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sshsh512.c
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sshsh512.c
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/*
* SHA-512 algorithm as described at
*
* http://csrc.nist.gov/cryptval/shs.html
*
* Modifications made for SHA-384 also
*/
#include <assert.h>
#include "ssh.h"
#define BLKSIZE 128
typedef struct {
uint64_t h[8];
unsigned char block[BLKSIZE];
int blkused;
uint64_t lenhi, lenlo;
BinarySink_IMPLEMENTATION;
} SHA512_State;
/*
* Arithmetic implementations. Note that AND, XOR and NOT can
* overlap destination with one source, but the others can't.
*/
#define add(r,x,y) ( r = (x) + (y) )
#define rorB(r,x,y) ( r = ((x) >> (y)) | ((x) << (64-(y))) )
#define rorL(r,x,y) ( r = ((x) >> (y)) | ((x) << (64-(y))) )
#define shrB(r,x,y) ( r = (x) >> (y) )
#define shrL(r,x,y) ( r = (x) >> (y) )
#define and(r,x,y) ( r = (x) & (y) )
#define xor(r,x,y) ( r = (x) ^ (y) )
#define not(r,x) ( r = ~(x) )
#define INIT(h,l) ((((uint64_t)(h)) << 32) | (l))
#define BUILD(r,h,l) ( r = ((((uint64_t)(h)) << 32) | (l)) )
#define EXTRACT(h,l,r) ( h = (r) >> 32, l = (r) & 0xFFFFFFFFU )
/* ----------------------------------------------------------------------
* Core SHA512 algorithm: processes 16-doubleword blocks into a
* message digest.
*/
#define Ch(r,t,x,y,z) ( not(t,x), and(r,t,z), and(t,x,y), xor(r,r,t) )
#define Maj(r,t,x,y,z) ( and(r,x,y), and(t,x,z), xor(r,r,t), \
and(t,y,z), xor(r,r,t) )
#define bigsigma0(r,t,x) ( rorL(r,x,28), rorB(t,x,34), xor(r,r,t), \
rorB(t,x,39), xor(r,r,t) )
#define bigsigma1(r,t,x) ( rorL(r,x,14), rorL(t,x,18), xor(r,r,t), \
rorB(t,x,41), xor(r,r,t) )
#define smallsigma0(r,t,x) ( rorL(r,x,1), rorL(t,x,8), xor(r,r,t), \
shrL(t,x,7), xor(r,r,t) )
#define smallsigma1(r,t,x) ( rorL(r,x,19), rorB(t,x,61), xor(r,r,t), \
shrL(t,x,6), xor(r,r,t) )
static void SHA512_Core_Init(SHA512_State *s) {
static const uint64_t iv[] = {
INIT(0x6a09e667, 0xf3bcc908),
INIT(0xbb67ae85, 0x84caa73b),
INIT(0x3c6ef372, 0xfe94f82b),
INIT(0xa54ff53a, 0x5f1d36f1),
INIT(0x510e527f, 0xade682d1),
INIT(0x9b05688c, 0x2b3e6c1f),
INIT(0x1f83d9ab, 0xfb41bd6b),
INIT(0x5be0cd19, 0x137e2179),
};
int i;
for (i = 0; i < 8; i++)
s->h[i] = iv[i];
}
static void SHA384_Core_Init(SHA512_State *s) {
static const uint64_t iv[] = {
INIT(0xcbbb9d5d, 0xc1059ed8),
INIT(0x629a292a, 0x367cd507),
INIT(0x9159015a, 0x3070dd17),
INIT(0x152fecd8, 0xf70e5939),
