[331] | 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);
|
---|
| 445 | next = BIO_next(b);
|
---|
| 446 | if ((ctx == NULL) || (next == NULL))
|
---|
| 447 | return 0;
|
---|
| 448 |
|
---|
| 449 | switch (cmd) {
|
---|
| 450 | case BIO_CTRL_RESET:
|
---|
| 451 | ctx->cont = 1;
|
---|
| 452 | ctx->start = 1;
|
---|
| 453 | ctx->encode = B64_NONE;
|
---|
| 454 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
| 455 | break;
|
---|
| 456 | case BIO_CTRL_EOF: /* More to read */
|
---|
| 457 | if (ctx->cont <= 0)
|
---|
| 458 | ret = 1;
|
---|
| 459 | else
|
---|
| 460 | ret = BIO_ctrl(next, cmd, num, ptr);
|
---|
| 461 | break;
|
---|
| 462 | case BIO_CTRL_WPENDING: /* More to write in buffer */
|
---|
| 463 | OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
---|
| 464 | ret = ctx->buf_len - ctx->buf_off;
|
---|
| 465 | if ((ret == 0) && (ctx->encode != B64_NONE)
|
---|
| 466 | && (EVP_ENCODE_CTX_num(ctx->base64) != 0))
|
---|
| 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 | }
|
---|