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Cap RSA at 3072 bits, add zstd compression for QR codes

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- RSA key size capped at 3072 bits (4096 too large for QR codes)
- Added zstd compression for QR code RSA keys (better ratio than zlib)
- New prefix STEGASOO-ZS: for zstd, backward compatible with STEGASOO-Z: (zlib)
- Added zstandard dependency to web/api/compression extras
- Updated all docs, CLI options, and web UI to reflect 3072 max
- Version bump to 4.2.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Aaron D. Lee
2026-01-09 23:30:31 -05:00
parent 175362ce4c
commit 3fd3204552
13 changed files with 118 additions and 39 deletions
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9
frontends/web/app.py
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@@ -253,6 +253,7 @@ from stegasoo.qr_utils import (
detect_and_crop_qr,
extract_key_from_qr,
generate_qr_code,
is_compressed,
)
# Initialize subprocess wrapper (worker script must be in same directory)
@@ -1209,8 +1210,8 @@ def encode_page():
rsa_key_from_qr = False
if rsa_key_pem:
# Webcam-scanned PEM key (v4.1.5) - may be compressed
if rsa_key_pem.startswith("STEGASOO-Z:"):
# Webcam-scanned PEM key (v4.1.5+) - may be compressed (zlib or zstd)
if is_compressed(rsa_key_pem):
rsa_key_pem = decompress_data(rsa_key_pem)
rsa_key_data = rsa_key_pem.encode("utf-8")
rsa_key_from_qr = True
@@ -1648,8 +1649,8 @@ def decode_page():
rsa_key_from_qr = False
if rsa_key_pem:
# Webcam-scanned PEM key (v4.1.5) - may be compressed
if rsa_key_pem.startswith("STEGASOO-Z:"):
# Webcam-scanned PEM key (v4.1.5+) - may be compressed (zlib or zstd)
if is_compressed(rsa_key_pem):
rsa_key_pem = decompress_data(rsa_key_pem)
rsa_key_data = rsa_key_pem.encode("utf-8")
rsa_key_from_qr = True