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diff --git a/scripts/keygeneration/common.sh b/scripts/keygeneration/common.sh
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+++ b/scripts/keygeneration/common.sh
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+#!/bin/bash
+# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Common key generation functions.
+
+SCRIPT_DIR="$(dirname "$0")"
+
+# 0 = (RSA1024 SHA1)
+# 1 = (RSA1024 SHA256)
+# 2 = (RSA1024 SHA512)
+# 3 = (RSA2048 SHA1)
+# 4 = (RSA2048 SHA256)
+# 5 = (RSA2048 SHA512)
+# 6 = (RSA4096 SHA1)
+# 7 = (RSA4096 SHA256)
+# 8 = (RSA4096 SHA512)
+# 9 = (RSA8192 SHA1)
+# 10 = (RSA8192 SHA256)
+# 11 = (RSA8192 SHA512)
+function alg_to_keylen {
+  echo $(( 1 << (10 + ($1 / 3)) ))
+}
+
+# Emit .vbpubk and .vbprivk using given basename and algorithm
+# NOTE: This function also appears in ../../utility/dev_make_keypair. Making
+# the two implementations the same would require some common.sh, which is more
+# likely to cause problems than just keeping an eye out for any differences. If
+# you feel the need to change this file, check the history of that other file
+# to see what may need updating here too.
+function make_pair {
+  local base=$1
+  local alg=$2
+  local len=$(alg_to_keylen $alg)
+
+  echo "creating $base keypair..."
+
+  # make the RSA keypair
+  openssl genrsa -F4 -out "${base}_${len}.pem" $len
+  # create a self-signed certificate
+  openssl req -batch -new -x509 -key "${base}_${len}.pem" \
+    -out "${base}_${len}.crt"
+  # generate pre-processed RSA public key
+  dumpRSAPublicKey -cert "${base}_${len}.crt" > "${base}_${len}.keyb"
+
+  # wrap the public key
+  vbutil_key \
+    --pack "${base}.vbpubk" \
+    --key "${base}_${len}.keyb" \
+    --version 1 \
+    --algorithm $alg
+
+  # wrap the private key
+  vbutil_key \
+    --pack "${base}.vbprivk" \
+    --key "${base}_${len}.pem" \
+    --algorithm $alg
+
+  # remove intermediate files
+  rm -f "${base}_${len}.pem" "${base}_${len}.crt" "${base}_${len}.keyb"
+}
+
+
+# Emit a .keyblock containing flags and a public key, signed by a private key
+# flags are the bitwise OR of these (passed in decimal, though)
+#   0x01  Developer switch off
+#   0x02  Developer switch on
+#   0x04  Not recovery mode
+#   0x08  Recovery mode
+function make_keyblock {
+  local base=$1
+  local flags=$2
+  local pubkey=$3
+  local signkey=$4
+
+  echo "creating $base keyblock..."
+
+  # create it
+  vbutil_keyblock \
+    --pack "${base}.keyblock" \
+    --flags $flags \
+    --datapubkey "${pubkey}.vbpubk" \
+    --signprivate "${signkey}.vbprivk"
+
+  # verify it
+  vbutil_keyblock \
+    --unpack "${base}.keyblock" \
+    --signpubkey "${signkey}.vbpubk"
+}
+
+