crypto/sha512_generic.c - kernel/msm-4.9 - Gitiles

 /* SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
  *
  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
  *
  * 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, or (at your option) any
  * later version.
  *
  */
 #include <crypto/internal/hash.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/crypto.h>
 #include <linux/types.h>
 #include <crypto/sha.h>
 #include <linux/percpu.h>
 #include <asm/byteorder.h>

 struct sha512_ctx {
 	u64 state[8];
 	u32 count[4];
 	u8 buf[128];
 };

 static DEFINE_PER_CPU(u64[80], msg_schedule);

 static inline u64 Ch(u64 x, u64 y, u64 z)
 {
         return z ^ (x & (y ^ z));
 }

 static inline u64 Maj(u64 x, u64 y, u64 z)
 {
         return (x & y) | (z & (x | y));
 }

 static inline u64 RORu64(u64 x, u64 y)
 {
         return (x >> y) | (x << (64 - y));
 }

 static const u64 sha512_K[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 e0(x)       (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
 #define e1(x)       (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
 #define s0(x)       (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
 #define s1(x)       (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))

 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
 {
 	W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
 }

 static inline void BLEND_OP(int I, u64 *W)
 {
 	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 }

 static void
 sha512_transform(u64 *state, const u8 *input)
 {
 	u64 a, b, c, d, e, f, g, h, t1, t2;

 	int i;
 	u64 *W = get_cpu_var(msg_schedule);

 	/* load the input */
         for (i = 0; i < 16; i++)
                 LOAD_OP(i, W, input);

         for (i = 16; i < 80; i++) {
                 BLEND_OP(i, W);
         }

 	/* load the state into our registers */
 	a=state[0];   b=state[1];   c=state[2];   d=state[3];
 	e=state[4];   f=state[5];   g=state[6];   h=state[7];

 	/* now iterate */
 	for (i=0; i<80; i+=8) {
 		t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[i  ];
 		t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 		t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
 		t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 		t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
 		t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 		t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
 		t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 		t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
 		t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 		t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
 		t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 		t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
 		t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 		t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
 		t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 	}

 	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 	state[4] += e; state[5] += f; state[6] += g; state[7] += h;

 	/* erase our data */
 	a = b = c = d = e = f = g = h = t1 = t2 = 0;
 	memset(W, 0, sizeof(__get_cpu_var(msg_schedule)));
 	put_cpu_var(msg_schedule);
 }

 static int
 sha512_init(struct shash_desc *desc)
 {
 	struct sha512_ctx *sctx = shash_desc_ctx(desc);
 	sctx->state[0] = SHA512_H0;
 	sctx->state[1] = SHA512_H1;
 	sctx->state[2] = SHA512_H2;
 	sctx->state[3] = SHA512_H3;
 	sctx->state[4] = SHA512_H4;
 	sctx->state[5] = SHA512_H5;
 	sctx->state[6] = SHA512_H6;
 	sctx->state[7] = SHA512_H7;
 	sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;

 	return 0;
 }

 static int
 sha384_init(struct shash_desc *desc)
 {
 	struct sha512_ctx *sctx = shash_desc_ctx(desc);
 	sctx->state[0] = SHA384_H0;
 	sctx->state[1] = SHA384_H1;
 	sctx->state[2] = SHA384_H2;
 	sctx->state[3] = SHA384_H3;
 	sctx->state[4] = SHA384_H4;
 	sctx->state[5] = SHA384_H5;
 	sctx->state[6] = SHA384_H6;
 	sctx->state[7] = SHA384_H7;
         sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;

 	return 0;
 }

 static int
 sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 {
 	struct sha512_ctx *sctx = shash_desc_ctx(desc);

 	unsigned int i, index, part_len;

 	/* Compute number of bytes mod 128 */
 	index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);

 	/* Update number of bits */
 	if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 		if ((sctx->count[1] += 1) < 1)
 			if ((sctx->count[2] += 1) < 1)
 				sctx->count[3]++;
 		sctx->count[1] += (len >> 29);
 	}

         part_len = 128 - index;

 	/* Transform as many times as possible. */
 	if (len >= part_len) {
 		memcpy(&sctx->buf[index], data, part_len);
 		sha512_transform(sctx->state, sctx->buf);

 		for (i = part_len; i + 127 < len; i+=128)
 			sha512_transform(sctx->state, &data[i]);

 		index = 0;
 	} else {
 		i = 0;
 	}

 	/* Buffer remaining input */
 	memcpy(&sctx->buf[index], &data[i], len - i);

 	return 0;
 }

 static int
 sha512_final(struct shash_desc *desc, u8 *hash)
 {
 	struct sha512_ctx *sctx = shash_desc_ctx(desc);
         static u8 padding[128] = { 0x80, };
 	__be64 *dst = (__be64 *)hash;
 	__be32 bits[4];
 	unsigned int index, pad_len;
 	int i;

