1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include <errno.h>
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12 | #include "internal/cryptlib.h"
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13 | #include <openssl/buffer.h>
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14 | #include <openssl/evp.h>
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15 | #include "internal/bio.h"
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16 |
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17 | static int b64_write(BIO *h, const char *buf, int num);
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18 | static int b64_read(BIO *h, char *buf, int size);
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19 | static int b64_puts(BIO *h, const char *str);
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20 | /*
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21 | * static int b64_gets(BIO *h, char *str, int size);
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22 | */
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23 | static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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24 | static int b64_new(BIO *h);
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25 | static int b64_free(BIO *data);
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26 | static long b64_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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27 | #define B64_BLOCK_SIZE 1024
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28 | #define B64_BLOCK_SIZE2 768
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29 | #define B64_NONE 0
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30 | #define B64_ENCODE 1
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31 | #define B64_DECODE 2
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32 |
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33 | typedef struct b64_struct {
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34 | /*
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35 | * BIO *bio; moved to the BIO structure
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36 | */
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37 | int buf_len;
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38 | int buf_off;
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39 | int tmp_len; /* used to find the start when decoding */
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40 | int tmp_nl; /* If true, scan until '\n' */
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41 | int encode;
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42 | int start; /* have we started decoding yet? */
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43 | int cont; /* <= 0 when finished */
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44 | EVP_ENCODE_CTX *base64;
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45 | char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
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46 | char tmp[B64_BLOCK_SIZE];
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47 | } BIO_B64_CTX;
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48 |
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49 | static const BIO_METHOD methods_b64 = {
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50 | BIO_TYPE_BASE64, "base64 encoding",
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51 | b64_write,
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52 | b64_read,
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53 | b64_puts,
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54 | NULL, /* b64_gets, */
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55 | b64_ctrl,
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56 | b64_new,
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57 | b64_free,
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58 | b64_callback_ctrl,
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59 | };
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60 |
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61 |
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62 | const BIO_METHOD *BIO_f_base64(void)
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63 | {
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64 | return &methods_b64;
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65 | }
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66 |
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67 | static int b64_new(BIO *bi)
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68 | {
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69 | BIO_B64_CTX *ctx;
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70 |
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71 | ctx = OPENSSL_zalloc(sizeof(*ctx));
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72 | if (ctx == NULL)
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73 | return 0;
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74 |
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75 | ctx->cont = 1;
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76 | ctx->start = 1;
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77 | ctx->base64 = EVP_ENCODE_CTX_new();
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78 | if (ctx->base64 == NULL) {
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79 | OPENSSL_free(ctx);
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80 | return 0;
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81 | }
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82 |
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83 | BIO_set_data(bi, ctx);
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84 | BIO_set_init(bi, 1);
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85 |
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86 | return 1;
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87 | }
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88 |
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89 | static int b64_free(BIO *a)
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90 | {
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91 | BIO_B64_CTX *ctx;
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92 | if (a == NULL)
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93 | return 0;
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94 |
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95 | ctx = BIO_get_data(a);
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96 | if (ctx == NULL)
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97 | return 0;
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98 |
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99 | EVP_ENCODE_CTX_free(ctx->base64);
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100 | OPENSSL_free(ctx);
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101 | BIO_set_data(a, NULL);
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102 | BIO_set_init(a, 0);
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103 |
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104 | return 1;
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105 | }
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106 |
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107 | static int b64_read(BIO *b, char *out, int outl)
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108 | {
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109 | int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
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110 | BIO_B64_CTX *ctx;
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111 | unsigned char *p, *q;
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112 | BIO *next;
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113 |
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114 | if (out == NULL)
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115 | return (0);
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116 | ctx = (BIO_B64_CTX *)BIO_get_data(b);
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117 |
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118 | next = BIO_next(b);
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119 | if ((ctx == NULL) || (next == NULL))
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120 | return 0;
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121 |
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122 | BIO_clear_retry_flags(b);
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123 |
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124 | if (ctx->encode != B64_DECODE) {
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125 | ctx->encode = B64_DECODE;
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126 | ctx->buf_len = 0;
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127 | ctx->buf_off = 0;
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128 | ctx->tmp_len = 0;
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129 | EVP_DecodeInit(ctx->base64);
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130 | }
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131 |
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132 | /* First check if there are bytes decoded/encoded */
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133 | if (ctx->buf_len > 0) {
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134 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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135 | i = ctx->buf_len - ctx->buf_off;
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136 | if (i > outl)
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137 | i = outl;
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138 | OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
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139 | memcpy(out, &(ctx->buf[ctx->buf_off]), i);
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140 | ret = i;
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141 | out += i;
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142 | outl -= i;
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143 | ctx->buf_off += i;
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144 | if (ctx->buf_len == ctx->buf_off) {
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145 | ctx->buf_len = 0;
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146 | ctx->buf_off = 0;
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147 | }
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148 | }
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149 |
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150 | /*
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151 | * At this point, we have room of outl bytes and an empty buffer, so we
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152 | * should read in some more.
