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/*
 *  FIPS-180-2 compliant SHA-384/512 implementation
 *
 *  Copyright (C) 2006-2007  Christophe Devine
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
/*
 *  The SHA-512 Secure Hash Standard was published by NIST in 2002.
 *
 *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
 */

#include <common.h>
#include <digest.h>
#include <init.h>
#include <linux/string.h>
#include <asm/byteorder.h>
#include <crypto/internal.h>

#define SHA384_SUM_LEN	48
#define SHA512_SUM_LEN	64

typedef struct {
	uint64_t total[2];
	uint64_t state[8];
	uint8_t buffer[128];
	int is384;
} sha4_context;

/*
 * 64-bit integer manipulation macros (big endian)
 */

#define GET_UINT64_BE(n,b,i) (n) = be64_to_cpu(((uint64_t*)(b))[i / 8])
#define PUT_UINT64_BE(n,b,i) ((uint64_t*)(b))[i / 8] = cpu_to_be64(n)

/*
 * Round constants
 */
static const uint64_t K[80] = {
	0x428A2F98D728AE22, 0x7137449123EF65CD,
	0xB5C0FBCFEC4D3B2F, 0xE9B5DBA58189DBBC,
	0x3956C25BF348B538, 0x59F111F1B605D019,
	0x923F82A4AF194F9B, 0xAB1C5ED5DA6D8118,
	0xD807AA98A3030242, 0x12835B0145706FBE,
	0x243185BE4EE4B28C, 0x550C7DC3D5FFB4E2,
	0x72BE5D74F27B896F, 0x80DEB1FE3B1696B1,
	0x9BDC06A725C71235, 0xC19BF174CF692694,
	0xE49B69C19EF14AD2, 0xEFBE4786384F25E3,
	0x0FC19DC68B8CD5B5, 0x240CA1CC77AC9C65,
	0x2DE92C6F592B0275, 0x4A7484AA6EA6E483,
	0x5CB0A9DCBD41FBD4, 0x76F988DA831153B5,
	0x983E5152EE66DFAB, 0xA831C66D2DB43210,
	0xB00327C898FB213F, 0xBF597FC7BEEF0EE4,
	0xC6E00BF33DA88FC2, 0xD5A79147930AA725,
	0x06CA6351E003826F, 0x142929670A0E6E70,
	0x27B70A8546D22FFC, 0x2E1B21385C26C926,
	0x4D2C6DFC5AC42AED, 0x53380D139D95B3DF,
	0x650A73548BAF63DE, 0x766A0ABB3C77B2A8,
	0x81C2C92E47EDAEE6, 0x92722C851482353B,
	0xA2BFE8A14CF10364, 0xA81A664BBC423001,
	0xC24B8B70D0F89791, 0xC76C51A30654BE30,
	0xD192E819D6EF5218, 0xD69906245565A910,
	0xF40E35855771202A, 0x106AA07032BBD1B8,
	0x19A4C116B8D2D0C8, 0x1E376C085141AB53,
	0x2748774CDF8EEB99, 0x34B0BCB5E19B48A8,
	0x391C0CB3C5C95A63, 0x4ED8AA4AE3418ACB,
	0x5B9CCA4F7763E373, 0x682E6FF3D6B2B8A3,
	0x748F82EE5DEFB2FC, 0x78A5636F43172F60,
	0x84C87814A1F0AB72, 0x8CC702081A6439EC,
	0x90BEFFFA23631E28, 0xA4506CEBDE82BDE9,
	0xBEF9A3F7B2C67915, 0xC67178F2E372532B,
	0xCA273ECEEA26619C, 0xD186B8C721C0C207,
	0xEADA7DD6CDE0EB1E, 0xF57D4F7FEE6ED178,
	0x06F067AA72176FBA, 0x0A637DC5A2C898A6,
	0x113F9804BEF90DAE, 0x1B710B35131C471B,
	0x28DB77F523047D84, 0x32CAAB7B40C72493,
	0x3C9EBE0A15C9BEBC, 0x431D67C49C100D4C,
	0x4CC5D4BECB3E42B6, 0x597F299CFC657E2A,
	0x5FCB6FAB3AD6FAEC, 0x6C44198C4A475817
};

