/* mbed Microcontroller Library
 * Copyright (c) 2006-2020 ARM Limited
 *
 * 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
 *
 *     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.
 */
/****************************************************************************
 *
 * Copyright 2020 Samsung Electronics All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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
 *
 * 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.
 *
 ****************************************************************************/


#include "mbedtls/sha512.h"
#include "mbedtls/platform_util.h"


#if defined(MBEDTLS_SHA512_C)
#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
#else
#define UL64(x) x##ULL
#endif

#if defined(MBEDTLS_SHA512_ALT)
#include "mb_cmd_hash.h"
#define SHA512_VALIDATE_RET(cond)                           \
    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_SHA512_BAD_INPUT_DATA )
#define SHA512_VALIDATE(cond)  MBEDTLS_INTERNAL_VALIDATE( cond )

/*
 * 64-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT64_BE
#define GET_UINT64_BE(n,b,i)                            \
{                                                       \
    (n) = ( (uint64_t) (b)[(i)    ] << 56 )       \
        | ( (uint64_t) (b)[(i) + 1] << 48 )       \
        | ( (uint64_t) (b)[(i) + 2] << 40 )       \
        | ( (uint64_t) (b)[(i) + 3] << 32 )       \
        | ( (uint64_t) (b)[(i) + 4] << 24 )       \
        | ( (uint64_t) (b)[(i) + 5] << 16 )       \
        | ( (uint64_t) (b)[(i) + 6] <<  8 )       \
        | ( (uint64_t) (b)[(i) + 7]       );      \
}
#endif /* GET_UINT64_BE */

#ifndef PUT_UINT64_BE
#define PUT_UINT64_BE(n,b,i)                            \
{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n) >> 56 );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >> 48 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >> 40 );       \
    (b)[(i) + 3] = (unsigned char) ( (n) >> 32 );       \
    (b)[(i) + 4] = (unsigned char) ( (n) >> 24 );       \
    (b)[(i) + 5] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 6] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 7] = (unsigned char) ( (n)       );       \
}
#endif /* PUT_UINT64_BE */

static void sha512_put_uint64_be(uint64_t n, unsigned char *b, uint8_t i)
{
    PUT_UINT64_BE(n, b, i);
}


#include "string.h"
#include "sss_common.h"
#include "mb_cmd_system.h"

int mbedtls_sha512_sw_finish_ret(mbedtls_sha512_context *ctx, unsigned char output[64]);
int mbedtls_sha512_sw_update_ret(mbedtls_sha512_context *ctx, const unsigned char *input, size_t ilen);

void mbedtls_sha512_init(mbedtls_sha512_context *ctx)
{
    SHA512_VALIDATE(ctx != NULL);
    memset(ctx, 0, sizeof(mbedtls_sha512_context));
}

void mbedtls_sha512_free(mbedtls_sha512_context *ctx)
{
    if (ctx == NULL) {
        return;
    }

    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_sha512_context));
}

void mbedtls_sha512_clone(mbedtls_sha512_context *dst,
                          const mbedtls_sha512_context *src)
{
    // Corner case: Destination/source contexts are the same
    if (dst == src) {
        return;
    }

    SHA512_VALIDATE(dst != NULL);
    SHA512_VALIDATE(src != NULL);

    memcpy(dst, src, sizeof(mbedtls_sha512_context));
}

/*
 * SHA-512 context setup
 */
int mbedtls_sha512_starts_ret(mbedtls_sha512_context *ctx, int is384)
{
    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET(is384 == 0 || is384 == 1);
    memset(ctx, 0, sizeof(mbedtls_sha512_context));
    ctx->is384 = is384;

