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ippStsEphemeralKeyErr
This ECC status concerns the ephemeral key used by the current operation, not necessarily the long-term private key stored by the application. It commonly points to per-message or per-session key generation, import, or domain mismatch.
For ECDH and ECDSA-style flows, the temporary scalar or point must be valid for the selected curve. A reused, truncated, all-zero, out-of-range, or wrong-curve value can break the operation before any peer data is processed.
Where to look first
- The random generator and retry logic that produced the ephemeral value.
- The curve/domain selected when the context was initialized.
- Serialization boundaries between big-endian byte strings and internal IPP structures.
Intel IPP Error Reporting · Intel IPP Cryptography Reference · NIST SP 800-56A key agreement guidance
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