static int
descipher(Espcb *ecb, uchar *p, int n)
{
uchar tmp[8];
uchar *pp, *tp, *ip, *eip, *ep;
DESstate *ds = ecb->espstate;
ep = p + n;
if(ecb->incoming) {
memmove(ds->ivec, p, 8);
p += 8;
while(p < ep){
memmove(tmp, p, 8);
block_cipher(ds->expanded, p, 1);
tp = tmp;
ip = ds->ivec;
for(eip = ip+8; ip < eip; ){
*p++ ^= *ip;
*ip++ = *tp++;
}
}
} else {
memmove(p, ds->ivec, 8);
for(p += 8; p < ep; p += 8){
pp = p;
ip = ds->ivec;
for(eip = ip+8; ip < eip; )
*pp++ ^= *ip++;
block_cipher(ds->expanded, p, 0);
memmove(ds->ivec, p, 8);
}
}
return 1;
}
void
desencrypt(uchar data[8], uchar key[7])
{
ulong ekey[32];
key_setup(key, ekey);
block_cipher(ekey, data, 0);
}
void
desECBdecrypt(uint8_t *p, int len, DESstate *s)
{
int i;
uint8_t tmp[8];
for(; len >= 8; len -= 8){
block_cipher(s->expanded, p, 1);
p += 8;
}
if(len > 0){
for (i=0; i<8; i++)
tmp[i] = i;
block_cipher(s->expanded, tmp, 0);
for (i = 0; i < len; i++)
p[i] ^= tmp[i];
}
}
/*
* destructively encrypt the buffer, which
* must be at least 8 characters long.
*/
int
encrypt(void *key, void *vbuf, int n)
{
ulong ekey[32];
uchar *buf;
int i, r;
if(n < 8)
return 0;
key_setup(key, ekey);
buf = vbuf;
n--;
r = n % 7;
n /= 7;
for(i = 0; i < n; i++) {
block_cipher(ekey, buf, 0);
buf += 7;
}
if(r)
block_cipher(ekey, buf - 7 + r, 0);
return 1;
}
/*
* destructively decrypt the buffer, which
* must be at least 8 characters long.
*/
int
decrypt(void *key, void *vbuf, int n)
{
ulong ekey[128];
uchar *buf;
int i, r;
if(n < 8)
return 0;
key_setup(key, ekey);
buf = vbuf;
n--;
r = n % 7;
n /= 7;
buf += n * 7;
if(r)
block_cipher(ekey, buf - 7 + r, 1);
for(i = 0; i < n; i++) {
buf -= 7;
block_cipher(ekey, buf, 1);
}
return 1;
}
std::map<std::string, double>
algorithm_benchmark(const std::string& name,
u32bit milliseconds,
Timer& timer,
RandomNumberGenerator& rng,
Algorithm_Factory& af)
{
std::vector<std::string> providers = af.providers_of(name);
std::map<std::string, double> all_results;
if(providers.empty()) // no providers, nothing to do
return all_results;
const u64bit ns_per_provider =
((u64bit)milliseconds * 1000 * 1000) / providers.size();
std::vector<byte> buf(16 * 1024);
rng.randomize(&buf[0], buf.size());
for(u32bit i = 0; i != providers.size(); ++i)
{
const std::string provider = providers[i];
std::pair<u64bit, u64bit> results(0, 0);
if(const BlockCipher* proto =
af.prototype_block_cipher(name, provider))
{
std::auto_ptr<BlockCipher> block_cipher(proto->clone());
results = bench_block_cipher(block_cipher.get(), timer,
ns_per_provider,
&buf[0], buf.size());
}
else if(const StreamCipher* proto =
af.prototype_stream_cipher(name, provider))
{
std::auto_ptr<StreamCipher> stream_cipher(proto->clone());
results = bench_stream_cipher(stream_cipher.get(), timer,
ns_per_provider,
&buf[0], buf.size());
}
else if(const HashFunction* proto =
af.prototype_hash_function(name, provider))
{
std::auto_ptr<HashFunction> hash(proto->clone());
results = bench_hash(hash.get(), timer, ns_per_provider,
&buf[0], buf.size());
}
else if(const MessageAuthenticationCode* proto =
af.prototype_mac(name, provider))
{
std::auto_ptr<MessageAuthenticationCode> mac(proto->clone());
results = bench_mac(mac.get(), timer, ns_per_provider,
&buf[0], buf.size());
}
if(results.first && results.second)
{
/* 953.67 == 1000 * 1000 * 1000 / 1024 / 1024 - the conversion
factor from bytes per nanosecond to mebibytes per second.
*/
double speed = (953.67 * results.first) / results.second;
all_results[provider] = speed;
}
}
return all_results;
}
