291 lines
6.2 KiB
C
291 lines
6.2 KiB
C
/*
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* This file Copyright (C) 2007-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <stdarg.h>
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#include <stdlib.h> /* abs(), srand(), rand() */
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#include <string.h> /* memcpy(), memmove(), memset(), strcmp(), strlen() */
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#include <b64/cdecode.h>
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#include <b64/cencode.h>
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "tr-assert.h"
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#include "utils.h"
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/***
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****
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***/
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void tr_dh_align_key(uint8_t* key_buffer, size_t key_size, size_t buffer_size)
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{
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TR_ASSERT(key_size <= buffer_size);
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/* DH can generate key sizes that are smaller than the size of
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key buffer with exponentially decreasing probability, in which case
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the msb's of key buffer need to be zeroed appropriately. */
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if (key_size < buffer_size)
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{
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size_t const offset = buffer_size - key_size;
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memmove(key_buffer + offset, key_buffer, key_size);
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memset(key_buffer, 0, offset);
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}
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}
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/***
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****
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***/
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bool tr_sha1(uint8_t* hash, void const* data1, int data1_length, ...)
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{
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tr_sha1_ctx_t sha;
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if ((sha = tr_sha1_init()) == NULL)
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{
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return false;
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}
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if (tr_sha1_update(sha, data1, data1_length))
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{
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va_list vl;
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void const* data;
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va_start(vl, data1_length);
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while ((data = va_arg(vl, void const*)) != NULL)
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{
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int const data_length = va_arg(vl, int);
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TR_ASSERT(data_length >= 0);
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if (!tr_sha1_update(sha, data, data_length))
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{
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break;
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}
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}
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va_end(vl);
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/* did we reach the end of argument list? */
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if (data == NULL)
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{
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return tr_sha1_final(sha, hash);
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}
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}
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tr_sha1_final(sha, NULL);
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return false;
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}
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/***
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****
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***/
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int tr_rand_int(int upper_bound)
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{
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TR_ASSERT(upper_bound > 0);
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unsigned int noise;
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if (tr_rand_buffer(&noise, sizeof(noise)))
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{
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return noise % upper_bound;
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}
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/* fall back to a weaker implementation... */
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return tr_rand_int_weak(upper_bound);
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}
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int tr_rand_int_weak(int upper_bound)
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{
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TR_ASSERT(upper_bound > 0);
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static bool init = false;
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if (!init)
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{
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srand(tr_time_msec());
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init = true;
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}
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return rand() % upper_bound;
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}
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/***
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****
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***/
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char* tr_ssha1(char const* plain_text)
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{
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TR_ASSERT(plain_text != NULL);
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enum
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{
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saltval_len = 8,
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salter_len = 64
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};
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static char const* salter =
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"0123456789"
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"./";
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unsigned char salt[saltval_len];
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uint8_t sha[SHA_DIGEST_LENGTH];
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char buf[2 * SHA_DIGEST_LENGTH + saltval_len + 2];
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tr_rand_buffer(salt, saltval_len);
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for (size_t i = 0; i < saltval_len; ++i)
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{
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salt[i] = salter[salt[i] % salter_len];
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}
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tr_sha1(sha, plain_text, (int)strlen(plain_text), salt, saltval_len, NULL);
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tr_sha1_to_hex(&buf[1], sha);
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memcpy(&buf[1 + 2 * SHA_DIGEST_LENGTH], &salt, saltval_len);
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buf[1 + 2 * SHA_DIGEST_LENGTH + saltval_len] = '\0';
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buf[0] = '{'; /* signal that this is a hash. this makes saving/restoring easier */
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return tr_strdup(buf);
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}
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bool tr_ssha1_matches(char const* ssha1, char const* plain_text)
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{
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TR_ASSERT(ssha1 != NULL);
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TR_ASSERT(plain_text != NULL);
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size_t const brace_len = 1;
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size_t const brace_and_hash_len = brace_len + 2 * SHA_DIGEST_LENGTH;
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size_t const source_len = strlen(ssha1);
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if (source_len < brace_and_hash_len || ssha1[0] != '{')
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{
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return false;
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}
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/* extract the salt */
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char const* const salt = ssha1 + brace_and_hash_len;
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size_t const salt_len = source_len - brace_and_hash_len;
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uint8_t buf[SHA_DIGEST_LENGTH * 2 + 1];
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/* hash pass + salt */
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tr_sha1(buf, plain_text, (int)strlen(plain_text), salt, (int)salt_len, NULL);
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tr_sha1_to_hex((char*)buf, buf);
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return strncmp(ssha1 + brace_len, (char const*)buf, SHA_DIGEST_LENGTH * 2) == 0;
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}
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/***
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****
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***/
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void* tr_base64_encode(void const* input, size_t input_length, size_t* output_length)
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{
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char* ret;
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if (input != NULL)
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{
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if (input_length != 0)
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{
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size_t ret_length = 4 * ((input_length + 2) / 3);
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base64_encodestate state;
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#ifdef USE_SYSTEM_B64
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/* Additional space is needed for newlines if we're using unpatched libb64 */
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ret_length += ret_length / 72 + 1;
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#endif
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ret = tr_new(char, ret_length + 8);
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base64_init_encodestate(&state);
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ret_length = base64_encode_block(input, input_length, ret, &state);
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ret_length += base64_encode_blockend(ret + ret_length, &state);
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if (output_length != NULL)
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{
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*output_length = ret_length;
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}
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ret[ret_length] = '\0';
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return ret;
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}
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else
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{
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ret = tr_strdup("");
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}
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}
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else
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{
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ret = NULL;
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}
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if (output_length != NULL)
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{
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*output_length = 0;
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}
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return ret;
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}
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void* tr_base64_encode_str(char const* input, size_t* output_length)
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{
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return tr_base64_encode(input, input == NULL ? 0 : strlen(input), output_length);
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}
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void* tr_base64_decode(void const* input, size_t input_length, size_t* output_length)
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{
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char* ret;
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if (input != NULL)
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{
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if (input_length != 0)
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{
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size_t ret_length = input_length / 4 * 3;
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base64_decodestate state;
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ret = tr_new(char, ret_length + 8);
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base64_init_decodestate(&state);
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ret_length = base64_decode_block(input, input_length, ret, &state);
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if (output_length != NULL)
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{
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*output_length = ret_length;
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}
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ret[ret_length] = '\0';
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return ret;
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}
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else
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{
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ret = tr_strdup("");
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}
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}
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else
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{
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ret = NULL;
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}
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if (output_length != NULL)
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{
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*output_length = 0;
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}
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return ret;
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}
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void* tr_base64_decode_str(char const* input, size_t* output_length)
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{
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return tr_base64_decode(input, input == NULL ? 0 : strlen(input), output_length);
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}
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