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/*

 *  FIPS-180-2 compliant SHA-384/512 implementation

 *

 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved

 *  SPDX-License-Identifier: GPL-2.0

 *

 *  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.

 *

 *  This file is part of mbed TLS (https://tls.mbed.org)

 */

/*

 *  The SHA-512 Secure Hash Standard was published by NIST in 2002.

 *

 *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf

 */

#if !defined(MBEDTLS_CONFIG_FILE)

#include "mbedtls/config.h"

#else

#include MBEDTLS_CONFIG_FILE

#endif

#if defined(MBEDTLS_SHA512_C)

#include "mbedtls/sha512.h"

#include "mbedtls/platform_util.h"

#if defined(_MSC_VER) || defined(__WATCOMC__)

  #define UL64(x) x##ui64

#else

  #define UL64(x) x##ULL

#endif

#include 

#if defined(MBEDTLS_SELF_TEST)

#if defined(MBEDTLS_PLATFORM_C)

#include "mbedtls/platform.h"

#else

#include 

#include 

#define mbedtls_printf printf

#define mbedtls_calloc    calloc

#define mbedtls_free       free

#endif /* MBEDTLS_PLATFORM_C */

#endif /* MBEDTLS_SELF_TEST */

#define SHA512_VALIDATE_RET(cond)                           \

    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_SHA512_BAD_INPUT_DATA )

#define SHA512_VALIDATE(cond)  MBEDTLS_INTERNAL_VALIDATE( cond )

#if !defined(MBEDTLS_SHA512_ALT)

/*

 * 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 */

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 )

{

    SHA512_VALIDATE( dst != NULL );

    SHA512_VALIDATE( src != NULL );

    *dst = *src;

}

/*

 * 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 );

    ctx->total[0] = 0;

    ctx->total[1] = 0;

    if( is384 == 0 )

    {

        /* 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);

    }

    else

    {

        /* 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);

    }

    ctx->is384 = is384;

    return( 0 );

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha512_starts( mbedtls_sha512_context *ctx,

                            int is384 )

{

    mbedtls_sha512_starts_ret( ctx, is384 );

}

#endif

#if !defined(MBEDTLS_SHA512_PROCESS_ALT)

/*

 * 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, B, C, D, E, F, G, H;

    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 < 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;

    return( 0 );

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha512_process( mbedtls_sha512_context *ctx,

                             const unsigned char data[128] )

{

    mbedtls_internal_sha512_process( ctx, data );

}

#endif

#endif /* !MBEDTLS_SHA512_PROCESS_ALT */

/*

 * SHA-512 process buffer

 */

int mbedtls_sha512_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 );

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha512_update( mbedtls_sha512_context *ctx,

                            const unsigned char *input,

                            size_t ilen )

{

    mbedtls_sha512_update_ret( ctx, input, ilen );

}

#endif

/*

 * SHA-512 final digest

 */

int mbedtls_sha512_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 );

    PUT_UINT64_BE( high, ctx->buffer, 112 );

    PUT_UINT64_BE( low,  ctx->buffer, 120 );

    if( ( ret = mbedtls_internal_sha512_process( ctx, ctx->buffer ) ) != 0 )

        return( ret );

    /*

     * Output final state

     */

    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 );

    }

    return( 0 );

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha512_finish( mbedtls_sha512_context *ctx,

                            unsigned char output[64] )

{

    mbedtls_sha512_finish_ret( ctx, output );

}

#endif

#endif /* !MBEDTLS_SHA512_ALT */

/*

 * output = SHA-512( input buffer )

 */

int mbedtls_sha512_ret( const unsigned char *input,

                    size_t ilen,

                    unsigned char output[64],

                    int is384 )

{

    int ret;

    mbedtls_sha512_context ctx;

    SHA512_VALIDATE_RET( is384 == 0 || is384 == 1 );

