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pem.c
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pem.c
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/* Copyright (C) 2007 The Written Word, Inc. All rights reserved.
* Author: Simon Josefsson
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include "libssh2_priv.h"
static int readline (char *line, int line_size, FILE *fp)
{
if (!fgets(line, line_size, fp))
{
return -1;
}
if (*line && line[strlen(line) - 1] == '\r')
{
line[strlen(line) - 1] = '\0';
}
if (*line && line[strlen(line) - 1] == '\n')
{
line[strlen(line) - 1] = '\0';
}
return 0;
}
#define LINE_SIZE 128
int _libssh2_pem_parse (LIBSSH2_SESSION *session,
const char *headerbegin,
const char *headerend,
FILE *fp,
char **data, unsigned int *datalen)
{
char line[LINE_SIZE];
char *b64data = NULL;
unsigned int b64datalen = 0;
int ret;
do
{
if (readline(line, LINE_SIZE, fp))
{
return -1;
}
}
while (strcmp (line, headerbegin) != 0);
*line = '\0';
do
{
if (*line)
{
char *tmp;
size_t linelen;
linelen = strlen (line);
tmp = LIBSSH2_REALLOC (session, b64data,
b64datalen + linelen);
if (!tmp)
{
ret = -1;
goto out;
}
memcpy (tmp + b64datalen, line, linelen);
b64data = tmp;
b64datalen += linelen;
}
if (readline(line, LINE_SIZE, fp))
{
ret = -1;
goto out;
}
} while (strcmp (line, headerend) != 0);
if (libssh2_base64_decode(session, data, datalen,
b64data, b64datalen))
{
ret = -1;
goto out;
}
ret = 0;
out:
if (b64data) {
LIBSSH2_FREE (session, b64data);
}
return ret;
}
static int read_asn1_length (const unsigned char *data,
unsigned int datalen,
unsigned int *len)
{
unsigned int lenlen;
int nextpos;
if (datalen < 1)
{
return -1;
}
*len = data[0];
if (*len >= 0x80)
{
lenlen = *len & 0x7F;
*len = data[1];
if (1 + lenlen > datalen)
{
return -1;
}
if (lenlen > 1)
{
*len <<= 8;
*len |= data[2];
}
}
else
{
lenlen = 0;
}
nextpos = 1 + lenlen;
if (lenlen > 2 || 1 + lenlen + *len > datalen)
{
return -1;
}
return nextpos;
}
int _libssh2_pem_decode_sequence (unsigned char **data, unsigned int *datalen)
{
unsigned int len;
int lenlen;
if (*datalen < 1)
{
return -1;
}
if ((*data)[0] != '\x30')
{
return -1;
}
(*data)++;
(*datalen)--;
lenlen = read_asn1_length (*data, *datalen, &len);
if (lenlen < 0 || lenlen + len != *datalen)
{
return -1;
}
*data += lenlen;
*datalen -= lenlen;
return 0;
}
int _libssh2_pem_decode_integer (unsigned char **data, unsigned int *datalen,
unsigned char **i, unsigned int *ilen)
{
unsigned int len;
int lenlen;
if (*datalen < 1)
{
return -1;
}
if ((*data)[0] != '\x02')
{
return -1;
}
(*data)++;
(*datalen)--;
lenlen = read_asn1_length (*data, *datalen, &len);
if (lenlen < 0 || lenlen + len > *datalen)
{
return -1;
}
*data += lenlen;
*datalen -= lenlen;
*i = *data;
*ilen = len;
*data += len;
*datalen -= len;
return 0;
}