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SL_REMAPPING_SP_PUB_CRYPTO_INVALID_BLOCKLENGTH
How to read this result without losing context
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_BLOCKLENGTH (0xC004D202) 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 configured block length is incompatible with the selected cipher.
For triage, this belongs to the cryptographic processing inside the security processor. This concerns algorithm configuration; NOT_BLOCK_ALIGNED concerns the amount of input data. Product-key changes or network tests are useful only when the evidence points back to those layers.
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. The decisive proof is to capture cipher ID, provider, reported block size and requested block-length property.
Cryptographic material should be logged by identifier, length, hash or thumbprint rather than by exporting secret keys or plaintext protected data.
What to capture before recovery
- 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
A practical way to isolate the cause
- Record this result,
0xC004D202, the exact API or service operation, and the affected product or protected object. - Capture the five state items above before restarting the service, rebuilding the store, repairing files or retrying activation.
- Prove the specific condition: capture cipher ID, provider, reported block size and requested block-length property.
- Compare the neighboring results below and identify which condition actually applies.
- Change one decisive precondition, repeat the original operation, and verify both the immediate HRESULT and durable license state.
Similar symptoms, different boundaries
| Result | Different condition |
|---|---|
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_CIPHER | Compared with this result, the requested cipher identifier is not a valid supported encryption algorithm. |
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_KEYLENGTH | Compared with this result, the supplied cryptographic key material has a length unsupported by the selected algorithm or key type. |
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_CIPHERMODE | Compared with it, the requested encrypt/decrypt or chaining-mode configuration is internally contradictory or unsupported. |
Targeted fix
Use the provider-reported block size and avoid overriding it with a value from another algorithm.
Representative case: A caller applies an AES-specific block setting to a different cipher implementation.
Actions that usually destroy useful evidence
- Do not disable signature or padding validation to make the operation continue.
- Do not publish keys, decrypted license blobs or complete protected payloads in a support ticket.
Technical references
- CNG cryptographic primitive functions — official platform context used to interpret it.
- BCryptHashData — supported state, API or recovery information relevant to this HRESULT.
- BCryptVerifySignature — reference for evidence collection and post-repair verification.
- Signing data with CNG — technical contract for the subsystem producing it.
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