1 | /* crypto/bn/bn_print.c */
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2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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3 | * All rights reserved.
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4 | *
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5 | * This package is an SSL implementation written
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6 | * by Eric Young (eay@cryptsoft.com).
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7 | * The implementation was written so as to conform with Netscapes SSL.
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8 | *
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9 | * This library is free for commercial and non-commercial use as long as
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10 | * the following conditions are aheared to. The following conditions
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11 | * apply to all code found in this distribution, be it the RC4, RSA,
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12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation
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13 | * included with this distribution is covered by the same copyright terms
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14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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15 | *
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16 | * Copyright remains Eric Young's, and as such any Copyright notices in
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17 | * the code are not to be removed.
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18 | * If this package is used in a product, Eric Young should be given attribution
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19 | * as the author of the parts of the library used.
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20 | * This can be in the form of a textual message at program startup or
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21 | * in documentation (online or textual) provided with the package.
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22 | *
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23 | * Redistribution and use in source and binary forms, with or without
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24 | * modification, are permitted provided that the following conditions
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25 | * are met:
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26 | * 1. Redistributions of source code must retain the copyright
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27 | * notice, this list of conditions and the following disclaimer.
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28 | * 2. Redistributions in binary form must reproduce the above copyright
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29 | * notice, this list of conditions and the following disclaimer in the
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30 | * documentation and/or other materials provided with the distribution.
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31 | * 3. All advertising materials mentioning features or use of this software
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32 | * must display the following acknowledgement:
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33 | * "This product includes cryptographic software written by
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34 | * Eric Young (eay@cryptsoft.com)"
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35 | * The word 'cryptographic' can be left out if the rouines from the library
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36 | * being used are not cryptographic related :-).
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37 | * 4. If you include any Windows specific code (or a derivative thereof) from
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38 | * the apps directory (application code) you must include an acknowledgement:
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39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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40 | *
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41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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51 | * SUCH DAMAGE.
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52 | *
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53 | * The licence and distribution terms for any publically available version or
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54 | * derivative of this code cannot be changed. i.e. this code cannot simply be
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55 | * copied and put under another distribution licence
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56 | * [including the GNU Public Licence.]
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57 | */
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58 |
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59 | #include <stdio.h>
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60 | #include <ctype.h>
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61 | #include "bn_lcl.h"
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62 | #include "buffer.h"
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63 | #include "openssl_mods.h"
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64 |
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65 | static const char *Hex="0123456789ABCDEF";
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66 |
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67 | /* Must 'OPENSSL_free' the returned data */
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68 | char *BN_bn2hex(const BIGNUM *a)
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69 | {
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70 | int i,j,v,z=0;
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71 | char *buf;
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72 | char *p;
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73 |
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74 | buf=(char *)OPENSSL_malloc(a->top*BN_BYTES*2+2);
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75 | if (buf == NULL)
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76 | {
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77 | goto err;
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78 | }
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79 | p=buf;
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80 | if (a->neg) *(p++)='-';
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81 | if (a->top == 0) *(p++)='0';
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82 | for (i=a->top-1; i >=0; i--)
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83 | {
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84 | for (j=BN_BITS2-8; j >= 0; j-=8)
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85 | {
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86 | /* strip leading zeros */
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87 | v=((int)(a->d[i]>>(long)j))&0xff;
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88 | if (z || (v != 0))
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89 | {
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90 | *(p++)=Hex[v>>4];
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91 | *(p++)=Hex[v&0x0f];
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92 | z=1;
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93 | }
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94 | }
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95 | }
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96 | *p='\0';
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97 | err:
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98 | return(buf);
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99 | }
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100 |
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101 | /* Must 'OPENSSL_free' the returned data */
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102 | char *BN_bn2dec(const BIGNUM *a)
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103 | {
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104 | int i=0,num;
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105 | char *buf=NULL;
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106 | char *p;
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107 | BIGNUM *t=NULL;
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108 | BN_ULONG *bn_data=NULL,*lp;
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109 |
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110 | i=BN_num_bits(a)*3;
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111 | num=(i/10+i/1000+3)+1;
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112 | bn_data=(BN_ULONG *)OPENSSL_malloc((num/BN_DEC_NUM+1)*sizeof(BN_ULONG));
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113 | buf=(char *)OPENSSL_malloc(num+3);
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114 | if ((buf == NULL) || (bn_data == NULL))
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115 | {
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116 | goto err;
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117 | }
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118 | if ((t=BN_dup(a)) == NULL) goto err;
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119 |
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120 | p=buf;
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121 | lp=bn_data;
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122 | if (t->neg) *(p++)='-';
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123 | if (t->top == 0)
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124 | {
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125 | *(p++)='0';
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126 | *(p++)='\0';
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127 | }
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128 | else
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129 | {
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130 | i=0;
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131 | while (!BN_is_zero(t))
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132 | {
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133 | *lp=BN_div_word(t,BN_DEC_CONV);
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134 | lp++;
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135 | }
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136 | lp--;
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137 | /* We now have a series of blocks, BN_DEC_NUM chars
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138 | * in length, where the last one needs truncation.
