From 5793b30ce81b959add54b02fee952278c499295f Mon Sep 17 00:00:00 2001 From: Alexander Rossmanith Date: Fri, 7 Aug 2026 20:07:29 +0530 Subject: [PATCH] insert document header --- hashtool.code-workspace | 8 ++ poetry.lock | 243 +++++++++++++++++++++++++++++++++++++ pyproject.toml | 23 ++++ scripts/Install-Python.ps1 | 3 + scripts/Install-Scoop.ps1 | 2 + src/hashtool/__init__.py | 0 src/hashtool/docutil.py | 96 +++++++++++++++ src/hashtool/hash.py | 16 +++ src/hashtool/main.py | 66 ++++++++++ tests/__init__.py | 0 tests/test_hash.py | 14 +++ 11 files changed, 471 insertions(+) create mode 100644 hashtool.code-workspace create mode 100644 poetry.lock create mode 100644 pyproject.toml create mode 100644 scripts/Install-Python.ps1 create mode 100644 scripts/Install-Scoop.ps1 create mode 100644 src/hashtool/__init__.py create mode 100644 src/hashtool/docutil.py create mode 100644 src/hashtool/hash.py create mode 100644 src/hashtool/main.py create mode 100644 tests/__init__.py create mode 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"0.1.0" +description = "A short description of hashtool" +authors = [ + {name = "Alexander Rossmanith", email = "hashtool@alexander-rossmanith.de"} +] +readme = "README.md" +requires-python = ">=3.13" +dependencies = [ + "python-docx (>=1.2.0,<2.0.0)" +] + +[tool.poetry] +package-mode = false +packages = [{include = "hashtool", from = "src"}] + +[tool.poetry.group.dev.dependencies] +flake8 = "^7.3.0" + +[build-system] +requires = ["poetry-core>=2.0.0,<3.0.0"] +build-backend = "poetry.core.masonry.api" diff --git a/scripts/Install-Python.ps1 b/scripts/Install-Python.ps1 new file mode 100644 index 0000000..9987f24 --- /dev/null +++ b/scripts/Install-Python.ps1 @@ -0,0 +1,3 @@ +scoop install python +scoop install pipx +pipx install poetry diff --git a/scripts/Install-Scoop.ps1 b/scripts/Install-Scoop.ps1 new file mode 100644 index 0000000..e5594f6 --- /dev/null +++ b/scripts/Install-Scoop.ps1 @@ -0,0 +1,2 @@ +Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser +Invoke-RestMethod -Uri https://get.scoop.sh | Invoke-Expression diff --git a/src/hashtool/__init__.py b/src/hashtool/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/src/hashtool/docutil.py b/src/hashtool/docutil.py new file mode 100644 index 0000000..90534ce --- /dev/null +++ b/src/hashtool/docutil.py @@ -0,0 +1,96 @@ +import docx + + +def make_document(): + doc = docx.Document() + + # A4 size with 25mm margin + page_width = docx.shared.Mm(210) + page_height = docx.shared.Mm(297) + margin = docx.shared.Mm(25) + section = doc.sections[0] + section.page_height = page_height + section.page_width = page_width + section.top_margin = margin + section.bottom_margin = margin + section.left_margin = margin + section.right_margin = margin + + # default style + style = doc.styles['Normal'] + style.font.name = 'Arial' + style.font.size = docx.shared.Pt(11) + + return doc + + +def set_pageheader(section, text): + header = section.header + header.is_linked_to_previous = False + header_para = header.paragraphs[0] + header_para.text = text + + +def set_pagenum_footer(section): + footer = section.footer + footer.is_linked_to_previous = False + footer_para = footer.paragraphs[0] + footer_para.alignment = docx.enum.text.WD_PARAGRAPH_ALIGNMENT.RIGHT + run = footer_para.add_run() + run.add_text("Page ") + add_field(run, "PAGE") + run.add_text(" of ") + add_field(run, "NUMPAGES") + + +def set_headercell(cell, text, width): + cell.text = text + cell.width = width + paragraph = cell.paragraphs[0] + paragraph.runs[0].font.bold = False + paragraph.runs[0].font.size = docx.shared.Pt(14) + paragraph.paragraph_format.space_before = docx.shared.Pt(5) + cell.paragraphs[0].paragraph_format.space_after = docx.shared.Pt(5) + + +def set_bodycell(cell, text, width): + cell.text = text + cell.width = width + paragraph = cell.paragraphs[0] + paragraph.paragraph_format.space_before = docx.shared.Pt(5) + paragraph.paragraph_format.space_after = docx.shared.Pt(5) + + +def create_oxml_element(name): + return docx.oxml.OxmlElement(name) + + +def set_oxml_attribute(element, attribkey, attribval): + element.set(docx.oxml.ns.qn(attribkey), attribval) + + +def create_oxml_element_with_attributes(elemname, attributes): + element = create_oxml_element(elemname) + for key, value in attributes.items(): + set_oxml_attribute(element, key, value) + return element + + +def create_complex_field_begin(): + return create_oxml_element_with_attributes('w:fldChar', {'w:fldCharType': 