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MSSIPOTF_E_CRYPT
An underlying cryptographic operation failed
MSSIPOTF_E_CRYPT means the OpenType handling path received a failure from CryptoAPI. It is a wrapper status, not a statement that one particular table is corrupt. Depending on the operation, the underlying issue can involve a provider, key, certificate, digest, signature, or policy input.
For signed fonts, first preserve the exact binary and avoid modifying any table while gathering diagnostics. A changed byte changes checksums and signed content, making the original cryptographic outcome impossible to reproduce. The actionable evidence is the earlier CryptoAPI status or verifier log that accompanies this wrapper code.
How to investigate
- Collect the complete crypto or trust diagnostic chain from the calling tool.
- Verify structural layout and checksums before attempting signature verification again.
- Check the provider, certificate material, and policy context separately from the font file format.
References
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