/*

 * Copyright 2004-2026 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * SHA256 low level APIs are deprecated for public use, but still ok for

 * internal use.

 */

#include "internal/deprecated.h"

#include <openssl/opensslconf.h>

#include <stdlib.h>

#include <string.h>

#include <openssl/crypto.h>

#include <openssl/sha.h>

#include <openssl/opensslv.h>

#include "internal/endian.h"

#include "crypto/sha.h"

int SHA224_Init(SHA256_CTX *c)

{

    memset(c, 0, sizeof(*c));

    c->h[0] = 0xc1059ed8UL;

    c->h[1] = 0x367cd507UL;

    c->h[2] = 0x3070dd17UL;

    c->h[3] = 0xf70e5939UL;

    c->h[4] = 0xffc00b31UL;

    c->h[5] = 0x68581511UL;

    c->h[6] = 0x64f98fa7UL;

    c->h[7] = 0xbefa4fa4UL;

    c->md_len = SHA224_DIGEST_LENGTH;

    return 1;

}

int SHA256_Init(SHA256_CTX *c)

{

    memset(c, 0, sizeof(*c));

    c->h[0] = 0x6a09e667UL;

    c->h[1] = 0xbb67ae85UL;

    c->h[2] = 0x3c6ef372UL;

    c->h[3] = 0xa54ff53aUL;

    c->h[4] = 0x510e527fUL;

    c->h[5] = 0x9b05688cUL;

    c->h[6] = 0x1f83d9abUL;

    c->h[7] = 0x5be0cd19UL;

    c->md_len = SHA256_DIGEST_LENGTH;

    return 1;

}

int ossl_sha256_192_init(SHA256_CTX *c)

{

    SHA256_Init(c);

    c->md_len = SHA256_192_DIGEST_LENGTH;

    return 1;

}

int SHA224_Update(SHA256_CTX *c, const void *data, size_t len)

{

    return SHA256_Update(c, data, len);

}

int SHA224_Final(unsigned char *md, SHA256_CTX *c)

{

    return SHA256_Final(md, c);

}

#define DATA_ORDER_IS_BIG_ENDIAN

#define HASH_LONG SHA_LONG

#define HASH_CTX SHA256_CTX

#define HASH_CBLOCK SHA_CBLOCK

/*

 * Note that FIPS180-2 discusses "Truncation of the Hash Function Output."

 * default: case below covers for it. It's not clear however if it's

 * permitted to truncate to amount of bytes not divisible by 4. I bet not,

 * but if it is, then default: case shall be extended. For reference.

 * Idea behind separate cases for pre-defined lengths is to let the

 * compiler decide if it's appropriate to unroll small loops.

 */

#define HASH_MAKE_STRING(c, s)                                      \

    do {                                                            \

        unsigned long ll;                                           \

        unsigned int nn;                                            \

        switch ((c)->md_len) {                                      \

        case SHA256_192_DIGEST_LENGTH:                              \

            for (nn = 0; nn < SHA256_192_DIGEST_LENGTH / 4; nn++) { \

                ll = (c)->h[nn];                                    \

                (void)HOST_l2c(ll, (s));                            \

            }                                                       \

            break;                                                  \

        case SHA224_DIGEST_LENGTH:                                  \

            for (nn = 0; nn < SHA224_DIGEST_LENGTH / 4; nn++) {     \

                ll = (c)->h[nn];                                    \

                (void)HOST_l2c(ll, (s));                            \

            }                                                       \

            break;                                                  \

        case SHA256_DIGEST_LENGTH:                                  \

            for (nn = 0; nn < SHA256_DIGEST_LENGTH / 4; nn++) {     \

                ll = (c)->h[nn];                                    \

                (void)HOST_l2c(ll, (s));                            \

            }                                                       \

            break;                                                  \

        default:                                                    \

            if ((c)->md_len > SHA256_DIGEST_LENGTH)                 \

                return 0;                                           \

            for (nn = 0; nn < (c)->md_len / 4; nn++) {              \

                ll = (c)->h[nn];                                    \

                (void)HOST_l2c(ll, (s));                            \

            }                                                       \

            break;                                                  \

        }                                                           \

    } while (0)

