crypt.h

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// Copyright (C) 2004-2025 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
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// any later version.
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// MuPDF 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 Affero General Public License for more
// details.
//
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// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
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// CA 94129, USA, for further information.
 
#ifndef MUPDF_FITZ_CRYPT_H
#define MUPDF_FITZ_CRYPT_H
 
#include "mupdf/fitz/system.h"
 
/* md5 digests */

typedef struct
{
    uint32_t lo, hi;
    uint32_t a, b, c, d;
    unsigned char buffer[64];
} fz_md5;

void fz_md5_init(fz_md5 *state);

void fz_md5_update(fz_md5 *state, const unsigned char *input, size_t inlen);

void fz_md5_update_int64(fz_md5 *state, int64_t i);

void fz_md5_final(fz_md5 *state, unsigned char digest[16]);
 
/* sha-256 digests */

typedef struct
{
    unsigned int state[8];
    unsigned int count[2];
    union {
        unsigned char u8[64];
        unsigned int u32[16];
    } buffer;
} fz_sha256;

void fz_sha256_init(fz_sha256 *state);

void fz_sha256_update(fz_sha256 *state, const unsigned char *input, size_t inlen);

void fz_sha256_final(fz_sha256 *state, unsigned char digest[32]);
 
/* sha-512 digests */

typedef struct
{
    uint64_t state[8];
    unsigned int count[2];
    union {
        unsigned char u8[128];
        uint64_t u64[16];
    } buffer;
} fz_sha512;

void fz_sha512_init(fz_sha512 *state);

void fz_sha512_update(fz_sha512 *state, const unsigned char *input, size_t inlen);

void fz_sha512_final(fz_sha512 *state, unsigned char digest[64]);
 
/* sha-384 digests */
 
typedef fz_sha512 fz_sha384;

void fz_sha384_init(fz_sha384 *state);

void fz_sha384_update(fz_sha384 *state, const unsigned char *input, size_t inlen);

void fz_sha384_final(fz_sha384 *state, unsigned char digest[64]);
 
/* arc4 crypto */

typedef struct
{
    unsigned x;
    unsigned y;
    unsigned char state[256];
} fz_arc4;

void fz_arc4_init(fz_arc4 *state, const unsigned char *key, size_t len);

void fz_arc4_encrypt(fz_arc4 *state, unsigned char *dest, const unsigned char *src, size_t len);

void fz_arc4_final(fz_arc4 *state);
 
/* AES block cipher implementation from XYSSL */

typedef struct
{
    int nr; /* number of rounds */
    uint32_t *rk; /* AES round keys */
    uint32_t buf[68]; /* unaligned data */
} fz_aes;
 
#define FZ_AES_DECRYPT 0
#define FZ_AES_ENCRYPT 1

int fz_aes_setkey_enc(fz_aes *ctx, const unsigned char *key, int keysize);

int fz_aes_setkey_dec(fz_aes *ctx, const unsigned char *key, int keysize);

void fz_aes_crypt_cbc(fz_aes *ctx, int mode, size_t length,
    unsigned char iv[16],
    const unsigned char *input,
    unsigned char *output );
 
#endif