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Annotation of src/usr.bin/ssh/rsa.c, Revision 1.5

1.1       provos      1: /*
                      2:
                      3: rsa.c
                      4:
                      5: Author: Tatu Ylonen <ylo@cs.hut.fi>
                      6:
                      7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                      8:                    All rights reserved
                      9:
                     10: Created: Fri Mar  3 22:07:06 1995 ylo
                     11:
                     12: Description of the RSA algorithm can be found e.g. from the following sources:
                     13:
                     14:   Bruce Schneier: Applied Cryptography.  John Wiley & Sons, 1994.
                     15:
                     16:   Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
                     17:     Computer Security.  Prentice-Hall, 1989.
                     18:
                     19:   Man Young Rhee: Cryptography and Secure Data Communications.  McGraw-Hill,
                     20:     1994.
                     21:
                     22:   R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
                     23:     System and Method.  US Patent 4,405,829, 1983.
                     24:
                     25:   Hans Riesel: Prime Numbers and Computer Methods for Factorization.
                     26:     Birkhauser, 1994.
                     27:
                     28:   The RSA Frequently Asked Questions document by RSA Data Security, Inc., 1995.
                     29:
                     30:   RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as included
                     31:     below:
                     32:
                     33:     gone - had to be deleted - what a pity
                     34:
                     35: */
                     36:
                     37: #include "includes.h"
1.5     ! provos     38: RCSID("$Id: rsa.c,v 1.4 1999/10/16 23:20:25 provos Exp $");
1.1       provos     39:
                     40: #include "rsa.h"
                     41: #include "ssh.h"
                     42: #include "xmalloc.h"
                     43:
                     44: int rsa_verbose = 1;
1.2       deraadt    45:
                     46: int
                     47: rsa_alive()
                     48: {
                     49:   RSA *key;
                     50:
                     51:   key = RSA_generate_key(32, 3, NULL, NULL);
                     52:   if (key == NULL)
                     53:     return (0);
                     54:   RSA_free(key);
                     55:   return (1);
                     56: }
1.1       provos     57:
                     58: /* Generates RSA public and private keys.  This initializes the data
                     59:    structures; they should be freed with rsa_clear_private_key and
                     60:    rsa_clear_public_key. */
                     61:
                     62: void
                     63: rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
                     64: {
                     65:   RSA *key;
                     66:
                     67:   if (rsa_verbose) {
                     68:     printf("Generating RSA keys:  ");
                     69:     fflush(stdout);
                     70:   }
                     71:
                     72:   key = RSA_generate_key(bits, 35, NULL, NULL);
                     73:
                     74:   assert(key != NULL);
                     75:
                     76:   /* Copy public key parameters */
                     77:   pub->n = BN_new();
                     78:   BN_copy(pub->n, key->n);
                     79:   pub->e = BN_new();
                     80:   BN_copy(pub->e, key->e);
                     81:
                     82:   /* Copy private key parameters */
                     83:   prv->n = BN_new();
                     84:   BN_copy(prv->n, key->n);
                     85:   prv->e = BN_new();
                     86:   BN_copy(prv->e, key->e);
                     87:   prv->d = BN_new();
                     88:   BN_copy(prv->d, key->d);
                     89:   prv->p = BN_new();
                     90:   BN_copy(prv->p, key->p);
                     91:   prv->q = BN_new();
                     92:   BN_copy(prv->q, key->q);
                     93:
                     94:   prv->dmp1 = BN_new();
                     95:   BN_copy(prv->dmp1, key->dmp1);
                     96:
                     97:   prv->dmq1 = BN_new();
                     98:   BN_copy(prv->dmq1, key->dmq1);
                     99:
                    100:   prv->iqmp = BN_new();
                    101:   BN_copy(prv->iqmp, key->iqmp);
                    102:
                    103:   RSA_free(key);
                    104:
                    105:   if (rsa_verbose)
                    106:     printf("Key generation complete.\n");
                    107: }
                    108:
                    109: void
                    110: rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA* key)
                    111: {
                    112:   char *inbuf, *outbuf;
                    113:   int len;
1.4       provos    114:
1.5     ! provos    115:   if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
        !           116:     fatal("rsa_public_encrypt() exponent too small or not odd");
1.1       provos    117:
                    118:   len = BN_num_bytes(key->n);
                    119:   outbuf = xmalloc(len);
                    120:
                    121:   len = BN_num_bytes(in);
                    122:   inbuf = xmalloc(len);
                    123:   BN_bn2bin(in, inbuf);
                    124:
                    125:   if ((len = RSA_public_encrypt(len, inbuf, outbuf, key,
                    126:                                RSA_PKCS1_PADDING)) <= 0)
                    127:     fatal("rsa_public_encrypt() failed");
                    128:
                    129:   BN_bin2bn(outbuf, len, out);
                    130:
                    131:   xfree(outbuf);
                    132:   xfree(inbuf);
                    133: }
                    134:
                    135: void
                    136: rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
                    137: {
                    138:   char *inbuf, *outbuf;
                    139:   int len;
                    140:
                    141:   len = BN_num_bytes(key->n);
                    142:   outbuf = xmalloc(len);
                    143:
                    144:   len = BN_num_bytes(in);
                    145:   inbuf = xmalloc(len);
                    146:   BN_bn2bin(in, inbuf);
                    147:
                    148:   if ((len = RSA_private_decrypt(len, inbuf, outbuf, key,
                    149:                                 RSA_SSLV23_PADDING)) <= 0)
                    150:     fatal("rsa_private_decrypt() failed");
                    151:
                    152:   BN_bin2bn(outbuf, len, out);
                    153:
                    154:   xfree(outbuf);
                    155:   xfree(inbuf);
                    156: }
                    157:
                    158: /* Set whether to output verbose messages during key generation. */
                    159:
                    160: void
                    161: rsa_set_verbose(int verbose)
                    162: {
                    163:   rsa_verbose = verbose;
                    164: }