#define HASH_UPDATE_THUNK

#define HASH_UPDATE SHA256_Update_thunk

#define HASH_TRANSFORM SHA256_Transform

#define HASH_FINAL SHA256_Final

#define HASH_BLOCK_DATA_ORDER sha256_block_data_order

#ifndef SHA256_ASM

static

#else

#ifdef INCLUDE_C_SHA256

void sha256_block_data_order_c(SHA256_CTX *ctx, const void *in, size_t num);

#endif /* INCLUDE_C_SHA256 */

#endif /* SHA256_ASM */

    void sha256_block_data_order(SHA256_CTX *ctx, const void *in, size_t num);

/* clang-format off */

#include "crypto/md32_common.inc"

/* clang-format on */

#undef HASH_UPDATE_THUNK

int SHA256_Update(SHA256_CTX *ctx, const void *data, size_t sz)

{

    return SHA256_Update_thunk((void *)ctx, (const unsigned char *)data, sz);

}

#if !defined(SHA256_ASM) || defined(INCLUDE_C_SHA256)

static const SHA_LONG K256[64] = {

    0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,

    0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,

    0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,

    0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,

    0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,

    0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,

    0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,

    0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,

    0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,

    0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,

    0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,

    0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,

    0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,

    0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,

    0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,

    0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL

};

#ifndef PEDANTIC

#if defined(__GNUC__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM)

#if defined(__riscv_zknh)

#define Sigma0(x) ({ MD32_REG_T ret;            \

                        asm ("sha256sum0 %0, %1"    \

                        : "=r"(ret)                 \

                        : "r"(x)); ret; })

#define Sigma1(x) ({ MD32_REG_T ret;            \

                        asm ("sha256sum1 %0, %1"    \

                        : "=r"(ret)                 \

                        : "r"(x)); ret; })

#define sigma0(x) ({ MD32_REG_T ret;            \

                        asm ("sha256sig0 %0, %1"    \

                        : "=r"(ret)                 \

                        : "r"(x)); ret; })

#define sigma1(x) ({ MD32_REG_T ret;            \

                        asm ("sha256sig1 %0, %1"    \

                        : "=r"(ret)                 \

                        : "r"(x)); ret; })

#endif

#if defined(__riscv_zbt) || defined(__riscv_zpn)

#define Ch(x, y, z) ({  MD32_REG_T ret;                           \

                        asm (".insn r4 0x33, 1, 0x3, %0, %2, %1, %3"\

                        : "=r"(ret)                                 \

                        : "r"(x), "r"(y), "r"(z)); ret; })

#define Maj(x, y, z) ({ MD32_REG_T ret;                           \

                        asm (".insn r4 0x33, 1, 0x3, %0, %2, %1, %3"\

                        : "=r"(ret)                                 \

                        : "r"(x^z), "r"(y), "r"(x)); ret; })

#endif

#endif

#endif

/*

 * FIPS specification refers to right rotations, while our ROTATE macro

 * is left one. This is why you might notice that rotation coefficients

 * differ from those observed in FIPS document by 32-N...

 */

#ifndef Sigma0

#define Sigma0(x) (ROTATE((x), 30) ^ ROTATE((x), 19) ^ ROTATE((x), 10))

#endif

#ifndef Sigma1

#define Sigma1(x) (ROTATE((x), 26) ^ ROTATE((x), 21) ^ ROTATE((x), 7))

#endif

#ifndef sigma0

#define sigma0(x) (ROTATE((x), 25) ^ ROTATE((x), 14) ^ ((x) >> 3))

#endif

#ifndef sigma1

#define sigma1(x) (ROTATE((x), 15) ^ ROTATE((x), 13) ^ ((x) >> 10))

#endif

#ifndef Ch

#define Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))

#endif

#ifndef Maj

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

#endif

#ifdef OPENSSL_SMALL_FOOTPRINT

static void sha256_block_data_order(SHA256_CTX *ctx, const void *in,

    size_t num)

{

    unsigned MD32_REG_T a, b, c, d, e, f, g, h, s0, s1, T1, T2;

    SHA_LONG X[16], l;

    int i;

    const unsigned char *data = in;

    while (num--) {

        a = ctx->h[0];

        b = ctx->h[1];

        c = ctx->h[2];

        d = ctx->h[3];

        e = ctx->h[4];

        f = ctx->h[5];

        g = ctx->h[6];

        h = ctx->h[7];

