Developer Reference

Contents

TDESDecryptECB

Decrypts variable length data stream in the ECB mode (deprecated).

Syntax

IppStatus ippsTDESDecryptECB(const Ipp8u *
pSrc
, Ipp8u *
pDst
, int
length
, const IppsDESSpec *
pCtx1
, const IppsDESSpec *
pCtx2,
const IppsDESSpec *
pCtx3,
IppsCPPadding
padding
);
Include Files
ippcp.h
Parameters
pSrc
Input ciphertext data stream of variable length.
pDst
Resulting plaintext data stream.
length
Input data stream length 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.
padding
IppsPaddingNONE
padding scheme.
Description
This algorithm is considered weak due to known attacks on it. The functionality remains in the library, but the implementation will no longer be optimized and no security patches will be applied. A more secure alternative is available: AES.
This function decrypts the input data stream of a variable length according to the cipher scheme specified in [NIST SP 800-38A]. The function uses three sets of supplied round keys in the ECB mode. The function returns the ciphertext result and validates the final plaintext block.
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 decrypted plaintext data stream length is less than or equal to zero.
ippStsUnderRunErr
Indicates an error condition if
length
is not divisible by cipher block size.
ippStsContextMatchErr
Indicates an error condition if the
pCtx1
,
pCtx2
, or
pCtx3
parameter does not match the operation.

Product and Performance Information

1

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Notice revision #20110804