/*
 * FILE:	sha2.c
 * AUTHOR:	Aaron D. Gifford <me@aarongifford.com>
 * 
 * Copyright (c) 2000-2001, 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 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 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 <string.h>	/* memcpy()/memset() or bcopy()/bzero() */
#include <assert.h>	/* assert() */

#include "libvx32/words.h"	// XXX
#ifndef BYTE_ORDER
#define BYTE_ORDER LITTLE_ENDIAN 	// XXX
#endif

#include "sha2.h"


/*
 * ASSERT NOTE:
 * Some sanity checking code is included using assert().  On my FreeBSD
 * system, this additional code can be removed by compiling with NDEBUG
 * defined.  Check your own systems manpage on assert() to see how to
 * compile WITHOUT the sanity checking code on your system.
 *
 * UNROLLED TRANSFORM LOOP NOTE:
 * You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
 * loop version for the hash transform rounds (defined using macros
 * later in this file).  Either define on the command line, for example:
 *
 *   cc -DSHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
 *
 * or define below:
 *
 *   #define SHA2_UNROLL_TRANSFORM
 *
 */


/*** SHA-256/384/512 Machine Architecture Definitions *****************/
/*
 * BYTE_ORDER NOTE:
 *
 * Please make sure that your system defines BYTE_ORDER.  If your
 * architecture is little-endian, make sure it also defines
 * LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
 * equivilent.
 *
 * If your system does not define the above, then you can do so by
 * hand like this:
 *
 *   #define LITTLE_ENDIAN 1234
 *   #define BIG_ENDIAN    4321
 *
 * And for little-endian machines, add:
 *
 *   #define BYTE_ORDER LITTLE_ENDIAN 
 *
 * Or for big-endian machines:
 *
 *   #define BYTE_ORDER BIG_ENDIAN
 *
 * The FreeBSD machine this was written on defines BYTE_ORDER
 * appropriately by including <sys/types.h> (which in turn includes
 * <machine/endian.h> where the appropriate definitions are actually
 * made).
 */
#if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
#error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
#endif

/*
 * Define the followingsha2_* types to types of the correct length on
 * the native archtecture.   Most BSD systems and Linux define u_intXX_t
 * types.  Machines with very recent ANSI C headers, can use the
 * uintXX_t definintions from inttypes.h by defining SHA2_USE_INTTYPES_H
 * during compile or in the sha.h header file.
 *
 * Machines that support neither u_intXX_t nor inttypes.h's uintXX_t
 * will need to define these three typedefs below (and the appropriate
 * ones in sha.h too) by hand according to their system architecture.
 *
 * Thank you, Jun-ichiro itojun Hagino, for suggesting using u_intXX_t
 * types and pointing out recent ANSI C support for uintXX_t in inttypes.h.
 */

typedef uint8_t  sha2_byte;	/* Exactly 1 byte */
typedef uint32_t sha2_word32;	/* Exactly 4 bytes */
typedef uint64_t sha2_word64;	/* Exactly 8 bytes */


/*** SHA-256/384/512 Various Length Definitions ***********************/
/* NOTE: Most of these are in sha2.h */
#define SHA256_SHORT_BLOCK_LENGTH	(SHA256_BLOCK_LENGTH - 8)
#define SHA384_SHORT_BLOCK_LENGTH	(SHA384_BLOCK_LENGTH - 16)
#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]++; \
	} \
}

/*
 * Macros for copying blocks of memory and for zeroing out ranges
 * of memory.  Using these macros makes it easy to switch from
 * using memset()/memcpy() and using bzero()/bcopy().
 *
 * Please define either SHA2_USE_MEMSET_MEMCPY or define
 * SHA2_USE_BZERO_BCOPY depending on which function set you
 * choose to use:
 */
#if !defined(SHA2_USE_MEMSET_MEMCPY) && !defined(SHA2_USE_BZERO_BCOPY)
/* Default to memset()/memcpy() if no option is specified */
#define	SHA2_USE_MEMSET_MEMCPY	1
#endif
#if defined(SHA2_USE_MEMSET_MEMCPY) && defined(SHA2_USE_BZERO_BCOPY)
/* Abort with an error if BOTH options are defined */
#error Define either SHA2_USE_MEMSET_MEMCPY or SHA2_USE_BZERO_BCOPY, not both!
#endif

#ifdef SHA2_USE_MEMSET_MEMCPY
#define MEMSET_BZERO(p,l)	memset((p), 0, (l))
#define MEMCPY_BCOPY(d,s,l)	memcpy((d), (s), (l))
#endif
#ifdef SHA2_USE_BZERO_BCOPY
#define MEMSET_BZERO(p,l)	bzero((p), (l))
#define MEMCPY_BCOPY(d,s,l)	bcopy((s), (d), (l))
#endif


/*** THE SIX LOGICAL FUNCTIONS ****************************************/
/*
 * Bit shifting and rotation (used by the six SHA-XYZ logical functions:
 *
 *   NOTE:  The naming of R and S appears backwards here (R is a SHIFT and
 *   S is a ROTATION) because the SHA-256/384/512 description document
 *   (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
 *   same "backwards" definition.
 */
/* 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-256: */
#define Sigma0_256(x)	(S32(2,  (x)) ^ S32(13, (x)) ^ S32(22, (x)))
#define Sigma1_256(x)	(S32(6,  (x)) ^ S32(11, (x)) ^ S32(25, (x)))
#define sigma0_256(x)	(S32(7,  (x)) ^ S32(18, (x)) ^ R(3 ,   (x)))
#define sigma1_256(x)	(S32(17, (x)) ^ S32(19, (x)) ^ R(10,   (x)))

