Visible to Intel only — GUID: GUID-5135E591-9DD1-4643-9B06-CFC82E41E0EF
Visible to Intel only — GUID: GUID-5135E591-9DD1-4643-9B06-CFC82E41E0EF
GFpECPVerifyDSA, GFpECPVerifyNR, GFpECPVerifySM2
Verifies authenticity of the digital signature over a message digest (ECDSA).
Syntax
IppStatus ippsGFpECVerifyDSA(const IppsBigNumState* pMsgDigest, const IppsGFpECPoint* pRegPublic, const IppsBigNumState* pSignR, const IppsBigNumState* pSignS, IppECResult* pResult, IppsGFpECState* pEC, Ipp8u* pScratchBuffer);
IppStatus ippsGFpECVerifyNR(onst IppsBigNumState* pMsgDigest, const IppsGFpECPoint* pRegPublic, const IppsBigNumState* pSignR, const IppsBigNumState* pSignS, IppECResult* pResult, IppsGFpECState* pEC, Ipp8u* pScratchBuffer);
IppStatus ippsGFpECVerifySM2(const IppsBigNumState* pMsgDigest, const IppsGFpECPoint* pRegPublic, const IppsBigNumState* pSignR, const IppsBigNumState* pSignS, IppECResult* pResult, IppsGFpECState* pEC, Ipp8u* pScratchBuffer);
Include Files
ippcp.h
Parameters
pMsgDigest |
Pointer to the message digest msg. |
pRegPublic |
Pointer to the signer’s regular public key. |
pSignR |
Pointer to the integer r of the digital signature. |
pSignS |
Pointer to the integer s of the digital signature. |
pResult |
Pointer to the digital signature verification result. |
pEC |
Pointer to the context of the elliptic curve. |
pScratchBuffer |
Pointer to the scratch buffer of size produced by ippsGFpECScratchBufferSize. |
Description
These functions verify authenticity of the digital signature generated by the ippsGFpECPSignDSA , ippsGFpECPSignNR, and ippsGFpECPSignSM2functions, respectively. The signature consists of two large integers: r and s.
The ippsGFpECScratchBufferSize function should be called with nScalars equal to at least 2 to get the valid pScratchBuffer.
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 any of the contexts pointed to by pMsgDigest, pRegPublic, pSignR, pSignS, or pEC does not match the operation. |
ippStsMessageErr |
Indicates an error condition if the value of msg pointed to by pMsgDigest falls outside the range of [1, n-1], where n is the order of the elliptic curve base point G. |
ippStsRangeErr |
Indicates an error condition if any of the parameters pointed to by pSignR or pSignS is negative. |