/* $NetBSD: sha2.c,v 1.27 2026/01/08 11:31:24 nia Exp $ */
/*      $KAME: sha2.c,v 1.9 2003/07/20 00:28:38 itojun Exp $    */

/*
 * 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.
 *
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>

#if defined(_KERNEL) || defined(_STANDALONE)
__KERNEL_RCSID(0, "$NetBSD: sha2.c,v 1.27 2026/01/08 11:31:24 nia Exp $");

#include <sys/param.h>  /* XXX: to pull <machine/macros.h> for vax memset(9) */
#include <lib/libkern/libkern.h>

#else

#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: sha2.c,v 1.27 2026/01/08 11:31:24 nia Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <string.h>

#endif

#ifndef _LIBC_INTERNAL
#define _LIBC_INTERNAL
#endif

#include <sys/types.h>
#include <sys/sha2.h>

#if !HAVE_NBTOOL_CONFIG_H || HAVE_SYS_ENDIAN_H
# include <sys/endian.h>
#endif

/*** 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] += (uint64_t)(n); \
        if ((w)[0] < (n)) { \
                (w)[1]++; \
        } \
}

/*** 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.
 */
static void SHA512_Last(SHA512_CTX *);


/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
/* Hash constant words K for SHA-256: */
static const uint32_t K256[64] = {
        0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
        0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
        0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
        0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
        0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
        0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
        0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
        0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
        0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
        0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
        0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
        0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
        0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
        0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
        0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
        0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
};

/* Initial hash value H for SHA-224: */
static const uint32_t sha224_initial_hash_value[8] = {
        0xc1059ed8UL,
        0x367cd507UL,
        0x3070dd17UL,
        0xf70e5939UL,
        0xffc00b31UL,
        0x68581511UL,
        0x64f98fa7UL,
        0xbefa4fa4UL
};

/* Initial hash value H for SHA-256: */
static const uint32_t sha256_initial_hash_value[8] = {
        0x6a09e667UL,
        0xbb67ae85UL,
        0x3c6ef372UL,
        0xa54ff53aUL,
        0x510e527fUL,
        0x9b05688cUL,
        0x1f83d9abUL,
        0x5be0cd19UL
};

/* Hash constant words K for SHA-384 and SHA-512: */
static const uint64_t 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 */
static const uint64_t sha384_initial_hash_value[8] = {
        0xcbbb9d5dc1059ed8ULL,
        0x629a292a367cd507ULL,
        0x9159015a3070dd17ULL,
        0x152fecd8f70e5939ULL,
        0x67332667ffc00b31ULL,
        0x8eb44a8768581511ULL,
        0xdb0c2e0d64f98fa7ULL,
        0x47b5481dbefa4fa4ULL
};

/* Initial hash value H for SHA-512 */
static const uint64_t sha512_initial_hash_value[8] = {
        0x6a09e667f3bcc908ULL,
        0xbb67ae8584caa73bULL,
        0x3c6ef372fe94f82bULL,
        0xa54ff53a5f1d36f1ULL,
        0x510e527fade682d1ULL,
        0x9b05688c2b3e6c1fULL,
        0x1f83d9abfb41bd6bULL,
        0x5be0cd19137e2179ULL
};

#if !defined(_KERNEL) && !defined(_STANDALONE)
#if defined(__weak_alias)
__weak_alias(SHA224_Init,_SHA224_Init) 
__weak_alias(SHA224_Update,_SHA224_Update)
__weak_alias(SHA224_Final,_SHA224_Final)
__weak_alias(SHA224_Transform,_SHA224_Transform)

__weak_alias(SHA256_Init,_SHA256_Init) 
__weak_alias(SHA256_Update,_SHA256_Update)
__weak_alias(SHA256_Final,_SHA256_Final)
__weak_alias(SHA256_Transform,_SHA256_Transform)

__weak_alias(SHA384_Init,_SHA384_Init) 
__weak_alias(SHA384_Update,_SHA384_Update)
__weak_alias(SHA384_Final,_SHA384_Final)
__weak_alias(SHA384_Transform,_SHA384_Transform)

__weak_alias(SHA512_Init,_SHA512_Init) 
__weak_alias(SHA512_Update,_SHA512_Update)
__weak_alias(SHA512_Final,_SHA512_Final)
__weak_alias(SHA512_Transform,_SHA512_Transform)
#endif
#endif

