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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive. Modular Arithmetic Engine. General Functionality
45 //
46 // Contents:
47 // gsModEngineGetSize()
48 //
49 */
50
51 #include "owndefs.h"
52 #include "owncp.h"
53 #include "pcpbnumisc.h"
54 #include "pcpbnuarith.h"
55 #include "gsmodstuff.h"
56 #include "pcptool.h"
57
58 /*F*
59 // Name: gsModEngineGetSize
60 //
61 // Purpose: Specifies size of size of ModEngine context (Montgomery).
62 //
63 // Returns: Reason:
64 // ippStsLengthErr modulusBitSize < 1
65 // numpe < MOD_ENGINE_MIN_POOL_SIZE
66 // ippStsNoErr no errors
67 //
68 // Parameters:
69 // numpe length of pool
70 // modulusBitSize max modulus length (in bits)
71 // pSize pointer to size
72 //
73 *F*/
74
gsModEngineGetSize(int modulusBitSize,int numpe,int * pSize)75 IppStatus gsModEngineGetSize(int modulusBitSize, int numpe, int* pSize)
76 {
77 int modLen = BITS_BNU_CHUNK(modulusBitSize);
78 int pelmLen = BITS_BNU_CHUNK(modulusBitSize);
79
80 IPP_BADARG_RET(modulusBitSize<1, ippStsLengthErr);
81 IPP_BADARG_RET(numpe<MOD_ENGINE_MIN_POOL_SIZE, ippStsLengthErr);
82
83 /* allocates mimimal necessary to Montgomery based methods */
84 *pSize = sizeof(gsModEngine)
85 + modLen*sizeof(BNU_CHUNK_T) /* modulus */
86 + modLen*sizeof(BNU_CHUNK_T) /* mont_R */
87 + modLen*sizeof(BNU_CHUNK_T) /* mont_R^2 */
88 + pelmLen*sizeof(BNU_CHUNK_T)*numpe; /* buffers */
89
90 return ippStsNoErr;
91 }
92