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1 /* |
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2 * Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 /** |
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20 @file |
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21 @internalTechnology |
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22 */ |
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23 |
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24 #ifndef __INLINES_H__ |
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25 #define __INLINES_H__ |
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26 |
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27 #include <e32base.h> |
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28 |
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29 #define assert(x) __ASSERT_DEBUG((x), User::Panic(_L("crypto.dll"), 1)) |
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30 |
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31 #if defined(__GCC32__) |
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32 typedef long long Int64; |
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33 typedef unsigned long long Uint64; |
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34 #elif defined(__VC32__) |
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35 typedef __int64 Int64; |
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36 typedef unsigned __int64 Uint64; |
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37 #elif defined(__CW32__) |
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38 #pragma longlong on |
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39 typedef long long Int64; |
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40 typedef unsigned long long Uint64; |
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41 #endif |
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42 |
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43 typedef Uint64 dword; |
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44 typedef TUint word; |
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45 typedef TUint32 word32; |
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46 |
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47 const TUint WORD_SIZE = sizeof(TUint); |
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48 const TUint WORD_BYTES = WORD_SIZE; |
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49 const TUint BYTE_BITS = 8; |
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50 const TUint WORD_BITS = WORD_SIZE*BYTE_BITS; |
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51 |
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52 //These next two versions of GETBYTE compile to LDR's of words and then shifts |
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53 //and ands to get it down to a byte. |
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54 //#define GETBYTE(x, y) (TUint)(((x)>>(8*(y)))&255) |
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55 //#define GETBYTE(x, y) (TUint)TUint8((x)>>(8*(y))) |
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56 |
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57 //This next version gets the best assembler on gcc and armv4 (it uses LDRB |
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58 //rather than shifts and ands |
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59 #define GETBYTE(x, y) (((TUint8 *)&(x))[y]) |
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60 |
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61 #define MAKE_DWORD(lowWord, highWord) ((dword(highWord)<<WORD_BITS) | (lowWord)) |
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62 #define LOW_WORD(x) (TUint32)(x) |
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63 #define HIGH_WORD(x) (TUint32)((x)>>WORD_BITS) |
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64 |
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65 template <class T> inline void TClassSwap(T& a, T& b) |
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66 { |
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67 T temp(a); |
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68 a = b; |
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69 b = temp; |
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70 } |
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71 |
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72 // Returns log2 of aNum where aNum is a power |
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73 // of two |
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74 inline TUint8 CryptoLog2(TUint8 aNum) |
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75 { |
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76 switch (aNum) |
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77 { |
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78 case 1: |
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79 return 0; |
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80 case 1 << 1: |
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81 return 1; |
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82 case 1 << 2: |
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83 return 2; |
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84 case 1 << 3: |
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85 return 3; |
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86 case 1 << 4: |
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87 return 4; |
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88 case 1 << 5: |
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89 return 5; |
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90 case 1 << 6: |
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91 return 6; |
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92 case 1 << 7: |
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93 return 7; |
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94 default: |
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95 ASSERT(EFalse); |
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96 } |
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97 return 0; |
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98 } |
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99 |
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100 inline TUint BitsToBytes(TUint bitCount) |
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101 { |
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102 return ((bitCount+7)/(BYTE_BITS)); |
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103 } |
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104 |
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105 inline TUint BytesToWords(TUint byteCount) |
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106 { |
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107 return ((byteCount+WORD_SIZE-1)/WORD_SIZE); |
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108 } |
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109 |
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110 inline TUint BitsToWords(TUint bitCount) |
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111 { |
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112 return ((bitCount+WORD_BITS-1)/(WORD_BITS)); |
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113 } |
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114 |
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115 inline TUint WordsToBits(TUint wordCount) |
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116 { |
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117 return wordCount * WORD_BITS; |
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118 } |
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119 |
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120 inline TUint BytesToBits(TUint byteCount) |
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121 { |
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122 return byteCount * BYTE_BITS; |
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123 } |
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124 |
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125 inline TUint WordsToBytes(TUint wordCount) |
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126 { |
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127 return wordCount * WORD_BYTES; |
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128 } |
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129 |
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130 inline void XorWords(TUint32* r, const TUint32* a, TUint n) |
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131 { |
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132 assert(((TUint32)r & 3) == 0); // Catch alignment problems |
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133 |
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134 for (TUint i=0; i<n; i++) |
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135 r[i] ^= a[i]; |
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136 } |
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137 |
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138 inline void XorBuf(TUint8* buf, const TUint8* mask, TUint count) |
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139 { |
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140 if (((TUint)buf | (TUint)mask | count) % WORD_SIZE == 0) |
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141 { |
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142 XorWords((TUint32*)buf, (const TUint32*)mask, count/WORD_SIZE); |
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143 } |
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144 else |
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145 { |
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146 for (TUint i=0; i<count; i++) |
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147 buf[i] ^= mask[i]; |
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148 } |
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149 } |
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150 |
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151 // ************** rotate functions *************** |
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152 template <class T> inline T rotlFixed(T x, TUint y) |
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153 { |