    return 0;
}

/*
 * SHA-512 process buffer
 */
int mbedtls_sha512_update_ret(mbedtls_sha512_context *ctx, const unsigned char *input, size_t ilen)
{
    if (ilen > MAX_MB_HASH_BLOCK_BLEN || (ctx->totals + ilen) > MAX_MB_HASH_BLOCK_BLEN || ctx->totals > MAX_MB_HASH_BLOCK_BLEN) {
        // H/W SHA has limitation to seperated API with oversized message.
        // fallback to S/W from H/W pre-tested
        if (ctx->totals == 0 || ctx->hw == 1) {
            ctx->total[0] = 0;
            ctx->total[1] = 0;
            if (ctx->is384) {
                /* SHA-384 */
                ctx->state[0] = UL64(0xCBBB9D5DC1059ED8);
                ctx->state[1] = UL64(0x629A292A367CD507);
                ctx->state[2] = UL64(0x9159015A3070DD17);
                ctx->state[3] = UL64(0x152FECD8F70E5939);
                ctx->state[4] = UL64(0x67332667FFC00B31);
                ctx->state[5] = UL64(0x8EB44A8768581511);
                ctx->state[6] = UL64(0xDB0C2E0D64F98FA7);
                ctx->state[7] = UL64(0x47B5481DBEFA4FA4);
            } else {
                /* SHA-512 */
                ctx->state[0] = UL64(0x6A09E667F3BCC908);
                ctx->state[1] = UL64(0xBB67AE8584CAA73B);
                ctx->state[2] = UL64(0x3C6EF372FE94F82B);
                ctx->state[3] = UL64(0xA54FF53A5F1D36F1);
                ctx->state[4] = UL64(0x510E527FADE682D1);
                ctx->state[5] = UL64(0x9B05688C2B3E6C1F);
                ctx->state[6] = UL64(0x1F83D9ABFB41BD6B);
                ctx->state[7] = UL64(0x5BE0CD19137E2179);
            }
        }
        ctx->totals += ilen;
        //in case, H/W -> S/W fallback case
        if ((ctx->totals + ilen) > MAX_MB_HASH_BLOCK_BLEN && ctx->hw == 1) {
            //214 + 2577
            mbedtls_sha512_sw_update_ret(ctx, ctx->sbuf, ctx->pstMessage.u32DataByteLen);
        }
        ctx->hw = 0;
        mbedtls_sha512_sw_update_ret(ctx, input, ilen);
    } else {
        // SHA-256 handle by SSS H/W
        memcpy(ctx->sbuf + ctx->pstMessage.u32DataByteLen, input, ilen);
        ctx->pstMessage.u32DataByteLen += ilen;
        ctx->totals += ilen;
        ctx->hw = 1;
    }

    return 0;
}

/*
 * SHA-256 final digest
 */
int mbedtls_sha512_finish_ret(mbedtls_sha512_context *ctx, unsigned char output[64])
{
    if (ctx->totals > MAX_MB_HASH_BLOCK_BLEN)  {
        mbedtls_sha512_sw_finish_ret(ctx, output);
    } else {
        int ret = FAIL;
        unsigned int object_id;
        unsigned int block_byte_len;

        ctx->pstDigest.pu08Data = output; /* assign output buffer */

        stOCTET_STRING stHASH_Input;
        //! step 0 : clear Mailbox
        ret = mb_system_clear(CLEAR_TYPE_MAILBOX);

        if (ret != SSSR_SUCCESS) {
            return ret;
        }

        //! assign hash_byte_len to compare returned result from sss_fw after hash operation
        if (ctx->is384 == 0) {
            object_id = OID_SHA2_512;
        } else {
            object_id = OID_SHA2_384;
        }

        block_byte_len = 64;

        //! step 1 : set message length parameter to SSS
        ret = mb_hash_init(&ctx->pstMessage, object_id);

        if (ret != SSSR_SUCCESS) {
            return ret;
        }

        //! step 2 : set message block to SSS
        ctx->pstMessage.pu08Data = ctx->sbuf;
        stHASH_Input.pu08Data = ctx->pstMessage.pu08Data;
        stHASH_Input.u32DataByteLen = ctx->pstMessage.u32DataByteLen;

        ret = mb_hash_update(&stHASH_Input, block_byte_len);

        if (ret != SSSR_SUCCESS) {
            return ret;
        }

        //! step 3 : get hash result from SSS
        ret = mb_hash_final(&stHASH_Input, &ctx->pstDigest);

