1*52769410Sdjm /* $OpenBSD: digest.h,v 1.8 2017/05/08 22:57:38 djm Exp $ */ 28df5df93Sdjm /* 38df5df93Sdjm * Copyright (c) 2013 Damien Miller <djm@mindrot.org> 48df5df93Sdjm * 58df5df93Sdjm * Permission to use, copy, modify, and distribute this software for any 68df5df93Sdjm * purpose with or without fee is hereby granted, provided that the above 78df5df93Sdjm * copyright notice and this permission notice appear in all copies. 88df5df93Sdjm * 98df5df93Sdjm * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 108df5df93Sdjm * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 118df5df93Sdjm * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 128df5df93Sdjm * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 138df5df93Sdjm * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 148df5df93Sdjm * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 158df5df93Sdjm * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 168df5df93Sdjm */ 178df5df93Sdjm 188df5df93Sdjm #ifndef _DIGEST_H 198df5df93Sdjm #define _DIGEST_H 208df5df93Sdjm 218df5df93Sdjm /* Maximum digest output length */ 228df5df93Sdjm #define SSH_DIGEST_MAX_LENGTH 64 238df5df93Sdjm 248df5df93Sdjm /* Digest algorithms */ 258df5df93Sdjm #define SSH_DIGEST_MD5 0 26*52769410Sdjm #define SSH_DIGEST_SHA1 1 27*52769410Sdjm #define SSH_DIGEST_SHA256 2 28*52769410Sdjm #define SSH_DIGEST_SHA384 3 29*52769410Sdjm #define SSH_DIGEST_SHA512 4 30*52769410Sdjm #define SSH_DIGEST_MAX 5 318df5df93Sdjm 3297a43512Sdjm struct sshbuf; 33f7baae32Smarkus struct ssh_digest_ctx; 34f7baae32Smarkus 353dbedef4Sdjm /* Looks up a digest algorithm by name */ 363dbedef4Sdjm int ssh_digest_alg_by_name(const char *name); 373dbedef4Sdjm 383dbedef4Sdjm /* Returns the algorithm name for a digest identifier */ 393dbedef4Sdjm const char *ssh_digest_alg_name(int alg); 403dbedef4Sdjm 418df5df93Sdjm /* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */ 428df5df93Sdjm size_t ssh_digest_bytes(int alg); 438df5df93Sdjm 44f7baae32Smarkus /* Returns the block size of the digest, e.g. for implementing HMAC */ 45f7baae32Smarkus size_t ssh_digest_blocksize(struct ssh_digest_ctx *ctx); 46f7baae32Smarkus 47f7baae32Smarkus /* Copies internal state of digest of 'from' to 'to' */ 48f7baae32Smarkus int ssh_digest_copy_state(struct ssh_digest_ctx *from, 49f7baae32Smarkus struct ssh_digest_ctx *to); 50f7baae32Smarkus 518df5df93Sdjm /* One-shot API */ 528df5df93Sdjm int ssh_digest_memory(int alg, const void *m, size_t mlen, 538df5df93Sdjm u_char *d, size_t dlen) 5437ec574aSdjm __attribute__((__bounded__(__buffer__, 2, 3))) 5537ec574aSdjm __attribute__((__bounded__(__buffer__, 4, 5))); 56ea2d8289Sdjm int ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen) 5737ec574aSdjm __attribute__((__bounded__(__buffer__, 3, 4))); 588df5df93Sdjm 598df5df93Sdjm /* Update API */ 608df5df93Sdjm struct ssh_digest_ctx *ssh_digest_start(int alg); 618df5df93Sdjm int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) 6237ec574aSdjm __attribute__((__bounded__(__buffer__, 2, 3))); 63ea2d8289Sdjm int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, 64ea2d8289Sdjm const struct sshbuf *b); 658df5df93Sdjm int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) 6637ec574aSdjm __attribute__((__bounded__(__buffer__, 2, 3))); 678df5df93Sdjm void ssh_digest_free(struct ssh_digest_ctx *ctx); 688df5df93Sdjm 698df5df93Sdjm #endif /* _DIGEST_H */ 708df5df93Sdjm 71