Perform a control operation on a PKCS#7 object (for example set/get detached signature).
Command-specific long result; for set/get detached, the detached flag (non-zero when detached).
| Name | Description |
|---|---|
| p7 | PKCS#7 object to modify or query. |
| cmd | Control code such as PKCS7_OP_SET_DETACHED_SIGNATURE or PKCS7_OP_GET_DETACHED_SIGNATURE. |
| larg | Integer argument interpreted according to cmd (for example detached flag). |
| parg | Optional pointer argument for cmd, or NULL when unused. |