The low-level message functions provide the necessary functionality to encode data for transmission and decode data that has been received. Functionality is also provided to decrypt and verify the signatures of received messages.
The following functions are included in this category and can also be found in Wincrypt.h.
| Function | Description |
|---|---|
| CryptMsgCalculateEncodedLength | Calculates the length of an encoded cryptographic message. |
| CryptMsgClose | Closes a handle to a cryptographic message. |
| CryptMsgControl | Performs a special control function after the final CryptMsgUpdate of an encoded or decoded cryptographic message. |
| CryptMsgCountersign | Countersigns an already existing signature in a message. |
| CryptMsgCountersignEncoded | Countersigns an already existing signature (encoded SignerInfo, as defined by PKCS #7). |
| CryptMsgDuplicate | Duplicates a cryptographic message handle by incrementing the reference count. The reference count keeps track of the lifetime of the message. |
| CryptMsgEncodeAndSignCTL | Encodes the CTL and creates a signed message containing the encoded CTL. |
| CryptMsgGetAndVerifySigner | Gets and verifies the signer of a cryptographic message. |
| CryptMsgGetParam | Gets a parameter after encoding or decoding a cryptographic message. |
| CryptMsgOpenToDecode | Opens a cryptographic message for decoding. |
| CryptMsgOpenToEncode | Opens a cryptographic message for encoding. |
| CryptMsgSignCTL | Creates a signed message containing the encoded CTL. |
| CryptMsgUpdate | Updates the contents of a cryptographic message. |
| CryptMsgVerifyCountersignatureEncoded | Verify a countersignature in terms of the SignerInfo data structure (as defined by PKCS # 7). |