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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // SMS4 encryption/decryption
46 //
47 // Contents:
48 // cpEncryptSMS4_cbc()
49 //
50 */
51
52 #include "owncp.h"
53 #include "pcpsms4.h"
54 #include "pcptool.h"
55
56 #if !defined _PCP_SMS4_ENCRYPT_CBC_H
57 #define _PCP_SMS4_ENCRYPT_CBC_H
58
59 /*F*
60 // Name: ippsSMS4EncryptCBC
61 //
62 // Purpose: SMS4-CBC encryption.
63 //
64 // Returns: Reason:
65 // ippStsNullPtrErr pCtx == NULL
66 // pSrc == NULL
67 // pDst == NULL
68 // pIV == NULL
69 // ippStsContextMatchErr !VALID_SMS_ID()
70 // ippStsLengthErr len <1
71 // ippStsUnderRunErr 0!=(dataLen%MBS_SMS4)
72 // ippStsNoErr no errors
73 //
74 // Parameters:
75 // pSrc pointer to the source data buffer
76 // pDst pointer to the target data buffer
77 // dataLen input/output buffer length (in bytes)
78 // pCtx pointer to the SMS4 context
79 // pIV pointer to the initialization vector
80 //
81 *F*/
cpEncryptSMS4_cbc(const Ipp8u * pIV,const Ipp8u * pSrc,Ipp8u * pDst,int dataLen,const IppsSMS4Spec * pCtx)82 static void cpEncryptSMS4_cbc(const Ipp8u* pIV,
83 const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
84 const IppsSMS4Spec* pCtx)
85 {
86 const Ipp32u* pRoundKeys = SMS4_RK(pCtx);
87
88 /* read IV */
89 Ipp32u iv[MBS_SMS4/sizeof(Ipp32u)];
90 CopyBlock16(pIV, iv);
91
92 /* do encryption */
93 for(; dataLen>0; dataLen-=MBS_SMS4, pSrc+=MBS_SMS4, pDst+=MBS_SMS4) {
94 iv[0] ^= ((Ipp32u*)pSrc)[0];
95 iv[1] ^= ((Ipp32u*)pSrc)[1];
96 iv[2] ^= ((Ipp32u*)pSrc)[2];
97 iv[3] ^= ((Ipp32u*)pSrc)[3];
98
99 cpSMS4_Cipher(pDst, (Ipp8u*)iv, pRoundKeys);
100
101 iv[0] = ((Ipp32u*)pDst)[0];
102 iv[1] = ((Ipp32u*)pDst)[1];
103 iv[2] = ((Ipp32u*)pDst)[2];
104 iv[3] = ((Ipp32u*)pDst)[3];
105 }
106 }
107
108 #endif /* #if !defined _PCP_SMS4_ENCRYPT_CBC_H */
109