summaryrefslogtreecommitdiffstats
path: root/crypto/openssh/key.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/openssh/key.c')
-rw-r--r--crypto/openssh/key.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/crypto/openssh/key.c b/crypto/openssh/key.c
new file mode 100644
index 0000000..f83724a
--- /dev/null
+++ b/crypto/openssh/key.c
@@ -0,0 +1,351 @@
+/*
+ * read_bignum():
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+#include "ssh.h"
+#include <openssl/rsa.h>
+#include <openssl/dsa.h>
+#include <openssl/evp.h>
+#include "xmalloc.h"
+#include "key.h"
+#include "dsa.h"
+#include "uuencode.h"
+
+RCSID("$OpenBSD: key.c,v 1.11 2000/09/07 20:27:51 deraadt Exp $");
+RCSID("$FreeBSD$");
+
+#define SSH_DSS "ssh-dss"
+
+Key *
+key_new(int type)
+{
+ Key *k;
+ RSA *rsa;
+ DSA *dsa;
+ k = xmalloc(sizeof(*k));
+ k->type = type;
+ k->dsa = NULL;
+ k->rsa = NULL;
+ switch (k->type) {
+ case KEY_RSA:
+ rsa = RSA_new();
+ rsa->n = BN_new();
+ rsa->e = BN_new();
+ k->rsa = rsa;
+ break;
+ case KEY_DSA:
+ dsa = DSA_new();
+ dsa->p = BN_new();
+ dsa->q = BN_new();
+ dsa->g = BN_new();
+ dsa->pub_key = BN_new();
+ k->dsa = dsa;
+ break;
+ case KEY_EMPTY:
+ break;
+ default:
+ fatal("key_new: bad key type %d", k->type);
+ break;
+ }
+ return k;
+}
+void
+key_free(Key *k)
+{
+ switch (k->type) {
+ case KEY_RSA:
+ if (k->rsa != NULL)
+ RSA_free(k->rsa);
+ k->rsa = NULL;
+ break;
+ case KEY_DSA:
+ if (k->dsa != NULL)
+ DSA_free(k->dsa);
+ k->dsa = NULL;
+ break;
+ default:
+ fatal("key_free: bad key type %d", k->type);
+ break;
+ }
+ xfree(k);
+}
+int
+key_equal(Key *a, Key *b)
+{
+ if (a == NULL || b == NULL || a->type != b->type)
+ return 0;
+ switch (a->type) {
+ case KEY_RSA:
+ return a->rsa != NULL && b->rsa != NULL &&
+ BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
+ BN_cmp(a->rsa->n, b->rsa->n) == 0;
+ break;
+ case KEY_DSA:
+ return a->dsa != NULL && b->dsa != NULL &&
+ BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
+ BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
+ BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
+ BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
+ break;
+ default:
+ fatal("key_equal: bad key type %d", a->type);
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Generate key fingerprint in ascii format.
+ * Based on ideas and code from Bjoern Groenvall <bg@sics.se>
+ */
+char *
+key_fingerprint(Key *k)
+{
+ static char retval[(EVP_MAX_MD_SIZE+1)*3];
+ unsigned char *blob = NULL;
+ int len = 0;
+ int nlen, elen;
+
+ switch (k->type) {
+ case KEY_RSA:
+ nlen = BN_num_bytes(k->rsa->n);
+ elen = BN_num_bytes(k->rsa->e);
+ len = nlen + elen;
+ blob = xmalloc(len);
+ BN_bn2bin(k->rsa->n, blob);
+ BN_bn2bin(k->rsa->e, blob + nlen);
+ break;
+ case KEY_DSA:
+ dsa_make_key_blob(k, &blob, &len);
+ break;
+ default:
+ fatal("key_fingerprint: bad key type %d", k->type);
+ break;
+ }
+ retval[0] = '\0';
+
+ if (blob != NULL) {
+ int i;
+ unsigned char digest[EVP_MAX_MD_SIZE];
+ EVP_MD *md = EVP_md5();
+ EVP_MD_CTX ctx;
+ EVP_DigestInit(&ctx, md);
+ EVP_DigestUpdate(&ctx, blob, len);
+ EVP_DigestFinal(&ctx, digest, NULL);
+ for(i = 0; i < md->md_size; i++) {
+ char hex[4];
+ snprintf(hex, sizeof(hex), "%02x:", digest[i]);
+ strlcat(retval, hex, sizeof(retval));
+ }
+ retval[strlen(retval) - 1] = '\0';
+ memset(blob, 0, len);
+ xfree(blob);
+ }
+ return retval;
+}
+
+/*
+ * Reads a multiple-precision integer in decimal from the buffer, and advances
+ * the pointer. The integer must already be initialized. This function is
+ * permitted to modify the buffer. This leaves *cpp to point just beyond the
+ * last processed (and maybe modified) character. Note that this may modify
+ * the buffer containing the number.