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153 | */
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154 |
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155 | ret_code = 0;
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156 | while (outl > 0) {
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157 | if (ctx->cont <= 0)
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158 | break;
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159 |
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160 | i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
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161 | B64_BLOCK_SIZE - ctx->tmp_len);
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162 |
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163 | if (i <= 0) {
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164 | ret_code = i;
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165 |
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166 | /* Should we continue next time we are called? */
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167 | if (!BIO_should_retry(next)) {
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168 | ctx->cont = i;
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169 | /* If buffer empty break */
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170 | if (ctx->tmp_len == 0)
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171 | break;
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172 | /* Fall through and process what we have */
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173 | else
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174 | i = 0;
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175 | }
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176 | /* else we retry and add more data to buffer */
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177 | else
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178 | break;
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179 | }
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180 | i += ctx->tmp_len;
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181 | ctx->tmp_len = i;
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182 |
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183 | /*
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184 | * We need to scan, a line at a time until we have a valid line if we
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185 | * are starting.
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186 | */
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187 | if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
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188 | /* ctx->start=1; */
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189 | ctx->tmp_len = 0;
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190 | } else if (ctx->start) {
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191 | q = p = (unsigned char *)ctx->tmp;
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192 | num = 0;
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193 | for (j = 0; j < i; j++) {
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194 | if (*(q++) != '\n')
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195 | continue;
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196 |
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197 | /*
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198 | * due to a previous very long line, we need to keep on
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199 | * scanning for a '\n' before we even start looking for
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200 | * base64 encoded stuff.
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201 | */
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202 | if (ctx->tmp_nl) {
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203 | p = q;
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204 | ctx->tmp_nl = 0;
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205 | continue;
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206 | }
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207 |
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208 | k = EVP_DecodeUpdate(ctx->base64,
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209 | (unsigned char *)ctx->buf,
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210 | &num, p, q - p);
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211 | if ((k <= 0) && (num == 0) && (ctx->start))
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212 | EVP_DecodeInit(ctx->base64);
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213 | else {
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214 | if (p != (unsigned char *)
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215 | &(ctx->tmp[0])) {
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216 | i -= (p - (unsigned char *)
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217 | &(ctx->tmp[0]));
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218 | for (x = 0; x < i; x++)
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219 | ctx->tmp[x] = p[x];
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220 | }
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221 | EVP_DecodeInit(ctx->base64);
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222 | ctx->start = 0;
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223 | break;
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224 | }
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225 | p = q;
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226 | }
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227 |
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228 | /* we fell off the end without starting */
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229 | if ((j == i) && (num == 0)) {
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230 | /*
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231 | * Is this is one long chunk?, if so, keep on reading until a
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232 | * new line.
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233 | */
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234 | if (p == (unsigned char *)&(ctx->tmp[0])) {
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235 | /* Check buffer full */
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236 | if (i == B64_BLOCK_SIZE) {
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237 | ctx->tmp_nl = 1;
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238 | ctx->tmp_len = 0;
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239 | }
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240 | } else if (p != q) { /* finished on a '\n' */
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241 | n = q - p;
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242 | for (ii = 0; ii < n; ii++)
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243 | ctx->tmp[ii] = p[ii];
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244 | ctx->tmp_len = n;
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245 | }
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246 | /* else finished on a '\n' */
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247 | continue;
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248 | } else {
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249 | ctx->tmp_len = 0;
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250 | }
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251 | } else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
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252 | /*
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253 | * If buffer isn't full and we can retry then restart to read in
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254 | * more data.
