/*

 *  FIPS-180-2 compliant SHA-256 implementation

 *

 *  Copyright The Mbed TLS Contributors

 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later

 */

/*

 *  The SHA-256 Secure Hash Standard was published by NIST in 2002.

 *

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

 */

#include "common.h"

#if defined(MBEDTLS_SHA256_C)

#include "mbedtls/sha256.h"

#include "mbedtls/platform_util.h"

#include "mbedtls/error.h"

#include <string.h>

#include "mbedtls/platform.h"

#define SHA256_VALIDATE_RET(cond)                           \

    MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_SHA256_BAD_INPUT_DATA)

#define SHA256_VALIDATE(cond)  MBEDTLS_INTERNAL_VALIDATE(cond)

#if !defined(MBEDTLS_SHA256_ALT)

void mbedtls_sha256_init(mbedtls_sha256_context *ctx)

{

    SHA256_VALIDATE(ctx != NULL);

    memset(ctx, 0, sizeof(mbedtls_sha256_context));

}

void mbedtls_sha256_free(mbedtls_sha256_context *ctx)

{

    if (ctx == NULL) {

        return;

    }

    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_sha256_context));

}

void mbedtls_sha256_clone(mbedtls_sha256_context *dst,

                          const mbedtls_sha256_context *src)

{

    SHA256_VALIDATE(dst != NULL);

    SHA256_VALIDATE(src != NULL);

    *dst = *src;

}

/*

 * SHA-256 context setup

 */

int mbedtls_sha256_starts_ret(mbedtls_sha256_context *ctx, int is224)

{

    SHA256_VALIDATE_RET(ctx != NULL);

    SHA256_VALIDATE_RET(is224 == 0 || is224 == 1);

    ctx->total[0] = 0;

    ctx->total[1] = 0;

    if (is224 == 0) {

        /* SHA-256 */

        ctx->state[0] = 0x6A09E667;

        ctx->state[1] = 0xBB67AE85;

        ctx->state[2] = 0x3C6EF372;

        ctx->state[3] = 0xA54FF53A;

        ctx->state[4] = 0x510E527F;

        ctx->state[5] = 0x9B05688C;

        ctx->state[6] = 0x1F83D9AB;

        ctx->state[7] = 0x5BE0CD19;

    } else {

        /* SHA-224 */

        ctx->state[0] = 0xC1059ED8;

        ctx->state[1] = 0x367CD507;

        ctx->state[2] = 0x3070DD17;

        ctx->state[3] = 0xF70E5939;

        ctx->state[4] = 0xFFC00B31;

        ctx->state[5] = 0x68581511;

        ctx->state[6] = 0x64F98FA7;

        ctx->state[7] = 0xBEFA4FA4;

    }

    ctx->is224 = is224;

    return 0;

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha256_starts(mbedtls_sha256_context *ctx,

                           int is224)

{

    mbedtls_sha256_starts_ret(ctx, is224);

}

#endif

#if !defined(MBEDTLS_SHA256_PROCESS_ALT)

static const uint32_t K[] =

{

    0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,

    0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,

    0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,

    0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,

    0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,

    0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,

    0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,

    0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,

    0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,

    0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,

    0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,

    0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,

    0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,

    0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,

    0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,

    0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,

};

#define  SHR(x, n) (((x) & 0xFFFFFFFF) >> (n))

#define ROTR(x, n) (SHR(x, n) | ((x) << (32 - (n))))

#define S0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^  SHR(x, 3))

#define S1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^  SHR(x, 10))

#define S2(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))

#define S3(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))

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

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

#define R(t)                                                        \

    (                                                               \

        local.W[t] = S1(local.W[(t) -  2]) + local.W[(t) -  7] +    \

                     S0(local.W[(t) - 15]) + local.W[(t) - 16]      \

    )

#define P(a, b, c, d, e, f, g, h, x, K)                                      \

    do                                                              \

    {                                                               \

        local.temp1 = (h) + S3(e) + F1((e), (f), (g)) + (K) + (x);    \

        local.temp2 = S2(a) + F0((a), (b), (c));                      \

        (d) += local.temp1; (h) = local.temp1 + local.temp2;        \

    } while (0)

int mbedtls_internal_sha256_process(mbedtls_sha256_context *ctx,

                                    const unsigned char data[64])

