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/**
@file rexmpp_digest.h
@brief Cryptographic functions
@author defanor <defanor@uberspace.net>
@date 2023
@copyright MIT license.
*/
#ifndef REXMPP_DIGEST_H
#define REXMPP_DIGEST_H
typedef enum {
REXMPP_DIGEST_SHA1,
REXMPP_DIGEST_SHA256,
REXMPP_DIGEST_SHA3_256
} rexmpp_digest_algorithm;
#if defined(HAVE_GCRYPT)
#include <gcrypt.h>
typedef gcry_md_hd_t rexmpp_digest_t;
#elif defined(HAVE_NETTLE)
#include <nettle/nettle-meta.h>
struct rexmpp_digest {
const struct nettle_hash *nh;
void *nh_ctx;
};
typedef struct rexmpp_digest rexmpp_digest_t;
#elif defined(HAVE_OPENSSL)
#include <openssl/evp.h>
typedef EVP_MD_CTX* rexmpp_digest_t;
#endif
/**
@brief Finds the digest length for a given algorithm.
@param[in] algo An algorithm.
@returns Digest length in bytes.
*/
size_t rexmpp_digest_len (rexmpp_digest_algorithm algo);
/**
@brief Computes a digest for a buffer.
@param[in] algo An algorithm.
@param[in] in Input data.
@param[in] in_len Input data length.
@param[out] out Output buffer.
@param[in] out_len Output buffer length.
@returns 0 on success, non-zero on failure.
*/
int rexmpp_digest_buffer (rexmpp_digest_algorithm algo,
const void *in,
size_t in_len,
void *out,
size_t out_len);
/**
@brief Initializes a digest context.
@param[out] ctx Pointer to an allocated ::rexmpp_digest_t context
to initialize.
@param[in] algo An algorithm to use.
@returns 0 on success, non-zero on failure.
*/
int rexmpp_digest_init (rexmpp_digest_t *ctx, rexmpp_digest_algorithm algo);
/**
@brief Updates a digest computation.
@param[in,out] ctx Context pointer.
@param[in] in Input data.
@param[in] len Length of the input buffer.
@returns 0 on success, non-zero on failure.
*/
int rexmpp_digest_update (rexmpp_digest_t *ctx, const void *in, size_t len);
/**
@brief Finishes a digest computation, freeing the context and
providing the output.
@param[in,out] ctx Context pointer.
@param[out] out A place to write the computed digest into, can be
NULL to just free the context.
@param[in] len Length of the allocated output buffer.
@returns 0 on success, non-zero on failure.
*/
int rexmpp_digest_finish (rexmpp_digest_t *ctx, void *out, size_t len);
#endif
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