1 files changed, 238 insertions, 0 deletions

diff --git a/digest-libc.c b/digest-libc.c
new file mode 100644
index 000000000..e1fcda71a
--- /dev/null
+++ b/digest-libc.c
@@ -0,0 +1,238 @@
+/* $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);
+}