/*
 * sha2.c
 *
 * Version 1.0.0beta1
 *
 * Written by Aaron D. Gifford <me@aarongifford.com>
 *
 * Copyright 2000 Aaron D. Gifford.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holder nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTOR(S) ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTOR(S) BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <sys/endian.h>
#include <sys/types.h>
#include <strings.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "sha512.h"

#define SHA512_SHORT_BLOCK_LENGTH	(SHA512_BLOCK_LENGTH - 16)

/*
 * Macro for incrementally adding the unsigned 64-bit integer n to the
 * unsigned 128-bit integer (represented using a two-element array of
 * 64-bit words):
 */
#define ADDINC128(w,n)	{ \
	(w)[0] += (sha2_word64)(n); \
	if ((w)[0] < (n)) { \
		(w)[1]++; \
	} \
}

/*** ENDIAN REVERSAL MACROS *******************************************/
#if BYTE_ORDER == LITTLE_ENDIAN
#define REVERSE32(w,x)	{ \
	sha2_word32 tmp = (w); \
	tmp = (tmp >> 16) | (tmp << 16); \
	(x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
}
#define REVERSE64(w,x)	{ \
	sha2_word64 tmp = (w); \
	tmp = (tmp >> 32) | (tmp << 32); \
	tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
	      ((tmp & 0x00ff00ff00ff00ffULL) << 8); \
	(x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
	      ((tmp & 0x0000ffff0000ffffULL) << 16); \
}
#endif /* BYTE_ORDER == LITTLE_ENDIAN */

/* Shift-right (used in SHA-256, SHA-384, and SHA-512): */
#define R(b,x) 		((x) >> (b))
/* 32-bit Rotate-right (used in SHA-256): */
#define S32(b,x)	(((x) >> (b)) | ((x) << (32 - (b))))
/* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
#define S64(b,x)	(((x) >> (b)) | ((x) << (64 - (b))))

/* Two of six logical functions used in SHA-256, SHA-384, and SHA-512: */
#define Ch(x,y,z)	(((x) & (y)) ^ ((~(x)) & (z)))
#define Maj(x,y,z)	(((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))

/* Four of six logical functions used in SHA-384 and SHA-512: */
#define Sigma0_512(x)	(S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
#define Sigma1_512(x)	(S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
#define sigma0_512(x)	(S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7,   (x)))
#define sigma1_512(x)	(S64(19, (x)) ^ S64(61, (x)) ^ R( 6,   (x)))

typedef u_int8_t  sha2_byte;	/* Exactly 1 byte */
typedef u_int32_t sha2_word32;	/* Exactly 4 bytes */
typedef u_int64_t sha2_word64;	/* Exactly 8 bytes */

/* Initial hash value H for SHA-384 */
static const sha2_word64 sha384_initial_hash_value[8] = {
	0xcbbb9d5dc1059ed8ULL,
	0x629a292a367cd507ULL,
	0x9159015a3070dd17ULL,
	0x152fecd8f70e5939ULL,
	0x67332667ffc00b31ULL,
	0x8eb44a8768581511ULL,
	0xdb0c2e0d64f98fa7ULL,
	0x47b5481dbefa4fa4ULL
};

/* Initial hash value H for SHA-512 */
static const sha2_word64 sha512_initial_hash_value[8] = {
	0x6a09e667f3bcc908ULL,
	0xbb67ae8584caa73bULL,
	0x3c6ef372fe94f82bULL,
	0xa54ff53a5f1d36f1ULL,
	0x510e527fade682d1ULL,
	0x9b05688c2b3e6c1fULL,
	0x1f83d9abfb41bd6bULL,
	0x5be0cd19137e2179ULL
};

#if 0
/*
 * Constant used by SHA256/384/512_End() functions for converting the
 * digest to a readable hexadecimal character string:
 */
static const char *sha2_hex_digits = "0123456789abcdef";
#endif

/* Hash constant words K for SHA-384 and SHA-512: */
static const sha2_word64 K512[80] = {
	0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
	0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
	0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
	0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
	0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
	0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
	0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
	0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
	0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
	0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
	0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
	0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
	0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
	0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
	0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
	0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
	0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
	0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
	0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
	0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
	0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
	0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
	0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
	0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
	0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
	0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
	0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
	0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
	0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
	0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
	0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
	0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
	0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
	0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
	0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
	0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
	0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
	0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
	0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
	0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
};
/*** SHA-512: *********************************************************/
void SHA512_Init(SHA512_CTX* context) {
	if (context == NULL) {
		return;
	}
	bcopy(sha512_initial_hash_value, context->state, SHA512_DIGEST_LENGTH);
	bzero(context->buffer, SHA512_BLOCK_LENGTH);
	context->bitcount[0] = context->bitcount[1] =  0;
}

/* Unrolled SHA-512 round macros: */
#if BYTE_ORDER == LITTLE_ENDIAN

#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)	\
	REVERSE64(*data++, W512[j]); \
	T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
             K512[j] + W512[j]; \
	(d) += T1, \
	(h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)), \
	j++


