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digest-libc.c
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digest-libc.c
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/* $OpenBSD: digest-libc.c,v 1.7 2020/02/26 13:40:09 jsg Exp $ */
/*
* Copyright (c) 2013 Damien Miller <djm@mindrot.org>
* Copyright (c) 2014 Markus Friedl. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#ifndef WITH_OPENSSL
#include <sys/types.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#if 0
#include <md5.h>
#include <rmd160.h>
#endif
#ifdef HAVE_SHA1_H
#include <sha1.h>
#endif
#ifdef HAVE_SHA2_H
#include <sha2.h>
#endif
#if !defined(SHA256_BLOCK_LENGTH) && defined(SHA256_HMAC_BLOCK_SIZE)
#define SHA256_BLOCK_LENGTH SHA256_HMAC_BLOCK_SIZE
#endif
#if !defined(SHA384_BLOCK_LENGTH) && defined(SHA512_HMAC_BLOCK_SIZE)
#define SHA384_BLOCK_LENGTH SHA512_HMAC_BLOCK_SIZE
#endif
#if !defined(SHA512_BLOCK_LENGTH) && defined(SHA512_HMAC_BLOCK_SIZE)
#define SHA512_BLOCK_LENGTH SHA512_HMAC_BLOCK_SIZE
#endif
#include "ssherr.h"
#include "sshbuf.h"
#include "digest.h"
typedef void md_init_fn(void *mdctx);
typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
typedef void md_final_fn(u_int8_t[], void *mdctx);
struct ssh_digest_ctx {
int alg;
void *mdctx;
};
struct ssh_digest {
int id;
const char *name;
size_t block_len;
size_t digest_len;
size_t ctx_len;
md_init_fn *md_init;
md_update_fn *md_update;
md_final_fn *md_final;
};
/* NB. Indexed directly by algorithm number */
const struct ssh_digest digests[SSH_DIGEST_MAX] = {
{
SSH_DIGEST_MD5,
"MD5",
MD5_BLOCK_LENGTH,
MD5_DIGEST_LENGTH,
sizeof(MD5_CTX),
(md_init_fn *) MD5Init,
(md_update_fn *) MD5Update,
(md_final_fn *) MD5Final
},
{
SSH_DIGEST_SHA1,
"SHA1",
SHA1_BLOCK_LENGTH,
SHA1_DIGEST_LENGTH,
sizeof(SHA1_CTX),
(md_init_fn *) SHA1Init,
(md_update_fn *) SHA1Update,
(md_final_fn *) SHA1Final
},
{
SSH_DIGEST_SHA256,
"SHA256",
SHA256_BLOCK_LENGTH,
SHA256_DIGEST_LENGTH,
sizeof(SHA2_CTX),
(md_init_fn *) SHA256Init,
(md_update_fn *) SHA256Update,
(md_final_fn *) SHA256Final
},
{
SSH_DIGEST_SHA384,
"SHA384",
SHA384_BLOCK_LENGTH,
SHA384_DIGEST_LENGTH,
sizeof(SHA2_CTX),
(md_init_fn *) SHA384Init,
(md_update_fn *) SHA384Update,
(md_final_fn *) SHA384Final
},
{
SSH_DIGEST_SHA512,
"SHA512",
SHA512_BLOCK_LENGTH,
SHA512_DIGEST_LENGTH,
sizeof(SHA2_CTX),
(md_init_fn *) SHA512Init,
(md_update_fn *) SHA512Update,
(md_final_fn *) SHA512Final
}
};
static const struct ssh_digest *
ssh_digest_by_alg(int alg)
{
if (alg < 0 || alg >= SSH_DIGEST_MAX)
return NULL;
if (digests[alg].id != alg) /* sanity */
return NULL;
return &(digests[alg]);
}
int
ssh_digest_alg_by_name(const char *name)
{
int alg;
for (alg = 0; alg < SSH_DIGEST_MAX; alg++) {
if (strcasecmp(name, digests[alg].name) == 0)
return digests[alg].id;
}
return -1;
}
const char *
ssh_digest_alg_name(int alg)
{
const struct ssh_digest *digest = ssh_digest_by_alg(alg);
return digest == NULL ? NULL : digest->name;
}
size_t
ssh_digest_bytes(int alg)
{
const struct ssh_digest *digest = ssh_digest_by_alg(alg);
return digest == NULL ? 0 : digest->digest_len;
}
size_t
ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
{
const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
return digest == NULL ? 0 : digest->block_len;
}
struct ssh_digest_ctx *
ssh_digest_start(int alg)
{
const struct ssh_digest *digest = ssh_digest_by_alg(alg);
struct ssh_digest_ctx *ret;
if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
return NULL;
if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
free(ret);
return NULL;
}
ret->alg = alg;
digest->md_init(ret->mdctx);
return ret;
}
int
ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
{
const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
if (digest == NULL || from->alg != to->alg)
return SSH_ERR_INVALID_ARGUMENT;
memcpy(to->mdctx, from->mdctx, digest->ctx_len);
return 0;
}
int
ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
{
const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
if (digest == NULL)
return SSH_ERR_INVALID_ARGUMENT;
digest->md_update(ctx->mdctx, m, mlen);
return 0;
}
int
ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
{
return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
}
int
ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
{
const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
if (digest == NULL)
return SSH_ERR_INVALID_ARGUMENT;
if (dlen > UINT_MAX)
return SSH_ERR_INVALID_ARGUMENT;
if (dlen < digest->digest_len) /* No truncation allowed */
return SSH_ERR_INVALID_ARGUMENT;
digest->md_final(d, ctx->mdctx);
return 0;
}
void
ssh_digest_free(struct ssh_digest_ctx *ctx)
{
const struct ssh_digest *digest;
if (ctx != NULL) {
digest = ssh_digest_by_alg(ctx->alg);
if (digest) {
explicit_bzero(ctx->mdctx, digest->ctx_len);
free(ctx->mdctx);
freezero(ctx, sizeof(*ctx));
}
}
}
int
ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
{
struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
if (ctx == NULL)
return SSH_ERR_INVALID_ARGUMENT;
if (ssh_digest_update(ctx, m, mlen) != 0 ||
ssh_digest_final(ctx, d, dlen) != 0)
return SSH_ERR_INVALID_ARGUMENT;
ssh_digest_free(ctx);
return 0;
}
int
ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
{
return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
}
#endif /* !WITH_OPENSSL */