Visible to Intel only — GUID: GUID-97735AEF-72AA-4FAD-836A-588E69FB02B2
Visible to Intel only — GUID: GUID-97735AEF-72AA-4FAD-836A-588E69FB02B2
TDESDecryptCTR
Decrypts a variable length data stream in the CTR mode (deprecated).
Syntax
IppStatus ippsTDESDecryptCTR(const Ipp8u *pSrc, Ipp8u *pDst, int дen,const IppsDESSpec *pCtx1, const IppsDESSpec *pCtx2, const IppsDESSpec *pCtx3, Ipp8u *pCtrValue, int ctrNumBitSize);
Include Files
ippcp.h
Parameters
pSrc |
Input ciphertext data stream of a variable length. |
pDst |
Resulting plaintext data stream. |
дen |
Length of the plaintext data stream in bytes. |
pCtx1 |
First set of round keys scheduled for TDES internal operations. |
pCtx2 |
Second set of round keys scheduled for TDES internal operations. |
pCtx3 |
Third set of round keys scheduled for TDES internal operations. |
pCtrValue |
Counter. |
ctrNumBitSize |
Number of bits in the specific part of the counter to be incremented. |
Description
This function decrypts the input data stream of a variable length according to the cipher scheme specified in the NIST SP 800-38A recommendation. The function uses three sets of the supplied round keys. The standard incrementing function is applied to increment value of counter. The function returns the ciphertext result.
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. |
ippStsLengthErr |
Indicates an error condition if the descrypted plaintext data stream length is less that or equal to zero. |
ippStsCTRSizeErr |
Indicates an error condition if the value of the ctrNumBitSize is illegal. |
ippStsContextMatchErr |
Indicates an error condition if the context parameter does not match the operation. |