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#include "rsa_common.h"
void fail(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputs("\n", stderr);
fflush(stderr);
exit(1);
}
void write_file(const char *fname, const void *buf, const unsigned long len)
{
FILE *io = fopen(fname, "wb");
if (!io) {
fail("Can't open '%s' for writing: %s", fname, strerror(errno));
}
if (fwrite(buf, len, 1, io) != 1) {
fail("Couldn't write '%s': %s", fname, strerror(errno));
}
if (fclose(io) != 0) {
fail("Couldn't flush '%s' to disk: %s", fname, strerror(errno));
}
}
void read_file(const char *fname, void *buf, unsigned long *len)
{
ssize_t br;
FILE *io = fopen(fname, "rb");
if (!io) {
fail("Can't open '%s' for reading: %s", fname, strerror(errno));
}
br = fread(buf, 1, *len, io);
if (ferror(io)) {
fail("Couldn't read '%s': %s", fname, strerror(errno));
} else if (!feof(io)) {
fail("Buffer too small to read '%s'", fname);
}
fclose(io);
*len = (unsigned long) br;
}
void read_rsakey(rsa_key *key, const char *fname)
{
unsigned char buf[4096];
unsigned long len = sizeof (buf);
int rc;
read_file(fname, buf, &len);
if ((rc = rsa_import(buf, len, key)) != CRYPT_OK) {
fail("rsa_import for '%s' failed: %s", fname, error_to_string(rc));
}
}
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