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Administrator
Magisk
Commits
85042fbe
Commit
85042fbe
authored
Jan 16, 2019
by
topjohnwu
Browse files
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Use the least possible memory for boot signing and verification
Close #971, close #966
parent
23e51884
Show whitespace changes
Inline
Side-by-side
Showing
2 changed files
with
84 additions
and
32 deletions
+84
-32
ByteArrayStream.java
utils/src/main/java/com/topjohnwu/utils/ByteArrayStream.java
+4
-8
SignBoot.java
utils/src/main/java/com/topjohnwu/utils/SignBoot.java
+80
-24
No files found.
utils/src/main/java/com/topjohnwu/utils/ByteArrayStream.java
View file @
85042fbe
...
...
@@ -4,20 +4,18 @@ import java.io.ByteArrayInputStream;
import
java.io.ByteArrayOutputStream
;
import
java.io.IOException
;
import
java.io.InputStream
;
import
java.io.OutputStream
;
public
class
ByteArrayStream
extends
ByteArrayOutputStream
{
public
byte
[]
getBuf
()
{
return
buf
;
}
public
synchronized
void
readFrom
(
InputStream
is
)
{
readFrom
(
is
,
Integer
.
MAX_VALUE
);
}
public
synchronized
void
readFrom
(
InputStream
is
,
int
len
)
{
int
read
;
byte
buffer
[]
=
new
byte
[
4096
];
try
{
while
((
read
=
is
.
read
(
buffer
,
0
,
len
<
buffer
.
length
?
len
:
buffer
.
length
))
>
0
)
{
while
((
read
=
is
.
read
(
buffer
,
0
,
Math
.
min
(
len
,
buffer
.
length
)
))
>
0
)
{
write
(
buffer
,
0
,
read
);
len
-=
read
;
}
...
...
@@ -25,9 +23,7 @@ public class ByteArrayStream extends ByteArrayOutputStream {
e
.
printStackTrace
();
}
}
public
synchronized
void
writeTo
(
OutputStream
out
,
int
off
,
int
len
)
throws
IOException
{
out
.
write
(
buf
,
off
,
len
);
}
public
ByteArrayInputStream
getInputStream
()
{
return
new
ByteArrayInputStream
(
buf
,
0
,
count
);
}
...
...
utils/src/main/java/com/topjohnwu/utils/SignBoot.java
View file @
85042fbe
...
...
@@ -15,6 +15,7 @@ import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import
org.bouncycastle.jce.provider.BouncyCastleProvider
;
import
java.io.ByteArrayInputStream
;
import
java.io.FilterInputStream
;
import
java.io.IOException
;
import
java.io.InputStream
;
import
java.io.OutputStream
;
...
...
@@ -35,20 +36,62 @@ public class SignBoot {
Security
.
addProvider
(
new
BouncyCastleProvider
());
}
private
static
class
PushBackRWStream
extends
FilterInputStream
{
private
OutputStream
out
;
private
int
pos
=
0
;
private
byte
[]
backBuf
;
PushBackRWStream
(
InputStream
in
,
OutputStream
o
)
{
super
(
in
);
out
=
o
;
}
@Override
public
int
read
()
throws
IOException
{
int
b
;
if
(
backBuf
!=
null
&&
backBuf
.
length
>
pos
)
{
b
=
backBuf
[
pos
++];
}
else
{
b
=
super
.
read
();
out
.
write
(
b
);
}
return
b
;
}
@Override
public
int
read
(
byte
[]
bytes
,
int
off
,
int
len
)
throws
IOException
{
int
read
=
0
;
if
(
backBuf
!=
null
&&
backBuf
.
length
>
pos
)
{
read
=
Math
.
min
(
len
,
backBuf
.
length
-
pos
);
System
.
arraycopy
(
backBuf
,
pos
,
bytes
,
off
,
read
);
pos
+=
read
;
off
+=
read
;
len
-=
read
;
}
if
(
len
>
0
)
{
int
ar
=
super
.
read
(
bytes
,
off
,
len
);
read
+=
ar
;
out
.
write
(
bytes
,
off
,
ar
);
}
return
read
;
}
void
unread
(
byte
[]
buf
)
{
backBuf
=
buf
;
}
}
public
static
boolean
doSignature
(
String
target
,
InputStream
imgIn
,
OutputStream
imgOut
,
InputStream
cert
,
InputStream
key
)
{
try
{
ByteArrayStream
image
=
new
ByteArrayStream
();
image
.
readFrom
(
imgIn
);
int
signableSize
=
getSignableImageSize
(
image
.
getBuf
());
if
(
signableSize
<
image
.
size
())
{
System
.
err
.
println
(
"NOTE: truncating input from "
+
image
.
size
()
+
" to "
+
signableSize
+
" bytes"
);
}
else
if
(
signableSize
>
image
.
size
())
{
throw
new
IllegalArgumentException
(
"Invalid image: too short, expected "
+
signableSize
+
" bytes"
);
}
BootSignature
bootsig
=
new
BootSignature
(
target
,
image
.
size
());
PushBackRWStream
in
=
new
PushBackRWStream
(
imgIn
,
imgOut
);
byte
[]
hdr
=
new
byte
[
1024
];
// First read the header
in
.
read
(
hdr
);
int
signableSize
=
getSignableImageSize
(
hdr
);
// Unread header
in
.
unread
(
hdr
);
BootSignature
bootsig
=
new
BootSignature
(
target
,
signableSize
);
if
(
cert
==
null
)
{
cert
=
SignBoot
.
class
.
getResourceAsStream
(
"/keys/testkey.x509.pem"
);
}
...
