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3895
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1
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2 /*
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3 * An internal implementation, based on Alexander Peslyak's
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4 * public domain implementation:
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5 * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
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6 * It is not expected to be optimal and is used only
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7 * if no MD5 implementation was found in system.
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8 */
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_md5.h>
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14
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15
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16 #if !(NGX_HAVE_MD5)
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17
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18 static const u_char *ngx_md5_body(ngx_md5_t *ctx, const u_char *data,
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19 size_t size);
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20
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21
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22 void
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23 ngx_md5_init(ngx_md5_t *ctx)
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24 {
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25 ctx->a = 0x67452301;
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26 ctx->b = 0xefcdab89;
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27 ctx->c = 0x98badcfe;
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28 ctx->d = 0x10325476;
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29
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30 ctx->bytes = 0;
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31 }
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32
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33
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34 void
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35 ngx_md5_update(ngx_md5_t *ctx, const u_char *data, size_t size)
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36 {
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37 size_t used, free;
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38
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39 used = ctx->bytes & 0x3f;
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40 ctx->bytes += size;
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41
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42 if (used) {
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43 free = 64 - used;
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44
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45 if (size < free) {
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46 ngx_memcpy(&ctx->buffer[used], data, size);
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47 return;
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48 }
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49
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50 ngx_memcpy(&ctx->buffer[used], data, free);
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51 data = (u_char *)data + free;
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52 size -= free;
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53 (void) ngx_md5_body(ctx, ctx->buffer, 64);
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54 }
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55
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56 if (size >= 64) {
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57 data = ngx_md5_body(ctx, data, size & ~(size_t) 0x3f);
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58 size &= 0x3f;
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59 }
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60
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61 ngx_memcpy(ctx->buffer, data, size);
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62 }
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63
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64
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65 void
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66 ngx_md5_final(u_char result[16], ngx_md5_t *ctx)
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67 {
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68 size_t used, free;
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69
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70 used = ctx->bytes & 0x3f;
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71
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72 ctx->buffer[used++] = 0x80;
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73
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74 free = 64 - used;
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75
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76 if (free < 8) {
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77 ngx_memzero(&ctx->buffer[used], free);
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78 (void) ngx_md5_body(ctx, ctx->buffer, 64);
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79 used = 0;
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80 free = 64;
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81 }
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82
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83 ngx_memzero(&ctx->buffer[used], free - 8);
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84
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85 ctx->bytes <<= 3;
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86 ctx->buffer[56] = ctx->bytes;
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87 ctx->buffer[57] = ctx->bytes >> 8;
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88 ctx->buffer[58] = ctx->bytes >> 16;
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89 ctx->buffer[59] = ctx->bytes >> 24;
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90 ctx->buffer[60] = ctx->bytes >> 32;
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91 ctx->buffer[61] = ctx->bytes >> 40;
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92 ctx->buffer[62] = ctx->bytes >> 48;
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93 ctx->buffer[63] = ctx->bytes >> 56;
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94
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95 (void) ngx_md5_body(ctx, ctx->buffer, 64);
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96
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97 result[0] = ctx->a;
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98 result[1] = ctx->a >> 8;
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99 result[2] = ctx->a >> 16;
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100 result[3] = ctx->a >> 24;
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101 result[4] = ctx->b;
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102 result[5] = ctx->b >> 8;
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103 result[6] = ctx->b >> 16;
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104 result[7] = ctx->b >> 24;
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105 result[8] = ctx->c;
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106 result[9] = ctx->c >> 8;
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107 result[10] = ctx->c >> 16;
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108 result[11] = ctx->c >> 24;
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109 result[12] = ctx->d;
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110 result[13] = ctx->d >> 8;
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111 result[14] = ctx->d >> 16;
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112 result[15] = ctx->d >> 24;
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113
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114 ngx_memzero(ctx, sizeof(*ctx));
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115 }
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116
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117
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118 /*
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119 * The basic MD5 functions.
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120 *
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121 * F and G are optimized compared to their RFC 1321 definitions for
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122 * architectures that lack an AND-NOT instruction, just like in
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123 * Colin Plumb's implementation.