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139 | * The blocks need to be reversed in order. */
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140 | sprintf(p,BN_DEC_FMT1,*lp);
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141 | while (*p) p++;
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142 | while (lp != bn_data)
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143 | {
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144 | lp--;
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145 | sprintf(p,BN_DEC_FMT2,*lp);
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146 | while (*p) p++;
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147 | }
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148 | }
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149 | err:
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150 | if (bn_data != NULL) OPENSSL_free(bn_data);
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151 | if (t != NULL) BN_free(t);
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152 | return(buf);
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153 | }
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154 |
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155 | int BN_hex2bn(BIGNUM **bn, const char *a)
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156 | {
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157 | BIGNUM *ret=NULL;
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158 | BN_ULONG l=0;
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159 | int neg=0,h,m,i,j,k,c;
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160 | int num;
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161 |
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162 | if ((a == NULL) || (*a == '\0')) return(0);
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163 |
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164 | if (*a == '-') { neg=1; a++; }
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165 |
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166 | for (i=0; isxdigit((unsigned char) a[i]); i++)
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167 | ;
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168 |
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169 | num=i+neg;
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170 | if (bn == NULL) return(num);
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171 |
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172 | /* a is the start of the hex digits, and it is 'i' long */
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173 | if (*bn == NULL)
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174 | {
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175 | if ((ret=BN_new()) == NULL) return(0);
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176 | }
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177 | else
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178 | {
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179 | ret= *bn;
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180 | BN_zero(ret);
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181 | }
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182 |
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183 | /* i is the number of hex digests; */
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184 | if (bn_expand(ret,i*4) == NULL) goto err;
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185 |
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186 | j=i; /* least significant 'hex' */
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187 | m=0;
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188 | h=0;
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189 | while (j > 0)
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190 | {
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191 | m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j;
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192 | l=0;
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193 | for (;;)
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194 | {
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195 | c=a[j-m];
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196 | if ((c >= '0') && (c <= '9')) k=c-'0';
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197 | else if ((c >= 'a') && (c <= 'f')) k=c-'a'+10;
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198 | else if ((c >= 'A') && (c <= 'F')) k=c-'A'+10;
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199 | else k=0; /* paranoia */
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200 | l=(l<<4)|k;
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201 |
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202 | if (--m <= 0)
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203 | {
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204 | ret->d[h++]=l;
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205 | break;
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206 | }
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207 | }
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208 | j-=(BN_BYTES*2);
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209 | }
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210 | ret->top=h;
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211 | bn_fix_top(ret);
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212 | ret->neg=neg;
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213 |
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214 | *bn=ret;
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215 | return(num);
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216 | err:
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217 | if (*bn == NULL) BN_free(ret);
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218 | return(0);
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219 | }
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220 |
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221 | int BN_dec2bn(BIGNUM **bn, const char *a)
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222 | {
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223 | BIGNUM *ret=NULL;
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224 | BN_ULONG l=0;
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225 | int neg=0,i,j;
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226 | int num;
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227 |
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228 | if ((a == NULL) || (*a == '\0')) return(0);
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229 | if (*a == '-') { neg=1; a++; }
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230 |
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231 | for (i=0; isdigit((unsigned char) a[i]); i++)
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232 | ;
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233 |
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234 | num=i+neg;
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235 | if (bn == NULL) return(num);
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236 |
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237 | /* a is the start of the digits, and it is 'i' long.
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238 | * We chop it into BN_DEC_NUM digits at a time */
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239 | if (*bn == NULL)
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240 | {
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241 | if ((ret=BN_new()) == NULL) return(0);
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242 | }
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243 | else
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244 | {
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245 | ret= *bn;
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246 | BN_zero(ret);
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247 | }
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248 |
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249 | /* i is the number of digests, a bit of an over expand; */
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250 | if (bn_expand(ret,i*4) == NULL) goto err;
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251 |
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252 | j=BN_DEC_NUM-(i%BN_DEC_NUM);
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253 | if (j == BN_DEC_NUM) j=0;
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254 | l=0;
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255 | while (*a)
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256 | {
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257 | l*=10;
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258 | l+= *a-'0';
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259 | a++;
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260 | if (++j == BN_DEC_NUM)
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261 | {
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262 | BN_mul_word(ret,BN_DEC_CONV);
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263 | BN_add_word(ret,l);
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264 | l=0;
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265 | j=0;
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266 | }
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267 | }
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268 | ret->neg=neg;
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269 |
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270 | bn_fix_top(ret);
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271 | *bn=ret;
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272 | return(num);
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273 | err:
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274 | if (*bn == NULL) BN_free(ret);
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275 | return(0);
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276 | }
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277 |
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278 | #ifdef BN_DEBUG
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279 | void bn_dump1(FILE *o, const char *a, BN_ULONG *b,int n)
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280 | {
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281 | int i;
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282 | fprintf(o, "%s=", a);
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283 | for (i=n-1;i>=0;i--)
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284 | fprintf(o, "%08lX", b[i]); /* assumes 32-bit BN_ULONG */
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285 | fprintf(o, "\n");
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286 | }
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287 | #endif
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