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

            (void)HOST_c2l(data, l);

            T1 = X[i] = l;

            T1 += h + Sigma1(e) + Ch(e, f, g) + K256[i];

            T2 = Sigma0(a) + Maj(a, b, c);

            h = g;

            g = f;

            f = e;

            e = d + T1;

            d = c;

            c = b;

            b = a;

            a = T1 + T2;

        }

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

            s0 = X[(i + 1) & 0x0f];

            s0 = sigma0(s0);

            s1 = X[(i + 14) & 0x0f];

            s1 = sigma1(s1);

            T1 = X[i & 0xf] += s0 + s1 + X[(i + 9) & 0xf];

            T1 += h + Sigma1(e) + Ch(e, f, g) + K256[i];

            T2 = Sigma0(a) + Maj(a, b, c);

            h = g;

            g = f;

            f = e;

            e = d + T1;

            d = c;

            c = b;

            b = a;

            a = T1 + T2;

        }

        ctx->h[0] += a;

        ctx->h[1] += b;

        ctx->h[2] += c;

        ctx->h[3] += d;

        ctx->h[4] += e;

        ctx->h[5] += f;

        ctx->h[6] += g;

        ctx->h[7] += h;

    }

}

#else

#define ROUND_00_15(i, a, b, c, d, e, f, g, h)       \

    do {                                             \

        T1 += h + Sigma1(e) + Ch(e, f, g) + K256[i]; \

        h = Sigma0(a) + Maj(a, b, c);                \

        d += T1;                                     \

        h += T1;                                     \

    } while (0)

#define ROUND_16_63(i, a, b, c, d, e, f, g, h, X)          \

    do {                                                   \

        s0 = X[(i + 1) & 0x0f];                            \

        s0 = sigma0(s0);                                   \

        s1 = X[(i + 14) & 0x0f];                           \

        s1 = sigma1(s1);                                   \

        T1 = X[(i) & 0x0f] += s0 + s1 + X[(i + 9) & 0x0f]; \

        ROUND_00_15(i, a, b, c, d, e, f, g, h);            \

    } while (0)

#ifdef INCLUDE_C_SHA256

void sha256_block_data_order_c(SHA256_CTX *ctx, const void *in, size_t num)

#else

static void sha256_block_data_order(SHA256_CTX *ctx, const void *in,

    size_t num)

#endif

{

    unsigned MD32_REG_T a, b, c, d, e, f, g, h, s0, s1, T1;

    SHA_LONG X[16];

    int i;

    const unsigned char *data = in;

    DECLARE_IS_ENDIAN;

    while (num--) {

        a = ctx->h[0];

        b = ctx->h[1];

        c = ctx->h[2];

        d = ctx->h[3];

        e = ctx->h[4];

        f = ctx->h[5];

        g = ctx->h[6];

        h = ctx->h[7];

        if (!IS_LITTLE_ENDIAN && sizeof(SHA_LONG) == 4

            && ((size_t)in % 4) == 0) {

            const SHA_LONG *W = (const SHA_LONG *)data;

            T1 = X[0] = W[0];

            ROUND_00_15(0, a, b, c, d, e, f, g, h);

            T1 = X[1] = W[1];

            ROUND_00_15(1, h, a, b, c, d, e, f, g);

            T1 = X[2] = W[2];

            ROUND_00_15(2, g, h, a, b, c, d, e, f);

            T1 = X[3] = W[3];

            ROUND_00_15(3, f, g, h, a, b, c, d, e);

            T1 = X[4] = W[4];

            ROUND_00_15(4, e, f, g, h, a, b, c, d);

            T1 = X[5] = W[5];

            ROUND_00_15(5, d, e, f, g, h, a, b, c);

            T1 = X[6] = W[6];

            ROUND_00_15(6, c, d, e, f, g, h, a, b);

            T1 = X[7] = W[7];

            ROUND_00_15(7, b, c, d, e, f, g, h, a);

            T1 = X[8] = W[8];

            ROUND_00_15(8, a, b, c, d, e, f, g, h);

            T1 = X[9] = W[9];

