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#include "os.h"
#include <libsec.h>
extern void _sha256block(SHA256state*, uchar*);
extern void _sha512block(SHA512state*, uchar*);
u32int sha224h0[] = {
0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4,
};
u32int sha256h0[] = {
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19,
};
u64int sha384h0[] = {
0xcbbb9d5dc1059ed8ULL, 0x629a292a367cd507ULL, 0x9159015a3070dd17ULL, 0x152fecd8f70e5939ULL,
0x67332667ffc00b31ULL, 0x8eb44a8768581511ULL, 0xdb0c2e0d64f98fa7ULL, 0x47b5481dbefa4fa4ULL,
};
u64int sha512h0[] = {
0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL, 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL,
};
static SHA256state *
sha256init(void)
{
SHA256state *s;
s = malloc(sizeof(*s));
if(s == nil)
return nil;
s->malloced = 1;
s->seeded = 0;
s->len = 0;
s->blen = 0;
return s;
}
static void
p32(u32int v, uchar *p)
{
p[0] = v>>24;
p[1] = v>>16;
p[2] = v>>8;
p[3] = v>>0;
}
static void
p64(u64int v, uchar *p)
{
p32(v>>32, p);
p32(v, p+4);
}
enum {
HI = 0,
LO = 1,
};
static void
p128(u64int v[2], uchar *p)
{
p64(v[HI], p);
p64(v[LO], p+8);
}
static void
uvvadd(u64int v[2], int n)
{
v[LO] += n;
if(v[LO] < n) /* overflow */
v[HI]++;
}
static void
uvvmult8(u64int v[2])
{
v[HI] = (v[HI]<<3) | (v[LO] >> (64-3));
v[LO] <<= 3;
}
static void
_sha256(uchar *p, ulong len, SHA256state *s)
{
u32int take;
/* complete possible partial block from last time */
if(s->blen > 0 && s->blen+len >= SHA256bsize) {
take = SHA256bsize-s->blen;
memmove(s->buf+s->blen, p, take);
p += take;
len -= take;
_sha256block(s, s->buf);
s->len += SHA256bsize;
s->blen = 0;
memset(s->buf, 0, SHA256bsize);
}
/* whole blocks */
while(len >= SHA256bsize) {
_sha256block(s, p);
s->len += SHA256bsize;
p += SHA256bsize;
len -= SHA256bsize;
}
/* keep possible leftover bytes */
if(len > 0) {
memmove(s->buf+s->blen, p, len);
s->blen += len;
}
}
static void
sha256finish(SHA256state *s, uchar *digest, int smaller)
{
int i;
uchar end[SHA256bsize+8];
u32int nzero, nb, nd;
nzero = (2*SHA256bsize - s->blen - 1 - 8) % SHA256bsize;
end[0] = 0x80;
memset(end+1, 0, nzero);
nb = 8*(s->len+s->blen);
p64(nb, end+1+nzero);
_sha256(end, 1+nzero+8, s);
nd = SHA256dlen/4;
if(smaller)
nd = SHA224dlen/4;
for(i = 0; i < nd; i++, digest += 4)
p32(s->h32[i], digest);
}
static SHA256state*
sha256x(uchar *p, ulong len, uchar *digest, SHA256state *s, int smaller)
{
if(s == nil) {
s = sha256init();
if(s == nil)
return nil;
}
if(s->seeded == 0){
memmove(s->h32, smaller? sha224h0: sha256h0, sizeof s->h32);
s->seeded = 1;
}
_sha256(p, len, s);
if(digest == 0)
return s;
sha256finish(s, digest, smaller);
if(s->malloced == 1)
free(s);
return nil;
}
SHA256state*
sha224(uchar *p, ulong len, uchar *digest, SHA256state *s)
{
return sha256x(p, len, digest, s, 1);
}
SHA256state*
sha256(uchar *p, ulong len, uchar *digest, SHA256state *s)
{
return sha256x(p, len, digest, s, 0);
}
static SHA512state *
sha512init(void)
{
SHA512state *s;
s = malloc(sizeof(*s));
if(s == nil)
return nil;
s->malloced = 1;
s->seeded = 0;
s->nb128[HI] = 0;
s->nb128[LO] = 0;
s->blen = 0;
return s;
}
static void
_sha512(uchar *p, ulong len, SHA512state *s)
{
u32int take;
/* complete possible partial block from last time */
if(s->blen > 0 && s->blen+len >= SHA512bsize) {
take = SHA512bsize-s->blen;
memmove(s->buf+s->blen, p, take);
p += take;
len -= take;
_sha512block(s, s->buf);
uvvadd(s->nb128, SHA512bsize);
s->blen = 0;
memset(s->buf, 0, SHA512bsize);
}
/* whole blocks */
while(len >= SHA512bsize) {
_sha512block(s, p);
uvvadd(s->nb128, SHA512bsize);
p += SHA512bsize;
len -= SHA512bsize;
}
/* keep possible leftover bytes */
if(len > 0) {
memmove(s->buf+s->blen, p, len);
s->blen += len;
}
}
void
sha512finish(SHA512state *s, uchar *digest, int smaller)
{
int i;
uchar end[SHA512bsize+16];
u32int nzero, n;
u64int nb[2];
nzero = (2*SHA512bsize - s->blen - 1 - 16) % SHA512bsize;
end[0] = 0x80;
memset(end+1, 0, nzero);
nb[0] = s->nb128[0];
nb[1] = s->nb128[1];
uvvadd(nb, s->blen);
uvvmult8(nb);
p128(nb, end+1+nzero);
_sha512(end, 1+nzero+16, s);
n = SHA512dlen/8;
if(smaller)
n = SHA384dlen/8;
for(i = 0; i < n; i++, digest += 8)
p64(s->h64[i], digest);
}
static SHA512state*
sha512x(uchar *p, ulong len, uchar *digest, SHA512state *s, int smaller)
{
if(s == nil) {
s = sha512init();
if(s == nil)
return nil;
}
if(s->seeded == 0){
memmove(s->h64, smaller? sha384h0: sha512h0, sizeof s->h64);
s->seeded = 1;
}
_sha512(p, len, s);
if(digest == 0)
return s;
sha512finish(s, digest, smaller);
if(s->malloced == 1)
free(s);
return nil;
}
SHA512state*
sha384(uchar *p, ulong len, uchar *digest, SHA512state *s)
{
return sha512x(p, len, digest, s, 1);
}
SHA512state*
sha512(uchar *p, ulong len, uchar *digest, SHA512state *s)
{
return sha512x(p, len, digest, s, 0);
}
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