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TPMAPI_E_INVALID_KEY_SIZE
TPMAPI_E_INVALID_KEY_SIZE is a Windows TPM API result. It indicates that the key size is unsupported, malformed, or inconsistent with the selected algorithm and parameters.
What to check for TPMAPI_E_INVALID_KEY_SIZE
- Confirm that the requested algorithm and key size are supported by the target TPM and policy.
- Validate all size fields after importing or decoding a key blob.
- Use a supported key template instead of modifying only one field of an existing template.
Microsoft documentation for TPMAPI error codes
Diagnostic discriminator: Compare the requested key size with the algorithm and TPM API constraints for that operation. This result isolates an unsupported size rather than generic key-parameter corruption.
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