/*** SHA-256: *********************************************************/
int
SHA256_Init(SHA256_CTX *context)
{
        if (context == NULL)
                return 1;

        memcpy(context->state, sha256_initial_hash_value,
            (size_t)(SHA256_DIGEST_LENGTH));
        memset(context->buffer, 0, (size_t)(SHA256_BLOCK_LENGTH));
        context->bitcount = 0;

        return 1;
}

#ifdef SHA2_UNROLL_TRANSFORM

/* Unrolled SHA-256 round macros: */

#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h)       \
        W256[j] = be32dec(data);                \
        ++data;                                 \
        T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
             K256[j] + W256[j]; \
        (d) += T1; \
        (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
        j++

#define ROUND256(a,b,c,d,e,f,g,h)       \
        s0 = W256[(j+1)&0x0f]; \
        s0 = sigma0_256(s0); \
        s1 = W256[(j+14)&0x0f]; \
        s1 = sigma1_256(s1); \
        T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[j] + \
             (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0); \
        (d) += T1; \
        (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
        j++

void 
SHA256_Transform(SHA256_CTX *context, const uint32_t *data)
{
        uint32_t        a, b, c, d, e, f, g, h, s0, s1;
        uint32_t        T1, *W256;
        int             j;

        W256 = (uint32_t *)context->buffer;

        /* 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 {
                /* Rounds 0 to 15 (unrolled): */
                ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
                ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
                ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
                ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
                ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
                ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
                ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
                ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
        } while (j < 16);

        /* Now for the remaining rounds to 64: */
        do {
                ROUND256(a,b,c,d,e,f,g,h);
                ROUND256(h,a,b,c,d,e,f,g);
                ROUND256(g,h,a,b,c,d,e,f);
                ROUND256(f,g,h,a,b,c,d,e);
                ROUND256(e,f,g,h,a,b,c,d);
                ROUND256(d,e,f,g,h,a,b,c);
                ROUND256(c,d,e,f,g,h,a,b);
                ROUND256(b,c,d,e,f,g,h,a);
        } while (j < 64);

        /* 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
SHA256_Transform(SHA256_CTX *context, const uint32_t *data)
{
        uint32_t        a, b, c, d, e, f, g, h, s0, s1;
        uint32_t        T1, T2, *W256;
        int             j;

        W256 = (uint32_t *)(void *)context->buffer;

        /* 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 {
                W256[j] = be32dec(data);
                ++data;
                /* Apply the SHA-256 compression function to update a..h */
                T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
                T2 = Sigma0_256(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 = W256[(j+1)&0x0f];
                s0 = sigma0_256(s0);
                s1 = W256[(j+14)&0x0f];
                s1 = sigma1_256(s1);

                /* Apply the SHA-256 compression function to update a..h */
                T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
                     (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
                T2 = Sigma0_256(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 < 64);

        /* 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 */

int
SHA256_Update(SHA256_CTX *context, const uint8_t *data, size_t len)
{
        unsigned int    freespace, usedspace;

        if (len == 0) {
                /* Calling with no data is valid - we do nothing */
                return 1;
        }

        usedspace = (unsigned int)((context->bitcount >> 3) %
                                    SHA256_BLOCK_LENGTH);
        if (usedspace > 0) {
                /* Calculate how much free space is available in the buffer */
                freespace = SHA256_BLOCK_LENGTH - usedspace;

                if (len >= freespace) {
                        /* Fill the buffer completely and process it */
                        memcpy(&context->buffer[usedspace], data,
                            (size_t)(freespace));
                        context->bitcount += freespace << 3;
                        len -= freespace;
                        data += freespace;
                        SHA256_Transform(context,
                            (uint32_t *)(void *)context->buffer);
                } else {
                        /* The buffer is not yet full */
                        memcpy(&context->buffer[usedspace], data, len);
                        context->bitcount += len << 3;
                        /* Clean up: */
                        usedspace = freespace = 0;
                        return 1;
                }
        }
        /*
         * Process as many complete blocks as possible.
         *
         * Check alignment of the data pointer. If it is 32bit aligned,
         * SHA256_Transform can be called directly on the data stream,
         * otherwise enforce the alignment by copy into the buffer.
         */
        if ((uintptr_t)data % 4 == 0) {
                while (len >= SHA256_BLOCK_LENGTH) {
                        SHA256_Transform(context,
                            (const uint32_t *)(const void *)data);
                        context->bitcount += SHA256_BLOCK_LENGTH << 3;
                        len -= SHA256_BLOCK_LENGTH;
                        data += SHA256_BLOCK_LENGTH;
                }
        } else {
                while (len >= SHA256_BLOCK_LENGTH) {
                        memcpy(context->buffer, data, SHA256_BLOCK_LENGTH);
                        SHA256_Transform(context,
                            (const uint32_t *)(const void *)context->buffer);
                        context->bitcount += SHA256_BLOCK_LENGTH << 3;
                        len -= SHA256_BLOCK_LENGTH;
                        data += SHA256_BLOCK_LENGTH;
                }
        }
        if (len > 0) {
                /* There's left-overs, so save 'em */
                memcpy(context->buffer, data, len);
                context->bitcount += len << 3;
        }
        /* Clean up: */
        usedspace = freespace = 0;

        return 1;
}

static int
SHA224_256_Final(uint8_t digest[], SHA256_CTX *context, size_t len)
{
        unsigned int    usedspace;
        size_t i;

