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git-svn-id: svn://svn.code.sf.net/p/axtls/code/trunk@78 9a5d90b5-6617-0410-8a86-bb477d3ed2e3
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cameronrich
2007-03-14 12:03:51 +00:00
parent 974cf12924
commit 73dfbb7568
177 changed files with 46362 additions and 0 deletions
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ssl/crypto_misc.c Normal file
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/*
* Copyright(C) 2006 Cameron Rich
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* Some misc. routines to help things out
*/
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include "crypto.h"
#ifdef CONFIG_WIN32_USE_CRYPTO_LIB
#include "wincrypt.h"
#endif
#ifndef WIN32
static int rng_fd = -1;
#elif defined(CONFIG_WIN32_USE_CRYPTO_LIB)
static HCRYPTPROV gCryptProv;
#endif
#if (!defined(CONFIG_USE_DEV_URANDOM) && !defined(CONFIG_WIN32_USE_CRYPTO_LIB))
static uint64_t rng_num;
#endif
static int rng_ref_count;
const char * const unsupported_str = "Error: feature not supported\n";
#ifndef CONFIG_SSL_SKELETON_MODE
/**
* Retrieve a file and put it into memory
* @return The size of the file, or -1 on failure.
*/
int get_file(const char *filename, uint8_t **buf)
{
int total_bytes = 0;
int bytes_read = 0;
int filesize;
FILE *stream = fopen(filename, "rb");
if (stream == NULL)
{
#ifdef CONFIG_SSL_FULL_MODE
printf("file '%s' does not exist\n", filename); TTY_FLUSH();
#endif
return -1;
}
/* Win CE doesn't support stat() */
fseek(stream, 0, SEEK_END);
filesize = ftell(stream);
*buf = (uint8_t *)malloc(filesize);
fseek(stream, 0, SEEK_SET);
do
{
bytes_read = fread(*buf+total_bytes, 1, filesize-total_bytes, stream);
total_bytes += bytes_read;
} while (total_bytes < filesize && bytes_read > 0);
fclose(stream);
return filesize;
}
#endif
/**
* Initialise the Random Number Generator engine.
* - On Win32 use the platform SDK's crypto engine.
* - On Linux use /dev/urandom
* - If none of these work then use a custom RNG.
*/
EXP_FUNC void STDCALL RNG_initialize(const uint8_t *seed_buf, int size)
{
if (rng_ref_count == 0)
{
#if !defined(WIN32) && defined(CONFIG_USE_DEV_URANDOM)
rng_fd = ax_open("/dev/urandom", O_RDONLY);
#elif defined(WIN32) && defined(CONFIG_WIN32_USE_CRYPTO_LIB)
if (!CryptAcquireContext(&gCryptProv,
NULL, NULL, PROV_RSA_FULL, 0))
{
if (GetLastError() == NTE_BAD_KEYSET &&
!CryptAcquireContext(&gCryptProv,
NULL,
NULL,
PROV_RSA_FULL,
CRYPT_NEWKEYSET))
{
printf("CryptoLib: %x\n", unsupported_str, GetLastError());
exit(1);
}
}
#else
/* help seed with the user's private key - this is a number that
should be hard to find, due to the fact that it relies on knowing
the private key */
int i;
for (i = 0; i < size/(int)sizeof(uint64_t); i++)
rng_num ^= *((uint64_t *)&seed_buf[i*sizeof(uint64_t)]);
srand((long)seed_buf); /* use the stack ptr as another rnd seed */
#endif
}
rng_ref_count++;
}
/**
* Terminate the RNG engine.
