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/* 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 <linux/kernel.h>

#include <linux/module.h>

#include <linux/mm.h>

#include <linux/init.h>

#include <linux/crypto.h>

#include <asm/scatterlist.h>

#include <asm/byteorder.h>

#define SHA384_DIGEST_SIZE 48

#define SHA512_DIGEST_SIZE 64

#define SHA384_HMAC_BLOCK_SIZE  96

#define SHA512_HMAC_BLOCK_SIZE 128

struct sha512_ctx {

        u64 state[8];

        u32 count[4];

        u8 buf[128];

};

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));

}

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))

/* H* initial state for SHA-512 */

#define H0         0x6a09e667f3bcc908ULL

#define H1         0xbb67ae8584caa73bULL

#define H2         0x3c6ef372fe94f82bULL

#define H3         0xa54ff53a5f1d36f1ULL

#define H4         0x510e527fade682d1ULL

#define H5         0x9b05688c2b3e6c1fULL

#define H6         0x1f83d9abfb41bd6bULL

#define H7         0x5be0cd19137e2179ULL

/* H'* initial state for SHA-384 */

#define HP0 0xcbbb9d5dc1059ed8ULL

#define HP1 0x629a292a367cd507ULL

#define HP2 0x9159015a3070dd17ULL

#define HP3 0x152fecd8f70e5939ULL

#define HP4 0x67332667ffc00b31ULL

#define HP5 0x8eb44a8768581511ULL

#define HP6 0xdb0c2e0d64f98fa7ULL

#define HP7 0x47b5481dbefa4fa4ULL

static inline void LOAD_OP(int I, u64 *W, const u8 *input)

{

        u64 t1  = input[(8*I)  ] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+1] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+2] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+3] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+4] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+5] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+6] & 0xff;

        t1 <<= 8;

        t1 |= input[(8*I)+7] & 0xff;

        W[I] = t1;

}

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;

        u64 W[80];

        int i;

        /* 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, 80 * sizeof(u64));

}

static void

sha512_init(void *ctx)

{

        struct sha512_ctx *sctx = ctx;

        sctx->state[0] = H0;

        sctx->state[1] = H1;

        sctx->state[2] = H2;

        sctx->state[3] = H3;

        sctx->state[4] = H4;

        sctx->state[5] = H5;

        sctx->state[6] = H6;

        sctx->state[7] = H7;

        sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;

        memset(sctx->buf, 0, sizeof(sctx->buf));

}

static void

sha384_init(void *ctx)

{

        struct sha512_ctx *sctx = ctx;

        sctx->state[0] = HP0;

        sctx->state[1] = HP1;

        sctx->state[2] = HP2;

        sctx->state[3] = HP3;

        sctx->state[4] = HP4;

        sctx->state[5] = HP5;

        sctx->state[6] = HP6;

        sctx->state[7] = HP7;

        sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;

        memset(sctx->buf, 0, sizeof(sctx->buf));

}

static void

sha512_update(void *ctx, const u8 *data, unsigned int len)

{

        struct sha512_ctx *sctx = ctx;

        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);

}

static void

sha512_final(void *ctx, u8 *hash)

{

        struct sha512_ctx *sctx = ctx;

        static u8 padding[128] = { 0x80, };

        u32 t;

        u64 t2;

        u8 bits[128];

        unsigned int index, pad_len;

        int i, j;

        index = pad_len = t = i = j = 0;

        t2 = 0;

        /* Save number of bits */

        t = sctx->count[0];

        bits[15] = t; t>>=8;

        bits[14] = t; t>>=8;

        bits[13] = t; t>>=8;

        bits[12] = t;

        t = sctx->count[1];

        bits[11] = t; t>>=8;

        bits[10] = t; t>>=8;

        bits[9 ] = t; t>>=8;

        bits[8 ] = t;

        t = sctx->count[2];

        bits[7 ] = t; t>>=8;

        bits[6 ] = t; t>>=8;

        bits[5 ] = t; t>>=8;

        bits[4 ] = t;

        t = sctx->count[3];

        bits[3 ] = t; t>>=8;

        bits[2 ] = t; t>>=8;

        bits[1 ] = t; t>>=8;

        bits[0 ] = t;

        /* Pad out to 112 mod 128. */

        index = (sctx->count[0] >> 3) & 0x7f;

        pad_len = (index < 112) ? (112 - index) : ((128+112) - index);

        sha512_update(sctx, padding, pad_len);

        /* Append length (before padding) */

        sha512_update(sctx, bits, 16);

        /* Store state in digest */

        for (i = j = 0; i < 8; i++, j += 8) {

                t2 = sctx->state[i];

                hash[j+7] = (char)t2 & 0xff; t2>>=8;

                hash[j+6] = (char)t2 & 0xff; t2>>=8;

                hash[j+5] = (char)t2 & 0xff; t2>>=8;

                hash[j+4] = (char)t2 & 0xff; t2>>=8;

                hash[j+3] = (char)t2 & 0xff; t2>>=8;

                hash[j+2] = (char)t2 & 0xff; t2>>=8;

                hash[j+1] = (char)t2 & 0xff; t2>>=8;

                hash[j  ] = (char)t2 & 0xff;

        }

        /* Zeroize sensitive information. */

        memset(sctx, 0, sizeof(struct sha512_ctx));

}

static void sha384_final(void *ctx, u8 *hash)

{

        struct sha512_ctx *sctx = ctx;

        u8 D[64];

        sha512_final(sctx, D);

        memcpy(hash, D, 48);

        memset(D, 0, 64);

}

static struct crypto_alg sha512 = {

        .cra_name       = "sha512",

        .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,

        .cra_blocksize  = SHA512_HMAC_BLOCK_SIZE,

        .cra_ctxsize    = sizeof(struct sha512_ctx),

        .cra_module     = THIS_MODULE,

        .cra_list       = LIST_HEAD_INIT(sha512.cra_list),

        .cra_u          = { .digest = {

                                .dia_digestsize = SHA512_DIGEST_SIZE,

                                .dia_init       = sha512_init,

                                .dia_update     = sha512_update,

                                .dia_final      = sha512_final }

        }

};

static struct crypto_alg sha384 = {

        .cra_name       = "sha384",

        .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,

        .cra_blocksize  = SHA384_HMAC_BLOCK_SIZE,

        .cra_ctxsize    = sizeof(struct sha512_ctx),

        .cra_module     = THIS_MODULE,

        .cra_list       = LIST_HEAD_INIT(sha384.cra_list),

        .cra_u          = { .digest = {

                                .dia_digestsize = SHA384_DIGEST_SIZE,

                                .dia_init       = sha384_init,

                                .dia_update     = sha512_update,

                                .dia_final      = sha384_final }

        }

};

static int __init init(void)

{

        int ret = 0;

        if ((ret = crypto_register_alg(&sha384)) < 0)

                goto out;

        if ((ret = crypto_register_alg(&sha512)) < 0)

                crypto_unregister_alg(&sha384);

out:

        return ret;

}

static void __exit fini(void)

{

        crypto_unregister_alg(&sha384);

        crypto_unregister_alg(&sha512);

}

module_init(init);

module_exit(fini);

MODULE_LICENSE("GPL");

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