            ROUND_00_15(9, h, a, b, c, d, e, f, g);

            T1 = X[10] = W[10];

            ROUND_00_15(10, g, h, a, b, c, d, e, f);

            T1 = X[11] = W[11];

            ROUND_00_15(11, f, g, h, a, b, c, d, e);

            T1 = X[12] = W[12];

            ROUND_00_15(12, e, f, g, h, a, b, c, d);

            T1 = X[13] = W[13];

            ROUND_00_15(13, d, e, f, g, h, a, b, c);

            T1 = X[14] = W[14];

            ROUND_00_15(14, c, d, e, f, g, h, a, b);

            T1 = X[15] = W[15];

            ROUND_00_15(15, b, c, d, e, f, g, h, a);

            data += SHA256_CBLOCK;

        } else {

            SHA_LONG l;

            (void)HOST_c2l(data, l);

            T1 = X[0] = l;

            ROUND_00_15(0, a, b, c, d, e, f, g, h);

            (void)HOST_c2l(data, l);

            T1 = X[1] = l;

            ROUND_00_15(1, h, a, b, c, d, e, f, g);

            (void)HOST_c2l(data, l);

            T1 = X[2] = l;

            ROUND_00_15(2, g, h, a, b, c, d, e, f);

            (void)HOST_c2l(data, l);

            T1 = X[3] = l;

            ROUND_00_15(3, f, g, h, a, b, c, d, e);

            (void)HOST_c2l(data, l);

            T1 = X[4] = l;

            ROUND_00_15(4, e, f, g, h, a, b, c, d);

            (void)HOST_c2l(data, l);

            T1 = X[5] = l;

            ROUND_00_15(5, d, e, f, g, h, a, b, c);

            (void)HOST_c2l(data, l);

            T1 = X[6] = l;

            ROUND_00_15(6, c, d, e, f, g, h, a, b);

            (void)HOST_c2l(data, l);

            T1 = X[7] = l;

            ROUND_00_15(7, b, c, d, e, f, g, h, a);

            (void)HOST_c2l(data, l);

            T1 = X[8] = l;

            ROUND_00_15(8, a, b, c, d, e, f, g, h);

            (void)HOST_c2l(data, l);

            T1 = X[9] = l;

            ROUND_00_15(9, h, a, b, c, d, e, f, g);

            (void)HOST_c2l(data, l);

            T1 = X[10] = l;

            ROUND_00_15(10, g, h, a, b, c, d, e, f);

            (void)HOST_c2l(data, l);

            T1 = X[11] = l;

            ROUND_00_15(11, f, g, h, a, b, c, d, e);

            (void)HOST_c2l(data, l);

            T1 = X[12] = l;

            ROUND_00_15(12, e, f, g, h, a, b, c, d);

            (void)HOST_c2l(data, l);

            T1 = X[13] = l;

            ROUND_00_15(13, d, e, f, g, h, a, b, c);

            (void)HOST_c2l(data, l);

            T1 = X[14] = l;

            ROUND_00_15(14, c, d, e, f, g, h, a, b);

            (void)HOST_c2l(data, l);

            T1 = X[15] = l;

            ROUND_00_15(15, b, c, d, e, f, g, h, a);

        }

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

            ROUND_16_63(i + 0, a, b, c, d, e, f, g, h, X);

            ROUND_16_63(i + 1, h, a, b, c, d, e, f, g, X);

            ROUND_16_63(i + 2, g, h, a, b, c, d, e, f, X);

            ROUND_16_63(i + 3, f, g, h, a, b, c, d, e, X);

            ROUND_16_63(i + 4, e, f, g, h, a, b, c, d, X);

            ROUND_16_63(i + 5, d, e, f, g, h, a, b, c, X);

            ROUND_16_63(i + 6, c, d, e, f, g, h, a, b, X);

            ROUND_16_63(i + 7, b, c, d, e, f, g, h, a, X);

        }

        ctx->h[0] += a;

        ctx->h[1] += b;

        ctx->h[2] += c;

        ctx->h[3] += d;

        ctx->h[4] += e;

        ctx->h[5] += f;

        ctx->h[6] += g;

        ctx->h[7] += h;

    }

}

#endif

#endif /* SHA256_ASM */