#else /* BYTE_ORDER == LITTLE_ENDIAN */

#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)	\
	T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + \
             K512[j] + (W512[j] = *data++); \
	(d) += T1; \
	(h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
	j++

#endif /* BYTE_ORDER == LITTLE_ENDIAN */

#define ROUND512(a,b,c,d,e,f,g,h)	\
	s0 = W512[(j+1)&0x0f]; \
	s0 = sigma0_512(s0); \
	s1 = W512[(j+14)&0x0f]; \
	s1 = sigma1_512(s1); \
	T1 = (h) + Sigma1_512(e) + Ch((e), (f), (g)) + K512[j] + \
             (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0); \
	(d) += T1; \
	(h) = T1 + Sigma0_512(a) + Maj((a), (b), (c)); \
	j++
static
void
SHA512_Transform(SHA512_CTX* context, const sha2_word64* data) {
	sha2_word64	a, b, c, d, e, f, g, h, s0, s1;
	sha2_word64	T1 = 0, /*T2 = 0, */*W512 = (sha2_word64*)context->buffer;
	int		j;

	/* Initialize registers with the prev. intermediate value */
	a = context->state[0];
	b = context->state[1];
	c = context->state[2];
	d = context->state[3];
	e = context->state[4];
	f = context->state[5];
	g = context->state[6];
	h = context->state[7];

	j = 0;
	do {
		ROUND512_0_TO_15(a,b,c,d,e,f,g,h);
		ROUND512_0_TO_15(h,a,b,c,d,e,f,g);
		ROUND512_0_TO_15(g,h,a,b,c,d,e,f);
		ROUND512_0_TO_15(f,g,h,a,b,c,d,e);
		ROUND512_0_TO_15(e,f,g,h,a,b,c,d);
		ROUND512_0_TO_15(d,e,f,g,h,a,b,c);
		ROUND512_0_TO_15(c,d,e,f,g,h,a,b);
		ROUND512_0_TO_15(b,c,d,e,f,g,h,a);
	} while (j < 16);

	/* Now for the remaining rounds up to 79: */
	do {
		ROUND512(a,b,c,d,e,f,g,h);
		ROUND512(h,a,b,c,d,e,f,g);
		ROUND512(g,h,a,b,c,d,e,f);
		ROUND512(f,g,h,a,b,c,d,e);
		ROUND512(e,f,g,h,a,b,c,d);
		ROUND512(d,e,f,g,h,a,b,c);
		ROUND512(c,d,e,f,g,h,a,b);
		ROUND512(b,c,d,e,f,g,h,a);
	} while (j < 80);

	/* Compute the current intermediate hash value */
	context->state[0] += a;
	context->state[1] += b;
	context->state[2] += c;
	context->state[3] += d;
	context->state[4] += e;
	context->state[5] += f;
	context->state[6] += g;
	context->state[7] += h;

	/* Clean up */
	a = b = c = d = e = f = g = h = T1 = 0;
}

void SHA512_Update(SHA512_CTX* context, const void *data_arg, size_t len) {
	const sha2_byte *data = (const sha2_byte *)data_arg;
	unsigned int	freespace, usedspace;

	if (len == 0) {
		/* Calling with no data is valid - we do nothing */
		return;
	}

	/* Sanity check: */
	assert(context != NULL && data != NULL);

	usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
	if (usedspace > 0) {
		/* Calculate how much free space is available in the buffer */
		freespace = SHA512_BLOCK_LENGTH - usedspace;

		if (len >= freespace) {
			/* Fill the buffer completely and process it */
			bcopy(data, &context->buffer[usedspace], freespace);
			ADDINC128(context->bitcount, freespace << 3);
			len -= freespace;
			data += freespace;
			SHA512_Transform(context, (sha2_word64*)context->buffer);
		} else {
			/* The buffer is not yet full */
			bcopy(data, &context->buffer[usedspace], len);
			ADDINC128(context->bitcount, len << 3);
			/* Clean up: */
			usedspace = freespace = 0;
			return;
		}
	}
	while (len >= SHA512_BLOCK_LENGTH) {
		/* Process as many complete blocks as we can */
		SHA512_Transform(context, (const sha2_word64*)data);
		ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
		len -= SHA512_BLOCK_LENGTH;
		data += SHA512_BLOCK_LENGTH;
	}
	if (len > 0) {
		/* There's left-overs, so save 'em */
		bcopy(data, context->buffer, len);
		ADDINC128(context->bitcount, len << 3);
	}
	/* Clean up: */
	usedspace = freespace = 0;
}

static
void SHA512_Last(SHA512_CTX* context) {
	unsigned int	usedspace;

	usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
#if BYTE_ORDER == LITTLE_ENDIAN
	/* Convert FROM host byte order */
	REVERSE64(context->bitcount[0],context->bitcount[0]);
	REVERSE64(context->bitcount[1],context->bitcount[1]);
#endif
	if (usedspace > 0) {
		/* Begin padding with a 1 bit: */
		context->buffer[usedspace++] = 0x80;

		if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
			/* Set-up for the last transform: */
			bzero(&context->buffer[usedspace], SHA512_SHORT_BLOCK_LENGTH - usedspace);
		} else {
			if (usedspace < SHA512_BLOCK_LENGTH) {
				bzero(&context->buffer[usedspace], SHA512_BLOCK_LENGTH - usedspace);
			}
			/* Do second-to-last transform: */
			SHA512_Transform(context, (sha2_word64*)context->buffer);

