Visible to Intel only — GUID: GUID-0DC7E5E2-5B77-4D2D-9E74-09E75C80A13D
Visible to Intel only — GUID: GUID-0DC7E5E2-5B77-4D2D-9E74-09E75C80A13D
ECCPSignSM2
Computes a digital signature over a message digest using the SM2 scheme.
Syntax
IppStatus ippsECCPSignSM2(const IppsBigNumState* pMsgDigest, const IppsBigNumState* pRegPrivate, IppsBigNumState* pEphPrivate, IppsBigNumState* pSignR, IppsBigNumState* pSignS, IppsECCPState* pECC);
Include Files
ippcp.h
Parameters
pMsgDigest |
Pointer to the message digest msg. |
pRegPrivate |
Pointer to the regular private key regPrivKey. |
pEphPrivate |
Pointer to the ephmeral private key ephPrivKey. |
pSignR |
Pointer to the integer r of the digital signature. |
pSignS |
Pointer to the integer s of the digital signature. |
pECC |
Pointer to the context of the elliptic cryptosystem. |
Description
The function computes two big numbers r and s that form the digital signature over a message digest msg.
The digital signature is computed using the SM2 scheme SM2. The scheme requires that the following cryptosystem keys are set up by the message sender:
regPrivKey |
Regular private key. |
ephPrivKey |
Ephemeral private key. |
ephPubKey |
Ephemeral public key. |
For security reasons, each signature must be generated with the unique ephemeral private key. Because of this, the function clears (sets to zero) the input ephemeral key before return. To generate and set up the keys, call the ECCPGenKeyPair function.
Before calling ECCPSignSM2, set up the domain parameters of the elliptic curve in the *pECC context by calling one of the functions: ECCPSet or ECCPSetStdSM2.
Return Values
ippStsNoErr |
Indicates no error. Any other value indicates an error or warning. |
ippStsNullPtrErr |
Indicates an error condition if any of the specified pointers is NULL. |
ippStsContextMatchErr |
Indicates an error condition if one of the specified contexts is not valid. |
ippStsMessageErr |
Indicates an error condition if the value of msg pointed by pMsgDigest is negative, or its size (in bits) is more than the order n of the elliptic curve base point G. |
ippStsRangeErr |
Indicates an error condition if one of the parameters pointed by pSignR or pSignS has memory size smaller than the order n of the elliptic curve base point G. |
ippStsEphemeralKeyErr |
Indicates an error condition if:
|
ippStsInvalidPrivateKey |
Indicates an error condition if the value of the private key does not belong to the [0, n-1] range, where n is the order of the elliptic curve base point G. |