version 1.28.2.1, 2003/09/16 20:50:42 |
version 1.28.2.2, 2004/03/04 18:18:15 |
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* by (bits+7)/8 bytes of binary data, msb first. |
* by (bits+7)/8 bytes of binary data, msb first. |
*/ |
*/ |
void |
void |
buffer_put_bignum(Buffer *buffer, BIGNUM *value) |
buffer_put_bignum(Buffer *buffer, const BIGNUM *value) |
{ |
{ |
int bits = BN_num_bits(value); |
int bits = BN_num_bits(value); |
int bin_size = (bits + 7) / 8; |
int bin_size = (bits + 7) / 8; |
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void |
void |
buffer_get_bignum(Buffer *buffer, BIGNUM *value) |
buffer_get_bignum(Buffer *buffer, BIGNUM *value) |
{ |
{ |
int bits, bytes; |
u_int bits, bytes; |
u_char buf[2], *bin; |
u_char buf[2], *bin; |
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/* Get the number for bits. */ |
/* Get the number for bits. */ |
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* Stores an BIGNUM in the buffer in SSH2 format. |
* Stores an BIGNUM in the buffer in SSH2 format. |
*/ |
*/ |
void |
void |
buffer_put_bignum2(Buffer *buffer, BIGNUM *value) |
buffer_put_bignum2(Buffer *buffer, const BIGNUM *value) |
{ |
{ |
int bytes = BN_num_bytes(value) + 1; |
u_int bytes; |
u_char *buf = xmalloc(bytes); |
u_char *buf; |
int oi; |
int oi; |
int hasnohigh = 0; |
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; |
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} |
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if (value->neg) |
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fatal("buffer_put_bignum2: negative numbers not supported"); |
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bytes = BN_num_bytes(value) + 1; /* extra padding byte */ |
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if (bytes < 2) |
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fatal("buffer_put_bignum2: BN too small"); |
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buf = xmalloc(bytes); |
buf[0] = '\0'; |
buf[0] = '\0'; |
/* Get the value of in binary */ |
/* Get the value of in binary */ |
oi = BN_bn2bin(value, buf+1); |
oi = BN_bn2bin(value, buf+1); |
if (oi != bytes-1) |
if (oi != bytes-1) |
fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d", |
fatal("buffer_put_bignum2: BN_bn2bin() failed: " |
oi, bytes); |
"oi %d != bin_size %d", oi, bytes); |
hasnohigh = (buf[1] & 0x80) ? 0 : 1; |
hasnohigh = (buf[1] & 0x80) ? 0 : 1; |
if (value->neg) { |
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/**XXX should be two's-complement */ |
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int i, carry; |
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u_char *uc = buf; |
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logit("negativ!"); |
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for (i = bytes-1, carry = 1; i>=0; i--) { |
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uc[i] ^= 0xff; |
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if (carry) |
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carry = !++uc[i]; |
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} |
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} |
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buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); |
buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); |
memset(buf, 0, bytes); |
memset(buf, 0, bytes); |
xfree(buf); |
xfree(buf); |
} |
} |
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/* XXX does not handle negative BNs */ |
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void |
void |
buffer_get_bignum2(Buffer *buffer, BIGNUM *value) |
buffer_get_bignum2(Buffer *buffer, BIGNUM *value) |
{ |
{ |
u_int len; |
u_int len; |
u_char *bin = buffer_get_string(buffer, &len); |
u_char *bin = buffer_get_string(buffer, &len); |
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if (len > 0 && (bin[0] & 0x80)) |
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fatal("buffer_get_bignum2: negative numbers not supported"); |
if (len > 8 * 1024) |
if (len > 8 * 1024) |
fatal("buffer_get_bignum2: cannot handle BN of size %d", len); |
fatal("buffer_get_bignum2: cannot handle BN of size %d", len); |
BN_bin2bn(bin, len, value); |
BN_bin2bn(bin, len, value); |
xfree(bin); |
xfree(bin); |
} |
} |
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/* |
/* |
* Returns integers from the buffer (msb first). |
* Returns integers from the buffer (msb first). |
*/ |
*/ |