*/
EXP_FUNC void STDCALL RNG_terminate(void)
{
if (--rng_ref_count == 0)
{
#ifndef WIN32
close(rng_fd);
#elif defined(CONFIG_WIN32_USE_CRYPTO_LIB)
CryptReleaseContext(gCryptProv, 0);
#endif
}
}
/**
* Set a series of bytes with a random number. Individual bytes can be 0
*/
EXP_FUNC void STDCALL get_random(int num_rand_bytes, uint8_t *rand_data)
{
#if !defined(WIN32) && defined(CONFIG_USE_DEV_URANDOM)
/* use the Linux default */
read(rng_fd, rand_data, num_rand_bytes); /* read from /dev/urandom */
#elif defined(WIN32) && defined(CONFIG_WIN32_USE_CRYPTO_LIB)
/* use Microsoft Crypto Libraries */
CryptGenRandom(gCryptProv, num_rand_bytes, rand_data);
#else /* nothing else to use, so use a custom RNG */
/* The method we use when we've got nothing better. Use RC4, time
and a couple of random seeds to generate a random sequence */
RC4_CTX rng_ctx;
struct timeval tv;
uint64_t big_num1, big_num2;
gettimeofday(&tv, NULL); /* yes I know we shouldn't do this */
/* all numbers by themselves are pretty simple, but combined should
* be a challenge */
big_num1 = (uint64_t)tv.tv_sec*(tv.tv_usec+1);
big_num2 = (uint64_t)rand()*big_num1;
big_num1 ^= rng_num;
memcpy(rand_data, &big_num1, sizeof(uint64_t));
if (num_rand_bytes > sizeof(uint64_t))
memcpy(&rand_data[8], &big_num2, sizeof(uint64_t));
if (num_rand_bytes > 16)
{
/* clear rest of data */
memset(&rand_data[16], 0, num_rand_bytes-16);
}
RC4_setup(&rng_ctx, rand_data, 16); /* use as a key */
RC4_crypt(&rng_ctx, rand_data, rand_data, num_rand_bytes);
/* use last 8 bytes for next time */
memcpy(&rng_num, &rand_data[num_rand_bytes-8], sizeof(uint64_t));
#endif
}
/**
* Set a series of bytes with a random number. Individual bytes are not zero.
*/
void get_random_NZ(int num_rand_bytes, uint8_t *rand_data)
{
int i;
get_random(num_rand_bytes, rand_data);
for (i = 0; i < num_rand_bytes; i++)
{
while (rand_data[i] == 0) /* can't be 0 */
rand_data[i] = (uint8_t)(rand());
}
}
/**
* Some useful diagnostic routines
*/
#if defined(CONFIG_SSL_FULL_MODE) || defined(CONFIG_DEBUG)
int hex_finish;
int hex_index;
static void print_hex_init(int finish)
{
hex_finish = finish;
hex_index = 0;
}
static void print_hex(uint8_t hex)
{
static int column;
if (hex_index == 0)
{
column = 0;
}
printf("%02x ", hex);
if (++column == 8)
{
printf(": ");
}
else if (column >= 16)
{
printf("\n");
column = 0;
}
if (++hex_index >= hex_finish && column > 0)
{
printf("\n");
}
}
/**
* Spit out a blob of data for diagnostics. The data is is a nice column format
* for easy reading.
*
* @param format [in] The string (with possible embedded format characters)
* @param size [in] The number of numbers to print
* @param data [in] The start of data to use
* @param ... [in] Any additional arguments
*/
EXP_FUNC void STDCALL print_blob(const char *format,
const uint8_t *data, int size, ...)
{
int i;
char tmp[80];
va_list(ap);
va_start(ap, size);
sprintf(tmp, "%s\n", format);
vprintf(tmp, ap);
print_hex_init(size);
for (i = 0; i < size; i++)
{
print_hex(data[i]);
}
va_end(ap);
TTY_FLUSH();
}
#elif defined(WIN32)
/* VC6.0 doesn't handle variadic macros */
EXP_FUNC void STDCALL print_blob(const char *format, const unsigned char *data,
int size, ...) {}
#endif
#if defined(CONFIG_SSL_HAS_PEM) || defined(CONFIG_HTTP_HAS_AUTHORIZATION)
/* base64 to binary lookup table */
static const uint8_t map[128] =
{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 255, 255, 255, 255, 255
};
EXP_FUNC int STDCALL base64_decode(const char *in, int len,
uint8_t *out, int *outlen)
{
int g, t, x, y, z;
uint8_t c;
int ret = -1;
g = 3;
for (x = y = z = t = 0; x < len; x++)
{
if ((c = map[in[x]&0x7F]) == 0xff)
continue;
if (c == 254) /* this is the end... */
{
c = 0;
if (--g < 0)
goto error;
}
else if (g != 3) /* only allow = at end */
goto error;
t = (t<<6) | c;
if (++y == 4)
{
out[z++] = (uint8_t)((t>>16)&255);
if (g > 1)
out[z++] = (uint8_t)((t>>8)&255);
if (g > 2)
out[z++] = (uint8_t)(t&255);
y = t = 0;
}
}
if (y != 0)
goto error;
if (outlen)
*outlen = z;
ret = 0;
error:
#ifdef CONFIG_SSL_FULL_MODE
if (ret < 0)
printf("Error: Invalid base64\n"); TTY_FLUSH();
#endif
TTY_FLUSH();
return ret;
}
#endif