path: root/src/securerom/sha512.C

/* IBM_PROLOG_BEGIN_TAG                                                   */
/* This is an automatically generated prolog.                             */
/*                                                                        */
/* $Source: src/securerom/sha512.C $                                      */
/*                                                                        */
/* OpenPOWER HostBoot Project                                             */
/*                                                                        */
/* Contributors Listed Below - COPYRIGHT 2016,2017                        */
/* [+] International Business Machines Corp.                              */
/*                                                                        */
/*                                                                        */
/* Licensed under the Apache License, Version 2.0 (the "License");        */
/* you may not use this file except in compliance with the License.       */
/* You may obtain a copy of the License at                                */
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/*     http://www.apache.org/licenses/LICENSE-2.0                         */
/*                                                                        */
/* Unless required by applicable law or agreed to in writing, software    */
/* distributed under the License is distributed on an "AS IS" BASIS,      */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
/* implied. See the License for the specific language governing           */
/* permissions and limitations under the License.                         */
/*                                                                        */
/* IBM_PROLOG_END_TAG                                                     */
/********************************************************************
 * SHA-512  BIG-Endian Version
 *
 *******************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <sha512.h>


/* Initial hash value HASH(32byte) for SHA-512 */
const uint64_t sha512_initial_hash_value[8] = {
	0x6a09e667f3bcc908ULL,
	0xbb67ae8584caa73bULL,
	0x3c6ef372fe94f82bULL,
	0xa54ff53a5f1d36f1ULL,
	0x510e527fade682d1ULL,
	0x9b05688c2b3e6c1fULL,
	0x1f83d9abfb41bd6bULL,
	0x5be0cd19137e2179ULL
};

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



#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]++; \
	} \
}



/* Shift-right (used in SHA-512): */
#define R(b,x) 		((x) >> (b))


/* 64-bit Rotate-right (used in SHA-512): */
#define S64(b,x)	(((x) >> (b)) | ((x) << (64 - (b))))



/* Two of six logical functions used in 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-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)))

static void SHA512_Last(SHA512_CTX*);
static void SHA512_Transform(SHA512_CTX*, const uint64_t *);

/*
 * Constant used by SHA256/384/512_End() functions for converting the
 * digest to a readable hexadecimal character string:
 */

static inline void bcopy(const void * SRC, void* DST, size_t length){
    unsigned char * source = (unsigned char *) SRC;
    unsigned char * destination = (unsigned char *) DST;
    for( ; length ; length--){
        *destination++ = *source++;
    }
}
static inline void bzero(void * DST, size_t length){
    unsigned char * destination = (unsigned char *) DST;
    for( ; length ; length--){
        *destination++=0x00;
    }
}

// unused:
//static inline int tstrlen(const void * SRC){
//    unsigned char * source = (unsigned char *) SRC;
//    int length=0;
//    while(source[length]!=0x00){
//       length++;
//    }
//    return length;
//}


/*** SHA-512: *********************************************************/
asm(".globl .L.SHA512_Init");
void SHA512_Init(SHA512_CTX* context) {
	if (context == (SHA512_CTX*)0) {
		return;
	}

	uint64_t* sha512_initial_hash_value_p;
  #ifdef EMULATE_HW
	sha512_initial_hash_value_p = sha512_initial_hash_value;
  #else
	//selftest_p = &selftest;  //this line would introduce a absolute address in the toc
	asm volatile("li   %0,(__toc_start)@l  ### %0 := base+0x8000 \n\t" // because li does not work
		         "sub  %0,r2,%0 \n\t" // because subi does not work
	             "addi %0,%0,(sha512_initial_hash_value-0x8000)@l" : "=r" (sha512_initial_hash_value_p) );
  #endif

	bcopy(sha512_initial_hash_value_p, context->state, SHA512_DIGEST_LENGTH);
	bzero(context->buffer, SHA512_BLOCK_LENGTH);
	context->bitcount[0] = context->bitcount[1] =  0;
}


static 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 = (uint64_t*)context->buffer;
	int		j;

	uint64_t* K512_p;
  #ifdef EMULATE_HW
	K512_p = K512;
  #else
	//selftest_p = &selftest;  //this line would introduce a absolute address in the toc
	asm volatile("li   %0,(__toc_start)@l  ### %0 := base+0x8000 \n\t" // because li does not work
		         "sub  %0,r2,%0 \n\t" // because subi does not work
	             "addi %0,%0,(K512-0x8000)@l" : "=r" (K512_p) );
  #endif

	/* 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 {
		/* Apply the SHA-512 compression function to update a..h with copy */
		T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512_p[j] + (W512[j] = *data++);
		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_p[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;
}


asm(".globl .L.SHA512_Update");
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 */
			bcopy(data, &context->buffer[usedspace], freespace);
			ADDINC128(context->bitcount, freespace << 3);
			len -= freespace;
			data += freespace;
			SHA512_Transform(context, (uint64_t*)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 uint64_t*)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 (usedspace > 0) {
		/* Begin padding with a 1 bit: */
		context->buffer[usedspace++] = 0x80;

#if SHA512_FIX
		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_SHORT_BLOCK_LENGTH) {
			if (usedspace < SHA512_BLOCK_LENGTH) {
				bzero(&context->buffer[usedspace], SHA512_BLOCK_LENGTH - usedspace);
			}
			/* Do second-to-last transform: */
			SHA512_Transform(context, (uint64_t*)context->buffer);

