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/* ppp-crypto.h - Generic API for access to crypto/digest functions.
*
* Copyright (c) 2022 Eivind Næss. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef PPP_CRYPTO_H
#define PPP_CRYPTO_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef MD5_DIGEST_LENGTH
#define MD5_DIGEST_LENGTH 16
#endif
#ifndef MD4_DIGEST_LENGTH
#define MD4_DIGEST_LENGTH 16
#endif
#ifndef SHA_DIGEST_LENGTH
#define SHA_DIGEST_LENGTH 20
#endif
struct _PPP_MD_CTX;
struct _PPP_MD;
typedef struct _PPP_MD_CTX PPP_MD_CTX;
typedef struct _PPP_MD PPP_MD;
/*
* Create a new Message Digest context object
*/
PPP_MD_CTX *PPP_MD_CTX_new();
/*
* Free the Message Digest context
*/
void PPP_MD_CTX_free(PPP_MD_CTX*);
/*
* Fetch the MD4 algorithm
*/
const PPP_MD *PPP_md4(void);
/*
* Fetch the MD5 algorithm
*/
const PPP_MD *PPP_md5(void);
/*
* Fetch the SHA1 algorithm
*/
const PPP_MD *PPP_sha1(void);
/*
* Initializes a context object
*/
int PPP_DigestInit(PPP_MD_CTX *ctx,
const PPP_MD *type);
/*
* For each iteration update the context with more input
*/
int PPP_DigestUpdate(PPP_MD_CTX *ctx,
const void *data, size_t cnt);
/*
* Perform the final operation, and output the digest
*/
int PPP_DigestFinal(PPP_MD_CTX *ctx,
unsigned char *out, unsigned int *outlen);
struct _PPP_CIPHER_CTX;
struct _PPP_CIPHER;
typedef struct _PPP_CIPHER_CTX PPP_CIPHER_CTX;
typedef struct _PPP_CIPHER PPP_CIPHER;
/*
* Create a new Cipher Context
*/
PPP_CIPHER_CTX *PPP_CIPHER_CTX_new(void);
/*
* Release the Cipher Context
*/
void PPP_CIPHER_CTX_free(PPP_CIPHER_CTX *ctx);
/*
* Fetch the DES in ECB mode cipher algorithm
*/
const PPP_CIPHER *PPP_des_ecb(void);
/*
* Set the particular data directly
*/
void PPP_CIPHER_CTX_set_cipher_data(PPP_CIPHER_CTX *ctx,
const unsigned char *key);
/*
* Initialize the crypto operation
*/
int PPP_CipherInit(PPP_CIPHER_CTX *ctx,
const PPP_CIPHER *cipher,
const unsigned char *key,
const unsigned char *iv,
int encr);
/*
* Encrypt input data, and store it in the output buffer
*/
int PPP_CipherUpdate(PPP_CIPHER_CTX *ctx,
unsigned char *out, int *outl,
const unsigned char *in, int inl);
/*
* Finish the crypto operation, and fetch any outstanding bytes
*/
int PPP_CipherFinal(PPP_CIPHER_CTX *ctx,
unsigned char *out, int *outl);
/*
* Global initialization, must be called once per process
*/
int PPP_crypto_init();
/*
* Global deinitialization
*/
int PPP_crypto_deinit();
#ifdef __cplusplus
}
#endif
#endif // PPP_CRYPTO_H
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