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This commit is contained in:
Paul Schaub 2021-11-28 14:45:53 +01:00
parent 5364e21b5e
commit aef9ebfd7b
1 changed files with 43 additions and 11 deletions
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54
pgpainless-core/src/main/java/org/pgpainless/key/util/PublicKeyParameterValidationUtil.java
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@ -42,16 +42,6 @@ public class PublicKeyParameterValidationUtil {
throws KeyIntegrityException, PGPException {
PublicKeyAlgorithm publicKeyAlgorithm = PublicKeyAlgorithm.fromId(publicKey.getAlgorithm());
boolean valid = true;
// Additional to the algorithm-specific tests further below, we also perform
// generic functionality tests with the key, such as whether it is able to decrypt encrypted data
// or verify signatures.
// These tests should be more or less constant time.
if (publicKeyAlgorithm.isSigningCapable()) {
valid = verifyCanSign(privateKey, publicKey) && valid;
}
if (publicKeyAlgorithm.isEncryptionCapable()) {
valid = verifyCanDecrypt(privateKey, publicKey) && valid;
}
// Algorithm specific validations
BCPGKey key = privateKey.getPrivateKeyDataPacket();
@ -77,6 +67,21 @@ public class PublicKeyParameterValidationUtil {
if (!valid) {
throw new KeyIntegrityException();
}
// Additional to the algorithm-specific tests further above, we also perform
// generic functionality tests with the key, such as whether it is able to decrypt encrypted data
// or verify signatures.
// These tests should be more or less constant time.
if (publicKeyAlgorithm.isSigningCapable()) {
valid = verifyCanSign(privateKey, publicKey);
}
if (publicKeyAlgorithm.isEncryptionCapable()) {
valid = verifyCanDecrypt(privateKey, publicKey) && valid;
}
if (!valid) {
throw new KeyIntegrityException();
}
}
private static boolean verifyCanSign(PGPPrivateKey privateKey, PGPPublicKey publicKey) throws PGPException {
@ -149,19 +154,46 @@ public class PublicKeyParameterValidationUtil {
BigInteger sX = privateKey.getX();
boolean pPrime = pP.isProbablePrime(certainty);
if (!pPrime) {
return false;
}
boolean qPrime = pQ.isProbablePrime(certainty);
if (!qPrime) {
return false;
}
// q > 160 bits
boolean qLarge = pQ.getLowestSetBit() > 160;
if (!qLarge) {
return false;
}
// q divides p - 1
boolean qDividesPminus1 = pP.subtract(BigInteger.ONE).mod(pQ).equals(BigInteger.ZERO);
if (!qDividesPminus1) {
return false;
}
// 1 < g < p
boolean gInBounds = BigInteger.ONE.max(pG).equals(pG) && pG.max(pP).equals(pP);
if (!gInBounds) {
return false;
}
// g^q = 1 mod p
boolean gPowXModPEquals1 = pG.modPow(pQ, pP).equals(BigInteger.ONE);
if (!gPowXModPEquals1) {
return false;
}
// y = g^x mod p
boolean yEqualsGPowXModP = pY.equals(pG.modPow(sX, pP));
if (!yEqualsGPowXModP) {
return false;
}
return pPrime && qPrime && qLarge && qDividesPminus1 && gInBounds && gPowXModPEquals1 && yEqualsGPowXModP;
return true;
}
private static boolean verifyRSAKeyIntegrity(RSASecretBCPGKey secretKey, RSAPublicBCPGKey publicKey)