if (!SHA1DCFinal(hash, ctx))
+		return;
+	die("SHA-1 appears to be part of a collision attack: %s",
+	    sha1_to_hex(hash));
+}
+
+void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
+{
+	const char *data = vdata;
+	/* We expect an unsigned long, but sha1dc only takes an int */
+	while (len > INT_MAX) {
+		SHA1DCUpdate(ctx, data, INT_MAX);
+		data += INT_MAX;
+		len -= INT_MAX;
+	}
+	SHA1DCUpdate(ctx, data, len);
+}