'begin'}) + + +def create_complex_field_end(): + return create_oxml_element_with_attributes('w:fldChar', {'w:fldCharType': 'end'}) + + +def create_oxml_instruction_text(instruction): + el = create_oxml_element_with_attributes('w:instrText', {'xml:space': 'preserve'}) + el.text = instruction + return el + + +def add_field(run, field): + run._r.append(create_complex_field_begin()) + run._r.append(create_oxml_instruction_text(field)) + run._r.append(create_complex_field_end()) diff --git a/src/hashtool/hash.py b/src/hashtool/hash.py new file mode 100644 index 0000000..39202ba --- /dev/null +++ b/src/hashtool/hash.py @@ -0,0 +1,16 @@ +def filehashes(path, hashalgos): + """ + Computes hash values for the data in a file using the hash algorithms in hashalgos. + + Args: + path: the path of the file to be examined + + Returns: + dict string -> string containing the hexdigests of all hash algorithms + """ + chunksize = 65536 + with open(path, "rb") as file: + for chunk in iter(lambda: file.read(chunksize), b""): + for hashname, hashalgo in hashalgos.items(): + hashalgo.update(chunk) + return {hashname: hashalgo.hexdigest() for hashname, hashalgo in hashalgos.items()} diff --git a/src/hashtool/main.py b/src/hashtool/main.py new file mode 100644 index 0000000..3358250 --- /dev/null +++ b/src/hashtool/main.py @@ -0,0 +1,66 @@ +import collections +import hashlib +import pathlib + +import docx + +import hashtool.docutil +import hashtool.hash + +# https://indianlawlive.net/2025/06/29/sakshya-adhiniyam-doesnt-mandate-hashing-copy-pen-drive-or-cd-produced-it-mandates-hashing-original-only/ +# https://medium.com/@advbsmakar/digital-evidence-in-indian-courts-how-whatsapp-email-screenshots-are-changing-litigation-1530b512b12b +# https://www.forensicsware.com/blog/hash-values-and-hashing/ +# https://menhelpline.org/2023/08/22/sample-format-of-65b-certificate-under-indian-evidence-act/ +# https://www.barandbench.com/view-point/tech-savvy-evidence-system-step-by-step-guide-hash-function-value-electronic-evidence +# https://www.legalserviceindia.com/Legal-Articles/cornerstone-of-digital-evidence-ensuring-integrity-with-hash-values/ + + +def main(): + entries_per_page = 4 + hashalgos = collections.OrderedDict([ + ("MD5", hashlib.md5()), + ("SHA1", hashlib.sha1()), + ("SHA256", hashlib.sha256()), + ("SHA512", hashlib.sha512()) + ]) + doc = hashtool.docutil.make_document() + section = doc.sections[0] + hashtool.docutil.set_pageheader(section, "Certificate") + hashtool.docutil.set_pagenum_footer(section) + left_width, right_width = get_table_widths(section) + for idx, path in enumerate(pathlib.Path("data").iterdir()): + if idx and idx % entries_per_page == 0: + add_signature_and_pagebreak(doc) + hashes = hashtool.hash.filehashes(path, hashalgos) + add_filehashes_table(doc, left_width, right_width, path, hashes) + doc.add_paragraph() # add space below the table + add_signature_and_pagebreak(doc) + doc.save("hash.docx") + + +def add_filehashes_table(doc, left_width, right_width, path, hashes): + table = doc.add_table(rows=1, cols=2) + table.style = "Table Grid" + table.autofit = False + header_cells = table.rows[0].cells + hashtool.docutil.set_headercell(header_cells[0], str(path), left_width + right_width) + for hashalgo in hashes.keys(): + row_cells = table.add_row().cells + hashtool.docutil.set_bodycell(row_cells[0], hashalgo, left_width) + hashtool.docutil.set_bodycell(row_cells[1], hashes[hashalgo], right_width) + + +def add_signature_and_pagebreak(doc): + doc.add_paragraph("\n" * 4 + "signature: ____________________ date: ________________") + doc.add_page_break() + + +def get_table_widths(section: docx.section.Section): + table_width = section.page_width - section.left_margin - section.right_margin + left_width = docx.shared.Mm(22) + right_width = table_width - left_width + return left_width, right_width + + +if __name__ == "__main__": + main() diff --git a/tests/__init__.py b/tests/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/tests/test_hash.py b/tests/test_hash.py new file mode 100644 index 0000000..ce1e83f --- /dev/null +++ b/tests/test_hash.py @@ -0,0 +1,14 @@ +import hashlib +import unittest + +import hashtool.hash + + +class TestFilehashes(unittest.TestCase): + def test_sha256(self): + hexdigests = hashtool.hash.filehashes("data/image001.jpg", {"SHA256": hashlib.sha256()}) + self.assertEqual(hexdigests, {"SHA256": "75669a50892ea4e8e4ba2565915a7d48af9d98393ea463fd9cd71a6d16f258d2"}) + + +if __name__ == "__main__": + unittest.main()