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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // AES-XTS Internal Definitions
46 //
47 //
48 */
49
50 #if !defined(_PCP_AES_XTS_H)
51 #define _PCP_AES_XTS_H
52
53 #include "owncp.h"
54 #include "pcpaesm.h"
55
56 #define _NEW_XTS_API_3
57 #if defined (_NEW_XTS_API_3)
58 /*
59 // AES-XTS State
60 */
61 #if !defined(AES_BLK_SIZE)
62 #define AES_BLK_SIZE (IPP_AES_BLOCK_BITSIZE/BITSIZE(Ipp8u))
63 #endif
64
65 #define AES_BLKS_PER_BUFFER (32)
66
67 struct _cpAES_XTS
68 {
69 IppCtxId idCtx;
70 int duBitsize; /* size of data unit (in bits) */
71 __ALIGN16 IppsAESSpec datumAES; /* datum AES context */
72 __ALIGN16 IppsAESSpec tweakAES; /* tweak AES context */
73 };
74
75 /* valid AES_XTS context ID */
76 #define VALID_AES_XTS_ID(ctx) ((ctx)->idCtx==idCtxAESXTS)
77
78 /* size of AES-XTS context */
cpSizeof_AES_XTS_Ctx(void)79 __INLINE int cpSizeof_AES_XTS_Ctx(void)
80 {
81 return sizeof(IppsAES_XTSSpec) +(AES_ALIGNMENT-1);
82 }
83
IsLegalGeometry(int startCipherBlkNo,int bitLen,int duBitsize)84 static int IsLegalGeometry(int startCipherBlkNo, int bitLen, int duBitsize)
85 {
86 int duBlocks = (duBitsize+IPP_AES_BLOCK_BITSIZE-1)/IPP_AES_BLOCK_BITSIZE;
87 int legalBlk = (0<=startCipherBlkNo && startCipherBlkNo<duBlocks) && ((startCipherBlkNo*IPP_AES_BLOCK_BITSIZE+bitLen)<=duBitsize);
88 int legalLen = 0;
89 if(0 == duBitsize%IPP_AES_BLOCK_BITSIZE) {
90 legalLen = (0 == bitLen%IPP_AES_BLOCK_BITSIZE);
91 }
92 else
93 if(bitLen%IPP_AES_BLOCK_BITSIZE)
94 legalLen = (startCipherBlkNo*IPP_AES_BLOCK_BITSIZE+bitLen == duBitsize);
95 return legalBlk && legalLen;
96 }
97
98
99 #endif /* _NEW_XTS_API_ */
100
101 #endif /* _PCP_AES_XTS_H */
102