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8320597: RSA signature verification fails on signed data that does not encode params correctly

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Reviewed-by: mullan, valeriep
This commit is contained in:
Weijun Wang 2023-12-07 23:25:56 +00:00
parent 354ea4c28f
commit 11e4a925be
3 changed files with 76 additions and 23 deletions
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9
src/java.base/share/classes/sun/security/rsa/RSASignature.java
View file

@ -217,8 +217,17 @@ abstract class RSASignature extends SignatureSpi {
byte[] decrypted = RSACore.rsa(sigBytes, publicKey);
byte[] digest = getDigestValue();
byte[] encoded = RSAUtil.encodeSignature(digestOID, digest);
byte[] padded = padding.pad(encoded);
if (MessageDigest.isEqual(padded, decrypted)) {
return true;
}
// Some vendors might omit the NULL params in digest algorithm
// identifier. Try again.
encoded = RSAUtil.encodeSignatureWithoutNULL(digestOID, digest);
padded = padding.pad(encoded);
return MessageDigest.isEqual(padded, decrypted);
} catch (javax.crypto.BadPaddingException e) {
return false;

33
src/java.base/share/classes/sun/security/rsa/RSAUtil.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -180,28 +180,15 @@ public class RSAUtil {
}
/**
* Decode the signature data. Verify that the object identifier matches
* and return the message digest.
* Encode the digest without the NULL params, return the to-be-signed data.
* This is only used by SunRsaSign.
*/
public static byte[] decodeSignature(ObjectIdentifier oid, byte[] sig)
throws IOException {
// Enforce strict DER checking for signatures
DerInputStream in = new DerInputStream(sig, 0, sig.length, false);
DerValue[] values = in.getSequence(2);
if ((values.length != 2) || (in.available() != 0)) {
throw new IOException("SEQUENCE length error");
}
AlgorithmId algId = AlgorithmId.parse(values[0]);
if (!algId.getOID().equals(oid)) {
throw new IOException("ObjectIdentifier mismatch: "
+ algId.getOID());
}
if (algId.getEncodedParams() != null) {
throw new IOException("Unexpected AlgorithmId parameters");
}
if (values[1].isConstructed()) {
throw new IOException("Unexpected constructed digest value");
}
return values[1].getOctetString();
static byte[] encodeSignatureWithoutNULL(ObjectIdentifier oid, byte[] digest) {
DerOutputStream out = new DerOutputStream();
out.write(DerValue.tag_Sequence, new DerOutputStream().putOID(oid));
out.putOctetString(digest);
DerValue result =
new DerValue(DerValue.tag_Sequence, out.toByteArray());
return result.toByteArray();
}
}