			/* And set-up for the last transform: */
			bzero(context->buffer, SHA512_BLOCK_LENGTH - 2);
		}
	} else {
		/* Prepare for final transform: */
		bzero(context->buffer, SHA512_SHORT_BLOCK_LENGTH);

		/* Begin padding with a 1 bit: */
		*context->buffer = 0x80;
	}
	/* Store the length of input data (in bits): */
	*(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
	*(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];

	/* Final transform: */
	SHA512_Transform(context, (sha2_word64*)context->buffer);
}

void SHA512_Final(unsigned char digest[], SHA512_CTX* context) {
	sha2_word64	*d = (sha2_word64*)digest;

	/* Sanity check: */
	assert(context != NULL);

	/* If no digest buffer is passed, we don't bother doing this: */
	if (digest != NULL) {
		SHA512_Last(context);

		/* Save the hash data for output: */
#if BYTE_ORDER == LITTLE_ENDIAN
		{
			/* Convert TO host byte order */
			int	j;
			for (j = 0; j < 8; j++) {
				REVERSE64(context->state[j],context->state[j]);
				*d++ = context->state[j];
			}
		}
#else
		bcopy(context->state, d, SHA512_DIGEST_LENGTH);
#endif
	}

	/* Zero out state data */
	bzero(context, sizeof(*context));
}

#if 0
char *SHA512_End(SHA512_CTX* context, char *buffer) {
	sha2_byte	digest[SHA512_DIGEST_LENGTH], *d = digest;
	int		i;

	/* Sanity check: */
	assert(context != NULL);

	if (buffer != NULL) {
		SHA512_Final(digest, context);

		for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
			*buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
			*buffer++ = sha2_hex_digits[*d & 0x0f];
			d++;
		}
		*buffer = (char)0;
	} else {
		bzero(context, sizeof(*context));
	}
	bzero(digest, SHA512_DIGEST_LENGTH);
	return buffer;
}

char* SHA512_Data(const void *data, size_t len, char *digest) {
	SHA512_CTX	context;

	SHA512_Init(&context);
	SHA512_Update(&context, data, len);
	return SHA512_End(&context, digest);
}
#endif


/*** SHA-384: *********************************************************/
void SHA384_Init(SHA384_CTX* context) {
	if (context == NULL) {
		return;
	}
	bcopy(sha384_initial_hash_value, context->state, SHA512_DIGEST_LENGTH);
	bzero(context->buffer, SHA384_BLOCK_LENGTH);
	context->bitcount[0] = context->bitcount[1] = 0;
}

void SHA384_Update(SHA384_CTX* context, const sha2_byte* data, size_t len) {
	SHA512_Update((SHA512_CTX*)context, data, len);
}

void SHA384_Final(sha2_byte digest[], SHA384_CTX* context) {
	sha2_word64	*d = (sha2_word64*)digest;

	/* Sanity check: */
	assert(context != NULL);

	/* If no digest buffer is passed, we don't bother doing this: */
	if (digest != NULL) {
		SHA512_Last((SHA512_CTX*)context);

		/* Save the hash data for output: */
#if BYTE_ORDER == LITTLE_ENDIAN
		{
			/* Convert TO host byte order */
			int	j;
			for (j = 0; j < 6; j++) {
				REVERSE64(context->state[j],context->state[j]);
				*d++ = context->state[j];
			}
		}
#else
		bcopy(context->state, d, SHA384_DIGEST_LENGTH);
#endif
	}

	/* Zero out state data */
	bzero(context, sizeof(*context));
}

#if 0
char *SHA384_End(SHA384_CTX* context, char buffer[]) {
	sha2_byte	digest[SHA384_DIGEST_LENGTH], *d = digest;
	int		i;

	/* Sanity check: */
	assert(context != NULL);

	if (buffer != NULL) {
		SHA384_Final(digest, context);

		for (i = 0; i < SHA384_DIGEST_LENGTH; i++) {
			*buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
			*buffer++ = sha2_hex_digits[*d & 0x0f];
			d++;
		}
		*buffer = (char)0;
	} else {
		bzero(context, sizeof(*context));
	}
	bzero(digest, SHA384_DIGEST_LENGTH);
	return buffer;
}

char* SHA384_Data(const sha2_byte* data, size_t len, char digest[SHA384_DIGEST_STRING_LENGTH]) {
	SHA384_CTX	context;

	SHA384_Init(&context);
	SHA384_Update(&context, data, len);
	return SHA384_End(&context, digest);
}
#endif