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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.mime.smime;

import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.mime.BasicMimeParser;
import org.bouncycastle.mime.Headers;
import org.bouncycastle.mime.MimeParser;
import org.bouncycastle.mime.MimeParserProvider;
import org.bouncycastle.operator.DigestCalculatorProvider;

public class SMimeParserProvider
    implements MimeParserProvider
{
    private final String defaultContentTransferEncoding;
    private final DigestCalculatorProvider digestCalculatorProvider;

    public SMimeParserProvider(String defaultContentTransferEncoding, DigestCalculatorProvider digestCalculatorProvider)
    {
        this.defaultContentTransferEncoding = defaultContentTransferEncoding;
        this.digestCalculatorProvider = digestCalculatorProvider;
    }

    public MimeParser createParser(InputStream source)
        throws IOException
    {
        return new BasicMimeParser(new SMimeParserContext(defaultContentTransferEncoding, digestCalculatorProvider),
            SMimeUtils.autoBuffer(source));
    }

    public MimeParser createParser(Headers headers, InputStream source)
        throws IOException
    {
        return new BasicMimeParser(new SMimeParserContext(defaultContentTransferEncoding, digestCalculatorProvider),
            headers, SMimeUtils.autoBuffer(source));
    }
}