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package org.spongycastle.cms;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Set;
import org.spongycastle.asn1.cms.KEKRecipientInfo;
import org.spongycastle.asn1.cms.KeyAgreeRecipientInfo;
import org.spongycastle.asn1.cms.KeyTransRecipientInfo;
import org.spongycastle.asn1.cms.PasswordRecipientInfo;
import org.spongycastle.asn1.cms.RecipientInfo;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.operator.DigestCalculator;
import org.spongycastle.util.Integers;
class CMSEnvelopedHelper
{
static final CMSEnvelopedHelper INSTANCE = new CMSEnvelopedHelper();
private static final Map KEYSIZES = new HashMap();
private static final Map BASE_CIPHER_NAMES = new HashMap();
private static final Map CIPHER_ALG_NAMES = new HashMap();
private static final Map MAC_ALG_NAMES = new HashMap();
static
{
KEYSIZES.put(CMSEnvelopedGenerator.DES_EDE3_CBC, Integers.valueOf(192));
KEYSIZES.put(CMSEnvelopedGenerator.AES128_CBC, Integers.valueOf(128));
KEYSIZES.put(CMSEnvelopedGenerator.AES192_CBC, Integers.valueOf(192));
KEYSIZES.put(CMSEnvelopedGenerator.AES256_CBC, Integers.valueOf(256));
BASE_CIPHER_NAMES.put(CMSEnvelopedGenerator.DES_EDE3_CBC, "DESEDE");
BASE_CIPHER_NAMES.put(CMSEnvelopedGenerator.AES128_CBC, "AES");
BASE_CIPHER_NAMES.put(CMSEnvelopedGenerator.AES192_CBC, "AES");
BASE_CIPHER_NAMES.put(CMSEnvelopedGenerator.AES256_CBC, "AES");
CIPHER_ALG_NAMES.put(CMSEnvelopedGenerator.DES_EDE3_CBC, "DESEDE/CBC/PKCS5Padding");
CIPHER_ALG_NAMES.put(CMSEnvelopedGenerator.AES128_CBC, "AES/CBC/PKCS5Padding");
CIPHER_ALG_NAMES.put(CMSEnvelopedGenerator.AES192_CBC, "AES/CBC/PKCS5Padding");
CIPHER_ALG_NAMES.put(CMSEnvelopedGenerator.AES256_CBC, "AES/CBC/PKCS5Padding");
MAC_ALG_NAMES.put(CMSEnvelopedGenerator.DES_EDE3_CBC, "DESEDEMac");
MAC_ALG_NAMES.put(CMSEnvelopedGenerator.AES128_CBC, "AESMac");
MAC_ALG_NAMES.put(CMSEnvelopedGenerator.AES192_CBC, "AESMac");
MAC_ALG_NAMES.put(CMSEnvelopedGenerator.AES256_CBC, "AESMac");
}
int getKeySize(String oid)
{
Integer keySize = (Integer)KEYSIZES.get(oid);
if (keySize == null)
{
throw new IllegalArgumentException("no keysize for " + oid);
}
return keySize.intValue();
}
static RecipientInformationStore buildRecipientInformationStore(
ASN1Set recipientInfos, AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable)
{
return buildRecipientInformationStore(recipientInfos, messageAlgorithm, secureReadable, null);
}
static RecipientInformationStore buildRecipientInformationStore(
ASN1Set recipientInfos, AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
{
List infos = new ArrayList();
for (int i = 0; i != recipientInfos.size(); i++)
{
RecipientInfo info = RecipientInfo.getInstance(recipientInfos.getObjectAt(i));
readRecipientInfo(infos, info, messageAlgorithm, secureReadable, additionalData);
}
return new RecipientInformationStore(infos);
}
private static void readRecipientInfo(
List infos, RecipientInfo info, AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
{
ASN1Encodable recipInfo = info.getInfo();
if (recipInfo instanceof KeyTransRecipientInfo)
{
infos.add(new KeyTransRecipientInformation(
(KeyTransRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData));
}
else if (recipInfo instanceof KEKRecipientInfo)
{
infos.add(new KEKRecipientInformation(
(KEKRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData));
}
else if (recipInfo instanceof KeyAgreeRecipientInfo)
{
KeyAgreeRecipientInformation.readRecipientInfo(infos,
(KeyAgreeRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData);
}
else if (recipInfo instanceof PasswordRecipientInfo)
{
infos.add(new PasswordRecipientInformation(
(PasswordRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData));
}
}
static class CMSDigestAuthenticatedSecureReadable
implements CMSSecureReadable
{
private DigestCalculator digestCalculator;
private CMSReadable readable;
public CMSDigestAuthenticatedSecureReadable(DigestCalculator digestCalculator, CMSReadable readable)
{
this.digestCalculator = digestCalculator;
this.readable = readable;
}
public InputStream getInputStream()
throws IOException, CMSException
{
return new FilterInputStream(readable.getInputStream())
{
public int read()
throws IOException
{
int b = in.read();
if (b >= 0)
{
digestCalculator.getOutputStream().write(b);
}
return b;
}
public int read(byte[] inBuf, int inOff, int inLen)
throws IOException
{
int n = in.read(inBuf, inOff, inLen);
if (n >= 0)
{
digestCalculator.getOutputStream().write(inBuf, inOff, n);
}
return n;
}
};
}
public byte[] getDigest()
{
return digestCalculator.getDigest();
}
}
static class CMSAuthenticatedSecureReadable implements CMSSecureReadable
{
private AlgorithmIdentifier algorithm;
private CMSReadable readable;
CMSAuthenticatedSecureReadable(AlgorithmIdentifier algorithm, CMSReadable readable)
{
this.algorithm = algorithm;
this.readable = readable;
}
public InputStream getInputStream()
throws IOException, CMSException
{
return readable.getInputStream();
}
}
static class CMSEnvelopedSecureReadable implements CMSSecureReadable
{
private AlgorithmIdentifier algorithm;
private CMSReadable readable;
CMSEnvelopedSecureReadable(AlgorithmIdentifier algorithm, CMSReadable readable)
{
this.algorithm = algorithm;
this.readable = readable;
}
public InputStream getInputStream()
throws IOException, CMSException
{
return readable.getInputStream();
}
}
}
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