        /* If no digest buffer is passed, we don't bother doing this: */
        if (digest != NULL) {
                usedspace = (unsigned int)((context->bitcount >> 3) %
                    SHA256_BLOCK_LENGTH);
                context->bitcount = htobe64(context->bitcount);
                if (usedspace > 0) {
                        /* Begin padding with a 1 bit: */
                        context->buffer[usedspace++] = 0x80;

                        if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
                                /* Set-up for the last transform: */
                                memset(&context->buffer[usedspace], 0,
                                    (size_t)(SHA256_SHORT_BLOCK_LENGTH -
                                    usedspace));
                        } else {
                                if (usedspace < SHA256_BLOCK_LENGTH) {
                                        memset(&context->buffer[usedspace], 0,
                                            (size_t)(SHA256_BLOCK_LENGTH -
                                            usedspace));
                                }
                                /* Do second-to-last transform: */
                                SHA256_Transform(context,
                                    (uint32_t *)(void *)context->buffer);

                                /* And set-up for the last transform: */
                                memset(context->buffer, 0,
                                    (size_t)(SHA256_SHORT_BLOCK_LENGTH));
                        }
                } else {
                        /* Set-up for the last transform: */
                        memset(context->buffer, 0,
                            (size_t)(SHA256_SHORT_BLOCK_LENGTH));

                        /* Begin padding with a 1 bit: */
                        *context->buffer = 0x80;
                }
                /* Set the bit count: */
                memcpy(&context->buffer[SHA256_SHORT_BLOCK_LENGTH],
                    &context->bitcount, sizeof(context->bitcount));

                /* Final transform: */
                SHA256_Transform(context, (uint32_t *)(void *)context->buffer);

                for (i = 0; i < len / 4; i++)
                        be32enc(digest + 4 * i, context->state[i]);
        }

        /* Clean up state data: */
        memset(context, 0, sizeof(*context));
        usedspace = 0;

        return 1;
}

int
SHA256_Final(uint8_t digest[SHA256_DIGEST_LENGTH], SHA256_CTX *context)
{
        return SHA224_256_Final(digest, context, SHA256_DIGEST_LENGTH);
}

/*** SHA-224: *********************************************************/
int 
SHA224_Init(SHA224_CTX *context)
{
        if (context == NULL)
                return 1;

        /* The state and buffer size are driven by SHA256, not by SHA224. */
        memcpy(context->state, sha224_initial_hash_value,
            (size_t)(SHA256_DIGEST_LENGTH));
        memset(context->buffer, 0, (size_t)(SHA256_BLOCK_LENGTH));
        context->bitcount = 0;

        return 1;
}

int
SHA224_Update(SHA224_CTX *context, const uint8_t *data, size_t len)
{
        return SHA256_Update((SHA256_CTX *)context, data, len);
}

void
SHA224_Transform(SHA224_CTX *context, const uint32_t *data)
{
        SHA256_Transform((SHA256_CTX *)context, data);
}

int
SHA224_Final(uint8_t digest[SHA224_DIGEST_LENGTH], SHA224_CTX *context)
{
        return SHA224_256_Final(digest, (SHA256_CTX *)context,
            SHA224_DIGEST_LENGTH);
}

/*** SHA-512: *********************************************************/
int
SHA512_Init(SHA512_CTX *context)
{
        if (context == NULL)
                return 1;

        memcpy(context->state, sha512_initial_hash_value,
            (size_t)(SHA512_DIGEST_LENGTH));
        memset(context->buffer, 0, (size_t)(SHA512_BLOCK_LENGTH));
        context->bitcount[0] = context->bitcount[1] =  0;

        return 1;
}

#ifdef SHA2_UNROLL_TRANSFORM

/* Unrolled SHA-512 round macros: */
#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h)       \
        W512[j] = be64dec(data);                \
        ++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 uint64_t *data)
{
        uint64_t        a, b, c, d, e, f, g, h, s0, s1;
        uint64_t        T1, *W512 = (uint64_t *)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 uint64_t *data)
{
        uint64_t        a, b, c, d, e, f, g, h, s0, s1;
        uint64_t        T1, T2, *W512 = (void *)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 {
                W512[j] = be64dec(data);
                ++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 */