INIT(0x67332667, 0xffc00b31),
INIT(0x8eb44a87, 0x68581511),
INIT(0xdb0c2e0d, 0x64f98fa7),
INIT(0x47b5481d, 0xbefa4fa4),
};
int i;
for (i = 0; i < 8; i++)
s->h[i] = iv[i];
}
static void SHA512_Block(SHA512_State *s, uint64_t *block) {
uint64_t w[80];
uint64_t a,b,c,d,e,f,g,h;
static const uint64_t k[] = {
INIT(0x428a2f98, 0xd728ae22), INIT(0x71374491, 0x23ef65cd),
INIT(0xb5c0fbcf, 0xec4d3b2f), INIT(0xe9b5dba5, 0x8189dbbc),
INIT(0x3956c25b, 0xf348b538), INIT(0x59f111f1, 0xb605d019),
INIT(0x923f82a4, 0xaf194f9b), INIT(0xab1c5ed5, 0xda6d8118),
INIT(0xd807aa98, 0xa3030242), INIT(0x12835b01, 0x45706fbe),
INIT(0x243185be, 0x4ee4b28c), INIT(0x550c7dc3, 0xd5ffb4e2),
INIT(0x72be5d74, 0xf27b896f), INIT(0x80deb1fe, 0x3b1696b1),
INIT(0x9bdc06a7, 0x25c71235), INIT(0xc19bf174, 0xcf692694),
INIT(0xe49b69c1, 0x9ef14ad2), INIT(0xefbe4786, 0x384f25e3),
INIT(0x0fc19dc6, 0x8b8cd5b5), INIT(0x240ca1cc, 0x77ac9c65),
INIT(0x2de92c6f, 0x592b0275), INIT(0x4a7484aa, 0x6ea6e483),
INIT(0x5cb0a9dc, 0xbd41fbd4), INIT(0x76f988da, 0x831153b5),
INIT(0x983e5152, 0xee66dfab), INIT(0xa831c66d, 0x2db43210),
INIT(0xb00327c8, 0x98fb213f), INIT(0xbf597fc7, 0xbeef0ee4),
INIT(0xc6e00bf3, 0x3da88fc2), INIT(0xd5a79147, 0x930aa725),
INIT(0x06ca6351, 0xe003826f), INIT(0x14292967, 0x0a0e6e70),
INIT(0x27b70a85, 0x46d22ffc), INIT(0x2e1b2138, 0x5c26c926),
INIT(0x4d2c6dfc, 0x5ac42aed), INIT(0x53380d13, 0x9d95b3df),
INIT(0x650a7354, 0x8baf63de), INIT(0x766a0abb, 0x3c77b2a8),
INIT(0x81c2c92e, 0x47edaee6), INIT(0x92722c85, 0x1482353b),
INIT(0xa2bfe8a1, 0x4cf10364), INIT(0xa81a664b, 0xbc423001),
INIT(0xc24b8b70, 0xd0f89791), INIT(0xc76c51a3, 0x0654be30),
INIT(0xd192e819, 0xd6ef5218), INIT(0xd6990624, 0x5565a910),
INIT(0xf40e3585, 0x5771202a), INIT(0x106aa070, 0x32bbd1b8),
INIT(0x19a4c116, 0xb8d2d0c8), INIT(0x1e376c08, 0x5141ab53),
INIT(0x2748774c, 0xdf8eeb99), INIT(0x34b0bcb5, 0xe19b48a8),
INIT(0x391c0cb3, 0xc5c95a63), INIT(0x4ed8aa4a, 0xe3418acb),
INIT(0x5b9cca4f, 0x7763e373), INIT(0x682e6ff3, 0xd6b2b8a3),
INIT(0x748f82ee, 0x5defb2fc), INIT(0x78a5636f, 0x43172f60),
INIT(0x84c87814, 0xa1f0ab72), INIT(0x8cc70208, 0x1a6439ec),
INIT(0x90befffa, 0x23631e28), INIT(0xa4506ceb, 0xde82bde9),
INIT(0xbef9a3f7, 0xb2c67915), INIT(0xc67178f2, 0xe372532b),
INIT(0xca273ece, 0xea26619c), INIT(0xd186b8c7, 0x21c0c207),
INIT(0xeada7dd6, 0xcde0eb1e), INIT(0xf57d4f7f, 0xee6ed178),
INIT(0x06f067aa, 0x72176fba), INIT(0x0a637dc5, 0xa2c898a6),
INIT(0x113f9804, 0xbef90dae), INIT(0x1b710b35, 0x131c471b),