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124 */
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125
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126 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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127 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
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128 #define H(x, y, z) ((x) ^ (y) ^ (z))
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129 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
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130
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131 /*
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132 * The MD5 transformation for all four rounds.
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133 */
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134
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135 #define STEP(f, a, b, c, d, x, t, s) \
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136 (a) += f((b), (c), (d)) + (x) + (t); \
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137 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
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138 (a) += (b)
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139
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140 /*
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141 * SET() reads 4 input bytes in little-endian byte order and stores them
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142 * in a properly aligned word in host byte order.
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143 *
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144 * The check for little-endian architectures that tolerate unaligned
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145 * memory accesses is just an optimization. Nothing will break if it
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146 * does not work.
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147 */
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148
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149 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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150
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151 #define SET(n) (*(uint32_t *) &p[n * 4])
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152 #define GET(n) (*(uint32_t *) &p[n * 4])
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153
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154 #else
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155
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156 #define SET(n) \
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157 (block[n] = \
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158 (uint32_t) p[n * 4] | \
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159 ((uint32_t) p[n * 4 + 1] << 8) | \
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160 ((uint32_t) p[n * 4 + 2] << 16) | \
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161 ((uint32_t) p[n * 4 + 3] << 24))
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162
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163 #define GET(n) block[n]
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164
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165 #endif
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166
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167
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168 /*
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169 * This processes one or more 64-byte data blocks, but does not update
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170 * the bit counters. There are no alignment requirements.
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171 */
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172
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173 static const u_char *
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174 ngx_md5_body(ngx_md5_t *ctx, const u_char *data, size_t size)
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175 {
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176 uint32_t a, b, c, d;
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177 uint32_t saved_a, saved_b, saved_c, saved_d;
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178 const u_char *p;
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179 #if !(NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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180 uint32_t block[16];
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181 #endif
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182
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183 p = data;
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184
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185 a = ctx->a;
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186 b = ctx->b;
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187 c = ctx->c;
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188 d = ctx->d;
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189
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190 do {
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191 saved_a = a;
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192 saved_b = b;
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193 saved_c = c;
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194 saved_d = d;
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195
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196 /* Round 1 */
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197
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198 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7);
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199 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12);
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200 STEP(F, c, d, a, b, SET(2), 0x242070db, 17);
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201 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22);
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202 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7);
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203 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12);
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204 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17);
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205 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22);
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206 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7);
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207 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12);
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208 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17);
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209 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22);
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210 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7);
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211 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12);
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212 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17);
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213 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22);
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214
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215 /* Round 2 */
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216
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217 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5);
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218 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9);
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219 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14);
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220 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20);
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221 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5);
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222 STEP(G, d, a, b, c, GET(10), 0x02441453, 9);
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223 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14);
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224 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20);
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225 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5);
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226 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9);
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227 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14);
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228 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20);
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229 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5);
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230 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9);
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231 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14);
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232 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20);
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233
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234 /* Round 3 */
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235
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236 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4);
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237 STEP(H, d, a, b, c, GET(8), 0x8771f681, 11);
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238 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16);
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239 STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23);
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240 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4);
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241 STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11);
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242 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16);
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243 STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23);
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244 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4);
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245 STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11);
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246 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16);
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247 STEP(H, b, c, d, a, GET(6), 0x04881d05, 23);
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248 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4);
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249 STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11);
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250 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16);
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251 STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23);
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252
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253 /* Round 4 */
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254
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255 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6);
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256 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10);
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257 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15);
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258 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21);
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259 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6);
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260 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10);
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261 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15);
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262 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21);
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263 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6);
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264 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10);
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265 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15);
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266 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21);
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267 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6);
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268 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10);
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269 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15);
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270 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21);
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271
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272 a += saved_a;
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273 b += saved_b;
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274 c += saved_c;
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275 d += saved_d;
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276
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277 p += 64;
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278
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279 } while (size -= 64);
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280
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281 ctx->a = a;
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282 ctx->b = b;
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283 ctx->c = c;
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284 ctx->d = d;
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285
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286 return p;
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287 }
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288
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289 #endif
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