{

    struct {

        uint32_t temp1, temp2, W[64];

        uint32_t A[8];

    } local;

    unsigned int i;

    SHA256_VALIDATE_RET(ctx != NULL);

    SHA256_VALIDATE_RET((const unsigned char *) data != NULL);

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

        local.A[i] = ctx->state[i];

    }

#if defined(MBEDTLS_SHA256_SMALLER)

    for (i = 0; i < 64; i++) {

        if (i < 16) {

            local.W[i] = MBEDTLS_GET_UINT32_BE(data, 4 * i);

        } else {

            R(i);

        }

        P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],

          local.A[5], local.A[6], local.A[7], local.W[i], K[i]);

        local.temp1 = local.A[7]; local.A[7] = local.A[6];

        local.A[6] = local.A[5]; local.A[5] = local.A[4];

        local.A[4] = local.A[3]; local.A[3] = local.A[2];

        local.A[2] = local.A[1]; local.A[1] = local.A[0];

        local.A[0] = local.temp1;

    }

#else /* MBEDTLS_SHA256_SMALLER */

    for (i = 0; i < 16; i++) {

        local.W[i] = MBEDTLS_GET_UINT32_BE(data, 4 * i);

    }

    for (i = 0; i < 16; i += 8) {

        P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],

          local.A[5], local.A[6], local.A[7], local.W[i+0], K[i+0]);

        P(local.A[7], local.A[0], local.A[1], local.A[2], local.A[3],

          local.A[4], local.A[5], local.A[6], local.W[i+1], K[i+1]);

        P(local.A[6], local.A[7], local.A[0], local.A[1], local.A[2],

          local.A[3], local.A[4], local.A[5], local.W[i+2], K[i+2]);

        P(local.A[5], local.A[6], local.A[7], local.A[0], local.A[1],

          local.A[2], local.A[3], local.A[4], local.W[i+3], K[i+3]);

        P(local.A[4], local.A[5], local.A[6], local.A[7], local.A[0],

          local.A[1], local.A[2], local.A[3], local.W[i+4], K[i+4]);

        P(local.A[3], local.A[4], local.A[5], local.A[6], local.A[7],

          local.A[0], local.A[1], local.A[2], local.W[i+5], K[i+5]);

        P(local.A[2], local.A[3], local.A[4], local.A[5], local.A[6],

          local.A[7], local.A[0], local.A[1], local.W[i+6], K[i+6]);

        P(local.A[1], local.A[2], local.A[3], local.A[4], local.A[5],

          local.A[6], local.A[7], local.A[0], local.W[i+7], K[i+7]);

    }

    for (i = 16; i < 64; i += 8) {

        P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],

          local.A[5], local.A[6], local.A[7], R(i+0), K[i+0]);

        P(local.A[7], local.A[0], local.A[1], local.A[2], local.A[3],

          local.A[4], local.A[5], local.A[6], R(i+1), K[i+1]);

        P(local.A[6], local.A[7], local.A[0], local.A[1], local.A[2],

          local.A[3], local.A[4], local.A[5], R(i+2), K[i+2]);

        P(local.A[5], local.A[6], local.A[7], local.A[0], local.A[1],

          local.A[2], local.A[3], local.A[4], R(i+3), K[i+3]);

        P(local.A[4], local.A[5], local.A[6], local.A[7], local.A[0],

          local.A[1], local.A[2], local.A[3], R(i+4), K[i+4]);

        P(local.A[3], local.A[4], local.A[5], local.A[6], local.A[7],

          local.A[0], local.A[1], local.A[2], R(i+5), K[i+5]);

        P(local.A[2], local.A[3], local.A[4], local.A[5], local.A[6],

          local.A[7], local.A[0], local.A[1], R(i+6), K[i+6]);

        P(local.A[1], local.A[2], local.A[3], local.A[4], local.A[5],

          local.A[6], local.A[7], local.A[0], R(i+7), K[i+7]);

    }

#endif /* MBEDTLS_SHA256_SMALLER */

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

        ctx->state[i] += local.A[i];