INIT(0x28db77f5, 0x23047d84), INIT(0x32caab7b, 0x40c72493),
INIT(0x3c9ebe0a, 0x15c9bebc), INIT(0x431d67c4, 0x9c100d4c),
INIT(0x4cc5d4be, 0xcb3e42b6), INIT(0x597f299c, 0xfc657e2a),
INIT(0x5fcb6fab, 0x3ad6faec), INIT(0x6c44198c, 0x4a475817),
};
int t;
for (t = 0; t < 16; t++)
w[t] = block[t];
for (t = 16; t < 80; t++) {
uint64_t p, q, r, tmp;
smallsigma1(p, tmp, w[t-2]);
smallsigma0(q, tmp, w[t-15]);
add(r, p, q);
add(p, r, w[t-7]);
add(w[t], p, w[t-16]);
}
a = s->h[0]; b = s->h[1]; c = s->h[2]; d = s->h[3];
e = s->h[4]; f = s->h[5]; g = s->h[6]; h = s->h[7];
for (t = 0; t < 80; t+=8) {
uint64_t tmp, p, q, r;
#define ROUND(j,a,b,c,d,e,f,g,h) do { \
bigsigma1(p, tmp, e); \
Ch(q, tmp, e, f, g); \
add(r, p, q); \
add(p, r, k[j]) ; \
add(q, p, w[j]); \
add(r, q, h); \
bigsigma0(p, tmp, a); \
Maj(tmp, q, a, b, c); \
add(q, tmp, p); \
add(p, r, d); \
d = p; \
add(h, q, r); \
} while (0)
ROUND(t+0, a,b,c,d,e,f,g,h);
ROUND(t+1, h,a,b,c,d,e,f,g);
ROUND(t+2, g,h,a,b,c,d,e,f);
ROUND(t+3, f,g,h,a,b,c,d,e);
ROUND(t+4, e,f,g,h,a,b,c,d);
ROUND(t+5, d,e,f,g,h,a,b,c);
ROUND(t+6, c,d,e,f,g,h,a,b);
ROUND(t+7, b,c,d,e,f,g,h,a);
}
{
uint64_t tmp;
#define UPDATE(state, local) ( tmp = state, add(state, tmp, local) )
UPDATE(s->h[0], a); UPDATE(s->h[1], b);
UPDATE(s->h[2], c); UPDATE(s->h[3], d);
UPDATE(s->h[4], e); UPDATE(s->h[5], f);
UPDATE(s->h[6], g); UPDATE(s->h[7], h);
}
}
/* ----------------------------------------------------------------------
* Outer SHA512 algorithm: take an arbitrary length byte string,
* convert it into 16-doubleword blocks with the prescribed padding
* at the end, and pass those blocks to the core SHA512 algorithm.
*/
static void SHA512_BinarySink_write(BinarySink *bs,
const void *p, size_t len);
static void SHA512_Init(SHA512_State *s) {
SHA512_Core_Init(s);
s->blkused = 0;
s->lenhi = s->lenlo = 0;
BinarySink_INIT(s, SHA512_BinarySink_write);
}
static void SHA384_Init(SHA512_State *s) {
SHA384_Core_Init(s);
s->blkused = 0;
s->lenhi = s->lenlo = 0;
BinarySink_INIT(s, SHA512_BinarySink_write);
}
static void SHA512_BinarySink_write(BinarySink *bs,
const void *p, size_t len)
{
SHA512_State *s = BinarySink_DOWNCAST(bs, SHA512_State);
unsigned char *q = (unsigned char *)p;
uint64_t wordblock[16];
int i;
/*
* Update the length field.
*/
s->lenlo += len;
s->lenhi += (s->lenlo < len);
if (s->blkused && s->blkused+len < BLKSIZE) {
/*
* Trivial case: just add to the block.