			/* And set-up for the last transform: */
			bzero(context->buffer, SHA512_SHORT_BLOCK_LENGTH);
		}
#else
		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, (uint64_t*)context->buffer);

			/* And set-up for the last transform: */
			bzero(context->buffer, SHA512_BLOCK_LENGTH - 2);
		}
#endif
	} 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): */
	*(uint64_t*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
	*(uint64_t*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];

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

asm(".globl .L.SHA512_Final");
void SHA512_Final(SHA512_CTX* context, sha2_hash_t *result) {
	/* Sanity check: */
	//assert(context != (SHA512_CTX*)0);

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

	/* Save the hash data for output: */
	bcopy(context->state, result, SHA512_DIGEST_LENGTH);

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

asm(".globl .L.SHA512_Hash");
void SHA512_Hash(const sha2_byte* data, size_t len, sha2_hash_t *result) {
	SHA512_CTX	context;

	SHA512_Init(&context);
	SHA512_Update(&context, data, len);
	SHA512_Final(&context, result);
}

/*
int main( void ){
	int i;	
        uint64_t hash[8] = {};
	const sha2_byte text[]={"The quick brown fox jumps over the lazy dog"};

	printf("SHA512 \"%s\"\n",text);
	SHA512( text, tstrlen(text), hash );
	for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
		printf("%02x", hash[i]);
	        if( (i&3) ==3) printf(" ");
		if( (i&31) ==31) printf("\n");
	}
	
	const sha2_byte text2[]={""};
	printf("SHA512 \"%s\"\n",text2);
	SHA512( text2, tstrlen(text2), hash );
	for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
		printf("%02x", hash[i]);
	        if( (i&3) ==3) printf(" ");
		if( (i&31) ==31) printf("\n");
	}

}
*/

#if INCLUDE_SHA_TESTS
/****************************************************************************/
static uint8_t SHA512_Input[] = "abc";
static uint64_t SHA512_Result[] = {
  0xddaf35a193617abaull, 0xcc417349ae204131ull, 0x12e6fa4e89a97ea2ull, 0x0a9eeee64b55d39aull,
  0x2192992a274fc1a8ull, 0x36ba3c23a3feebbdull, 0x454d4423643ce80eull, 0x2a9ac94fa54ca49full,
};
static uint8_t SHA512_Input2[] =
  "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
  "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu";
static uint64_t SHA512_Result2[] = {
  0x8e959b75dae313daull, 0x8cf4f72814fc143full, 0x8f7779c6eb9f7fa1ull, 0x7299aeadb6889018ull,
  0x501d289e4900f7e4ull, 0x331b99dec4b5433aull, 0xc7d329eeb6dd2654ull, 0x5e96e55b874be909ull,
};
#include <selftest.h>
/****************************************************************************/
void SHA512_Test (void)
{
  SHA512 sha;
  SHA512_Init (&sha);
  SHA512_Update (&sha, SHA512_Input, 3);
  SHA512_Finish (&sha, NULL);
  if (memcmp((uint8_t*)sha.H, (uint8_t*)SHA512_Result, SHA512_DIGEST_SIZE)) {
    printf ("SHA512 Test 1 FAILED with bad digest (\n");
    printf ("%016llx %016llx %016llx %016llx\n",sha.H[0],sha.H[1],sha.H[2],sha.H[3]);
    printf ("%016llx %016llx %016llx %016llx\n",sha.H[4],sha.H[5],sha.H[6],sha.H[7]);
    printf (")\n");
  }
  else {
    printf ("SHA512 Test 1 Complete\n");
  }
  SHA512_Init (&sha);
  SHA512_Update (&sha, SHA512_Input2, 112);
  SHA512_Finish (&sha, NULL);
  if (memcmp((uint8_t*)sha.H, (uint8_t*)SHA512_Result2, SHA512_DIGEST_SIZE)) {
    printf ("SHA512 Test 2 FAILED with bad digest (\n");
    printf ("%016llx %016llx %016llx %016llx\n",sha.H[0],sha.H[1],sha.H[2],sha.H[3]);
    printf ("%016llx %016llx %016llx %016llx\n",sha.H[4],sha.H[5],sha.H[6],sha.H[7]);
    printf (")\n");
  }
  else {
    printf ("SHA512 Test 2 Complete\n");
  }
  SHA512_Hash (&sha, (uint8_t*)&selftest.ec, sizeof(selftest.ec), NULL);
  sha.H[0] = BE2HO_8(sha.H[0]);
  sha.H[1] = BE2HO_8(sha.H[1]);
  sha.H[2] = BE2HO_8(sha.H[2]);
  sha.H[3] = BE2HO_8(sha.H[3]);
  sha.H[4] = BE2HO_8(sha.H[4]);
  sha.H[5] = BE2HO_8(sha.H[5]);
  sha.H[6] = BE2HO_8(sha.H[6]);
  sha.H[7] = BE2HO_8(sha.H[7]);
  if (memcmp((uint8_t*)sha.H, selftest.sha.hash, SHA512_DIGEST_SIZE)) {
    printf ("SHA512 Test 3 FAILED with bad digest (\n");
    printf ("%016llx %016llx %016llx %016llx\n",sha.H[0],sha.H[1],sha.H[2],sha.H[3]);
    printf ("%016llx %016llx %016llx %016llx\n",sha.H[4],sha.H[5],sha.H[6],sha.H[7]);
    printf (")\n");
  }
  else {
    printf ("SHA512 Test 3 Complete\n");
  }
}
#endif