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

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

    mbedtls_sha512_init( &ctx );

    if( ( ret = mbedtls_sha512_starts_ret( &ctx, is384 ) ) != 0 )

        goto exit;

    if( ( ret = mbedtls_sha512_update_ret( &ctx, input, ilen ) ) != 0 )

        goto exit;

    if( ( ret = mbedtls_sha512_finish_ret( &ctx, output ) ) != 0 )

        goto exit;

exit:

    mbedtls_sha512_free( &ctx );

    return( ret );

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha512( const unsigned char *input,

                     size_t ilen,

                     unsigned char output[64],

                     int is384 )

{

    mbedtls_sha512_ret( input, ilen, output, is384 );

}

#endif

#if defined(MBEDTLS_SELF_TEST)

/*

 * FIPS-180-2 test vectors

 */

static const unsigned char sha512_test_buf[3][113] =

{

    { "abc" },

    { "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"

      "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu" },

    { "" }

};

static const size_t sha512_test_buflen[3] =

{

    3, 112, 1000

};

static const unsigned char sha512_test_sum[6][64] =

{

    /*

     * SHA-384 test vectors

     */

    { 0xCB, 0x00, 0x75, 0x3F, 0x45, 0xA3, 0x5E, 0x8B,

      0xB5, 0xA0, 0x3D, 0x69, 0x9A, 0xC6, 0x50, 0x07,

      0x27, 0x2C, 0x32, 0xAB, 0x0E, 0xDE, 0xD1, 0x63,

      0x1A, 0x8B, 0x60, 0x5A, 0x43, 0xFF, 0x5B, 0xED,

      0x80, 0x86, 0x07, 0x2B, 0xA1, 0xE7, 0xCC, 0x23,

      0x58, 0xBA, 0xEC, 0xA1, 0x34, 0xC8, 0x25, 0xA7 },

    { 0x09, 0x33, 0x0C, 0x33, 0xF7, 0x11, 0x47, 0xE8,

      0x3D, 0x19, 0x2F, 0xC7, 0x82, 0xCD, 0x1B, 0x47,

      0x53, 0x11, 0x1B, 0x17, 0x3B, 0x3B, 0x05, 0xD2,

      0x2F, 0xA0, 0x80, 0x86, 0xE3, 0xB0, 0xF7, 0x12,

      0xFC, 0xC7, 0xC7, 0x1A, 0x55, 0x7E, 0x2D, 0xB9,

      0x66, 0xC3, 0xE9, 0xFA, 0x91, 0x74, 0x60, 0x39 },

    { 0x9D, 0x0E, 0x18, 0x09, 0x71, 0x64, 0x74, 0xCB,

      0x08, 0x6E, 0x83, 0x4E, 0x31, 0x0A, 0x4A, 0x1C,

      0xED, 0x14, 0x9E, 0x9C, 0x00, 0xF2, 0x48, 0x52,

      0x79, 0x72, 0xCE, 0xC5, 0x70, 0x4C, 0x2A, 0x5B,

      0x07, 0xB8, 0xB3, 0xDC, 0x38, 0xEC, 0xC4, 0xEB,

      0xAE, 0x97, 0xDD, 0xD8, 0x7F, 0x3D, 0x89, 0x85 },

    /*

     * SHA-512 test vectors

     */

    { 0xDD, 0xAF, 0x35, 0xA1, 0x93, 0x61, 0x7A, 0xBA,

      0xCC, 0x41, 0x73, 0x49, 0xAE, 0x20, 0x41, 0x31,

      0x12, 0xE6, 0xFA, 0x4E, 0x89, 0xA9, 0x7E, 0xA2,

      0x0A, 0x9E, 0xEE, 0xE6, 0x4B, 0x55, 0xD3, 0x9A,

      0x21, 0x92, 0x99, 0x2A, 0x27, 0x4F, 0xC1, 0xA8,

      0x36, 0xBA, 0x3C, 0x23, 0xA3, 0xFE, 0xEB, 0xBD,

      0x45, 0x4D, 0x44, 0x23, 0x64, 0x3C, 0xE8, 0x0E,

      0x2A, 0x9A, 0xC9, 0x4F, 0xA5, 0x4C, 0xA4, 0x9F },

    { 0x8E, 0x95, 0x9B, 0x75, 0xDA, 0xE3, 0x13, 0xDA,

