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SL_REMAPPING_SP_PUB_CRYPTO_INVALID_PADDING
Where the failure occurs in Software Protection Platform
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_PADDING (0xC004D211) is emitted by cryptographic processing inside the security processor. It marks a specific point inside the provider, algorithm, key, hash, signature and block-processing stage used to authenticate protected licensing data: the final CBC block contains padding bytes that do not satisfy the expected padding scheme.
This result already rules out several broad guesses: padding failure may indicate truncation, wrong key/IV or tampering; it is not solved by ignoring the final bytes. Preserve its operation name, product instance and timestamp so a later retry does not hide the original failure.
Where it sits in the licensing pipeline
Algorithm selection, key lookup, block formatting and signature verification are independent boundaries; a failure in one does not prove corruption at the others. To verify this, record cipher/mode, block size, IV provenance, ciphertext length and padding setting.
Cryptographic material should be logged by identifier, length, hash or thumbprint rather than by exporting secret keys or plaintext protected data.
State to compare on both sides of the failure
- cipher mode, block size and padding mode
- hash state and digest length
- signature format, length and verification key
- provider and algorithm identifiers
- key type and key-material length
Related codes with different remedies
| Result | Different condition |
|---|---|
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_FORMAT | Compared with this result, the RSA block encoding does not match the format required by the current operation. |
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_BLOCK | Compared with this result, an RSA operation produced or received a block that fails the structural checks for the selected operation. |
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_SIGNATURE | Compared with this result, signature verification completed and the signature does not authenticate the supplied hash with the selected key. |
Testing the failing stage
- Identify the caller and operation instance that produced
0xC004D211. - Collect the code-specific evidence: record cipher/mode, block size, IV provenance, ciphertext length and padding setting.
Correcting the producing condition
Restore the correct key, IV and complete ciphertext, then decrypt with the matching padding mode.
Representative case: A protected blob is decrypted with the wrong IV and its final padding check fails.
Actions that usually destroy useful evidence
- Do not publish keys, decrypted license blobs or complete protected payloads in a support ticket.
- Do not disable signature or padding validation to make the operation continue.
Technical references
- CNG cryptographic primitive functions — supported state, API or recovery information relevant to this HRESULT.
- BCryptHashData — reference for evidence collection and post-repair verification.
- BCryptVerifySignature — technical contract for the subsystem producing it.
- Signing data with CNG — official platform context used to interpret it.
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