1 | /*
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2 | * sha1.c
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3 | *
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4 | * Originally witten by Steve Reid <steve@edmweb.com>
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5 | *
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6 | * Modified by Aaron D. Gifford <agifford@infowest.com>
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7 | *
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8 | * NO COPYRIGHT - THIS IS 100% IN THE PUBLIC DOMAIN
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9 | *
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10 | * The original unmodified version is available at:
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11 | * ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
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12 | *
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13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTORS ``AS IS'' AND
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14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTORS BE LIABLE
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17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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23 | * SUCH DAMAGE.
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24 | */
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25 |
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26 | #include <string.h>
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27 |
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28 | #include "sha1.h"
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29 |
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30 | #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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31 |
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32 | /* blk0() and blk() perform the initial expand. */
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33 | /* I got the idea of expanding during the round function from SSLeay */
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34 |
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35 | #ifdef LITTLE_ENDIAN
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36 | #define blk0(i) (block->l[i] = (rol(block->l[i],24)&(sha1_quadbyte)0xFF00FF00) \
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37 | |(rol(block->l[i],8)&(sha1_quadbyte)0x00FF00FF))
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38 | #else
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39 | #define blk0(i) block->l[i]
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40 | #endif
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41 |
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42 | #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
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43 | ^block->l[(i+2)&15]^block->l[i&15],1))
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44 |
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45 | /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
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46 | #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
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47 | #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
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48 | #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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49 | #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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50 | #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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51 |
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52 | typedef union _BYTE64QUAD16 {
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53 | sha1_byte c[64];
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54 | sha1_quadbyte l[16];
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55 | } BYTE64QUAD16;
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56 |
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57 | /* Hash a single 512-bit block. This is the core of the algorithm. */
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58 | void SHA1_Transform(sha1_quadbyte state[5], sha1_byte buffer[64]) {
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59 | sha1_quadbyte a, b, c, d, e;
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60 | BYTE64QUAD16 src;
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61 | BYTE64QUAD16 *block;
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62 |
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63 | /* slow but cast-align */
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64 | memcpy(src.c, buffer, sizeof(sha1_byte) * 64);
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65 | block = &src;
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66 | /* Copy context->state[] to working vars */
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67 | a = state[0];
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68 | b = state[1];
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69 | c = state[2];
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70 | d = state[3];
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71 | e = state[4];
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72 | /* 4 rounds of 20 operations each. Loop unrolled. */
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73 | R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
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74 | R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
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75 | R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
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76 | R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
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77 | R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
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78 | R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
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79 | R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
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80 | R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
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81 | R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
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82 | R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
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83 | R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
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84 | R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
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85 | R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
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86 | R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
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87 | R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
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88 | R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
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89 | R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
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90 | R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
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91 | R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
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92 | R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
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93 | /* Add the working vars back into context.state[] */
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94 | state[0] += a;
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95 | state[1] += b;
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96 | state[2] += c;
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97 | state[3] += d;
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98 | state[4] += e;
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99 | /* Wipe variables */
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100 | a = b = c = d = e = 0;
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101 | }
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102 |
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103 |
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104 | /* SHA1_Init - Initialize new context */
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105 | void SHA1_Init(SHA_CTX* context) {
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106 | /* SHA1 initialization constants */
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107 | context->state[0] = 0x67452301;
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108 | context->state[1] = 0xEFCDAB89;
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109 | context->state[2] = 0x98BADCFE;
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110 | context->state[3] = 0x10325476;
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111 | context->state[4] = 0xC3D2E1F0;
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112 | context->count[0] = context->count[1] = 0;
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113 | }
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114 |
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115 | /* Run your data through this. */
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116 | void SHA1_Update(SHA_CTX *context, sha1_byte *data, unsigned int len) {
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117 | unsigned int i, j;
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118 |
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119 | j = (context->count[0] >> 3) & 63;
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120 | if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
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121 | context->count[1] += (len >> 29);
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122 | if ((j + len) > 63) {
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123 | memcpy(&context->buffer[j], data, (i = 64-j));
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124 | SHA1_Transform(context->state, context->buffer);
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125 | for ( ; i + 63 < len; i += 64) {
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126 | SHA1_Transform(context->state, &data[i]);
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127 | }
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128 | j = 0;
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129 | }
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130 | else i = 0;
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131 | memcpy(&context->buffer[j], &data[i], len - i);
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132 | }
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133 |
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134 |
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135 | /* Add padding and return the message digest. */
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136 | void SHA1_Final(sha1_byte digest[SHA1_DIGEST_LENGTH], SHA_CTX *context) {
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137 | sha1_quadbyte i, j;
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138 | sha1_byte finalcount[8];
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139 |
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140 | for (i = 0; i < 8; i++) {
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141 | finalcount[i] = (sha1_byte)((context->count[(i >= 4 ? 0 : 1)]
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142 | >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
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143 | }
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144 | SHA1_Update(context, (sha1_byte *)"\200", 1);
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145 | while ((context->count[0] & 504) != 448) {
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146 | SHA1_Update(context, (sha1_byte *)"\0", 1);
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147 | }
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148 | /* Should cause a SHA1_Transform() */
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149 | SHA1_Update(context, finalcount, 8);
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150 | for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
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151 | digest[i] = (sha1_byte)
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152 | ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
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153 | }
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154 | /* Wipe variables */
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155 | i = j = 0;
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156 | memset(context->buffer, 0, SHA1_BLOCK_LENGTH);
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157 | memset(context->state, 0, SHA1_DIGEST_LENGTH);
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158 | memset(context->count, 0, 8);
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159 | memset(&finalcount, 0, 8);
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160 | }
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