int
SHA512_Update(SHA512_CTX *context, const uint8_t *data, size_t len)
{
        unsigned int    freespace, usedspace;

        if (len == 0) {
                /* Calling with no data is valid - we do nothing */
                return 1;
        }

        usedspace = (unsigned int)((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(&context->buffer[usedspace], data,
                            (size_t)(freespace));
                        ADDINC128(context->bitcount, freespace << 3);
                        len -= freespace;
                        data += freespace;
                        SHA512_Transform(context,
                            (uint64_t *)(void *)context->buffer);
                } else {
                        /* The buffer is not yet full */
                        memcpy(&context->buffer[usedspace], data, len);
                        ADDINC128(context->bitcount, len << 3);
                        /* Clean up: */
                        usedspace = freespace = 0;
                        return 1;
                }
        }
        /*
         * Process as many complete blocks as possible.
         *
         * Check alignment of the data pointer. If it is 64bit aligned,
         * SHA512_Transform can be called directly on the data stream,
         * otherwise enforce the alignment by copy into the buffer.
         */
        if ((uintptr_t)data % 8 == 0) {
                while (len >= SHA512_BLOCK_LENGTH) {
                        SHA512_Transform(context,
                            (const uint64_t*)(const void *)data);
                        ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
                        len -= SHA512_BLOCK_LENGTH;
                        data += SHA512_BLOCK_LENGTH;
                }
        } else {
                while (len >= SHA512_BLOCK_LENGTH) {
                        memcpy(context->buffer, data, SHA512_BLOCK_LENGTH);
                        SHA512_Transform(context,
                            (const void *)context->buffer);
                        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(context->buffer, data, len);
                ADDINC128(context->bitcount, len << 3);
        }
        /* Clean up: */
        usedspace = freespace = 0;

        return 1;
}

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

        usedspace = (unsigned int)((context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH);
        context->bitcount[0] = htobe64(context->bitcount[0]);
        context->bitcount[1] = htobe64(context->bitcount[1]);
        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: */
                        memset(&context->buffer[usedspace], 0,
                            (size_t)(SHA512_SHORT_BLOCK_LENGTH - usedspace));
                } else {
                        if (usedspace < SHA512_BLOCK_LENGTH) {
                                memset(&context->buffer[usedspace], 0,
                                    (size_t)(SHA512_BLOCK_LENGTH - usedspace));
                        }
                        /* Do second-to-last transform: */
                        SHA512_Transform(context,
                            (uint64_t *)(void *)context->buffer);

                        /* And set-up for the last transform: */
                        memset(context->buffer, 0,
                            (size_t)(SHA512_BLOCK_LENGTH - 2));
                }
        } else {
                /* Prepare for final transform: */
                memset(context->buffer, 0, (size_t)(SHA512_SHORT_BLOCK_LENGTH));

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

        /* Final transform: */
        SHA512_Transform(context, (uint64_t *)(void *)context->buffer);
}

int
SHA512_Final(uint8_t digest[SHA512_DIGEST_LENGTH], SHA512_CTX *context)
{
        size_t i;

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

                /* Save the hash data for output: */
                for (i = 0; i < 8; ++i)
                        be64enc(digest + 8 * i, context->state[i]);
        }

        /* Zero out state data */
        memset(context, 0, sizeof(*context));

        return 1;
}

/*** SHA-384: *********************************************************/
int
SHA384_Init(SHA384_CTX *context)
{
        if (context == NULL)
                return 1;

        memcpy(context->state, sha384_initial_hash_value,
            (size_t)(SHA512_DIGEST_LENGTH));
        memset(context->buffer, 0, (size_t)(SHA384_BLOCK_LENGTH));
        context->bitcount[0] = context->bitcount[1] = 0;

        return 1;
}

int
SHA384_Update(SHA384_CTX *context, const uint8_t *data, size_t len)
{
        return SHA512_Update((SHA512_CTX *)context, data, len);
}

void
SHA384_Transform(SHA512_CTX *context, const uint64_t *data)
{
        SHA512_Transform((SHA512_CTX *)context, data);
}

int
SHA384_Final(uint8_t digest[SHA384_DIGEST_LENGTH], SHA384_CTX *context)
{
        size_t i;

        /* 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: */
                for (i = 0; i < 6; ++i)
                        be64enc(digest + 8 * i, context->state[i]);
        }

        /* Zero out state data */
        memset(context, 0, sizeof(*context));

        return 1;
}