--- /dev/null
+/* $OpenBSD: digest-libc.c,v 1.1 2014/01/28 20:13:46 markus 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"
+
+#include <sys/types.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <md5.h>
+#include <rmd160.h>
+#include <sha1.h>
+#include <sha2.h>
+
+#include "buffer.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(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]);
+}
+
+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 -1;
+ 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 -1;
+ digest->md_update(ctx->mdctx, m, mlen);
+ return 0;
+}
+
+int
+ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
+{
+ return ssh_digest_update(ctx, buffer_ptr(b), buffer_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 -1;
+ if (dlen > UINT_MAX)
+ return -1;
+ if (dlen < digest->digest_len) /* No truncation allowed */
+ return -1;
+ 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) {
+ memset(ctx->mdctx, 0, digest->ctx_len);
+ free(ctx->mdctx);
+ memset(ctx, 0, 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 -1;
+ if (ssh_digest_update(ctx, m, mlen) != 0 ||
+ ssh_digest_final(ctx, d, dlen) != 0)
+ return -1;
+ ssh_digest_free(ctx);
+ return 0;
+}
+
+int
+ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
+{
+ return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);
+}
projects / thirdparty / openssh-portable.git / commitdiff
