version 1.37.2.1, 2006/09/30 04:06:50 |
version 1.38, 2006/03/19 18:51:18 |
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/* $OpenBSD$ */ |
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/* |
/* |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
*/ |
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#include <sys/types.h> |
#include "includes.h" |
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#include <openssl/bn.h> |
#include <openssl/bn.h> |
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#include "bufaux.h" |
#include <string.h> |
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#include <stdarg.h> |
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#include "xmalloc.h" |
#include "xmalloc.h" |
#include "buffer.h" |
#include "getput.h" |
#include "log.h" |
#include "log.h" |
#include "misc.h" |
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/* |
/* |
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* Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed |
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* by (bits+7)/8 bytes of binary data, msb first. |
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*/ |
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int |
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buffer_put_bignum_ret(Buffer *buffer, const BIGNUM *value) |
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{ |
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int bits = BN_num_bits(value); |
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int bin_size = (bits + 7) / 8; |
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u_char *buf = xmalloc(bin_size); |
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int oi; |
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char msg[2]; |
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/* Get the value of in binary */ |
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oi = BN_bn2bin(value, buf); |
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if (oi != bin_size) { |
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error("buffer_put_bignum_ret: BN_bn2bin() failed: oi %d != bin_size %d", |
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oi, bin_size); |
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xfree(buf); |
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return (-1); |
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} |
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/* Store the number of bits in the buffer in two bytes, msb first. */ |
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PUT_16BIT(msg, bits); |
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buffer_append(buffer, msg, 2); |
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/* Store the binary data. */ |
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buffer_append(buffer, (char *)buf, oi); |
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memset(buf, 0, bin_size); |
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xfree(buf); |
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return (0); |
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} |
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void |
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buffer_put_bignum(Buffer *buffer, const BIGNUM *value) |
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{ |
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if (buffer_put_bignum_ret(buffer, value) == -1) |
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fatal("buffer_put_bignum: buffer error"); |
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} |
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/* |
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* Retrieves an BIGNUM from the buffer. |
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*/ |
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int |
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buffer_get_bignum_ret(Buffer *buffer, BIGNUM *value) |
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{ |
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u_int bits, bytes; |
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u_char buf[2], *bin; |
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/* Get the number for bits. */ |
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if (buffer_get_ret(buffer, (char *) buf, 2) == -1) { |
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error("buffer_get_bignum_ret: invalid length"); |
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return (-1); |
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} |
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bits = GET_16BIT(buf); |
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/* Compute the number of binary bytes that follow. */ |
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bytes = (bits + 7) / 8; |
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if (bytes > 8 * 1024) { |
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error("buffer_get_bignum_ret: cannot handle BN of size %d", bytes); |
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return (-1); |
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} |
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if (buffer_len(buffer) < bytes) { |
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error("buffer_get_bignum_ret: input buffer too small"); |
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return (-1); |
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} |
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bin = buffer_ptr(buffer); |
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BN_bin2bn(bin, bytes, value); |
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if (buffer_consume_ret(buffer, bytes) == -1) { |
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error("buffer_get_bignum_ret: buffer_consume failed"); |
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return (-1); |
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} |
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return (0); |
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} |
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void |
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buffer_get_bignum(Buffer *buffer, BIGNUM *value) |
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{ |
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if (buffer_get_bignum_ret(buffer, value) == -1) |
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fatal("buffer_get_bignum: buffer error"); |
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} |
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/* |
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* Stores an BIGNUM in the buffer in SSH2 format. |
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*/ |
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int |
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buffer_put_bignum2_ret(Buffer *buffer, const BIGNUM *value) |
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{ |
