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/* $OpenBSD: digest-libc.c,v 1.6 2017/05/08 22:57:38 djm Exp $ */ |
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/* |
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* Copyright (c) 2013 Damien Miller <djm@mindrot.org> |
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* Copyright (c) 2014 Markus Friedl. All rights reserved. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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|
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#include "includes.h" |
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|
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#ifndef WITH_OPENSSL |
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|
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#include <sys/types.h> |
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#include <limits.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#if 0 |
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#include <md5.h> |
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#include <rmd160.h> |
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#include <sha1.h> |
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#include <sha2.h> |
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#endif |
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|
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#include "ssherr.h" |
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#include "sshbuf.h" |
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#include "digest.h" |
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|
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typedef void md_init_fn(void *mdctx); |
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typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen); |
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typedef void md_final_fn(u_int8_t[], void *mdctx); |
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|
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struct ssh_digest_ctx { |
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int alg; |
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void *mdctx; |
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}; |
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|
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struct ssh_digest { |
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int id; |
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const char *name; |
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size_t block_len; |
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size_t digest_len; |
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size_t ctx_len; |
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md_init_fn *md_init; |
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md_update_fn *md_update; |
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md_final_fn *md_final; |
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}; |
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|
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/* NB. Indexed directly by algorithm number */ |
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const struct ssh_digest digests[SSH_DIGEST_MAX] = { |
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{ |
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SSH_DIGEST_MD5, |
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"MD5", |
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MD5_BLOCK_LENGTH, |
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MD5_DIGEST_LENGTH, |
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sizeof(MD5_CTX), |
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(md_init_fn *) MD5Init, |
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(md_update_fn *) MD5Update, |
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(md_final_fn *) MD5Final |
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}, |
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{ |
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SSH_DIGEST_SHA1, |
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"SHA1", |
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SHA1_BLOCK_LENGTH, |
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SHA1_DIGEST_LENGTH, |
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sizeof(SHA1_CTX), |
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(md_init_fn *) SHA1Init, |
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(md_update_fn *) SHA1Update, |
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(md_final_fn *) SHA1Final |
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}, |
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{ |
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SSH_DIGEST_SHA256, |
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"SHA256", |
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SHA256_BLOCK_LENGTH, |
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SHA256_DIGEST_LENGTH, |
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sizeof(SHA256_CTX), |
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(md_init_fn *) SHA256_Init, |
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(md_update_fn *) SHA256_Update, |
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(md_final_fn *) SHA256_Final |
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}, |
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{ |
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SSH_DIGEST_SHA384, |
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"SHA384", |
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SHA384_BLOCK_LENGTH, |
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SHA384_DIGEST_LENGTH, |
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sizeof(SHA384_CTX), |
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(md_init_fn *) SHA384_Init, |
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(md_update_fn *) SHA384_Update, |
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(md_final_fn *) SHA384_Final |
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}, |
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{ |
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SSH_DIGEST_SHA512, |
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"SHA512", |
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SHA512_BLOCK_LENGTH, |
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SHA512_DIGEST_LENGTH, |
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sizeof(SHA512_CTX), |
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(md_init_fn *) SHA512_Init, |
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(md_update_fn *) SHA512_Update, |
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(md_final_fn *) SHA512_Final |
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} |
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}; |
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|
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static const struct ssh_digest * |
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ssh_digest_by_alg(int alg) |
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{ |
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if (alg < 0 || alg >= SSH_DIGEST_MAX) |
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return NULL; |
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if (digests[alg].id != alg) /* sanity */ |
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return NULL; |
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return &(digests[alg]); |
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} |
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|
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int |
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ssh_digest_alg_by_name(const char *name) |
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{ |
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int alg; |
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|
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for (alg = 0; alg < SSH_DIGEST_MAX; alg++) { |
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if (strcasecmp(name, digests[alg].name) == 0) |
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return digests[alg].id; |
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} |
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return -1; |
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} |
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|
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const char * |
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ssh_digest_alg_name(int alg) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
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|
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return digest == NULL ? NULL : digest->name; |
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} |
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|
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size_t |
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ssh_digest_bytes(int alg) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
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|
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return digest == NULL ? 0 : digest->digest_len; |
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} |
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|
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size_t |
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ssh_digest_blocksize(struct ssh_digest_ctx *ctx) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
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|
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return digest == NULL ? 0 : digest->block_len; |
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} |
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|
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struct ssh_digest_ctx * |
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ssh_digest_start(int alg) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
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struct ssh_digest_ctx *ret; |
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|
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if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL) |
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return NULL; |
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if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) { |
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free(ret); |
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return NULL; |
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} |
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ret->alg = alg; |
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digest->md_init(ret->mdctx); |
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return ret; |
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} |
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|
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int |
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ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(from->alg); |
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|
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if (digest == NULL || from->alg != to->alg) |
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return SSH_ERR_INVALID_ARGUMENT; |
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memcpy(to->mdctx, from->mdctx, digest->ctx_len); |
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return 0; |
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} |
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|
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int |
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ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
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|
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if (digest == NULL) |
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return SSH_ERR_INVALID_ARGUMENT; |
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digest->md_update(ctx->mdctx, m, mlen); |
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return 0; |
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} |
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|
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int |
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ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b) |
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{ |
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return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b)); |
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} |
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|
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int |
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ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
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|
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if (digest == NULL) |
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return SSH_ERR_INVALID_ARGUMENT; |
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if (dlen > UINT_MAX) |
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return SSH_ERR_INVALID_ARGUMENT; |
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if (dlen < digest->digest_len) /* No truncation allowed */ |
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return SSH_ERR_INVALID_ARGUMENT; |
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digest->md_final(d, ctx->mdctx); |
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return 0; |
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} |
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|
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void |
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ssh_digest_free(struct ssh_digest_ctx *ctx) |
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{ |
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const struct ssh_digest *digest; |
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|
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if (ctx != NULL) { |
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digest = ssh_digest_by_alg(ctx->alg); |
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if (digest) { |
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explicit_bzero(ctx->mdctx, digest->ctx_len); |
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free(ctx->mdctx); |
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explicit_bzero(ctx, sizeof(*ctx)); |
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free(ctx); |
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} |
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} |
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} |
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|
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int |
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ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen) |
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{ |
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struct ssh_digest_ctx *ctx = ssh_digest_start(alg); |
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|
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if (ctx == NULL) |
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return SSH_ERR_INVALID_ARGUMENT; |
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if (ssh_digest_update(ctx, m, mlen) != 0 || |
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ssh_digest_final(ctx, d, dlen) != 0) |
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return SSH_ERR_INVALID_ARGUMENT; |
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ssh_digest_free(ctx); |
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return 0; |
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} |
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|
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int |
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ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen) |
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{ |
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return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen); |
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} |
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#endif /* !WITH_OPENSSL */ |
