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| |
| /* |
| // |
| // Purpose: |
| // Cryptography Primitive. |
| // SMS4 encryption/decryption |
| // |
| // Contents: |
| // cpEncryptSMS4_cbc() |
| // |
| */ |
| |
| #include "owncp.h" |
| #include "pcpsms4.h" |
| #include "pcptool.h" |
| |
| #if !defined _PCP_SMS4_ENCRYPT_CBC_H |
| #define _PCP_SMS4_ENCRYPT_CBC_H |
| |
| /*F* |
| // Name: ippsSMS4EncryptCBC |
| // |
| // Purpose: SMS4-CBC encryption. |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr pCtx == NULL |
| // pSrc == NULL |
| // pDst == NULL |
| // pIV == NULL |
| // ippStsContextMatchErr !VALID_SMS_ID() |
| // ippStsLengthErr len <1 |
| // ippStsUnderRunErr 0!=(dataLen%MBS_SMS4) |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pSrc pointer to the source data buffer |
| // pDst pointer to the target data buffer |
| // dataLen input/output buffer length (in bytes) |
| // pCtx pointer to the SMS4 context |
| // pIV pointer to the initialization vector |
| // |
| *F*/ |
| static void cpEncryptSMS4_cbc(const Ipp8u* pIV, |
| const Ipp8u* pSrc, Ipp8u* pDst, int dataLen, |
| const IppsSMS4Spec* pCtx) |
| { |
| const Ipp32u* pRoundKeys = SMS4_RK(pCtx); |
| |
| /* read IV */ |
| Ipp32u iv[MBS_SMS4/sizeof(Ipp32u)]; |
| CopyBlock16(pIV, iv); |
| |
| /* do encryption */ |
| for(; dataLen>0; dataLen-=MBS_SMS4, pSrc+=MBS_SMS4, pDst+=MBS_SMS4) { |
| iv[0] ^= ((Ipp32u*)pSrc)[0]; |
| iv[1] ^= ((Ipp32u*)pSrc)[1]; |
| iv[2] ^= ((Ipp32u*)pSrc)[2]; |
| iv[3] ^= ((Ipp32u*)pSrc)[3]; |
| |
| cpSMS4_Cipher(pDst, (Ipp8u*)iv, pRoundKeys); |
| |
| iv[0] = ((Ipp32u*)pDst)[0]; |
| iv[1] = ((Ipp32u*)pDst)[1]; |
| iv[2] = ((Ipp32u*)pDst)[2]; |
| iv[3] = ((Ipp32u*)pDst)[3]; |
| } |
| } |
| |
| #endif /* #if !defined _PCP_SMS4_ENCRYPT_CBC_H */ |