How to parse the ASN1 data by using bouncycastle

user_698070 0
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I have the byte array which is in the form of asn1 format..now i want to parse this data to get required information..Here is the code they have written for c++..now i want to do the same in java.could any one help on this.

ASN1 asn1(in); 

 int startPos = in.tellg();
 asn1.enterObject(asn1.getTag());
 int endPos = asn1.getCurrentLength() + in.tellg();

 ubytearray acctId, valData;

 while (in.tellg() < endPos) {
     asn1.enterObject(0x30); //0x30 TAG_SEQ

     // read the name
     ubytearray nameData = asn1.getContent(ASN1_TAG_UTF8_STRING);
     ubytearray octstr =  asn1.getContent(ASN1_TAG_OCTET_STRING);

ASN1 asn2(octstr); asn2.enterObject(0x30); ustring urlstr(asn2.getContent(ASN1_TAG_UTF8_STRING)); ustring nameStr(asn2.getContent(ASN1_TAG_UTF8_STRING)); asn2.enterObject(0x30); ubytearray certs = asn2.getContent(ASN1_TAG_OCTET_STRING);

     if ((urlstr.length() > 0)  && (nameStr.length() > 0) && (certs.length() > 0)) {
         printf("url %s\n", urlstr.c_str());
         printf("name %s\n", nameStr.c_str());
         printf("certs len:%d\n", certs.length());

} }

bouncycastle java
2 Answers

For PEM-encoded signatures you may use

String signaturePem = "-----BEGIN PKCS7-----\n...";
PEMParser parser = new PEMParser(new StringReader(signaturePem));
ContentInfo contentInfo = (ContentInfo) parser.readObject();
CMSSignedData signedData = new CMSSignedData(contentInfo);
...
user_20535800
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