Developer Reference

Contents

GFpECSignSM2

Computes a digital signature over a message digest using the SM2 scheme.

Syntax

IppStatus ippsGFpECSignSM2(const IppsBigNumState*
pMsgDigest
, const IppsBigNumState*
pRegPrivate
, const IppsBigNumState*
pEphPrivate
, IppsBigNumState*
pSignR
, IppsBigNumState*
pSignS
, IppsGFpECState*
pEC
, Ipp8u*
pScratchBuffer
);
Include Files
ippcp.h
Parameters
pMsgDigest
Pointer to the message digest
msg
to be digitally signed, that is, to be encrypted with a private key.
pRegPrivate
Pointer to the regular private key of the signer.
pEphPrivate
Pointer to the ephemeral private key of the signer.
pSignR
Pointer to the integer
r
of the digital signature.
pSignS
Pointer to the integer
s
of the digital signature.
pEC
Pointer to the context of the elliptic curve.
pScratchBuffer
Pointer to the scratch buffer.
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 regular private key
regPrivKey
and the ephemeral private key
ephPrivKey
can be generated by the functions GFpECPrivateKey and GFpECPublicKey with only the requirement that the key
regPrivKey
be different from the key
ephPrivKey
.
The elliptic curve domain parameters must be hitherto defined by the functions: GFpECInitStd, GFpECInit, GFpECSet, or GFpECSetSubgroup.
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
,
pRegPrivate
,
pEphPrivate
,
pSignR
,
pSignS
, or
pEC
does not match the operation.
ippStsMessageErr
Indicates an error condition if the value of
msg
pointed to by
pMsgDigest
is negative.
ippStsRangeErr
Indicates an error condition if any of the parameters pointed to by
pSignR
or
pSignS
has a memory size that is smaller than the order
n
of the elliptic curve base point
G
.
ippStsIvalidPrivateKey
Indicates an error condition in the following cases:
  • Any of the parameters pointed to by
    pRegPrivate
    or
    pEphPrivate
    has a memory size that is smaller than the order
    n
    of the elliptic curve base point
    G
    .
  • Value of any of the private keys is greater than or equal to the order
    n
    of the elliptic curve base point
    G
    .
ippStsNotSupportedModeErr
Indicates an error condition if the finite field GFp under the elliptic curve is not prime.
ippStsEphemeralKeyErr
Indicates an error condition if values of the ephemeral keys
ephPrivKey
and
ephPubKey
are not valid: the digital signature calculation returns
r
=0 or
s
=0 as a result.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.