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CRYPT_E_FILERESIZED
CRYPT_E_FILERESIZED should be read at the signed-file rewrite boundary. A write would change the size or layout of a file that already contains a signature, so an incremental update cannot preserve the existing signed representation. For signed-file rewrite, the useful diagnostic question is which concrete object and operation caused Windows to select this exact HRESULT—not whether a key, certificate, account, file, or device merely “works.”
Locate the first failing boundary
For CRYPT_E_FILERESIZED, the operation is attempting to update a file whose signed byte representation cannot be preserved by an incremental resize. Capture the file format, existing signatures, requested property or content change, and the API that performs the Put operation when CRYPT_E_FILERESIZED is returned.
Useful observations, not generic logs
| Record | Why it matters for this code |
|---|---|
| original file size, format, signature locations, and signer information | Locates the first cryptographic or representation boundary that fails when CRYPT_E_FILERESIZED is returned. |
| the exact update that changes file size or layout | Separates object identity and binary structure from later trust policy when CRYPT_E_FILERESIZED is returned. |
| whether the format supports a complete resigning workflow and which signer key is available | Provides a known-good control without rewriting production evidence when CRYPT_E_FILERESIZED is returned. |
Code-specific checks:
- Identify whether the file uses embedded Authenticode, catalog signing, or another structured signature.
- Compare the pre-sign and post-update byte layout and determine which tool performed the Put operation.
- Complete all content changes before running a fresh full signing operation.
Preserve the evidence chain
For CRYPT_E_FILERESIZED, preserve the path from source artifact to the byte sequence or object passed into the Windows cryptographic API. In the CRYPT_E_FILERESIZED path, record file acquisition, transport decoding, object selection, structure identifier, provider selection, and the exact call that first rejects the data. This prevents later trust or certificate errors from being mistaken for the original representation or lookup failure in a signed-file rewrite investigation.
- In the CRYPT_E_FILERESIZED path, the untouched artifact or a reproducible nonsecret sample with a cryptographic hash for identity.
- For CRYPT_E_FILERESIZED, the API structure type, encoding flags, object or certificate selector, and caller identity.
- In the CRYPT_E_FILERESIZED path, independent decode, lookup, or signature observations that do not modify the original evidence.
Reproduction without destructive cleanup
Copy the unsigned source artifact, apply the change, and perform a complete signing operation in a signed-file rewrite investigation. For CRYPT_E_FILERESIZED, compare that result with an attempted in-place update of the already signed artifact. The control confirms whether the requested mutation inherently invalidates the signed representation when CRYPT_E_FILERESIZED is returned.
| Test | Interpretation |
|---|---|
| Same input, known-good path | For signed-file rewrite, success moves attention toward the selected provider, policy, device, context, or transaction state. |
| Known-good input, failing path | For signed-file rewrite, failure suggests that the environment or selected object is independently unable to perform the operation. |
| Original path after one isolated change | For signed-file rewrite, this comparison demonstrates whether the proposed correction addresses the original condition. |
How this differs from similar failures
Resigning is required because the signature covers a specific file representation; copying the old signature block after resizing is not equivalent. Appending bytes and then copying back the old signature does not preserve Authenticode or other signed-file semantics; the signature covers a defined representation, not merely a file name in a signed-file rewrite investigation.
For signed-file rewrite, keep representation, cryptographic execution, and trust evaluation separate. In this path, a byte sequence can decode correctly and still fail signature policy, while no chain repair can make malformed ASN.1 decode.
Regression check
In the CRYPT_E_FILERESIZED path, produce the final file layout first, then sign it completely and verify the resulting signature and chain using the intended trust policy. For CRYPT_E_FILERESIZED, keep a regression case that uses nonsecret identifiers and expected outcomes, including one negative control that must continue to fail.
Technical references
For CRYPT_E_FILERESIZED, these sources define the HRESULT and the relevant signed-file rewrite interface, protocol, or data format.
- Microsoft Open Specifications: HRESULT values.
- Microsoft: Authenticode digital signatures.
- Microsoft: WinVerifyTrustEx.
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