    }

    /* Zeroise buffers and variables to clear sensitive data from memory. */

    mbedtls_platform_zeroize(&local, sizeof(local));

    return 0;

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha256_process(mbedtls_sha256_context *ctx,

                            const unsigned char data[64])

{

    mbedtls_internal_sha256_process(ctx, data);

}

#endif

#endif /* !MBEDTLS_SHA256_PROCESS_ALT */

/*

 * SHA-256 process buffer

 */

int mbedtls_sha256_update_ret(mbedtls_sha256_context *ctx,

                              const unsigned char *input,

                              size_t ilen)

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    size_t fill;

    uint32_t left;

    SHA256_VALIDATE_RET(ctx != NULL);

    SHA256_VALIDATE_RET(ilen == 0 || input != NULL);

    if (ilen == 0) {

        return 0;

    }

    left = ctx->total[0] & 0x3F;

    fill = 64 - left;

    ctx->total[0] += (uint32_t) ilen;

    ctx->total[0] &= 0xFFFFFFFF;

    if (ctx->total[0] < (uint32_t) ilen) {

        ctx->total[1]++;

    }

    if (left && ilen >= fill) {

        memcpy((void *) (ctx->buffer + left), input, fill);

        if ((ret = mbedtls_internal_sha256_process(ctx, ctx->buffer)) != 0) {

            return ret;

        }

        input += fill;

        ilen  -= fill;

        left = 0;

    }

    while (ilen >= 64) {

        if ((ret = mbedtls_internal_sha256_process(ctx, input)) != 0) {

            return ret;

        }

        input += 64;

        ilen  -= 64;

    }

    if (ilen > 0) {

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

    }

    return 0;

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha256_update(mbedtls_sha256_context *ctx,

                           const unsigned char *input,

                           size_t ilen)

{

    mbedtls_sha256_update_ret(ctx, input, ilen);

}

#endif

/*

 * SHA-256 final digest

 */

int mbedtls_sha256_finish_ret(mbedtls_sha256_context *ctx,

                              unsigned char output[32])

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    uint32_t used;

    uint32_t high, low;

    SHA256_VALIDATE_RET(ctx != NULL);

    SHA256_VALIDATE_RET((unsigned char *) output != NULL);

    /*

     * Add padding: 0x80 then 0x00 until 8 bytes remain for the length

     */

    used = ctx->total[0] & 0x3F;

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

    if (used <= 56) {

        /* Enough room for padding + length in current block */

        memset(ctx->buffer + used, 0, 56 - used);

    } else {

        /* We'll need an extra block */

        memset(ctx->buffer + used, 0, 64 - used);

        if ((ret = mbedtls_internal_sha256_process(ctx, ctx->buffer)) != 0) {

            return ret;

        }

        memset(ctx->buffer, 0, 56);

    }

    /*

     * Add message length

     */

    high = (ctx->total[0] >> 29)

           | (ctx->total[1] <<  3);

    low  = (ctx->total[0] <<  3);

    MBEDTLS_PUT_UINT32_BE(high, ctx->buffer, 56);

    MBEDTLS_PUT_UINT32_BE(low,  ctx->buffer, 60);

    if ((ret = mbedtls_internal_sha256_process(ctx, ctx->buffer)) != 0) {

        return ret;

    }

    /*

     * Output final state

     */

    MBEDTLS_PUT_UINT32_BE(ctx->state[0], output,  0);

    MBEDTLS_PUT_UINT32_BE(ctx->state[1], output,  4);

    MBEDTLS_PUT_UINT32_BE(ctx->state[2], output,  8);

    MBEDTLS_PUT_UINT32_BE(ctx->state[3], output, 12);

    MBEDTLS_PUT_UINT32_BE(ctx->state[4], output, 16);

    MBEDTLS_PUT_UINT32_BE(ctx->state[5], output, 20);

    MBEDTLS_PUT_UINT32_BE(ctx->state[6], output, 24);

    if (ctx->is224 == 0) {

        MBEDTLS_PUT_UINT32_BE(ctx->state[7], output, 28);

    }

    return 0;

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha256_finish(mbedtls_sha256_context *ctx,

                           unsigned char output[32])

{

    mbedtls_sha256_finish_ret(ctx, output);