 	/* Save number of bits */
 	bits[3] = cpu_to_be32(sctx->count[0]);
 	bits[2] = cpu_to_be32(sctx->count[1]);
 	bits[1] = cpu_to_be32(sctx->count[2]);
 	bits[0] = cpu_to_be32(sctx->count[3]);

 	/* Pad out to 112 mod 128. */
 	index = (sctx->count[0] >> 3) & 0x7f;
 	pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 	sha512_update(desc, padding, pad_len);

 	/* Append length (before padding) */
 	sha512_update(desc, (const u8 *)bits, sizeof(bits));

 	/* Store state in digest */
 	for (i = 0; i < 8; i++)
 		dst[i] = cpu_to_be64(sctx->state[i]);

 	/* Zeroize sensitive information. */
 	memset(sctx, 0, sizeof(struct sha512_ctx));

 	return 0;
 }

 static int sha384_final(struct shash_desc *desc, u8 *hash)
 {
 	u8 D[64];

 	sha512_final(desc, D);

 	memcpy(hash, D, 48);
 	memset(D, 0, 64);

 	return 0;
 }

 static struct shash_alg sha512 = {
 	.digestsize	=	SHA512_DIGEST_SIZE,
 	.init		=	sha512_init,
 	.update		=	sha512_update,
 	.final		=	sha512_final,
 	.descsize	=	sizeof(struct sha512_ctx),
 	.base		=	{
 		.cra_name	=	"sha512",
 		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize	=	SHA512_BLOCK_SIZE,
 		.cra_module	=	THIS_MODULE,
 	}
 };

 static struct shash_alg sha384 = {
 	.digestsize	=	SHA384_DIGEST_SIZE,
 	.init		=	sha384_init,
 	.update		=	sha512_update,
 	.final		=	sha384_final,
 	.descsize	=	sizeof(struct sha512_ctx),
 	.base		=	{
 		.cra_name	=	"sha384",
 		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize	=	SHA384_BLOCK_SIZE,
 		.cra_module	=	THIS_MODULE,
 	}
 };

 static int __init sha512_generic_mod_init(void)
 {
         int ret = 0;

         if ((ret = crypto_register_shash(&sha384)) < 0)
                 goto out;
         if ((ret = crypto_register_shash(&sha512)) < 0)
                 crypto_unregister_shash(&sha384);
 out:
         return ret;
 }

 static void __exit sha512_generic_mod_fini(void)
 {
         crypto_unregister_shash(&sha384);
         crypto_unregister_shash(&sha512);
 }

 module_init(sha512_generic_mod_init);
 module_exit(sha512_generic_mod_fini);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");

 MODULE_ALIAS("sha384");
 MODULE_ALIAS("sha512");
	/* SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
	*
	* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
	* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
	* Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
	*
	* 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, or (at your option) any
	* later version.
	*
	*/
	#include <crypto/internal/hash.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/init.h>
	#include <linux/crypto.h>
	#include <linux/types.h>
	#include <crypto/sha.h>
	#include <linux/percpu.h>
	#include <asm/byteorder.h>

	struct sha512_ctx {
	u64 state[8];
	u32 count[4];
	u8 buf[128];
	};

	static DEFINE_PER_CPU(u64[80], msg_schedule);

	static inline u64 Ch(u64 x, u64 y, u64 z)
	{
	return z ^ (x & (y ^ z));
	}

	static inline u64 Maj(u64 x, u64 y, u64 z)
	{
	return (x & y) \| (z & (x \| y));
	}

	static inline u64 RORu64(u64 x, u64 y)
	{
	return (x >> y) \| (x << (64 - y));
	}

	static const u64 sha512_K[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 e0(x) (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
	#define e1(x) (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
	#define s0(x) (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
	#define s1(x) (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))

	static inline void LOAD_OP(int I, u64 W, const u8 input)
	{
	W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
	}

	static inline void BLEND_OP(int I, u64 *W)
	{
	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
	}

	static void
	sha512_transform(u64 state, const u8 input)
	{
	u64 a, b, c, d, e, f, g, h, t1, t2;

	int i;
	u64 *W = get_cpu_var(msg_schedule);

	/* load the input */
	for (i = 0; i < 16; i++)
	LOAD_OP(i, W, input);

	for (i = 16; i < 80; i++) {
	BLEND_OP(i, W);
	}

	/* load the state into our registers */
	a=state[0]; b=state[1]; c=state[2]; d=state[3];
	e=state[4]; f=state[5]; g=state[6]; h=state[7];

	/* now iterate */
	for (i=0; i<80; i+=8) {
	t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i ] + W[i ];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
	}

	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
	state[4] += e; state[5] += f; state[6] += g; state[7] += h;