        if (ret != SSSR_SUCCESS) {
            return ret;
        }

    }
    return 0;
}

/*
 * Round constants
 */
static const uint64_t K[80] = {
    UL64(0x428A2F98D728AE22),  UL64(0x7137449123EF65CD),
    UL64(0xB5C0FBCFEC4D3B2F),  UL64(0xE9B5DBA58189DBBC),
    UL64(0x3956C25BF348B538),  UL64(0x59F111F1B605D019),
    UL64(0x923F82A4AF194F9B),  UL64(0xAB1C5ED5DA6D8118),
    UL64(0xD807AA98A3030242),  UL64(0x12835B0145706FBE),
    UL64(0x243185BE4EE4B28C),  UL64(0x550C7DC3D5FFB4E2),
    UL64(0x72BE5D74F27B896F),  UL64(0x80DEB1FE3B1696B1),
    UL64(0x9BDC06A725C71235),  UL64(0xC19BF174CF692694),
    UL64(0xE49B69C19EF14AD2),  UL64(0xEFBE4786384F25E3),
    UL64(0x0FC19DC68B8CD5B5),  UL64(0x240CA1CC77AC9C65),
    UL64(0x2DE92C6F592B0275),  UL64(0x4A7484AA6EA6E483),
    UL64(0x5CB0A9DCBD41FBD4),  UL64(0x76F988DA831153B5),
    UL64(0x983E5152EE66DFAB),  UL64(0xA831C66D2DB43210),
    UL64(0xB00327C898FB213F),  UL64(0xBF597FC7BEEF0EE4),
    UL64(0xC6E00BF33DA88FC2),  UL64(0xD5A79147930AA725),
    UL64(0x06CA6351E003826F),  UL64(0x142929670A0E6E70),
    UL64(0x27B70A8546D22FFC),  UL64(0x2E1B21385C26C926),
    UL64(0x4D2C6DFC5AC42AED),  UL64(0x53380D139D95B3DF),
    UL64(0x650A73548BAF63DE),  UL64(0x766A0ABB3C77B2A8),
    UL64(0x81C2C92E47EDAEE6),  UL64(0x92722C851482353B),
    UL64(0xA2BFE8A14CF10364),  UL64(0xA81A664BBC423001),
    UL64(0xC24B8B70D0F89791),  UL64(0xC76C51A30654BE30),
    UL64(0xD192E819D6EF5218),  UL64(0xD69906245565A910),
    UL64(0xF40E35855771202A),  UL64(0x106AA07032BBD1B8),
    UL64(0x19A4C116B8D2D0C8),  UL64(0x1E376C085141AB53),
    UL64(0x2748774CDF8EEB99),  UL64(0x34B0BCB5E19B48A8),
    UL64(0x391C0CB3C5C95A63),  UL64(0x4ED8AA4AE3418ACB),
    UL64(0x5B9CCA4F7763E373),  UL64(0x682E6FF3D6B2B8A3),
    UL64(0x748F82EE5DEFB2FC),  UL64(0x78A5636F43172F60),
    UL64(0x84C87814A1F0AB72),  UL64(0x8CC702081A6439EC),
    UL64(0x90BEFFFA23631E28),  UL64(0xA4506CEBDE82BDE9),
    UL64(0xBEF9A3F7B2C67915),  UL64(0xC67178F2E372532B),
    UL64(0xCA273ECEEA26619C),  UL64(0xD186B8C721C0C207),
    UL64(0xEADA7DD6CDE0EB1E),  UL64(0xF57D4F7FEE6ED178),
    UL64(0x06F067AA72176FBA),  UL64(0x0A637DC5A2C898A6),
    UL64(0x113F9804BEF90DAE),  UL64(0x1B710B35131C471B),
    UL64(0x28DB77F523047D84),  UL64(0x32CAAB7B40C72493),
    UL64(0x3C9EBE0A15C9BEBC),  UL64(0x431D67C49C100D4C),
    UL64(0x4CC5D4BECB3E42B6),  UL64(0x597F299CFC657E2A),
    UL64(0x5FCB6FAB3AD6FAEC),  UL64(0x6C44198C4A475817)
};

int mbedtls_internal_sha512_process(mbedtls_sha512_context *ctx,
                                    const unsigned char data[128])
{
    int i;
    uint64_t temp1, temp2, W[80];
    uint64_t A[8];