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255 | */
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256 | continue;
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257 | }
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258 |
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259 | if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
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260 | int z, jj;
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261 |
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262 | jj = i & ~3; /* process per 4 */
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263 | z = EVP_DecodeBlock((unsigned char *)ctx->buf,
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264 | (unsigned char *)ctx->tmp, jj);
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265 | if (jj > 2) {
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266 | if (ctx->tmp[jj - 1] == '=') {
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267 | z--;
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268 | if (ctx->tmp[jj - 2] == '=')
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269 | z--;
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270 | }
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271 | }
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272 | /*
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273 | * z is now number of output bytes and jj is the number consumed
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274 | */
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275 | if (jj != i) {
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276 | memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
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277 | ctx->tmp_len = i - jj;
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278 | }
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279 | ctx->buf_len = 0;
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280 | if (z > 0) {
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281 | ctx->buf_len = z;
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282 | }
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283 | i = z;
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284 | } else {
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285 | i = EVP_DecodeUpdate(ctx->base64,
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286 | (unsigned char *)ctx->buf, &ctx->buf_len,
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287 | (unsigned char *)ctx->tmp, i);
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288 | ctx->tmp_len = 0;
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289 | }
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290 | ctx->buf_off = 0;
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291 | if (i < 0) {
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292 | ret_code = 0;
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293 | ctx->buf_len = 0;
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294 | break;
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295 | }
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296 |
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297 | if (ctx->buf_len <= outl)
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298 | i = ctx->buf_len;
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299 | else
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300 | i = outl;
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301 |
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302 | memcpy(out, ctx->buf, i);
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303 | ret += i;
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304 | ctx->buf_off = i;
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305 | if (ctx->buf_off == ctx->buf_len) {
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306 | ctx->buf_len = 0;
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307 | ctx->buf_off = 0;
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308 | }
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309 | outl -= i;
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310 | out += i;
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311 | }
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312 | /* BIO_clear_retry_flags(b); */
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313 | BIO_copy_next_retry(b);
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314 | return ((ret == 0) ? ret_code : ret);
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315 | }
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316 |
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317 | static int b64_write(BIO *b, const char *in, int inl)
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318 | {
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319 | int ret = 0;
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320 | int n;
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321 | int i;
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322 | BIO_B64_CTX *ctx;
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323 | BIO *next;
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324 |
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325 | ctx = (BIO_B64_CTX *)BIO_get_data(b);
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326 | next = BIO_next(b);
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327 | if ((ctx == NULL) || (next == NULL))
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328 | return 0;
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329 |
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330 | BIO_clear_retry_flags(b);
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331 |
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332 | if (ctx->encode != B64_ENCODE) {
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333 | ctx->encode = B64_ENCODE;
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334 | ctx->buf_len = 0;
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335 | ctx->buf_off = 0;
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336 | ctx->tmp_len = 0;
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337 | EVP_EncodeInit(ctx->base64);
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338 | }
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339 |
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340 | OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
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341 | OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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342 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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343 | n = ctx->buf_len - ctx->buf_off;
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344 | while (n > 0) {
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345 | i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
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346 | if (i <= 0) {
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347 | BIO_copy_next_retry(b);
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348 | return (i);
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349 | }
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350 | OPENSSL_assert(i <= n);
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351 | ctx->buf_off += i;
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352 | OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
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353 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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354 | n -= i;
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355 | }
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356 | /* at this point all pending data has been written */
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357 | ctx->buf_off = 0;
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358 | ctx->buf_len = 0;
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359 |
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360 | if ((in == NULL) || (inl <= 0))
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361 | return (0);
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362 |
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363 | while (inl > 0) {
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364 | n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
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365 |
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366 | if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
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367 | if (ctx->tmp_len > 0) {
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368 | OPENSSL_assert(ctx->tmp_len <= 3);
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369 | n = 3 - ctx->tmp_len;
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370 | /*
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371 | * There's a theoretical possibility for this
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372 | */
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373 | if (n > inl)
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374 | n = inl;
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375 | memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
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376 | ctx->tmp_len += n;
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377 | ret += n;
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378 | if (ctx->tmp_len < 3)
