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      1 /* ppp-crypto.h - Generic API for access to crypto/digest functions.
      2  *
      3  * Copyright (c) 2022 Eivind Nss. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  *
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in
     14  *    the documentation and/or other materials provided with the
     15  *    distribution.
     16  *
     17  * 3. The name(s) of the authors of this software must not be used to
     18  *    endorse or promote products derived from this software without
     19  *    prior written permission.
     20  *
     21  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
     22  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
     23  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
     24  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     25  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
     26  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
     27  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     28  */
     29 
     30 #ifndef PPP_CRYPTO_H
     31 #define PPP_CRYPTO_H
     32 
     33 #ifdef __cplusplus
     34 extern "C" {
     35 #endif
     36 
     37 #ifndef MD5_DIGEST_LENGTH
     38 #define MD5_DIGEST_LENGTH 16
     39 #endif
     40 
     41 #ifndef MD4_DIGEST_LENGTH
     42 #define MD4_DIGEST_LENGTH 16
     43 #endif
     44 
     45 #ifndef SHA_DIGEST_LENGTH
     46 #define SHA_DIGEST_LENGTH 20
     47 #endif
     48 
     49 struct _PPP_MD_CTX;
     50 struct _PPP_MD;
     51 
     52 typedef struct _PPP_MD_CTX PPP_MD_CTX;
     53 typedef struct _PPP_MD PPP_MD;
     54 
     55 /*
     56  * Create a new Message Digest context object
     57  */
     58 PPP_MD_CTX *PPP_MD_CTX_new(void);
     59 
     60 /*
     61  * Free the Message Digest context
     62  */
     63 void PPP_MD_CTX_free(PPP_MD_CTX*);
     64 
     65 /*
     66  * Fetch the MD4 algorithm
     67  */
     68 const PPP_MD *PPP_md4(void);
     69 
     70 /*
     71  * Fetch the MD5 algorithm
     72  */
     73 const PPP_MD *PPP_md5(void);
     74 
     75 /*
     76  * Fetch the SHA1 algorithm
     77  */
     78 const PPP_MD *PPP_sha1(void);
     79 
     80 /*
     81  * Initializes a context object
     82  */
     83 int PPP_DigestInit(PPP_MD_CTX *ctx,
     84         const PPP_MD *type);
     85 
     86 /*
     87  * For each iteration update the context with more input
     88  */
     89 int PPP_DigestUpdate(PPP_MD_CTX *ctx,
     90         const void *data, size_t cnt);
     91 
     92 /*
     93  * Perform the final operation, and output the digest
     94  */
     95 int PPP_DigestFinal(PPP_MD_CTX *ctx,
     96         unsigned char *out, unsigned int *outlen);
     97 
     98 
     99 struct _PPP_CIPHER_CTX;
    100 struct _PPP_CIPHER;
    101 
    102 typedef struct _PPP_CIPHER_CTX PPP_CIPHER_CTX;
    103 typedef struct _PPP_CIPHER PPP_CIPHER;
    104 
    105 
    106 /*
    107  * Create a new Cipher Context
    108  */
    109 PPP_CIPHER_CTX *PPP_CIPHER_CTX_new(void);
    110 
    111 /*
    112  * Release the Cipher Context
    113  */
    114 void PPP_CIPHER_CTX_free(PPP_CIPHER_CTX *ctx);
    115 
    116 /*
    117  * Fetch the DES in ECB mode cipher algorithm
    118  */
    119 const PPP_CIPHER *PPP_des_ecb(void);
    120 
    121 /*
    122  * Set the particular data directly
    123  */
    124 void PPP_CIPHER_CTX_set_cipher_data(PPP_CIPHER_CTX *ctx,
    125         const unsigned char *key);
    126 
    127 /*
    128  * Initialize the crypto operation
    129  */
    130 int PPP_CipherInit(PPP_CIPHER_CTX *ctx,
    131         const PPP_CIPHER *cipher,
    132         const unsigned char *key,
    133         const unsigned char *iv,
    134         int encr);
    135 
    136 /*
    137  * Encrypt input data, and store it in the output buffer
    138  */
    139 int PPP_CipherUpdate(PPP_CIPHER_CTX *ctx,
    140         unsigned char *out, int *outl,
    141         const unsigned char *in, int inl);
    142 
    143 /*
    144  * Finish the crypto operation, and fetch any outstanding bytes
    145  */
    146 int PPP_CipherFinal(PPP_CIPHER_CTX *ctx,
    147         unsigned char *out, int *outl);
    148 
    149 /*
    150  * Log an error message to the log and append the crypto error
    151  */
    152 void PPP_crypto_error(char *fmt, ...);
    153 
    154 /*
    155  * Global initialization, must be called once per process
    156  */
    157 int PPP_crypto_init(void);
    158 
    159 /*
    160  * Global deinitialization
    161  */
    162 int PPP_crypto_deinit(void);
    163 
    164 #ifdef __cplusplus
    165 }
    166 #endif
    167 
    168 #endif // PPP_CRYPTO_H
    169