*/
memcpy(s->block + s->blkused, q, len);
s->blkused += len;
} else {
/*
* We must complete and process at least one block.
*/
while (s->blkused + len >= BLKSIZE) {
memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);
q += BLKSIZE - s->blkused;
len -= BLKSIZE - s->blkused;
/* Now process the block. Gather bytes big-endian into words */
for (i = 0; i < 16; i++)
wordblock[i] = GET_64BIT_MSB_FIRST(s->block + i*8);
SHA512_Block(s, wordblock);
s->blkused = 0;
}
memcpy(s->block, q, len);
s->blkused = len;
}
}
static void SHA512_Final(SHA512_State *s, unsigned char *digest) {
int i;
int pad;
unsigned char c[BLKSIZE];
uint64_t lenhi, lenlo;
if (s->blkused >= BLKSIZE-16)
pad = (BLKSIZE-16) + BLKSIZE - s->blkused;
else
pad = (BLKSIZE-16) - s->blkused;
lenhi = (s->lenhi << 3) | (s->lenlo >> (32-3));
lenlo = (s->lenlo << 3);
memset(c, 0, pad);
c[0] = 0x80;
put_data(s, &c, pad);
put_uint64(s, lenhi);
put_uint64(s, lenlo);
for (i = 0; i < 8; i++)
PUT_64BIT_MSB_FIRST(digest + i*8, s->h[i]);
}
static void SHA384_Final(SHA512_State *s, unsigned char *digest) {
unsigned char biggerDigest[512 / 8];
SHA512_Final(s, biggerDigest);
memcpy(digest, biggerDigest, 384 / 8);
}
/*
* Thin abstraction for things where hashes are pluggable.
*/
struct sha512_hash {
SHA512_State state;
ssh_hash hash;
};
static ssh_hash *sha512_new(const ssh_hashalg *alg)
{
struct sha512_hash *h = snew(struct sha512_hash);
h->hash.vt = alg;
BinarySink_DELEGATE_INIT(&h->hash, &h->state);
return ssh_hash_reset(&h->hash);
}
static void sha512_reset(ssh_hash *hash)
{
struct sha512_hash *h = container_of(hash, struct sha512_hash, hash);
SHA512_Init(&h->state);
}
static void sha512_copyfrom(ssh_hash *hashnew, ssh_hash *hashold)
{
struct sha512_hash *hold = container_of(hashold, struct sha512_hash, hash);
struct sha512_hash *hnew = container_of(hashnew, struct sha512_hash, hash);
hnew->state = hold->state;
BinarySink_COPIED(&hnew->state);
}
static void sha512_free(ssh_hash *hash)
{
struct sha512_hash *h = container_of(hash, struct sha512_hash, hash);
smemclr(h, sizeof(*h));
sfree(h);
}
static void sha512_digest(ssh_hash *hash, unsigned char *output)
{
struct sha512_hash *h = container_of(hash, struct sha512_hash, hash);
SHA512_Final(&h->state, output);
}
const ssh_hashalg ssh_sha512 = {
.new = sha512_new,
.reset = sha512_reset,
.copyfrom = sha512_copyfrom,
.digest = sha512_digest,
.free = sha512_free,
.hlen = 64,
.blocklen = BLKSIZE,
HASHALG_NAMES_BARE("SHA-512"),
};
static void sha384_reset(ssh_hash *hash)
{
struct sha512_hash *h = container_of(hash, struct sha512_hash, hash);
SHA384_Init(&h->state);
}
static void sha384_digest(ssh_hash *hash, unsigned char *output)
{
struct sha512_hash *h = container_of(hash, struct sha512_hash, hash);
SHA384_Final(&h->state, output);
}
const ssh_hashalg ssh_sha384 = {
.new = sha512_new,
.reset = sha384_reset,
.copyfrom = sha512_copyfrom,
.digest = sha384_digest,
.free = sha512_free,
.hlen = 48,
.blocklen = BLKSIZE,
HASHALG_NAMES_BARE("SHA-384"),
};