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379 | break;
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380 | ctx->buf_len =
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381 | EVP_EncodeBlock((unsigned char *)ctx->buf,
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382 | (unsigned char *)ctx->tmp, ctx->tmp_len);
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383 | OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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384 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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385 | /*
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386 | * Since we're now done using the temporary buffer, the
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387 | * length should be 0'd
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388 | */
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389 | ctx->tmp_len = 0;
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390 | } else {
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391 | if (n < 3) {
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392 | memcpy(ctx->tmp, in, n);
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393 | ctx->tmp_len = n;
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394 | ret += n;
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395 | break;
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396 | }
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397 | n -= n % 3;
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398 | ctx->buf_len =
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399 | EVP_EncodeBlock((unsigned char *)ctx->buf,
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400 | (const unsigned char *)in, n);
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401 | OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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402 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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403 | ret += n;
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404 | }
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405 | } else {
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406 | if (!EVP_EncodeUpdate(ctx->base64,
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407 | (unsigned char *)ctx->buf, &ctx->buf_len,
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408 | (unsigned char *)in, n))
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409 | return ((ret == 0) ? -1 : ret);
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410 | OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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411 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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412 | ret += n;
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413 | }
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414 | inl -= n;
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415 | in += n;
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416 |
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417 | ctx->buf_off = 0;
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418 | n = ctx->buf_len;
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419 | while (n > 0) {
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420 | i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
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421 | if (i <= 0) {
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422 | BIO_copy_next_retry(b);
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423 | return ((ret == 0) ? i : ret);
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424 | }
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425 | OPENSSL_assert(i <= n);
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426 | n -= i;
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427 | ctx->buf_off += i;
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428 | OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
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429 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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430 | }
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431 | ctx->buf_len = 0;
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432 | ctx->buf_off = 0;
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433 | }
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434 | return (ret);
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435 | }
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436 |
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437 | static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)
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438 | {
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439 | BIO_B64_CTX *ctx;
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440 | long ret = 1;
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441 | int i;
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442 | BIO *next;
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443 |
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444 | ctx = (BIO_B64_CTX *)BIO_get_data(b);
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445 | next = BIO_next(b);
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446 | if ((ctx == NULL) || (next == NULL))
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447 | return 0;
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448 |
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449 | switch (cmd) {
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450 | case BIO_CTRL_RESET:
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451 | ctx->cont = 1;
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452 | ctx->start = 1;
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453 | ctx->encode = B64_NONE;
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454 | ret = BIO_ctrl(next, cmd, num, ptr);
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455 | break;
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456 | case BIO_CTRL_EOF: /* More to read */
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457 | if (ctx->cont <= 0)
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458 | ret = 1;
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459 | else
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460 | ret = BIO_ctrl(next, cmd, num, ptr);
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461 | break;
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462 | case BIO_CTRL_WPENDING: /* More to write in buffer */
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463 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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464 | ret = ctx->buf_len - ctx->buf_off;
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465 | if ((ret == 0) && (ctx->encode != B64_NONE)
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466 | && (EVP_ENCODE_CTX_num(ctx->base64) != 0))
|
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467 | ret = 1;
|
---|
468 | else if (ret <= 0)
|
---|
469 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
470 | break;
|
---|
471 | case BIO_CTRL_PENDING: /* More to read in buffer */
|
---|
472 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
---|
473 | ret = ctx->buf_len - ctx->buf_off;
|
---|
474 | if (ret <= 0)
|
---|
475 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
476 | break;
|
---|
477 | case BIO_CTRL_FLUSH:
|
---|
478 | /* do a final write */
|
---|
479 | again:
|
---|
480 | while (ctx->buf_len != ctx->buf_off) {
|
---|
481 | i = b64_write(b, NULL, 0);
|
---|
482 | if (i < 0)
|
---|
483 | return i;
|
---|
484 | }
|
---|
485 | if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
|
---|
486 | if (ctx->tmp_len != 0) {
|
---|
487 | ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
|
---|
488 | (unsigned char *)ctx->tmp,
|
---|
489 | ctx->tmp_len);
|
---|
490 | ctx->buf_off = 0;
|
---|
491 | ctx->tmp_len = 0;
|
---|
492 | goto again;
|
---|
493 | }
|
---|
494 | } else if (ctx->encode != B64_NONE
|
---|
495 | && EVP_ENCODE_CTX_num(ctx->base64) != 0) {
|
---|
496 | ctx->buf_off = 0;
|
---|
497 | EVP_EncodeFinal(ctx->base64,
|
---|
498 | (unsigned char *)ctx->buf, &(ctx->buf_len));
|
---|
499 | /* push out the bytes */
|
---|
500 | goto again;
|
---|
501 | }
|
---|
502 | /* Finally flush the underlying BIO */
|
---|
503 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
504 | break;
|
---|
505 |
|
---|
506 | case BIO_C_DO_STATE_MACHINE:
|
---|
507 | BIO_clear_retry_flags(b);
|
---|
508 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
509 | BIO_copy_next_retry(b);
|
---|
510 | break;
|
---|
511 |
|
---|
512 | case BIO_CTRL_DUP:
|
---|
513 | break;
|
---|
514 | case BIO_CTRL_INFO:
|
---|
515 | case BIO_CTRL_GET:
|
---|
516 | case BIO_CTRL_SET:
|
---|
517 | default:
|
---|
518 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
519 | break;
|
---|
520 | }
|
---|
521 | return ret;
|
---|
522 | }
|
---|
523 |
|
---|
524 | static long b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
|
---|
525 | {
|
---|
526 | long ret = 1;
|
---|
527 | BIO *next = BIO_next(b);
|
---|
528 |
|
---|
529 | if (next == NULL)
|
---|
530 | return 0;
|
---|
531 | switch (cmd) {
|
---|
532 | default:
|
---|
533 | ret = BIO_callback_ctrl(next, cmd, fp);
|
---|
534 | break;
|
---|
535 | }
|
---|
536 | return (ret);
|
---|
537 | }
|
---|
538 |
|
---|
539 | static int b64_puts(BIO *b, const char *str)
|
---|
540 | {
|
---|
541 | return b64_write(b, str, strlen(str));
|
---|
542 | }
|
---|