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fix: handle corrupted signature data - #5916
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When processing PDF signatures, hex2bin() and stream_get_contents() can fail and return false when dealing with corrupted or malformed signature data. Previously, this would cause a TypeError when false was passed to processSignature() which expects ?string. Now, invalid signatures are properly reported to users with a 'Digest Mismatch' validation error instead of causing a fatal error. This fix: - Validates hex2bin() return value before yielding - Validates stream_get_contents() return value before processing - Returns null for corrupted signatures which are then reported as invalid - Suppresses expected hex2bin() warnings for non-hexadecimal data Fixes the issue reported where users encountered: TypeError: Argument #2 ($signature) must be of type ?string, false given Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>
Add test case to verify that PDFs with corrupted signature data (invalid hexadecimal strings) are properly handled and reported to users with appropriate validation errors instead of throwing exceptions. The test verifies: - Corrupted signatures return validation error - Error has correct structure with id and label - Error is identified as 'Digest mismatch' (id: 3) - No fatal errors or exceptions are thrown Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>
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