/*
 * SHA-512 context setup
 */
static void sha4_starts(sha4_context *ctx, int is384)
{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	if (is384 == 0 && IS_ENABLED(CONFIG_SHA512)) {
		/* SHA-512 */
		ctx->state[0] = 0x6A09E667F3BCC908;
		ctx->state[1] = 0xBB67AE8584CAA73B;
		ctx->state[2] = 0x3C6EF372FE94F82B;
		ctx->state[3] = 0xA54FF53A5F1D36F1;
		ctx->state[4] = 0x510E527FADE682D1;
		ctx->state[5] = 0x9B05688C2B3E6C1F;
		ctx->state[6] = 0x1F83D9ABFB41BD6B;
		ctx->state[7] = 0x5BE0CD19137E2179;
	} else if (IS_ENABLED(CONFIG_SHA384)) {
		/* SHA-384 */
		ctx->state[0] = 0xCBBB9D5DC1059ED8;
		ctx->state[1] = 0x629A292A367CD507;
		ctx->state[2] = 0x9159015A3070DD17;
		ctx->state[3] = 0x152FECD8F70E5939;
		ctx->state[4] = 0x67332667FFC00B31;
		ctx->state[5] = 0x8EB44A8768581511;
		ctx->state[6] = 0xDB0C2E0D64F98FA7;
		ctx->state[7] = 0x47B5481DBEFA4FA4;
	}

	ctx->is384 = is384;
}

static void sha4_process(sha4_context *ctx, unsigned char data[128])
{
	int i;
	uint64_t temp1, temp2, W[80];
	uint64_t A, B, C, D, E, F, G, H;

#define  SHR(x,n) (x >> n)
#define ROTR(x,n) (SHR(x,n) | (x << (64 - n)))

#define S0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^  SHR(x, 7))
#define S1(x) (ROTR(x,19) ^ ROTR(x,61) ^  SHR(x, 6))

#define S2(x) (ROTR(x,28) ^ ROTR(x,34) ^ ROTR(x,39))
#define S3(x) (ROTR(x,14) ^ ROTR(x,18) ^ ROTR(x,41))

#define F0(x,y,z) ((x & y) | (z & (x | y)))
#define F1(x,y,z) (z ^ (x & (y ^ z)))

#define P(a,b,c,d,e,f,g,h,x,K)                  \
{                                               \
    temp1 = h + S3(e) + F1(e,f,g) + K + x;      \
    temp2 = S2(a) + F0(a,b,c);                  \
    d += temp1; h = temp1 + temp2;              \
}

	for (i = 0; i < 16; i++) {
		GET_UINT64_BE(W[i], data, i << 3);
	}

	for (; i < 80; i++) {
		W[i] = S1(W[i - 2]) + W[i - 7] + S0(W[i - 15]) + W[i - 16];
	}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];
	E = ctx->state[4];
	F = ctx->state[5];
	G = ctx->state[6];
	H = ctx->state[7];
	i = 0;

	do {
		P(A, B, C, D, E, F, G, H, W[i], K[i]);
		i++;
		P(H, A, B, C, D, E, F, G, W[i], K[i]);
		i++;
		P(G, H, A, B, C, D, E, F, W[i], K[i]);
		i++;
		P(F, G, H, A, B, C, D, E, W[i], K[i]);
		i++;
		P(E, F, G, H, A, B, C, D, W[i], K[i]);
		i++;
		P(D, E, F, G, H, A, B, C, W[i], K[i]);
		i++;
		P(C, D, E, F, G, H, A, B, W[i], K[i]);
		i++;
		P(B, C, D, E, F, G, H, A, W[i], K[i]);
		i++;
	} while (i < 80);

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
	ctx->state[4] += E;
	ctx->state[5] += F;
	ctx->state[6] += G;
	ctx->state[7] += H;
}