}

#endif

#endif /* !MBEDTLS_SHA256_ALT */

/*

 * output = SHA-256( input buffer )

 */

int mbedtls_sha256_ret(const unsigned char *input,

                       size_t ilen,

                       unsigned char output[32],

                       int is224)

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    mbedtls_sha256_context ctx;

    SHA256_VALIDATE_RET(is224 == 0 || is224 == 1);

    SHA256_VALIDATE_RET(ilen == 0 || input != NULL);

    SHA256_VALIDATE_RET((unsigned char *) output != NULL);

    mbedtls_sha256_init(&ctx);

    if ((ret = mbedtls_sha256_starts_ret(&ctx, is224)) != 0) {

        goto exit;

    }

    if ((ret = mbedtls_sha256_update_ret(&ctx, input, ilen)) != 0) {

        goto exit;

    }

    if ((ret = mbedtls_sha256_finish_ret(&ctx, output)) != 0) {

        goto exit;

    }

exit:

    mbedtls_sha256_free(&ctx);

    return ret;

}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)

void mbedtls_sha256(const unsigned char *input,

                    size_t ilen,

                    unsigned char output[32],

                    int is224)

{

    mbedtls_sha256_ret(input, ilen, output, is224);

}

#endif

#if defined(MBEDTLS_SELF_TEST)

/*

 * FIPS-180-2 test vectors

 */

static const unsigned char sha256_test_buf[3][57] =

{

    { "abc" },

    { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },

    { "" }

};

static const size_t sha256_test_buflen[3] =

{

    3, 56, 1000

};

static const unsigned char sha256_test_sum[6][32] =

{

    /*

     * SHA-224 test vectors

     */

    { 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,

      0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,

      0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,

      0xE3, 0x6C, 0x9D, 0xA7 },

    { 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,

      0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,

      0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,

      0x52, 0x52, 0x25, 0x25 },

    { 0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8,

      0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61, 0x8A, 0x4B,

      0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE,

      0x4E, 0xE7, 0xAD, 0x67 },

    /*

     * SHA-256 test vectors

     */

    { 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,

      0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,

      0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,

      0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD },

    { 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,

      0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,

      0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,

      0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 },

    { 0xCD, 0xC7, 0x6E, 0x5C, 0x99, 0x14, 0xFB, 0x92,

      0x81, 0xA1, 0xC7, 0xE2, 0x84, 0xD7, 0x3E, 0x67,

      0xF1, 0x80, 0x9A, 0x48, 0xA4, 0x97, 0x20, 0x0E,

      0x04, 0x6D, 0x39, 0xCC, 0xC7, 0x11, 0x2C, 0xD0 }

};

/*

 * Checkup routine

 */

int mbedtls_sha256_self_test(int verbose)

{

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

    unsigned char *buf;

    unsigned char sha256sum[32];

    mbedtls_sha256_context ctx;

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

    if (NULL == buf) {

        if (verbose != 0) {

            mbedtls_printf("Buffer allocation failed\n");

        }

        return 1;

    }

    mbedtls_sha256_init(&ctx);

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

        j = i % 3;

        k = i < 3;

        if (verbose != 0) {

            mbedtls_printf("  SHA-%d test #%d: ", 256 - k * 32, j + 1);

        }

        if ((ret = mbedtls_sha256_starts_ret(&ctx, k)) != 0) {

            goto fail;

        }

        if (j == 2) {

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

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

                ret = mbedtls_sha256_update_ret(&ctx, buf, buflen);

                if (ret != 0) {

                    goto fail;

                }

            }

        } else {

            ret = mbedtls_sha256_update_ret(&ctx, sha256_test_buf[j],

                                            sha256_test_buflen[j]);

            if (ret != 0) {

                goto fail;

            }

        }

        if ((ret = mbedtls_sha256_finish_ret(&ctx, sha256sum)) != 0) {

            goto fail;

        }

        if (memcmp(sha256sum, sha256_test_sum[i], 32 - k * 4) != 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_sha256_free(&ctx);

    mbedtls_free(buf);

    return ret;

}

#endif /* MBEDTLS_SELF_TEST */

#endif /* MBEDTLS_SHA256_C */