	/* erase our data */
	a = b = c = d = e = f = g = h = t1 = t2 = 0;
	memset(W, 0, sizeof(__get_cpu_var(msg_schedule)));
	put_cpu_var(msg_schedule);
	}

	static int
	sha512_init(struct shash_desc *desc)
	{
	struct sha512_ctx *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA512_H0;
	sctx->state[1] = SHA512_H1;
	sctx->state[2] = SHA512_H2;
	sctx->state[3] = SHA512_H3;
	sctx->state[4] = SHA512_H4;
	sctx->state[5] = SHA512_H5;
	sctx->state[6] = SHA512_H6;
	sctx->state[7] = SHA512_H7;
	sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;

	return 0;
	}

	static int
	sha384_init(struct shash_desc *desc)
	{
	struct sha512_ctx *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA384_H0;
	sctx->state[1] = SHA384_H1;
	sctx->state[2] = SHA384_H2;
	sctx->state[3] = SHA384_H3;
	sctx->state[4] = SHA384_H4;
	sctx->state[5] = SHA384_H5;
	sctx->state[6] = SHA384_H6;
	sctx->state[7] = SHA384_H7;
	sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;

	return 0;
	}

	static int
	sha512_update(struct shash_desc desc, const u8 data, unsigned int len)
	{
	struct sha512_ctx *sctx = shash_desc_ctx(desc);

	unsigned int i, index, part_len;

	/* Compute number of bytes mod 128 */
	index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);

	/* Update number of bits */
	if ((sctx->count[0] += (len << 3)) < (len << 3)) {
	if ((sctx->count[1] += 1) < 1)
	if ((sctx->count[2] += 1) < 1)
	sctx->count[3]++;
	sctx->count[1] += (len >> 29);
	}

	part_len = 128 - index;

	/* Transform as many times as possible. */
	if (len >= part_len) {
	memcpy(&sctx->buf[index], data, part_len);
	sha512_transform(sctx->state, sctx->buf);

	for (i = part_len; i + 127 < len; i+=128)
	sha512_transform(sctx->state, &data[i]);

	index = 0;
	} else {
	i = 0;
	}

	/* Buffer remaining input */
	memcpy(&sctx->buf[index], &data[i], len - i);

	return 0;
	}

	static int
	sha512_final(struct shash_desc desc, u8 hash)
	{
	struct sha512_ctx *sctx = shash_desc_ctx(desc);
	static u8 padding[128] = { 0x80, };
	__be64 dst = (__be64 )hash;
	__be32 bits[4];
	unsigned int index, pad_len;
	int i;

	/* Save number of bits */
	bits[3] = cpu_to_be32(sctx->count[0]);
	bits[2] = cpu_to_be32(sctx->count[1]);
	bits[1] = cpu_to_be32(sctx->count[2]);
	bits[0] = cpu_to_be32(sctx->count[3]);

	/* Pad out to 112 mod 128. */
	index = (sctx->count[0] >> 3) & 0x7f;
	pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
	sha512_update(desc, padding, pad_len);

	/* Append length (before padding) */
	sha512_update(desc, (const u8 *)bits, sizeof(bits));

	/* Store state in digest */
	for (i = 0; i < 8; i++)
	dst[i] = cpu_to_be64(sctx->state[i]);

	/* Zeroize sensitive information. */
	memset(sctx, 0, sizeof(struct sha512_ctx));

	return 0;
	}

	static int sha384_final(struct shash_desc desc, u8 hash)
	{
	u8 D[64];

	sha512_final(desc, D);

	memcpy(hash, D, 48);
	memset(D, 0, 64);

	return 0;
	}

	static struct shash_alg sha512 = {
	.digestsize = SHA512_DIGEST_SIZE,
	.init = sha512_init,
	.update = sha512_update,
	.final = sha512_final,
	.descsize = sizeof(struct sha512_ctx),
	.base = {
	.cra_name = "sha512",
	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	.cra_blocksize = SHA512_BLOCK_SIZE,
	.cra_module = THIS_MODULE,
	}
	};

	static struct shash_alg sha384 = {
	.digestsize = SHA384_DIGEST_SIZE,
	.init = sha384_init,
	.update = sha512_update,
	.final = sha384_final,
	.descsize = sizeof(struct sha512_ctx),
	.base = {
	.cra_name = "sha384",
	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	.cra_blocksize = SHA384_BLOCK_SIZE,
	.cra_module = THIS_MODULE,
	}
	};

	static int __init sha512_generic_mod_init(void)
	{
	int ret = 0;

	if ((ret = crypto_register_shash(&sha384)) < 0)
	goto out;
	if ((ret = crypto_register_shash(&sha512)) < 0)
	crypto_unregister_shash(&sha384);
	out:
	return ret;
	}

	static void __exit sha512_generic_mod_fini(void)
	{
	crypto_unregister_shash(&sha384);
	crypto_unregister_shash(&sha512);
	}

	module_init(sha512_generic_mod_init);
	module_exit(sha512_generic_mod_fini);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");

	MODULE_ALIAS("sha384");
	MODULE_ALIAS("sha512");