+ */
+int
+read_bignum(char **cpp, BIGNUM * value)
+{
+ char *cp = *cpp;
+ int old;
+
+ /* Skip any leading whitespace. */
+ for (; *cp == ' ' || *cp == '\t'; cp++)
+ ;
+
+ /* Check that it begins with a decimal digit. */
+ if (*cp < '0' || *cp > '9')
+ return 0;
+
+ /* Save starting position. */
+ *cpp = cp;
+
+ /* Move forward until all decimal digits skipped. */
+ for (; *cp >= '0' && *cp <= '9'; cp++)
+ ;
+
+ /* Save the old terminating character, and replace it by \0. */
+ old = *cp;
+ *cp = 0;
+
+ /* Parse the number. */
+ if (BN_dec2bn(&value, *cpp) == 0)
+ return 0;
+
+ /* Restore old terminating character. */
+ *cp = old;
+
+ /* Move beyond the number and return success. */
+ *cpp = cp;
+ return 1;
+}
+int
+write_bignum(FILE *f, BIGNUM *num)
+{
+ char *buf = BN_bn2dec(num);
+ if (buf == NULL) {
+ error("write_bignum: BN_bn2dec() failed");
+ return 0;
+ }
+ fprintf(f, " %s", buf);
+ free(buf);
+ return 1;
+}
+unsigned int
+key_read(Key *ret, char **cpp)
+{
+ Key *k;
+ unsigned int bits = 0;
+ char *cp;
+ int len, n;
+ unsigned char *blob;
+
+ cp = *cpp;
+
+ switch(ret->type) {
+ case KEY_RSA:
+ /* Get number of bits. */
+ if (*cp < '0' || *cp > '9')
+ return 0; /* Bad bit count... */
+ for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
+ bits = 10 * bits + *cp - '0';
+ if (bits == 0)
+ return 0;
+ *cpp = cp;
+ /* Get public exponent, public modulus. */
+ if (!read_bignum(cpp, ret->rsa->e))
+ return 0;
+ if (!read_bignum(cpp, ret->rsa->n))
+ return 0;
+ break;
+ case KEY_DSA:
+ if (strncmp(cp, SSH_DSS " ", 7) != 0)
+ return 0;
+ cp += 7;
+ len = 2*strlen(cp);
+ blob = xmalloc(len);
+ n = uudecode(cp, blob, len);
+ if (n < 0) {
+ error("key_read: uudecode %s failed", cp);
+ return 0;
+ }
+ k = dsa_key_from_blob(blob, n);
+ if (k == NULL) {
+ error("key_read: dsa_key_from_blob %s failed", cp);
+ return 0;
+ }
+ xfree(blob);
+ if (ret->dsa != NULL)
+ DSA_free(ret->dsa);
+ ret->dsa = k->dsa;
+ k->dsa = NULL;
+ key_free(k);
+ bits = BN_num_bits(ret->dsa->p);
+ /* advance cp: skip whitespace and data */
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ while (*cp != '\0' && *cp != ' ' && *cp != '\t')
+ cp++;
+ *cpp = cp;
+ break;
+ default:
+ fatal("key_read: bad key type: %d", ret->type);
+ break;
+ }
+ return bits;
+}
+int
+key_write(Key *key, FILE *f)
+{
+ int success = 0;
+ unsigned int bits = 0;
+
+ if (key->type == KEY_RSA && key->rsa != NULL) {
+ /* size of modulus 'n' */
+ bits = BN_num_bits(key->rsa->n);
+ fprintf(f, "%u", bits);
+ if (write_bignum(f, key->rsa->e) &&
+ write_bignum(f, key->rsa->n)) {
+ success = 1;
+ } else {
+ error("key_write: failed for RSA key");
+ }
+ } else if (key->type == KEY_DSA && key->dsa != NULL) {
+ int len, n;
+ unsigned char *blob, *uu;
+ dsa_make_key_blob(key, &blob, &len);
+ uu = xmalloc(2*len);
+ n = uuencode(blob, len, uu, 2*len);
+ if (n > 0) {
+ fprintf(f, "%s %s", SSH_DSS, uu);
+ success = 1;
+ }
+ xfree(blob);
+ xfree(uu);
+ }
+ return success;
+}
+char *
+key_type(Key *k)
+{
+ switch (k->type) {
+ case KEY_RSA:
+ return "RSA";
+ break;
+ case KEY_DSA:
+ return "DSA";
+ break;
+ }
+ return "unknown";
+}
+unsigned int
+key_size(Key *k){
+ switch (k->type) {
+ case KEY_RSA:
+ return BN_num_bits(k->rsa->n);
+ break;
+ case KEY_DSA:
+ return BN_num_bits(k->dsa->p);
+ break;
+ }
+ return 0;
+}
OpenPOWER on IntegriCloud