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-rw-r--r--sha1dc_git.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/sha1dc_git.c b/sha1dc_git.c
new file mode 100644
index 0000000000..4d32b4f77e
--- /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);
+}