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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. - 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. To verify this, record algorithm/provider ID, expected key sizes, supplied byte length and import format.
Similar symptoms, different conditions
| 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- Do not publish keys, decrypted license blobs or complete protected payloads in a support ticket.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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