Contents

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.

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.

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.

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GFpECPSignDSA, GFpECPSignNR, GFpECPSignSM2

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