149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/* $OpenBSD: digest.c,v 1.2 2014/01/17 05:26:41 dtucker Exp $ */
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/*
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* Copyright (c) 2013 Damien Miller <djm@mindrot.org>
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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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#include "includes.h"
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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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#include <openssl/evp.h>
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#include "openbsd-compat/openssl-compat.h"
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#include "buffer.h"
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#include "digest.h"
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struct ssh_digest_ctx {
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int alg;
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EVP_MD_CTX mdctx;
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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 digest_len;
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const EVP_MD *(*mdfunc)(void);
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};
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/* NB. Indexed directly by algorithm number */
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const struct ssh_digest digests[] = {
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{ SSH_DIGEST_MD5, "MD5", 16, EVP_md5 },
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{ SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 },
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{ SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 },
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#ifdef HAVE_EVP_SHA256 /* XXX replace with local if missing */
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{ SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 },
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{ SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 },
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{ SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 },
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#endif
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{ -1, NULL, 0, NULL },
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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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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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return digest == NULL ? 0 : digest->digest_len;
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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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if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
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return NULL;
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ret->alg = alg;
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EVP_MD_CTX_init(&ret->mdctx);
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if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
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free(ret);
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return NULL;
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}
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return ret;
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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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if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
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return -1;
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return 0;
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}
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int
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ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
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{
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return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b));
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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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u_int l = dlen;
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if (dlen > UINT_MAX)
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return -1;
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if (dlen < digest->digest_len) /* No truncation allowed */
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return -1;
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if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
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return -1;
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if (l != digest->digest_len) /* sanity */
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return -1;
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return 0;
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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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EVP_MD_CTX_cleanup(&ctx->mdctx);
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memset(ctx, 0, sizeof(*ctx));
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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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if (ctx == NULL)
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return -1;
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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 -1;
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ssh_digest_free(ctx);
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return 0;
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}
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int
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ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
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{
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return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);
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}
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