Add support of the 1000 bytes chunking of asn1-octets to unmarshal th…

…e rest until its completeted.

pkcs7.go

@@ -167,9 +167,24 @@ func parseSignedData(data []byte) (*PKCS7, error) {
 	}
 	// Compound octet string
 	if compound.IsCompound {
-		if _, err = asn1.Unmarshal(compound.Bytes, &content); err != nil {
+		bytesToMarshal := compound.Bytes
+		restOfCompound, err := asn1.Unmarshal(bytesToMarshal, &content)
+		if err != nil {
 			return nil, err
 		}
+		for {
+			if len(restOfCompound) > 0 {
+				var contentPart []byte
+				bytesToMarshal = restOfCompound
+				restOfCompound, err = asn1.Unmarshal(bytesToMarshal, &contentPart)
+				if err != nil {
+					return nil, err
+				}
+				content = append(content, contentPart...)
+			} else {
+				break
+			}
+		}
 	} else {
 		// assuming this is tag 04
 		content = compound.Bytes
@@ -301,8 +316,8 @@ func getHashForOID(oid asn1.ObjectIdentifier) (crypto.Hash, error) {
 	switch {
 	case oid.Equal(oidDigestAlgorithmSHA1):
 		return crypto.SHA1, nil
-  case oid.Equal(oidSHA256):
-    return crypto.SHA256, nil
+	case oid.Equal(oidSHA256):
+		return crypto.SHA256, nil
 	}
 	return crypto.Hash(0), ErrUnsupportedAlgorithm
 }