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u_int bytes; |
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u_char *buf; |
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int oi; |
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u_int hasnohigh = 0; |
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if (BN_is_zero(value)) { |
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buffer_put_int(buffer, 0); |
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return 0; |
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} |
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if (value->neg) { |
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error("buffer_put_bignum2_ret: negative numbers not supported"); |
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return (-1); |
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} |
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bytes = BN_num_bytes(value) + 1; /* extra padding byte */ |
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if (bytes < 2) { |
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error("buffer_put_bignum2_ret: BN too small"); |
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return (-1); |
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} |
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buf = xmalloc(bytes); |
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buf[0] = 0x00; |
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/* Get the value of in binary */ |
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oi = BN_bn2bin(value, buf+1); |
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if (oi < 0 || (u_int)oi != bytes - 1) { |
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error("buffer_put_bignum2_ret: BN_bn2bin() failed: " |
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"oi %d != bin_size %d", oi, bytes); |
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xfree(buf); |
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return (-1); |
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} |
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hasnohigh = (buf[1] & 0x80) ? 0 : 1; |
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buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); |
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memset(buf, 0, bytes); |
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xfree(buf); |
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return (0); |
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} |
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void |
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buffer_put_bignum2(Buffer *buffer, const BIGNUM *value) |
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{ |
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if (buffer_put_bignum2_ret(buffer, value) == -1) |
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fatal("buffer_put_bignum2: buffer error"); |
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} |
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int |
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buffer_get_bignum2_ret(Buffer *buffer, BIGNUM *value) |
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{ |
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u_int len; |
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u_char *bin; |
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if ((bin = buffer_get_string_ret(buffer, &len)) == NULL) { |
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error("buffer_get_bignum2_ret: invalid bignum"); |
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return (-1); |
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} |
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if (len > 0 && (bin[0] & 0x80)) { |
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error("buffer_get_bignum2_ret: negative numbers not supported"); |
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xfree(bin); |
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return (-1); |
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} |
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if (len > 8 * 1024) { |
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error("buffer_get_bignum2_ret: cannot handle BN of size %d", len); |
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xfree(bin); |
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return (-1); |
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} |
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BN_bin2bn(bin, len, value); |
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xfree(bin); |
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return (0); |
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} |
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void |
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buffer_get_bignum2(Buffer *buffer, BIGNUM *value) |
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{ |
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if (buffer_get_bignum2_ret(buffer, value) == -1) |
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fatal("buffer_get_bignum2: buffer error"); |
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} |
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/* |
* Returns integers from the buffer (msb first). |
* Returns integers from the buffer (msb first). |
*/ |
*/ |
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if (buffer_get_ret(buffer, (char *) buf, 2) == -1) |
if (buffer_get_ret(buffer, (char *) buf, 2) == -1) |
return (-1); |
return (-1); |
*ret = get_u16(buf); |
*ret = GET_16BIT(buf); |
return (0); |
return (0); |
} |
} |
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if (buffer_get_ret(buffer, (char *) buf, 4) == -1) |
if (buffer_get_ret(buffer, (char *) buf, 4) == -1) |
return (-1); |
return (-1); |
*ret = get_u32(buf); |
*ret = GET_32BIT(buf); |
return (0); |
return (0); |
} |
} |
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if (buffer_get_ret(buffer, (char *) buf, 8) == -1) |
if (buffer_get_ret(buffer, (char *) buf, 8) == -1) |
return (-1); |
return (-1); |
*ret = get_u64(buf); |
*ret = GET_64BIT(buf); |
return (0); |
return (0); |
} |
} |
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{ |
{ |
char buf[2]; |
char buf[2]; |
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put_u16(buf, value); |
PUT_16BIT(buf, value); |
buffer_append(buffer, buf, 2); |
buffer_append(buffer, buf, 2); |
} |
} |
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{ |
{ |
char buf[4]; |
char buf[4]; |
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put_u32(buf, value); |
PUT_32BIT(buf, value); |
buffer_append(buffer, buf, 4); |
buffer_append(buffer, buf, 4); |
} |
} |
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{ |
{ |
char buf[8]; |
char buf[8]; |
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put_u64(buf, value); |
PUT_64BIT(buf, value); |
buffer_append(buffer, buf, 8); |
buffer_append(buffer, buf, 8); |
} |
} |
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