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/*
* checksum.h
*
* Copyright (c) 2008- Steve McIntyre <steve@einval.com>
*
* Definitions and prototypes for a generic checksum interface, used
* in JTE. Inspired heavily by the interface to the MD5 code we're
* using already.
*
* GNU GPL v2
*/
enum checksum_types
{
CHECK_MD5 = 0,
CHECK_SHA1,
CHECK_SHA256,
CHECK_SHA512,
NUM_CHECKSUMS
};
#define CHECK_MD5_USED (1 << CHECK_MD5)
#define CHECK_SHA1_USED (1 << CHECK_SHA1)
#define CHECK_SHA256_USED (1 << CHECK_SHA256)
#define CHECK_SHA512_USED (1 << CHECK_SHA512)
#define CHECK_ALL_USED 0xFFFFFFFF
typedef void checksum_context_t;
struct checksum_info
{
char *name;
char *prog;
int digest_size;
};
/* Ask the library for information about a particular checksum
* algorithm. Returns a pointer to internal memory - DO NOT
* MODIFY/FREE! */
struct checksum_info *checksum_information(enum checksum_types which);
/* Allocate / initialise a context for the chosen checksums. OR
* together the desired checksums as the parameter */
checksum_context_t *checksum_init_context(int checksums, const char *owner);
/* Cleanup and free a context when it's finished with */
void checksum_free_context(checksum_context_t *context);
/* Pass a new buffer full of data through the checksum code */
void checksum_update(checksum_context_t *context,
unsigned char const *buf,
unsigned int len);
/* Finish the current set of checksums */
void checksum_final(checksum_context_t *context);
/* Extract a particular algorithm's checksum once checksum_final() has
* been called. Use the details in checksum_information() above first
* to see how big the digest will be. Only valid once checksum_final()
* has been called, otherwise the digest returned will be all
* zeroes. */
void checksum_copy(checksum_context_t *context,
enum checksum_types which,
unsigned char *digest);
/* Helper function: return a pointer to a string containing the ASCII
* hexadecimal dump of a checksum. Only valid once checksum_final()
* has been called, otherwise will return NULL */
const char * checksum_hex(checksum_context_t *context,
enum checksum_types which);
extern int parse_checksum_algo(char *arg,
int *algo);
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