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*/ |
*/ |
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#include "rdesktop.h" |
#include "rdesktop.h" |
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#ifdef WITH_OPENSSL |
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#include <openssl/rc4.h> |
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#include <openssl/md5.h> |
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#include <openssl/sha.h> |
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#include <openssl/bn.h> |
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#else |
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#include "crypto/rc4.h" |
#include "crypto/rc4.h" |
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#include "crypto/md5.h" |
#include "crypto/md5.h" |
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#include "crypto/sha.h" |
#include "crypto/sha.h" |
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#include "crypto/arith.h" |
#include "crypto/bn.h" |
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#endif |
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extern char hostname[16]; |
extern char hostname[16]; |
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extern int width; |
extern int width; |
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use_count++; |
use_count++; |
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} |
} |
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/* Read in a NUMBER from a buffer */ |
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static void |
static void |
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sec_read_number(NUMBER * num, uint8 *buffer, int len) |
reverse(uint8 *p, int len) |
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{ |
{ |
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INT *data = num->n_part; |
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int i, j; |
int i, j; |
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uint8 temp; |
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for (i = 0, j = 0; j < len; i++, j += 2) |
for (i = 0, j = len-1; i < j; i++, j--) |
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data[i] = buffer[j] | (buffer[j + 1] << 8); |
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num->n_len = i; |
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} |
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/* Write a NUMBER to a buffer */ |
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static void |
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sec_write_number(NUMBER * num, uint8 *buffer, int len) |
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{ |
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INT *data = num->n_part; |
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int i, j; |
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for (i = 0, j = 0; j < len; i++, j += 2) |
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{ |
{ |
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buffer[j] = data[i] & 0xff; |
temp = p[i]; |
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buffer[j + 1] = data[i] >> 8; |
p[i] = p[j]; |
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p[j] = temp; |
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} |
} |
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} |
} |
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sec_rsa_encrypt(uint8 *out, uint8 *in, int len, |
sec_rsa_encrypt(uint8 *out, uint8 *in, int len, |
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uint8 *modulus, uint8 *exponent) |
uint8 *modulus, uint8 *exponent) |
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{ |
{ |
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NUMBER data, key; |
BN_CTX ctx; |
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BIGNUM mod, exp, x, y; |
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/* Set modulus for arithmetic */ |
uint8 inr[SEC_MODULUS_SIZE]; |
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sec_read_number(&key, modulus, SEC_MODULUS_SIZE); |
int outlen; |
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m_init(&key, NULL); |
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reverse(modulus, SEC_MODULUS_SIZE); |
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/* Exponentiate */ |
reverse(exponent, SEC_EXPONENT_SIZE); |
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sec_read_number(&data, in, len); |
memcpy(inr, in, len); |
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sec_read_number(&key, exponent, SEC_EXPONENT_SIZE); |
reverse(inr, len); |
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m_exp(&data, &key, &data); |
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sec_write_number(&data, out, SEC_MODULUS_SIZE); |
BN_CTX_init(&ctx); |
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BN_init(&mod); |
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BN_init(&exp); |
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BN_init(&x); |
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BN_init(&y); |
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BN_bin2bn(modulus, SEC_MODULUS_SIZE, &mod); |
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BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp); |
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BN_bin2bn(inr, len, &x); |
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BN_mod_exp(&y, &x, &exp, &mod, &ctx); |
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outlen = BN_bn2bin(&y, out); |
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reverse(out, outlen); |
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if (outlen < SEC_MODULUS_SIZE) |
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memset(out+outlen, 0, SEC_MODULUS_SIZE-outlen); |
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BN_free(&y); |
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BN_clear_free(&x); |
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BN_free(&exp); |
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BN_free(&mod); |
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BN_CTX_free(&ctx); |
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} |
} |
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/* Initialise secure transport packet */ |
/* Initialise secure transport packet */ |