Hey guys,
I'm currently trying to apply an update over the stock android recovery.
I created the zip contents and my own keys for the android build but it
failes with a signature verification error.
I have now found this piece of code in the `bootable/recovery/verifier.cpp`
#define FOOTER_SIZE 6
if (fseek(f, -FOOTER_SIZE, SEEK_END) != 0) {
LOGE("failed to seek in %s (%s)\n", path, strerror(errno));
fclose(f);
return VERIFY_FAILURE;
}
unsigned char footer[FOOTER_SIZE];
if (fread(footer, 1, FOOTER_SIZE, f) != FOOTER_SIZE) {
LOGE("failed to read footer from %s (%s)\n", path, strerror(errno));
fclose(f);
return VERIFY_FAILURE;
}
if (footer[2] != 0xff || footer[3] != 0xff) {
LOGE("failed check of footer bytes 2 & 3 match 0xff");
fclose(f);
return VERIFY_FAILURE;
}
Which expects the 4th and 3rd last byte in the zip to be `0xff`. The
verification failes at this point. If I open the zip with a HexEditor I can
see that both bytes are not `0xff`.
If I open a zip from the `/bootable/recovery/testdata/otasigned*.zip` I can
see that they are `0xff`.
I signed the zip with following command: `jdk1.6.0_35/bin/java -jar
Android/prebuilts/sdk/tools/lib/signapk.jar
Android/build/target/product/security/testkey.x509.pem
Android/build/target/product/security/testkey.pk8 testupdate.zip
update.zip` wich adds some certificate data in the `META-INF` folder.
I couldn't find any information that theese bytes have to be `oxff` on the
zip spec either.
What is going wrong here?
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