1/* $OpenBSD: digest.h,v 1.8 2017/05/08 22:57:38 djm Exp $ */ 2/* 3 * Copyright (c) 2013 Damien Miller <djm@mindrot.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#ifndef _DIGEST_H 19#define _DIGEST_H 20 21/* Maximum digest output length */ 22#define SSH_DIGEST_MAX_LENGTH 64 23 24/* Digest algorithms */ 25#define SSH_DIGEST_MD5 0 26#define SSH_DIGEST_SHA1 1 27#define SSH_DIGEST_SHA256 2 28#define SSH_DIGEST_SHA384 3 29#define SSH_DIGEST_SHA512 4 30#define SSH_DIGEST_MAX 5 31 32struct sshbuf; 33struct ssh_digest_ctx; 34 35/* Looks up a digest algorithm by name */ 36int ssh_digest_alg_by_name(const char *name); 37 38/* Returns the algorithm name for a digest identifier */ 39const char *ssh_digest_alg_name(int alg); 40 41/* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */ 42size_t ssh_digest_bytes(int alg); 43 44/* Returns the block size of the digest, e.g. for implementing HMAC */ 45size_t ssh_digest_blocksize(struct ssh_digest_ctx *ctx); 46 47/* Copies internal state of digest of 'from' to 'to' */ 48int ssh_digest_copy_state(struct ssh_digest_ctx *from, 49 struct ssh_digest_ctx *to); 50 51/* One-shot API */ 52int ssh_digest_memory(int alg, const void *m, size_t mlen, 53 u_char *d, size_t dlen) 54 __attribute__((__bounded__(__buffer__, 2, 3))) 55 __attribute__((__bounded__(__buffer__, 4, 5))); 56int ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen) 57 __attribute__((__bounded__(__buffer__, 3, 4))); 58 59/* Update API */ 60struct ssh_digest_ctx *ssh_digest_start(int alg); 61int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) 62 __attribute__((__bounded__(__buffer__, 2, 3))); 63int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, 64 const struct sshbuf *b); 65int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) 66 __attribute__((__bounded__(__buffer__, 2, 3))); 67void ssh_digest_free(struct ssh_digest_ctx *ctx); 68 69#endif /* _DIGEST_H */ 70 71