Commit 4035e0e7 authored by Pavel Tvrdík's avatar Pavel Tvrdík

Add SHA-224/256 and HMAC-SHA-224/256 crypto hash

parent 5d0c36f1
sha256.c
sha256.h
sha1.c
sha1.h
birdlib.h
......
/*
* BIRD Library -- SHA-256 and SHA-224 Hash Functions,
* HMAC-SHA-256 and HMAC-SHA-224 Functions
*
* (c) 2015 CZ.NIC z.s.p.o.
*
* Based on the code from libgcrypt-1.6.0, which is
* (c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "lib/sha256.h"
#include "lib/unaligned.h"
static uint sha256_transform(void *ctx, const byte *data, size_t nblks);
void
sha256_init(struct sha256_context *ctx)
{
ctx->h0 = 0x6a09e667;
ctx->h1 = 0xbb67ae85;
ctx->h2 = 0x3c6ef372;
ctx->h3 = 0xa54ff53a;
ctx->h4 = 0x510e527f;
ctx->h5 = 0x9b05688c;
ctx->h6 = 0x1f83d9ab;
ctx->h7 = 0x5be0cd19;
ctx->nblocks = 0;
ctx->nblocks_high = 0;
ctx->count = 0;
ctx->blocksize = 64;
ctx->transform = sha256_transform;
}
void
sha224_init(struct sha224_context *ctx)
{
ctx->h0 = 0xc1059ed8;
ctx->h1 = 0x367cd507;
ctx->h2 = 0x3070dd17;
ctx->h3 = 0xf70e5939;
ctx->h4 = 0xffc00b31;
ctx->h5 = 0x68581511;
ctx->h6 = 0x64f98fa7;
ctx->h7 = 0xbefa4fa4;
ctx->nblocks = 0;
ctx->nblocks_high = 0;
ctx->count = 0;
ctx->blocksize = 64;
ctx->transform = sha256_transform;
}
/* (4.2) same as SHA-1's F1. */
static inline u32
f1(u32 x, u32 y, u32 z)
{
return (z ^ (x & (y ^ z)));
}
/* (4.3) same as SHA-1's F3 */
static inline u32
f3(u32 x, u32 y, u32 z)
{
return ((x & y) | (z & (x|y)));
}
/* Bitwise rotation of an uint to the right */
static inline u32 ror(u32 x, int n)
{
return ( (x >> (n&(32-1))) | (x << ((32-n)&(32-1))) );
}
/* (4.4) */
static inline u32
sum0(u32 x)
{
return (ror(x, 2) ^ ror(x, 13) ^ ror(x, 22));
}
/* (4.5) */
static inline u32
sum1(u32 x)
{
return (ror(x, 6) ^ ror(x, 11) ^ ror(x, 25));
}
/*
Transform the message X which consists of 16 32-bit-words. See FIPS
180-2 for details. */
#define S0(x) (ror((x), 7) ^ ror((x), 18) ^ ((x) >> 3)) /* (4.6) */
#define S1(x) (ror((x), 17) ^ ror((x), 19) ^ ((x) >> 10)) /* (4.7) */
#define R(a,b,c,d,e,f,g,h,k,w) \
do \
{ \
t1 = (h) + sum1((e)) + f1((e),(f),(g)) + (k) + (w); \
t2 = sum0((a)) + f3((a),(b),(c)); \
h = g; \
g = f; \
f = e; \
e = d + t1; \
d = c; \
c = b; \
b = a; \
a = t1 + t2; \
} while (0)
/*
The SHA-256 core: Transform the message X which consists of 16
32-bit-words. See FIPS 180-2 for details.
