Annotation of src/usr.bin/ssh/rsa.c, Revision 1.16
1.1 provos 1: /*
1.10 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.14 markus 5: *
1.16 ! deraadt 6: * As far as I am concerned, the code I have written for this software
! 7: * can be used freely for any purpose. Any derived versions of this
! 8: * software must be clearly marked as such, and if the derived work is
! 9: * incompatible with the protocol description in the RFC file, it must be
! 10: * called by a name other than "ssh" or "Secure Shell".
! 11: *
! 12: *
! 13: * Copyright (c) 1999 Niels Provos. All rights reserved.
! 14: *
! 15: * Redistribution and use in source and binary forms, with or without
! 16: * modification, are permitted provided that the following conditions
! 17: * are met:
! 18: * 1. Redistributions of source code must retain the above copyright
! 19: * notice, this list of conditions and the following disclaimer.
! 20: * 2. Redistributions in binary form must reproduce the above copyright
! 21: * notice, this list of conditions and the following disclaimer in the
! 22: * documentation and/or other materials provided with the distribution.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.14 markus 34: *
1.16 ! deraadt 35: *
! 36: * Description of the RSA algorithm can be found e.g. from the following
! 37: * sources:
1.14 markus 38: *
1.10 deraadt 39: * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
1.14 markus 40: *
1.10 deraadt 41: * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
42: * Computer Security. Prentice-Hall, 1989.
1.14 markus 43: *
1.10 deraadt 44: * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
45: * 1994.
1.14 markus 46: *
1.10 deraadt 47: * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
48: * System and Method. US Patent 4,405,829, 1983.
1.14 markus 49: *
1.10 deraadt 50: * Hans Riesel: Prime Numbers and Computer Methods for Factorization.
51: * Birkhauser, 1994.
1.14 markus 52: *
1.16 ! deraadt 53: * The RSA Frequently Asked Questions document by RSA Data Security,
! 54: * Inc., 1995.
1.14 markus 55: *
1.16 ! deraadt 56: * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as
! 57: * included below:
1.14 markus 58: *
1.10 deraadt 59: * [gone - had to be deleted - what a pity]
1.16 ! deraadt 60: */
1.1 provos 61:
62: #include "includes.h"
1.16 ! deraadt 63: RCSID("$OpenBSD: rsa.c,v 1.15 2000/06/20 01:39:44 markus Exp $");
1.1 provos 64:
65: #include "rsa.h"
66: #include "ssh.h"
67: #include "xmalloc.h"
68:
69: int rsa_verbose = 1;
1.2 deraadt 70:
71: int
72: rsa_alive()
73: {
1.9 markus 74: RSA *key;
1.2 deraadt 75:
1.9 markus 76: key = RSA_generate_key(32, 3, NULL, NULL);
77: if (key == NULL)
78: return (0);
79: RSA_free(key);
80: return (1);
1.2 deraadt 81: }
1.1 provos 82:
1.11 markus 83: /*
84: * Generates RSA public and private keys. This initializes the data
85: * structures; they should be freed with rsa_clear_private_key and
86: * rsa_clear_public_key.
87: */
1.1 provos 88:
89: void
90: rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
91: {
1.9 markus 92: RSA *key;
1.1 provos 93:
1.9 markus 94: if (rsa_verbose) {
95: printf("Generating RSA keys: ");
96: fflush(stdout);
97: }
98: key = RSA_generate_key(bits, 35, NULL, NULL);
99: if (key == NULL)
100: fatal("rsa_generate_key: key generation failed.");
101:
102: /* Copy public key parameters */
103: pub->n = BN_new();
104: BN_copy(pub->n, key->n);
105: pub->e = BN_new();
106: BN_copy(pub->e, key->e);
107:
108: /* Copy private key parameters */
109: prv->n = BN_new();
110: BN_copy(prv->n, key->n);
111: prv->e = BN_new();
112: BN_copy(prv->e, key->e);
113: prv->d = BN_new();
114: BN_copy(prv->d, key->d);
115: prv->p = BN_new();
116: BN_copy(prv->p, key->p);
117: prv->q = BN_new();
118: BN_copy(prv->q, key->q);
119:
120: prv->dmp1 = BN_new();
121: BN_copy(prv->dmp1, key->dmp1);
122:
123: prv->dmq1 = BN_new();
124: BN_copy(prv->dmq1, key->dmq1);
125:
126: prv->iqmp = BN_new();
127: BN_copy(prv->iqmp, key->iqmp);
128:
129: RSA_free(key);
130:
131: if (rsa_verbose)
132: printf("Key generation complete.\n");
1.1 provos 133: }
134:
135: void
1.9 markus 136: rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
1.1 provos 137: {
1.13 markus 138: unsigned char *inbuf, *outbuf;
1.9 markus 139: int len, ilen, olen;
1.4 provos 140:
1.9 markus 141: if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
142: fatal("rsa_public_encrypt() exponent too small or not odd");
1.1 provos 143:
1.9 markus 144: olen = BN_num_bytes(key->n);
145: outbuf = xmalloc(olen);
1.1 provos 146:
1.9 markus 147: ilen = BN_num_bytes(in);
148: inbuf = xmalloc(ilen);
149: BN_bn2bin(in, inbuf);
1.1 provos 150:
1.9 markus 151: if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
1.12 markus 152: RSA_PKCS1_PADDING)) <= 0)
1.9 markus 153: fatal("rsa_public_encrypt() failed");
1.1 provos 154:
1.9 markus 155: BN_bin2bn(outbuf, len, out);
1.1 provos 156:
1.9 markus 157: memset(outbuf, 0, olen);
158: memset(inbuf, 0, ilen);
159: xfree(outbuf);
160: xfree(inbuf);
1.1 provos 161: }
162:
163: void
164: rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
165: {
1.13 markus 166: unsigned char *inbuf, *outbuf;
1.9 markus 167: int len, ilen, olen;
1.1 provos 168:
1.9 markus 169: olen = BN_num_bytes(key->n);
170: outbuf = xmalloc(olen);
1.1 provos 171:
1.9 markus 172: ilen = BN_num_bytes(in);
173: inbuf = xmalloc(ilen);
174: BN_bn2bin(in, inbuf);
175:
176: if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
1.12 markus 177: RSA_PKCS1_PADDING)) <= 0)
1.9 markus 178: fatal("rsa_private_decrypt() failed");
179:
180: BN_bin2bn(outbuf, len, out);
181:
182: memset(outbuf, 0, olen);
183: memset(inbuf, 0, ilen);
184: xfree(outbuf);
185: xfree(inbuf);
1.1 provos 186: }
187:
188: /* Set whether to output verbose messages during key generation. */
189:
190: void
191: rsa_set_verbose(int verbose)
192: {
1.9 markus 193: rsa_verbose = verbose;
1.1 provos 194: }
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