/*
 * SHA-512 process buffer
 */
static void sha4_update(sha4_context *ctx, unsigned char *input, int ilen)
{
	int fill;
	uint64_t left;

	if (ilen <= 0)
		return;

	left = ctx->total[0] & 0x7F;
	fill = (int)(128 - left);

	ctx->total[0] += ilen;

	if (ctx->total[0] < (uint64_t)ilen)
		ctx->total[1]++;

	if (left && ilen >= fill) {
		memcpy((void *)(ctx->buffer + left), (void *)input, fill);
		sha4_process(ctx, ctx->buffer);
		input += fill;
		ilen -= fill;
		left = 0;
	}

	while (ilen >= 128) {
		sha4_process(ctx, input);
		input += 128;
		ilen -= 128;
	}

	if (ilen > 0)
		memcpy((void *)(ctx->buffer + left), (void *)input, ilen);
}

static const unsigned char sha4_padding[128] = {
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/*
 * SHA-512 final digest
 */
static void sha4_finish(sha4_context *ctx, unsigned char output[64])
{
	int last, padn;
	uint64_t high, low;
	unsigned char msglen[16];

	high = (ctx->total[0] >> 61)
	    | (ctx->total[1] << 3);
	low = (ctx->total[0] << 3);

	PUT_UINT64_BE(high, msglen, 0);
	PUT_UINT64_BE(low, msglen, 8);

	last = (int)(ctx->total[0] & 0x7F);
	padn = (last < 112) ? (112 - last) : (240 - last);

	sha4_update(ctx, (unsigned char *)sha4_padding, padn);
	sha4_update(ctx, msglen, 16);

	PUT_UINT64_BE(ctx->state[0], output, 0);
	PUT_UINT64_BE(ctx->state[1], output, 8);
	PUT_UINT64_BE(ctx->state[2], output, 16);
	PUT_UINT64_BE(ctx->state[3], output, 24);
	PUT_UINT64_BE(ctx->state[4], output, 32);
	PUT_UINT64_BE(ctx->state[5], output, 40);

	if (ctx->is384 == 0) {
		PUT_UINT64_BE(ctx->state[6], output, 48);
		PUT_UINT64_BE(ctx->state[7], output, 56);
	}
}

static int digest_sha4_update(struct digest *d, const void *data,
				unsigned long len)
{
	sha4_update(d->ctx, (uint8_t *)data, len);

	return 0;
}

static int digest_sha4_final(struct digest *d, unsigned char *md)
{
	sha4_finish(d->ctx, md);

	return 0;
}

static int digest_sha384_init(struct digest *d)
{
	sha4_starts(d->ctx, 1);

	return 0;
}

static struct digest_algo m384 = {
	.base = {
		.name		=	"sha384",
		.driver_name	=	"sha384-generic",
		.priority	=	0,
	},

	.init = digest_sha384_init,
	.update = digest_sha4_update,
	.final = digest_sha4_final,
	.verify = digest_generic_verify,
	.length = SHA384_SUM_LEN,
	.ctx_length = sizeof(sha4_context),
};


static int sha384_digest_register(void)
{
	if (!IS_ENABLED(CONFIG_SHA384))
		return 0;

	return digest_algo_register(&m384);
}
device_initcall(sha384_digest_register);

static int digest_sha512_init(struct digest *d)
{
	sha4_starts(d->ctx, 0);

	return 0;
}

static struct digest_algo m512 = {
	.base = {
		.name		=	"sha512",
		.driver_name	=	"sha512-generic",
		.priority	=	0,
	},

	.init = digest_sha512_init,
	.update = digest_sha4_update,
	.final = digest_sha4_final,
	.digest = digest_generic_digest,
	.verify = digest_generic_verify,
	.length = SHA512_SUM_LEN,
	.ctx_length = sizeof(sha4_context),
};

static int sha512_digest_register(void)
{
	if (!IS_ENABLED(CONFIG_SHA512))
		return 0;

	return digest_algo_register(&m512);
}
device_initcall(sha512_digest_register);