*/
static uint
sha256_transform_block(struct sha256_context *ctx, const byte *data)
{
static const u32 K[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
u32 a,b,c,d,e,f,g,h,t1,t2;
u32 w[64];
int i;
a = ctx->h0;
b = ctx->h1;
c = ctx->h2;
d = ctx->h3;
e = ctx->h4;
f = ctx->h5;
g = ctx->h6;
h = ctx->h7;
for (i = 0; i < 16; i++)
w[i] = get_u32(data + i * 4);
for (; i < 64; i++)
w[i] = S1(w[i-2]) + w[i-7] + S0(w[i-15]) + w[i-16];
for (i = 0; i < 64;)
{
t1 = h + sum1(e) + f1(e, f, g) + K[i] + w[i];
t2 = sum0 (a) + f3(a, b, c);
d += t1;
h = t1 + t2;
t1 = g + sum1(d) + f1(d, e, f) + K[i+1] + w[i+1];
t2 = sum0 (h) + f3(h, a, b);
c += t1;
g = t1 + t2;
t1 = f + sum1(c) + f1(c, d, e) + K[i+2] + w[i+2];
t2 = sum0 (g) + f3(g, h, a);
b += t1;
f = t1 + t2;
t1 = e + sum1(b) + f1(b, c, d) + K[i+3] + w[i+3];
t2 = sum0 (f) + f3(f, g, h);
a += t1;
e = t1 + t2;
t1 = d + sum1(a) + f1(a, b, c) + K[i+4] + w[i+4];
t2 = sum0 (e) + f3(e, f, g);
h += t1;
d = t1 + t2;
t1 = c + sum1(h) + f1(h, a, b) + K[i+5] + w[i+5];
t2 = sum0 (d) + f3(d, e, f);
g += t1;
c = t1 + t2;
t1 = b + sum1(g) + f1(g, h, a) + K[i+6] + w[i+6];
t2 = sum0 (c) + f3(c, d, e);
f += t1;
b = t1 + t2;
t1 = a + sum1(f) + f1(f, g, h) + K[i+7] + w[i+7];
t2 = sum0 (b) + f3(b, c, d);
e += t1;
a = t1 + t2;
i += 8;
}
ctx->h0 += a;
ctx->h1 += b;
ctx->h2 += c;
ctx->h3 += d;
ctx->h4 += e;
ctx->h5 += f;
ctx->h6 += g;
ctx->h7 += h;
return /*burn_stack*/ 74*4+32;
}
#undef S0
#undef S1
#undef R
static uint
sha256_transform(void *ctx, const byte *data, size_t nblks)
{
struct sha256_context *hd = ctx;
uint burn;
do
{
burn = sha256_transform_block(hd, data);
data += 64;
}
while (--nblks);
return burn;
}
/* Common function to write a chunk of data to the transform function
of a hash algorithm. Note that the use of the term "block" does
not imply a fixed size block. Note that we explicitly allow to use
this function after the context has been finalized; the result does
not have any meaning but writing after finalize is sometimes
helpful to mitigate timing attacks. */
void
sha256_update(struct sha256_context *ctx, const byte *in_buf, size_t in_len)
{
const uint blocksize = ctx->blocksize;
size_t inblocks;
if (sizeof(ctx->buf) < blocksize)
debug("BUG: in file %s at line %d", __FILE__ , __LINE__);
if (ctx->count == blocksize) /* Flush the buffer. */
{
ctx->transform(ctx, ctx->buf, 1);
ctx->count = 0;
if (!++ctx->nblocks)
ctx->nblocks_high++;
}
if (!in_buf)
return;
if (ctx->count)
{
for (; in_len && ctx->count < blocksize; in_len--)
ctx->buf[ctx->count++] = *in_buf++;
sha256_update(ctx, NULL, 0);
if (!in_len)
return;
}
if (in_len >= blocksize)
{
inblocks = in_len / blocksize;
ctx->transform(ctx, in_buf, inblocks);
ctx->count = 0;
ctx->nblocks_high += (ctx->nblocks + inblocks < inblocks);
ctx->nblocks += inblocks;
in_len -= inblocks * blocksize;
in_buf += inblocks * blocksize;
}
for (; in_len && ctx->count < blocksize; in_len--)
ctx->buf[ctx->count++] = *in_buf++;
}
/*
The routine finally terminates the computation and returns the
digest. The handle is prepared for a new cycle, but adding bytes
