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SL_REMAPPING_SP_PUB_CRYPTO_INVALID_KEYLENGTH
Why this is more specific than an activation failure
Keep the symbolic result SL_REMAPPING_SP_PUB_CRYPTO_INVALID_KEYLENGTH together with HRESULT 0xC004D201. The producer is cryptographic processing inside the security processor; at the provider, algorithm, key, hash, signature and block-processing stage used to authenticate protected licensing data, Windows determined that the supplied cryptographic key material has a length unsupported by the selected algorithm or key type.
This result already rules out several broad guesses: key length is separate from block length and from the length of an encoded key blob. Preserve its operation name, product instance and timestamp so a later retry does not hide the original failure.
A reproducible troubleshooting path
- Identify the caller and operation instance that produced
0xC004D201. - Preserve the first inner I/O, crypto, parser or policy status that precedes the public HRESULT.
- Collect the code-specific evidence: record algorithm/provider ID, expected key sizes, supplied byte length and import format.
Inputs that distinguish this condition
- 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
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 record algorithm/provider ID, expected key sizes, supplied byte length and import format.
Cryptographic material should be logged by identifier, length, hash or thumbprint rather than by exporting secret keys or plaintext protected data.
Similar symptoms, different boundaries
| Result | Different condition |
|---|---|
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_BLOCKLENGTH | Compared with this result, the configured block length is incompatible with the selected cipher. |
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_CIPHERMODE | Compared with this result, the requested encrypt/decrypt or chaining-mode configuration is internally contradictory or unsupported. |
Correcting the producing condition
Generate or import key material with a supported size for the chosen provider and algorithm.
Representative case: An AES operation is initialized with a key buffer whose size is not supported by the provider.
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 — technical contract for the subsystem producing it.
- BCryptHashData — official platform context used to interpret it.
- BCryptVerifySignature — supported state, API or recovery information relevant to this HRESULT.
- Signing data with CNG — reference for evidence collection and post-repair verification.
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