/*
 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright Ericsson AB 2023-2025. 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
 */

#include <stdlib.h>
#include <string.h>
#if defined(ERLANG_OPENSSL_INTEGRATION)
#include "openssl_local/md5.h"
#define md5_block_data_order MD5_BLOCK_DATA_ORDER_FUNCTION_NAME
#undef MD5_ASM
#else
#include <openssl/e_os2.h>
#include <openssl/md5.h>
#endif

#ifdef MD5_ASM
#if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) || defined(_M_X64) || defined(__aarch64__) || (defined(__loongarch__) && __loongarch_grlen == 64) || (defined(__riscv) && __riscv_xlen == 64)
#define md5_block_data_order ossl_md5_block_asm_data_order
#elif defined(__ia64) || defined(__ia64__) || defined(_M_IA64)
#define md5_block_data_order ossl_md5_block_asm_data_order
#elif defined(__sparc) || defined(__sparc__)
#define md5_block_data_order ossl_md5_block_asm_data_order
#endif
#endif

void md5_block_data_order(MD5_CTX *c, const void *p, size_t num);

#define DATA_ORDER_IS_LITTLE_ENDIAN

#define HASH_LONG MD5_LONG
#define HASH_CTX MD5_CTX
#define HASH_CBLOCK MD5_CBLOCK
#if defined(ERLANG_OPENSSL_INTEGRATION)
#define HASH_UPDATE    MD5_UPDATE_FUNCTION_NAME
#define HASH_TRANSFORM MD5_TRANSFORM_FUNCTION_NAME
#define HASH_FINAL     MD5_FINAL_FUNCTION_NAME
#else
#define HASH_UPDATE MD5_Update
#define HASH_TRANSFORM MD5_Transform
#define HASH_FINAL MD5_Final
#endif
#define HASH_MAKE_STRING(c, s)   \
    do {                         \
        unsigned long ll;        \
        ll = (c)->A;             \
        (void)HOST_l2c(ll, (s)); \
        ll = (c)->B;             \
        (void)HOST_l2c(ll, (s)); \
        ll = (c)->C;             \
        (void)HOST_l2c(ll, (s)); \
        ll = (c)->D;             \
        (void)HOST_l2c(ll, (s)); \
    } while (0)
#if defined(ERLANG_OPENSSL_INTEGRATION)
#define HASH_BLOCK_DATA_ORDER   MD5_BLOCK_DATA_ORDER_FUNCTION_NAME
#undef md5_block_data_order
#else
#define HASH_BLOCK_DATA_ORDER md5_block_data_order
#endif

#include "crypto/md32_common.h"

/*-
#define F(x,y,z)        (((x) & (y))  |  ((~(x)) & (z)))
#define G(x,y,z)        (((x) & (z))  |  ((y) & (~(z))))
*/

/*
 * As pointed out by Wei Dai, the above can be simplified to the code
 * below.  Wei attributes these optimizations to Peter Gutmann's
 * SHS code, and he attributes it to Rich Schroeppel.
 */
#define F(b, c, d) ((((c) ^ (d)) & (b)) ^ (d))
#define G(b, c, d) ((((b) ^ (c)) & (d)) ^ (c))
#define H(b, c, d) ((b) ^ (c) ^ (d))
#define I(b, c, d) (((~(d)) | (b)) ^ (c))

#define R0(a, b, c, d, k, s, t)              \
    {                                        \
        a += ((k) + (t) + F((b), (c), (d))); \
        a = ROTATE(a, s);                    \
        a += b;                              \
    };

#define R1(a, b, c, d, k, s, t)              \
    {                                        \
        a += ((k) + (t) + G((b), (c), (d))); \
        a = ROTATE(a, s);                    \
        a += b;                              \
    };

#define R2(a, b, c, d, k, s, t)              \
    {                                        \
        a += ((k) + (t) + H((b), (c), (d))); \
        a = ROTATE(a, s);                    \
        a += b;                              \
    };

#define R3(a, b, c, d, k, s, t)              \
    {                                        \
        a += ((k) + (t) + I((b), (c), (d))); \
        a = ROTATE(a, s);                    \
        a += b;                              \
    };