to the handle will the destroy the returned buffer. Returns: 32
bytes with the message the digest. */
byte*
sha256_final(struct sha256_context *ctx)
{
u32 t, th, msb, lsb;
byte *p;
sha256_update(ctx, NULL, 0); /* flush */;
t = ctx->nblocks;
if (sizeof t == sizeof ctx->nblocks)
th = ctx->nblocks_high;
else
th = 0;
/* multiply by 64 to make a byte count */
lsb = t << 6;
msb = (th << 6) | (t >> 26);
/* add the count */
t = lsb;
if ((lsb += ctx->count) < t)
msb++;
/* multiply by 8 to make a bit count */
t = lsb;
lsb <<= 3;
msb <<= 3;
msb |= t >> 29;
if (ctx->count < 56)
{ /* enough room */
ctx->buf[ctx->count++] = 0x80; /* pad */
while (ctx->count < 56)
ctx->buf[ctx->count++] = 0; /* pad */
}
else
{ /* need one extra block */
ctx->buf[ctx->count++] = 0x80; /* pad character */
while (ctx->count < 64)
ctx->buf[ctx->count++] = 0;
sha256_update(ctx, NULL, 0); /* flush */;
memset (ctx->buf, 0, 56 ); /* fill next block with zeroes */
}
/* append the 64 bit count */
put_u32(ctx->buf + 56, msb);
put_u32(ctx->buf + 60, lsb);
sha256_transform(ctx, ctx->buf, 1);
p = ctx->buf;
#define X(a) do { put_u32(p, ctx->h##a); p += 4; } while(0)
X(0);
X(1);
X(2);
X(3);
X(4);
X(5);
X(6);
X(7);
#undef X
return ctx->buf;
}
/*
* SHA256-HMAC
*/
static void
sha256_hash_buffer(byte *outbuf, const byte *buffer, size_t length)
{
struct sha256_context hd_tmp;
sha256_init(&hd_tmp);
sha256_update(&hd_tmp, buffer, length);
memcpy(outbuf, sha256_final(&hd_tmp), SHA256_SIZE);
}
void
sha256_hmac_init(struct sha256_hmac_context *ctx, const byte *key, size_t keylen)
{
byte keybuf[SHA256_BLOCK_SIZE], buf[SHA256_BLOCK_SIZE];
/* Hash the key if necessary */
if (keylen <= SHA256_BLOCK_SIZE)
{
memcpy(keybuf, key, keylen);
bzero(keybuf + keylen, SHA256_BLOCK_SIZE - keylen);
}
else
{
sha256_hash_buffer(keybuf, key, keylen);
bzero(keybuf + SHA256_SIZE, SHA256_BLOCK_SIZE - SHA256_SIZE);
}
/* Initialize the inner digest */
sha256_init(&ctx->ictx);
int i;
for (i = 0; i < SHA256_BLOCK_SIZE; i++)
buf[i] = keybuf[i] ^ 0x36;
sha256_update(&ctx->ictx, buf, SHA256_BLOCK_SIZE);
/* Initialize the outer digest */
sha256_init(&ctx->octx);
for (i = 0; i < SHA256_BLOCK_SIZE; i++)
buf[i] = keybuf[i] ^ 0x5c;
sha256_update(&ctx->octx, buf, SHA256_BLOCK_SIZE);
}
void sha256_hmac_update(struct sha256_hmac_context *ctx, const byte *buf, size_t buflen)
{
/* Just update the inner digest */
sha256_update(&ctx->ictx, buf, buflen);
}
byte *sha256_hmac_final(struct sha256_hmac_context *ctx)
{
/* Finish the inner digest */
byte *isha = sha256_final(&ctx->ictx);
/* Finish the outer digest */
sha256_update(&ctx->octx, isha, SHA256_SIZE);
return sha256_final(&ctx->octx);
}
/*
* SHA224-HMAC
*/
static void
sha224_hash_buffer(byte *outbuf, const byte *buffer, size_t length)
{
struct sha224_context hd_tmp;
sha224_init(&hd_tmp);
sha224_update(&hd_tmp, buffer, length);
memcpy(outbuf, sha224_final(&hd_tmp), SHA224_SIZE);
}
void
sha224_hmac_init(struct sha224_hmac_context *ctx, const byte *key, size_t keylen)
{
byte keybuf[SHA224_BLOCK_SIZE], buf[SHA224_BLOCK_SIZE];
/* Hash the key if necessary */
