diff options
Diffstat (limited to 'bufaux.c')
| -rw-r--r-- | bufaux.c | 53 |
1 files changed, 52 insertions, 1 deletions
@@ -12,10 +12,12 @@ * Auxiliary functions for storing and retrieving various data types to/from * Buffers. * + * SSH2 packet format added by Markus Friedl + * */ #include "includes.h" -RCSID("$Id: bufaux.c,v 1.8 2000/03/17 12:40:15 damien Exp $"); +RCSID("$Id: bufaux.c,v 1.9 2000/04/01 01:09:23 damien Exp $"); #include "ssh.h" @@ -83,6 +85,50 @@ buffer_get_bignum(Buffer *buffer, BIGNUM *value) } /* + * Stores an BIGNUM in the buffer in SSH2 format. + */ +void +buffer_put_bignum2(Buffer *buffer, BIGNUM *value) +{ + int bytes = BN_num_bytes(value) + 1; + unsigned char *buf = xmalloc(bytes); + int oi; + int hasnohigh = 0; + buf[0] = '\0'; + /* Get the value of in binary */ + oi = BN_bn2bin(value, buf+1); + if (oi != bytes-1) + fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d", + oi, bytes); + hasnohigh = (buf[1] & 0x80) ? 0 : 1; + if (value->neg) { + /**XXX should be two's-complement */ + int i, carry; + unsigned char *uc = buf; + log("negativ!"); + for(i = bytes-1, carry = 1; i>=0; i--) { + uc[i] ^= 0xff; + if(carry) + carry = !++uc[i]; + } + } + buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); + memset(buf, 0, bytes); + xfree(buf); +} + +int +buffer_get_bignum2(Buffer *buffer, BIGNUM *value) +{ + /**XXX should be two's-complement */ + int len; + unsigned char *bin = (unsigned char *)buffer_get_string(buffer, (unsigned int *)&len); + BN_bin2bn(bin, len, value); + xfree(bin); + return len; +} + +/* * Returns an integer from the buffer (4 bytes, msb first). */ unsigned int @@ -142,6 +188,11 @@ buffer_put_string(Buffer *buffer, const void *buf, unsigned int len) buffer_put_int(buffer, len); buffer_append(buffer, buf, len); } +void +buffer_put_cstring(Buffer *buffer, const char *s) +{ + buffer_put_string(buffer, s, strlen(s)); +} /* * Returns a character from the buffer (0 - 255). |