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154 assert(y < sizeof(T)*8); |
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155 return ( (T)((x<<y) | (x>>(sizeof(T)*8-y))) ); |
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156 } |
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157 |
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158 template <class T> inline T rotrFixed(T x, TUint y) |
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159 { |
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160 assert(y < sizeof(T)*8); |
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161 return ((T)((x>>y) | (x<<(sizeof(T)*8-y)))); |
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162 } |
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163 |
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164 inline TUint32 byteReverse(TUint32 value) |
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165 { |
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166 value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8); |
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167 return rotlFixed(value, 16U); |
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168 } |
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169 |
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170 template <class T> |
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171 void byteReverse(T* out, const T* in, TUint32 byteCount) |
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172 { |
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173 TUint count = (byteCount+sizeof(T)-1)/sizeof(T); |
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174 for (TUint i=0; i<count; i++) |
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175 out[i] = byteReverse(in[i]); |
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176 } |
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177 |
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178 template <class T> |
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179 inline void GetUserKeyLittleEndian(T *out, TUint32 outlen, const TUint8* in, TUint32 inlen) |
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180 { |
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181 const TUint U = sizeof(T); |
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182 assert(inlen <= outlen*U); |
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183 Mem::Copy(out, in, inlen); |
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184 Mem::FillZ((TUint8*)out+inlen, outlen*U-inlen); |
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185 } |
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186 |
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187 template <class T> |
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188 inline void GetUserKeyBigEndian(T *out, TUint32 outlen, const TUint8* in, TUint32 inlen) |
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189 { |
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190 const TUint U = sizeof(T); |
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191 assert(inlen <= outlen*U); |
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192 Mem::Copy(out, in, inlen); |
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193 Mem::FillZ((TUint8*)out+inlen, outlen*U-inlen); |
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194 byteReverse(out, out, inlen); |
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195 } |
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196 |
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197 // The following methods have be changed to use byte rather than word accesses, |
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198 // as if the input pointer is not be word aligned a fault occurs on arm |
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199 // hardware. This isn't optimal from a performance point of view, but it is |
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200 // neccessary because the crypto interfaces (CSymmetricCipher, |
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201 // CBlockTransformation) allow clients to pass non-aligned data. |
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202 |
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203 // Fetch 4 words from user's buffer into "a", "b", "c", "d" in LITTLE-endian order |
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204 inline void GetBlockLittleEndian(const TUint8* block, TUint16 &a, TUint16 &b, TUint16 &c, TUint16 &d) |
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205 { |
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206 a = (TUint16)(block[0] | block[1] << 8); |
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207 b = (TUint16)(block[2] | block[3] << 8); |
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208 c = (TUint16)(block[4] | block[5] << 8); |
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209 d = (TUint16)(block[6] | block[7] << 8); |
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210 } |
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211 |
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212 // Put 4 words back into user's buffer in LITTLE-endian order |
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213 inline void PutBlockLittleEndian(TUint8* block, TUint16 a, TUint16 b, TUint16 c, TUint16 d) |
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214 { |
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215 block[0] = (TUint8)(a & 0xff); |
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216 block[1] = (TUint8)(a >> 8); |
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217 block[2] = (TUint8)(b & 0xff); |
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218 block[3] = (TUint8)(b >> 8); |
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219 block[4] = (TUint8)(c & 0xff); |
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220 block[5] = (TUint8)(c >> 8); |
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221 block[6] = (TUint8)(d & 0xff); |
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222 block[7] = (TUint8)(d >> 8); |
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223 } |
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224 |
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225 // Fetch 1 word from user's buffer in BIG-endian order |
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226 inline void GetWordBigEndian(const TUint8* block, TUint32 &a) |
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227 { |
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228 a = block[0] << 24 | block[1] << 16 | block[2] << 8 | block[3]; |
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229 } |
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230 |
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231 // Put 1 word back into user's buffer in BIG-endian order |
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232 inline void PutWordBigEndian(TUint8* block, TUint32 a) |
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233 { |
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234 block[0] = (TUint8)(a >> 24); |
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235 block[1] = (TUint8)((a >> 16) & 0xff); |
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236 block[2] = (TUint8)((a >> 8) & 0xff); |
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237 block[3] = (TUint8)(a & 0xff); |
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238 } |
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239 |
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240 // Fetch 2 words from user's buffer into "a", "b" in BIG-endian order |
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241 inline void GetBlockBigEndian(const TUint8* block, TUint32 &a, TUint32& b) |
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242 { |
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243 GetWordBigEndian(block, a); |
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244 GetWordBigEndian(block + 4, b); |
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245 } |
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246 |
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247 // Put 2 words back into user's buffer in BIG-endian order |
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248 inline void PutBlockBigEndian(TUint8* block, TUint32 a, TUint32 b) |
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249 { |
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250 PutWordBigEndian(block, a); |
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251 PutWordBigEndian(block + 4, b); |
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252 } |
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253 |
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254 // Fetch 4 words from user's buffer into "a", "b", "c", "d" in BIG-endian order |
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255 inline void GetBlockBigEndian(const TUint8* block, TUint32& a, TUint32& b, TUint32& c, TUint32& d) |
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256 { |
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257 GetWordBigEndian(block, a); |
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258 GetWordBigEndian(block + 4, b); |
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259 GetWordBigEndian(block + 8, c); |
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260 GetWordBigEndian(block + 12, d); |
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261 } |
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262 |
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263 // Put 4 words back into user's buffer in BIG-endian order |
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264 inline void PutBlockBigEndian(TUint8* block, TUint32 a, TUint32 b, TUint32 c, TUint32 d) |
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265 { |
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266 PutWordBigEndian(block, a); |
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267 PutWordBigEndian(block + 4, b); |
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268 PutWordBigEndian(block + 8, c); |
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269 PutWordBigEndian(block + 12, d); |
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270 } |
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271 |
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272 #endif // __INLINES_H__ |