if (keylen <= SHA224_BLOCK_SIZE)
{
memcpy(keybuf, key, keylen);
bzero(keybuf + keylen, SHA224_BLOCK_SIZE - keylen);
}
else
{
sha224_hash_buffer(keybuf, key, keylen);
bzero(keybuf + SHA224_SIZE, SHA224_BLOCK_SIZE - SHA224_SIZE);
}
/* Initialize the inner digest */
sha224_init(&ctx->ictx);
int i;
for (i = 0; i < SHA224_BLOCK_SIZE; i++)
buf[i] = keybuf[i] ^ 0x36;
sha224_update(&ctx->ictx, buf, SHA224_BLOCK_SIZE);
/* Initialize the outer digest */
sha224_init(&ctx->octx);
for (i = 0; i < SHA224_BLOCK_SIZE; i++)
buf[i] = keybuf[i] ^ 0x5c;
sha224_update(&ctx->octx, buf, SHA224_BLOCK_SIZE);
}
void sha224_hmac_update(struct sha224_hmac_context *ctx, const byte *buf, size_t buflen)
{
/* Just update the inner digest */
sha256_update(&ctx->ictx, buf, buflen);
}
byte *sha224_hmac_final(struct sha224_hmac_context *ctx)
{
/* Finish the inner digest */
byte *isha = sha224_final(&ctx->ictx);
/* Finish the outer digest */
sha224_update(&ctx->octx, isha, SHA224_SIZE);
return sha224_final(&ctx->octx);
}
/*
* BIRD Library -- SHA-256 and SHA-224 Hash Functions,
* HMAC-SHA-256 and HMAC-SHA-224 Functions
*
* (c) 2015 CZ.NIC z.s.p.o.
*
* Based on the code from libgcrypt-1.6.0, which is
* (c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_SHA256_H_
#define _BIRD_SHA256_H_
#include "nest/bird.h"
#define SHA224_SIZE 28
#define SHA224_HEX_SIZE 57
#define SHA224_BLOCK_SIZE 64
#define SHA256_SIZE 32
#define SHA256_HEX_SIZE 65
#define SHA256_BLOCK_SIZE 64
struct sha256_context {
u32 h0,h1,h2,h3,h4,h5,h6,h7;
byte buf[128]; /* 128 is for SHA384 and SHA512 support, otherwise for SHA224 and SHA256 is 64 enough */
u32 nblocks;
u32 nblocks_high;
int count;
u32 blocksize;
uint (*transform)(void *c, const byte *blks, size_t nblks);
};
#define sha224_context sha256_context /* aliasing 'struct sha224_context' to 'struct sha256_context' */
void sha256_init(struct sha256_context *ctx);
void sha224_init(struct sha224_context *ctx);
void sha256_update(struct sha256_context *ctx, const byte *in_buf, size_t in_len);
static inline void sha224_update(struct sha224_context *ctx, const byte *in_buf, size_t in_len)
{
sha256_update(ctx, in_buf, in_len);
}
byte* sha256_final(struct sha256_context *ctx);
static inline byte* sha224_final(struct sha224_context *ctx)
{
return sha256_final(ctx);
}
/*
* HMAC-SHA256, HMAC-SHA224
*/
struct sha256_hmac_context
{
struct sha256_context ictx;
struct sha256_context octx;
};
#define sha224_hmac_context sha256_hmac_context /* aliasing 'struct sha224_hmac_context' to 'struct sha256_hmac_context' */
void sha256_hmac_init(struct sha256_hmac_context *ctx, const byte *key, size_t keylen);
void sha224_hmac_init(struct sha224_hmac_context *ctx, const byte *key, size_t keylen);
void sha256_hmac_update(struct sha256_hmac_context *ctx, const byte *buf, size_t buflen);
void sha224_hmac_update(struct sha224_hmac_context *ctx, const byte *buf, size_t buflen);
byte *sha256_hmac_final(struct sha256_hmac_context *ctx);
byte *sha224_hmac_final(struct sha224_hmac_context *ctx);
#endif /* _BIRD_SHA256_H_ */
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment