Refactor LoadFrmware() to avoid global variables, which don't work when running out of ROM

vboot_firmware/lib/vboot_common.c

Index: vboot_firmware/lib/vboot_common.c
diff --git a/vboot_firmware/lib/vboot_common.c b/vboot_firmware/lib/vboot_common.c
index 1256b676d3e67d12b08352ea1c82d5c488a43619..f76eed45abc0655a93c77099e171773f6365ef0e 100644
--- a/vboot_firmware/lib/vboot_common.c
+++ b/vboot_firmware/lib/vboot_common.c
@@ -85,6 +85,26 @@ int VerifySignatureInside(const void* parent, uint64_t parent_size,
 }
 
 
+void PublicKeyInit(VbPublicKey* key, uint8_t* key_data, uint64_t key_size) {
+  key->key_offset = OffsetOf(key, key_data);
+  key->key_size = key_size;
+  key->algorithm = kNumAlgorithms; /* Key not present yet */
+  key->key_version = 0;
+}
+
+
+int PublicKeyCopy(VbPublicKey* dest, const VbPublicKey* src) {
+  if (dest->key_size < src->key_size)
+    return 1;
+
+  dest->key_size = src->key_size;
+  dest->algorithm = src->algorithm;
+  dest->key_version = src->key_version;
+  Memcpy(GetPublicKeyData(dest), GetPublicKeyDataC(src), src->key_size);
+  return 0;
+}
+
+
 RSAPublicKey* PublicKeyToRSA(const VbPublicKey* key) {
   RSAPublicKey *rsa;