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0
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1 /*
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2 crypto.go : crypto-program.
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3 Version : 0.0
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3
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4 Last Change: 2018-10-11 木 13:54:56.
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0
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5
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6 install to: rsearcher_root/
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7 server_root/
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8 */
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9 package main
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10
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11 import (
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3
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12 "crypto/aes"
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13 "crypto/cipher"
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14 "crypto/rand"
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0
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15 "crypto/sha256"
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3
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16 "encoding/csv"
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17 "encoding/hex"
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0
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18 "fmt"
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19 "flag"
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3
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20 "io"
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21 "io/ioutil"
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22 "log"
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0
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23 "os"
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24 )
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25
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26 func main() {
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3
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27 salt := flag.String( "s", "dummysalt", "salt." )
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28
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29 enca := flag.String( "a", "", "encrypt plaintext." )
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30 encb := flag.String( "b", "", "encrypt csv-file." )
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31 coll := flag.String( "c", "", "collate user/password." )
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32
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33 decr := flag.String( "d", "", "deecrypt hhs." )
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34 encr := flag.String( "e", "", "encrypt hhs." )
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35 ghhs := flag.String( "f", "", "get hhs info." )
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0
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36
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37 flag.Parse()
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38
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39 if *enca != "" {
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40 buf := *salt + enc_sha256( *enca ) + *salt
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41 fmt.Println( enc_sha256( buf ) )
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42 os.Exit( 0 ) // done.
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43 }
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44
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45 if *encb != "" {
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3
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46 f, err := os.Open( *encb ); if err != nil {
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47 log.Fatal( err )
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48 }
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49 defer f.Close()
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50
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51 r := csv.NewReader( f )
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52 for {
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53 record, err := r.Read()
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54 if err == io.EOF {
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55 break
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56 }
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57 if err != nil {
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58 log.Fatal( err )
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59 }
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60 buf := *salt + enc_sha256( record[ 1 ] ) + *salt
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61 fmt.Println( record[ 0 ], enc_sha256( buf ) )
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62 }
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63 os.Exit( 0 ) // done.
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64 }
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65
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66 if *coll != "" {
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67 f, err := os.Open( *coll ); if err != nil {
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68 log.Fatal( err )
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69 }
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70 defer f.Close()
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71
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72 if flag.NArg() != 2 {
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73 fmt.Fprintf( os.Stderr, "bad argument\n" )
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74 os.Exit( 1 )
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75 }
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76 user := flag.Arg( 0 )
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77 pw := flag.Arg( 1 )
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78
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79 r := csv.NewReader( f )
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80 r.Comma = ' '
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0
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81 for {
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82 record, err := r.Read()
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83 if err == io.EOF {
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84 break
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85 }
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86 if err != nil {
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87 log.Fatal( err )
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88 }
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3
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89
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90 if record[ 0 ] == user {
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91 buf := *salt + enc_sha256( pw ) + *salt
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92 if record[ 1 ] == enc_sha256( buf ) {
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93 fmt.Println( "valid" )
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94 os.Exit( 39 )
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95 }
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96 }
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0
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97 }
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98 os.Exit( 0 ) // done.
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0
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99 }
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100
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101 key, _ := hex.DecodeString( "f368616e676520746869732070617373" ) // len = 32
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102
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103 if *decr != "" {
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104 f, err := os.Open( *decr ); if err != nil {
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105 log.Fatal( err )
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106 }
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107 defer f.Close()
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108
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109 ciphertext, err := ioutil.ReadAll( f )
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110 if err != nil {
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111 log.Fatal( err )
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112 }
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113
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114 block, err := aes.NewCipher( key )
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115 if err != nil {
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116 panic( err )
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117 }
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118
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119 iv := ciphertext[ :aes.BlockSize ]
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120 plaintext := make( []byte, len( ciphertext ) - aes.BlockSize )
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121 stream := cipher.NewCTR( block, iv )
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122 stream.XORKeyStream( plaintext, ciphertext[ aes.BlockSize: ] )
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123
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124 fmt.Printf( "%s", plaintext )
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125 os.Exit( 0 )
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0
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126 }
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127
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3
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128
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129 if *encr != "" {
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130 f, err := os.Open( *encr ); if err != nil {
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131 log.Fatal( err )
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132 }
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133 defer f.Close()
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134
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135 plaintext, err := ioutil.ReadAll( f )
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136 if err != nil {
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137 log.Fatal( err )
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138 }
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139
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140 block, err := aes.NewCipher( key )
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141 if err != nil {
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142 panic( err )
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143 }
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144
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145 // IV は公開してもいいので先頭につけておく
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146 ciphertext := make( []byte, aes.BlockSize + len( plaintext ) )
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147 iv := ciphertext[ :aes.BlockSize ]
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148 if _, err := io.ReadFull( rand.Reader, iv ); err != nil {
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149 panic( err )
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150 }
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151
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152 stream := cipher.NewCTR( block, iv )
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153 stream.XORKeyStream( ciphertext[ aes.BlockSize: ], plaintext )
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154
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155 fmt.Printf( "%x", ciphertext )
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156 os.Exit( 0 )
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0
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157 }
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158
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3
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159 if *ghhs != "" {
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0
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160 }
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161
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162 fmt.Fprintf( os.Stderr, "bad argument\n" )
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163 os.Exit( 1 )
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164 }
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165
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166 func enc_sha256( text string ) string {
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167 h := sha256.New()
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168 h.Write( []byte( text ) )
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169 return fmt.Sprintf( "%x", h.Sum( nil ) )
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170 }
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171
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