Makefile: add DC_SHA1 knob

diff --git a/sha1dc/sha1.c b/sha1dc/sha1.c
index 8ff2321dfb089985b28dddf84513d76f58865ded..6dd0da3608431f479d3ede195f2d26a91270e5f5 100644 (file)
--- a/sha1dc/sha1.c
+++ b/sha1dc/sha1.c
@@ -1786,3 +1786,23 @@ int SHA1DCFinal(unsigned char output[20], SHA1_CTX *ctx)
        output[19] = (unsigned char)(ctx->ihv[4]);
        return ctx->found_collision;
 }
+
+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);
+}