1 /* $OpenBSD: digest.h,v 1.7 2014/12/21 22:27:56 djm Exp $ */ 2 /* 3 * Copyright (c) 2013 Damien Miller <djm (at) 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 sshbuf; 34 struct ssh_digest_ctx; 35 36 /* Looks up a digest algorithm by name */ 37 int ssh_digest_alg_by_name(const char *name); 38 39 /* Returns the algorithm name for a digest identifier */ 40 const char *ssh_digest_alg_name(int alg); 41 42 /* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */ 43 size_t ssh_digest_bytes(int alg); 44 45 /* Returns the block size of the digest, e.g. for implementing HMAC */ 46 size_t ssh_digest_blocksize(struct ssh_digest_ctx *ctx); 47 48 /* Copies internal state of digest of 'from' to 'to' */ 49 int ssh_digest_copy_state(struct ssh_digest_ctx *from, 50 struct ssh_digest_ctx *to); 51 52 /* One-shot API */ 53 int ssh_digest_memory(int alg, const void *m, size_t mlen, 54 u_char *d, size_t dlen) 55 __attribute__((__bounded__(__buffer__, 2, 3))) 56 __attribute__((__bounded__(__buffer__, 4, 5))); 57 int ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen) 58 __attribute__((__bounded__(__buffer__, 3, 4))); 59 60 /* Update API */ 61 struct ssh_digest_ctx *ssh_digest_start(int alg); 62 int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) 63 __attribute__((__bounded__(__buffer__, 2, 3))); 64 int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, 65 const struct sshbuf *b); 66 int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) 67 __attribute__((__bounded__(__buffer__, 2, 3))); 68 void ssh_digest_free(struct ssh_digest_ctx *ctx); 69 70 #endif /* _DIGEST_H */ 71 72