/* 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)))


/*** INTERNAL FUNCTION PROTOTYPES *************************************/
/* NOTE: These should not be accessed directly from outside this
 * library -- they are intended for private internal visibility/use
 * only.
 */
void SHA512_Last(SHA512_CTX*);
void SHA512_Transform(SHA512_CTX*, const sha2_word64*);


/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/

/* Hash constant words K for SHA-384 and SHA-512: */
const static 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
};

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

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


/*** SHA-512: *********************************************************/
void SHA512_Init(SHA512_CTX* context) {
	if (context == (SHA512_CTX*)0) {
		return;
	}
	MEMCPY_BCOPY(context->state, sha512_initial_hash_value, SHA512_DIGEST_LENGTH);
	MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH);
	context->bitcount[0] = context->bitcount[1] =  0;
}

#ifdef SHA2_UNROLL_TRANSFORM

/* Unrolled SHA-512 round macros: */

#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)	\
	W512[j] = btoh64(*data++); \
	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++

#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++

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, *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;
}

#else /* SHA2_UNROLL_TRANSFORM */

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, T2, *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 {
		/* Convert TO host byte order */
		W512[j] = btoh64(*data++);

		/* Apply the SHA-512 compression function to update a..h */
		T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
		T2 = Sigma0_512(a) + Maj(a, b, c);
		h = g;
		g = f;
		f = e;
		e = d + T1;
		d = c;
		c = b;
		b = a;
		a = T1 + T2;

		j++;
	} while (j < 16);

	do {
		/* Part of the message block expansion: */
		s0 = W512[(j+1)&0x0f];
		s0 = sigma0_512(s0);
		s1 = W512[(j+14)&0x0f];
		s1 =  sigma1_512(s1);

		/* Apply the SHA-512 compression function to update a..h */
		T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
		     (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
		T2 = Sigma0_512(a) + Maj(a, b, c);
		h = g;
		g = f;
		f = e;
		e = d + T1;
		d = c;
		c = b;
		b = a;
		a = T1 + T2;

		j++;
	} 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 = T2 = 0;
}

#endif /* SHA2_UNROLL_TRANSFORM */

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

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

	/* Sanity check: */
	assert(context != (SHA512_CTX*)0 && data != (sha2_byte*)0);

	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 */
			MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
			ADDINC128(context->bitcount, freespace << 3);
			len -= freespace;
			data += freespace;
			SHA512_Transform(context, (sha2_word64*)context->buffer);
		} else {
			/* The buffer is not yet full */
			MEMCPY_BCOPY(&context->buffer[usedspace], data, 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, (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 */
		MEMCPY_BCOPY(context->buffer, data, len);
		ADDINC128(context->bitcount, len << 3);
	}
	/* Clean up: */
	usedspace = freespace = 0;
}

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

	usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;

	/* Convert FROM host byte order */
	context->bitcount[0] = htob64(context->bitcount[0]);
	context->bitcount[1] = htob64(context->bitcount[1]);

	/* Begin padding with a 1 bit: */
	context->buffer[usedspace++] = 0x80;

	if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {

		/* Set-up for the last transform: */
		MEMSET_BZERO(&context->buffer[usedspace],
				SHA512_SHORT_BLOCK_LENGTH - usedspace);
	} else {
		MEMSET_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: */
		MEMSET_BZERO(context->buffer, SHA512_SHORT_BLOCK_LENGTH);
	}

	/* 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(sha2_byte digest[], SHA512_CTX* context) {
	sha2_word64	*d = (sha2_word64*)digest;

	/* Sanity check: */
	assert(context != (SHA512_CTX*)0);

	/* If no digest buffer is passed, we don't bother doing this: */
	if (digest != (sha2_byte*)0) {
		SHA512_Last(context);

		/* Save the hash data for output: */
		/* Convert FROM host byte order */
		for (int j = 0; j < 8; j++) {
			*d++ = htob64(context->state[j]);
		}
	}

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


/*** SHA-384: *********************************************************/
void SHA384_Init(SHA384_CTX* context) {
	if (context == (SHA384_CTX*)0) {
		return;
	}
	MEMCPY_BCOPY(context->state, sha384_initial_hash_value, SHA512_DIGEST_LENGTH);
	MEMSET_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 != (SHA384_CTX*)0);

	/* If no digest buffer is passed, we don't bother doing this: */
	if (digest != (sha2_byte*)0) {
		SHA512_Last((SHA512_CTX*)context);

		/* Save the hash data for output */
		for (int j = 0; j < 6; j++) {
			*d++ = htob64(context->state[j]);
		}
	}

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

void SHA384(const sha2_byte* data, size_t len,
		char digest[SHA384_DIGEST_LENGTH]) {
	SHA384_CTX	context;

	SHA384_Init(&context);
	SHA384_Update(&context, data, len);
	SHA384_Final(digest, &context);
}

