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Diffstat (limited to 'crypto/openssh/rsa.c')
| -rw-r--r-- | crypto/openssh/rsa.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/crypto/openssh/rsa.c b/crypto/openssh/rsa.c new file mode 100644 index 0000000..3dabac1 --- /dev/null +++ b/crypto/openssh/rsa.c @@ -0,0 +1,196 @@ +/* + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * + * 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) 1999 Niels Provos. 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. + * + * + * Description of the RSA algorithm can be found e.g. from the following + * sources: + * + * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994. + * + * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to + * Computer Security. Prentice-Hall, 1989. + * + * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill, + * 1994. + * + * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications + * System and Method. US Patent 4,405,829, 1983. + * + * Hans Riesel: Prime Numbers and Computer Methods for Factorization. + * Birkhauser, 1994. + * + * The RSA Frequently Asked Questions document by RSA Data Security, + * Inc., 1995. + * + * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as + * included below: + * + * [gone - had to be deleted - what a pity] + */ + +#include "includes.h" +RCSID("$OpenBSD: rsa.c,v 1.16 2000/09/07 20:27:53 deraadt Exp $"); +RCSID("$FreeBSD$"); + +#include "rsa.h" +#include "ssh.h" +#include "xmalloc.h" + +int rsa_verbose = 1; + +int +rsa_alive() +{ + RSA *key; + + key = RSA_generate_key(32, 3, NULL, NULL); + if (key == NULL) + return (0); + RSA_free(key); + return (1); +} + +/* + * Generates RSA public and private keys. This initializes the data + * structures; they should be freed with rsa_clear_private_key and + * rsa_clear_public_key. + */ + +void +rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits) +{ + RSA *key; + + if (rsa_verbose) { + printf("Generating RSA keys: "); + fflush(stdout); + } + key = RSA_generate_key(bits, 35, NULL, NULL); + if (key == NULL) + fatal("rsa_generate_key: key generation failed."); + + /* Copy public key parameters */ + pub->n = BN_new(); + BN_copy(pub->n, key->n); + pub->e = BN_new(); + BN_copy(pub->e, key->e); + + /* Copy private key parameters */ + prv->n = BN_new(); + BN_copy(prv->n, key->n); + prv->e = BN_new(); + BN_copy(prv->e, key->e); + prv->d = BN_new(); + BN_copy(prv->d, key->d); + prv->p = BN_new(); + BN_copy(prv->p, key->p); + prv->q = BN_new(); + BN_copy(prv->q, key->q); + + prv->dmp1 = BN_new(); + BN_copy(prv->dmp1, key->dmp1); + + prv->dmq1 = BN_new(); + BN_copy(prv->dmq1, key->dmq1); + + prv->iqmp = BN_new(); + BN_copy(prv->iqmp, key->iqmp); + + RSA_free(key); + + if (rsa_verbose) + printf("Key generation complete.\n"); +} + +void +rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key) +{ + unsigned char *inbuf, *outbuf; + int len, ilen, olen; + + if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e)) + fatal("rsa_public_encrypt() exponent too small or not odd"); + + olen = BN_num_bytes(key->n); + outbuf = xmalloc(olen); + + ilen = BN_num_bytes(in); + inbuf = xmalloc(ilen); + BN_bn2bin(in, inbuf); + + if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key, + RSA_PKCS1_PADDING)) <= 0) + fatal("rsa_public_encrypt() failed."); + + BN_bin2bn(outbuf, len, out); + + memset(outbuf, 0, olen); + memset(inbuf, 0, ilen); + xfree(outbuf); + xfree(inbuf); +} + +int +rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key) +{ + unsigned char *inbuf, *outbuf; + int len, ilen, olen; + + olen = BN_num_bytes(key->n); + outbuf = xmalloc(olen); + + ilen = BN_num_bytes(in); + inbuf = xmalloc(ilen); + BN_bn2bin(in, inbuf); + + if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key, + RSA_PKCS1_PADDING)) <= 0) { + error("rsa_private_decrypt() failed"); + } else { + BN_bin2bn(outbuf, len, out); + } + memset(outbuf, 0, olen); + memset(inbuf, 0, ilen); + xfree(outbuf); + xfree(inbuf); + return len; +} + +/* Set whether to output verbose messages during key generation. */ + +void +rsa_set_verbose(int verbose) +{ + rsa_verbose = verbose; +} |
