1 /* $OpenBSD: digest.h,v 1.2 2014/01/27 18:58:14 markus 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_RIPEMD160 1 27 #define SSH_DIGEST_SHA1 2 28 #define SSH_DIGEST_SHA256 3 29 #define SSH_DIGEST_SHA384 4 30 #define SSH_DIGEST_SHA512 5 31 #define SSH_DIGEST_MAX 6 32 33 struct ssh_digest_ctx; 34 35 /* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */ 36 size_t ssh_digest_bytes(int alg); 37 38 /* Returns the block size of the digest, e.g. for implementing HMAC */ 39 size_t ssh_digest_blocksize(struct ssh_digest_ctx *ctx); 40 41 /* Copies internal state of digest of 'from' to 'to' */ 42 int ssh_digest_copy_state(struct ssh_digest_ctx *from, 43 struct ssh_digest_ctx *to); 44 45 /* One-shot API */ 46 int ssh_digest_memory(int alg, const void *m, size_t mlen, 47 u_char *d, size_t dlen) 48 __attribute__((__bounded__(__buffer__, 2, 3))) 49 __attribute__((__bounded__(__buffer__, 4, 5))); 50 int ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen) 51 __attribute__((__bounded__(__buffer__, 3, 4))); 52 53 /* Update API */ 54 struct ssh_digest_ctx *ssh_digest_start(int alg); 55 int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) 56 __attribute__((__bounded__(__buffer__, 2, 3))); 57 int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b); 58 int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) 59 __attribute__((__bounded__(__buffer__, 2, 3))); 60 void ssh_digest_free(struct ssh_digest_ctx *ctx); 61 62 #endif /* _DIGEST_H */ 63 64