1 /* $OpenBSD: digest.c,v 1.3 2014/01/20 00:08:48 djm Exp $ */
3 * Copyright (c) 2013 Damien Miller <djm@mindrot.org>
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.
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.
20 #include <sys/types.h>
25 #include <openssl/evp.h>
27 #include "openbsd-compat/openssl-compat.h"
32 struct ssh_digest_ctx {
41 const EVP_MD *(*mdfunc)(void);
44 /* NB. Indexed directly by algorithm number */
45 const struct ssh_digest digests[] = {
46 { SSH_DIGEST_MD5, "MD5", 16, EVP_md5 },
47 { SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 },
48 { SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 },
49 #ifdef HAVE_EVP_SHA256 /* XXX replace with local if missing */
50 { SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 },
51 { SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 },
52 { SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 },
54 { -1, NULL, 0, NULL },
57 static const struct ssh_digest *
58 ssh_digest_by_alg(int alg)
60 if (alg < 0 || alg >= SSH_DIGEST_MAX)
62 if (digests[alg].id != alg) /* sanity */
64 return &(digests[alg]);
68 ssh_digest_bytes(int alg)
70 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
72 return digest == NULL ? 0 : digest->digest_len;
75 struct ssh_digest_ctx *
76 ssh_digest_start(int alg)
78 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
79 struct ssh_digest_ctx *ret;
81 if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
84 EVP_MD_CTX_init(&ret->mdctx);
85 if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
93 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
95 if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
101 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
103 return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b));
107 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
109 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
114 if (dlen < digest->digest_len) /* No truncation allowed */
116 if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
118 if (l != digest->digest_len) /* sanity */
124 ssh_digest_free(struct ssh_digest_ctx *ctx)
126 EVP_MD_CTX_cleanup(&ctx->mdctx);
127 memset(ctx, 0, sizeof(*ctx));
132 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
134 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
138 if (ssh_digest_update(ctx, m, mlen) != 0 ||
139 ssh_digest_final(ctx, d, dlen) != 0)
141 ssh_digest_free(ctx);
146 ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
148 return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);