      0x8C, 0xF4, 0xF7, 0x28, 0x14, 0xFC, 0x14, 0x3F,

      0x8F, 0x77, 0x79, 0xC6, 0xEB, 0x9F, 0x7F, 0xA1,

      0x72, 0x99, 0xAE, 0xAD, 0xB6, 0x88, 0x90, 0x18,

      0x50, 0x1D, 0x28, 0x9E, 0x49, 0x00, 0xF7, 0xE4,

      0x33, 0x1B, 0x99, 0xDE, 0xC4, 0xB5, 0x43, 0x3A,

      0xC7, 0xD3, 0x29, 0xEE, 0xB6, 0xDD, 0x26, 0x54,

      0x5E, 0x96, 0xE5, 0x5B, 0x87, 0x4B, 0xE9, 0x09 },

    { 0xE7, 0x18, 0x48, 0x3D, 0x0C, 0xE7, 0x69, 0x64,

      0x4E, 0x2E, 0x42, 0xC7, 0xBC, 0x15, 0xB4, 0x63,

      0x8E, 0x1F, 0x98, 0xB1, 0x3B, 0x20, 0x44, 0x28,

      0x56, 0x32, 0xA8, 0x03, 0xAF, 0xA9, 0x73, 0xEB,

      0xDE, 0x0F, 0xF2, 0x44, 0x87, 0x7E, 0xA6, 0x0A,

      0x4C, 0xB0, 0x43, 0x2C, 0xE5, 0x77, 0xC3, 0x1B,

      0xEB, 0x00, 0x9C, 0x5C, 0x2C, 0x49, 0xAA, 0x2E,

      0x4E, 0xAD, 0xB2, 0x17, 0xAD, 0x8C, 0xC0, 0x9B }

};

/*

 * Checkup routine

 */

int mbedtls_sha512_self_test( int verbose )

{

    int i, j, k, buflen, ret = 0;

    unsigned char *buf;

    unsigned char sha512sum[64];

    mbedtls_sha512_context ctx;

    buf = mbedtls_calloc( 1024, sizeof(unsigned char) );

    if( NULL == buf )

    {

        if( verbose != 0 )

            mbedtls_printf( "Buffer allocation failed\n" );

        return( 1 );

    }

    mbedtls_sha512_init( &ctx );

    for( i = 0; i < 6; i++ )

    {

        j = i % 3;

        k = i < 3;

        if( verbose != 0 )

            mbedtls_printf( "  SHA-%d test #%d: ", 512 - k * 128, j + 1 );

        if( ( ret = mbedtls_sha512_starts_ret( &ctx, k ) ) != 0 )

            goto fail;

        if( j == 2 )

        {

            memset( buf, 'a', buflen = 1000 );

            for( j = 0; j < 1000; j++ )

            {

                ret = mbedtls_sha512_update_ret( &ctx, buf, buflen );

                if( ret != 0 )

                    goto fail;

            }

        }

        else

        {

            ret = mbedtls_sha512_update_ret( &ctx, sha512_test_buf[j],

                                             sha512_test_buflen[j] );

            if( ret != 0 )

                goto fail;

        }

        if( ( ret = mbedtls_sha512_finish_ret( &ctx, sha512sum ) ) != 0 )

            goto fail;

        if( memcmp( sha512sum, sha512_test_sum[i], 64 - k * 16 ) != 0 )

        {

            ret = 1;

            goto fail;

        }

        if( verbose != 0 )

            mbedtls_printf( "passed\n" );

    }

    if( verbose != 0 )

        mbedtls_printf( "\n" );

    goto exit;

fail:

    if( verbose != 0 )

        mbedtls_printf( "failed\n" );

exit:

    mbedtls_sha512_free( &ctx );

    mbedtls_free( buf );

    return( ret );

}

#endif /* MBEDTLS_SELF_TEST */

#endif /* MBEDTLS_SHA512_C */