diff options
Diffstat (limited to 'digest-libc.c')
| -rw-r--r-- | digest-libc.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/digest-libc.c b/digest-libc.c new file mode 100644 index 0000000..6e77a44 --- /dev/null +++ b/digest-libc.c @@ -0,0 +1,267 @@ +/* $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 */ |