265 lines
5.9 KiB
C
265 lines
5.9 KiB
C
/* $OpenBSD: digest-libc.c,v 1.4 2014/12/21 22:27:56 djm 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>
|
|
#include <sha1.h>
|
|
#include <sha2.h>
|
|
#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_RIPEMD160,
|
|
"RIPEMD160",
|
|
RMD160_BLOCK_LENGTH,
|
|
RMD160_DIGEST_LENGTH,
|
|
sizeof(RMD160_CTX),
|
|
(md_init_fn *) RMD160Init,
|
|
(md_update_fn *) RMD160Update,
|
|
(md_final_fn *) RMD160Final
|
|
},
|
|
{
|
|
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(SHA256_CTX),
|
|
(md_init_fn *) SHA256_Init,
|
|
(md_update_fn *) SHA256_Update,
|
|
(md_final_fn *) SHA256_Final
|
|
},
|
|
{
|
|
SSH_DIGEST_SHA384,
|
|
"SHA384",
|
|
SHA384_BLOCK_LENGTH,
|
|
SHA384_DIGEST_LENGTH,
|
|
sizeof(SHA384_CTX),
|
|
(md_init_fn *) SHA384_Init,
|
|
(md_update_fn *) SHA384_Update,
|
|
(md_final_fn *) SHA384_Final
|
|
},
|
|
{
|
|
SSH_DIGEST_SHA512,
|
|
"SHA512",
|
|
SHA512_BLOCK_LENGTH,
|
|
SHA512_DIGEST_LENGTH,
|
|
sizeof(SHA512_CTX),
|
|
(md_init_fn *) SHA512_Init,
|
|
(md_update_fn *) SHA512_Update,
|
|
(md_final_fn *) SHA512_Final
|
|
}
|
|
};
|
|
|
|
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);
|
|
explicit_bzero(ctx, sizeof(*ctx));
|
|
free(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 */
|