    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET((const unsigned char *)data != NULL);

#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)                                  \
    do                                                          \
    {                                                           \
        temp1 = (h) + S3(e) + F1((e),(f),(g)) + (K) + (x);      \
        temp2 = S2(a) + F0((a),(b),(c));                        \
        (d) += temp1; (h) = temp1 + temp2;                      \
    } while( 0 )

    for (i = 0; i < 8; i++) {
        A[i] = ctx->state[i];
    }

    for (i = 0; i < 80; i++) {
        if (i < 16) {
            GET_UINT64_BE(W[i], data, i << 3);
        } else {
            W[i] = S1(W[i -  2]) + W[i -  7] +
                   S0(W[i - 15]) + W[i - 16];
        }

        P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i]);

        temp1 = A[7];
        A[7] = A[6];
        A[6] = A[5];
        A[5] = A[4];
        A[4] = A[3];
        A[3] = A[2];
        A[2] = A[1];
        A[1] = A[0];
        A[0] = temp1;
    }

    for (i = 0; i < 8; i++) {
        ctx->state[i] += A[i];
    }

    return 0;
}

int mbedtls_sha512_sw_finish_ret(mbedtls_sha512_context *ctx,
                                 unsigned char output[64])
{
    int ret;
    unsigned used;
    uint64_t high, low;

    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET((unsigned char *)output != NULL);

    /*
     * Add padding: 0x80 then 0x00 until 16 bytes remain for the length
     */
    used = ctx->total[0] & 0x7F;

    ctx->buffer[used++] = 0x80;

    if (used <= 112) {
        /* Enough room for padding + length in current block */
        memset(ctx->buffer + used, 0, 112 - used);
    } else {
        /* We'll need an extra block */
        memset(ctx->buffer + used, 0, 128 - used);

        if ((ret = mbedtls_internal_sha512_process(ctx, ctx->buffer)) != 0) {
            return (ret);
        }

        memset(ctx->buffer, 0, 112);
    }

    /*
     * Add message length
     */
    high = (ctx->total[0] >> 61)
           | (ctx->total[1] <<  3);
    low  = (ctx->total[0] <<  3);

    sha512_put_uint64_be(high, ctx->buffer, 112);
    sha512_put_uint64_be(low,  ctx->buffer, 120);

    if ((ret = mbedtls_internal_sha512_process(ctx, ctx->buffer)) != 0) {
        return (ret);
    }

    /*
     * Output final state
     */
    sha512_put_uint64_be(ctx->state[0], output,  0);
    sha512_put_uint64_be(ctx->state[1], output,  8);
    sha512_put_uint64_be(ctx->state[2], output, 16);
    sha512_put_uint64_be(ctx->state[3], output, 24);
    sha512_put_uint64_be(ctx->state[4], output, 32);
    sha512_put_uint64_be(ctx->state[5], output, 40);

    if (ctx->is384 == 0) {
        sha512_put_uint64_be(ctx->state[6], output, 48);
        sha512_put_uint64_be(ctx->state[7], output, 56);
    }

    return 0;
}

int mbedtls_sha512_sw_update_ret(mbedtls_sha512_context *ctx, const unsigned char *input, size_t ilen)
{
    int ret;
    size_t fill;
    unsigned int left;

    SHA512_VALIDATE_RET(ctx != NULL);
    SHA512_VALIDATE_RET(ilen == 0 || input != NULL);

    if (ilen == 0) {
        return (0);
    }

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

    ctx->total[0] += (uint64_t) ilen;

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

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

        if ((ret = mbedtls_internal_sha512_process(ctx, ctx->buffer)) != 0) {
            return (ret);
        }

        input += fill;
        ilen  -= fill;
        left = 0;
    }

    while (ilen >= 128) {
        if ((ret = mbedtls_internal_sha512_process(ctx, input)) != 0) {
            return (ret);
        }

        input += 128;
        ilen  -= 128;
    }

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

    return 0;
}



#endif /* MBEDTLS_SHA512_ALT */
#endif /* MBEDTLS_SHA512_C */