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- Better buffer handling in mpi_read_file()

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This commit is contained in:
Paul Bakker
2011-11-30 16:00:20 +00:00
parent 23fd5ea667
commit cb37aa5912
4 changed files with 28 additions and 7 deletions
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8
library/bignum.c
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@ -441,15 +441,19 @@ int mpi_read_file( mpi *X, int radix, FILE *fin )
size_t slen;
char *p;
/*
* Buffer should have space for (short) label and hexified MPI and '\0'
* Buffer should have space for (short) label and decimal formatted MPI,
* newline characters and '\0'
*/
char s[ 2 * POLARSSL_MPI_MAX_SIZE + 10 ];
char s[ POLARSSL_MPI_READ_BUFFER_SIZE ];
memset( s, 0, sizeof( s ) );
if( fgets( s, sizeof( s ) - 1, fin ) == NULL )
return( POLARSSL_ERR_MPI_FILE_IO_ERROR );
slen = strlen( s );
if( slen == sizeof( s ) - 2 )
return( POLARSSL_ERR_MPI_BUFFER_TOO_SMALL );
if( s[slen - 1] == '\n' ) { slen--; s[slen] = '\0'; }
if( s[slen - 1] == '\r' ) { slen--; s[slen] = '\0'; }