Digital signatures for embedded code
View Patent ↗Generating a digital signature of an entire embedded code project while maintaining certain exclusion areas so that a productivity application can incorporate application-specific information into the embedded code project without hampering the digital signature.
1. A method for verifying a digital signature, comprising:
reading a digital signature embedded in a document to verify data embedded in the document, wherein reading the digital signature comprises determining a hash value representing an aggregated representative component, the aggregated representative component including at least a first representative component and at least a second representative component, the first representative component being associated with data common to an application used for creating the document and a later version of the application;
calculating a hash value of a data stream representing the data embedded in the document, the data embedded in the document representing the data common to the application; and
comparing the hash value of the data stream to the hash value representing the aggregated representative component to determine whether the data common to the application used for creating the document and the later version of the application has been altered.
2. The method recited in claim 1 , wherein the new data includes a portion having computer-executable instructions.
3. A method for verifying a digital signature, comprising:
reading a digital signature to determine a hash value representing an aggregated representative component including at least a first representative component, the first representative component being associated with data common to plural versions of an application, the plural versions of the application comprising a current version of an application used for creating a document comprising the data and a later version of the application, wherein a portion of the data common to the plural versions of the application comprises a code project comprising embedded executable code to programmatically access functionality of the current version of the application, the code project further comprising at least one of a database query string, forms for displaying a user interface to a user, and meta information defining the code project;
calculating a hash value of a data stream representing embedded code in the document, the embedded code in the document representing the data common to the plural versions of the application; and
comparing the hash value of the data stream to the hash value representing the aggregated representative component to determine whether the data common to the plural versions of the application has been altered.
4. The method recited in claim 3 , wherein the code project includes a portion having computer-executable instructions.
5. The method recited in claim 3 , wherein the new data includes a portion having computer-executable instructions.
6. The method recited in claim 1 , wherein a portion of the data common to the plural versions of the application comprises a code project comprising embedded executable code to programmatically access functionality of a current version of the application, the code project further comprising at least one of a database query string, forms for displaying a user interface to a user, and meta information defining the code project, wherein a portion of the data common to the plural versions of the application is related to the features of the later version of the application and comprises the new data.
7. The method recited in claim 6 , wherein the code project includes a portion having computer-executable instructions.