...
@@ -58,10 +101,9 @@ public class SignBoot {
key
=
SignBoot
.
class
.
getResourceAsStream
(
"/keys/testkey.pk8"
);
}
PrivateKey
privateKey
=
CryptoUtils
.
readPrivateKey
(
key
);
b
ootsig
.
setSignature
(
bootsig
.
sign
(
privateKey
,
image
.
getBuf
(),
signableSize
),
CryptoUtils
.
getSignatureAlgorithmIdentifier
(
privateKey
));
b
yte
[]
sig
=
bootsig
.
sign
(
privateKey
,
in
,
signableSize
);
bootsig
.
setSignature
(
sig
,
CryptoUtils
.
getSignatureAlgorithmIdentifier
(
privateKey
));
byte
[]
encoded_bootsig
=
bootsig
.
getEncoded
();
image
.
writeTo
(
imgOut
);
imgOut
.
write
(
encoded_bootsig
);
imgOut
.
flush
();
return
true
;
...
...
@@ -73,19 +115,29 @@ public class SignBoot {
public
static
boolean
verifySignature
(
InputStream
imgIn
,
InputStream
certIn
)
{
try
{
ByteArrayStream
image
=
new
ByteArrayStream
();
image
.
readFrom
(
imgIn
);
int
signableSize
=
getSignableImageSize
(
image
.
getBuf
());
if
(
signableSize
>=
image
.
size
())
{
// Read the header for size
byte
[]
hdr
=
new
byte
[
1024
];
if
(
imgIn
.
read
(
hdr
)
!=
hdr
.
length
)
return
false
;
int
signableSize
=
getSignableImageSize
(
hdr
);
// Read the rest of the image
byte
[]
rawImg
=
Arrays
.
copyOf
(
hdr
,
signableSize
);
int
remain
=
signableSize
-
hdr
.
length
;
if
(
imgIn
.
read
(
rawImg
,
hdr
.
length
,
remain
)
!=
remain
)
{
System
.
err
.
println
(
"Invalid image: not signed"
);
return
false
;
}
byte
[]
signature
=
Arrays
.
copyOfRange
(
image
.
getBuf
(),
signableSize
,
image
.
size
());
// Read footer, which contains the signature
byte
[]
signature
=
new
byte
[
4096
];
imgIn
.
read
(
signature
);
BootSignature
bootsig
=
new
BootSignature
(
signature
);
if
(
certIn
!=
null
)
{
bootsig
.
setCertificate
(
CryptoUtils
.
readCertificate
(
certIn
));
}
if
(
bootsig
.
verify
(
image
.
getBuf
()
,
signableSize
))
{
if
(
bootsig
.
verify
(
rawImg
,
signableSize
))
{
System
.
err
.
println
(
"Signature is VALID"
);
return
true
;
}
else
{
...
...
@@ -148,8 +200,7 @@ public class SignBoot {
* Initializes the object for verifying a signed image file
* @param signature Signature footer
*/
public
BootSignature
(
byte
[]
signature
)
throws
Exception
{
public
BootSignature
(
byte
[]
signature
)
throws
Exception
{
ASN1InputStream
stream
=
new
ASN1InputStream
(
signature
);
ASN1Sequence
sequence
=
(
ASN1Sequence
)
stream
.
readObject
();
formatVersion
=
(
ASN1Integer
)
sequence
.
getObjectAt
(
0
);
...
...
@@ -193,10 +244,15 @@ public class SignBoot {
publicKey
=
cert
.
getPublicKey
();
}
public
byte
[]
sign
(
PrivateKey
key
,
byte
[]
image
,
int
length
)
throws
Exception
{
public
byte
[]
sign
(
PrivateKey
key
,
InputStream
is
,
int
len
)
throws
Exception
{
Signature
signer
=
Signature
.
getInstance
(
CryptoUtils
.
getSignatureAlgorithm
(
key
));
signer
.
initSign
(
key
);
signer
.
update
(
image
,
0
,
length
);
int
read
;
byte
buffer
[]
=
new
byte
[
4096
];
while
((
read
=
is
.
read
(
buffer
,
0
,
Math
.
min
(
len
,
buffer
.
length
)))
>
0
)
{
signer
.
update
(
buffer
,
0
,
read
);
len
-=
read
;
}
signer
.
update
(
getEncodedAuthenticatedAttributes
());
return
signer
.
sign
();
}
...
...
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