Contents

GFpECDecryptSM2_Ext

The function encrypts the input text based on the SM2 protocol.

Syntax

IppStatus ippsGFpECDecryptSM2_Ext(Ipp8u * pOut, int maxOutLen, int * pOutSize, const Ipp8u * pInp, int inpLen, const IppsBigNumState * pPrvKey, IppsGFpECState * pEC, Ipp8u * pScratchBuffer)

Include Files

ippcp.h

Parameters

pOut

Pointer output cipher text.

maxOutLen

Available cipher-size container.

pOutSize

Size of the cipher text filled in the container

  • 0 - if the function ends with an error

  • other (>0) - if the function ends with OK

pInp

Pointer message encrypt.

inpLen

Message size encrypt.

pPrvKey

Pointer to the private keys of the elliptic curve.

pEC

Pointer to the elliptic curve context.

pScratchBuffer

Pointer to the scratch buffer for the elliptic curve.

Description

The function comes with the decrypted text according to the SM2 Encrypt protocol. This implementation is based on the [GM/T 0003.4-2012 SM2] standard.

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 are NULL.

ippStsContextMatchErr

Indicates an error condition if the IppsGFpECState context parameter does not match the operation.

ippStsNotSupportedModeErr

Indicates an error condition if the IppsGFpECState context parameter defines an elliptic curve over an extension of the prime finite field.

ippStsOutOfRangeErr

Indicates an error condition if the invalid input argument range - inpLen < 0 or maxOutLen is not enough for the encryption.

ippStsInvalidPrivateKey

Indicates an error condition if the secret key is not within (0, order).

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