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Annotation of src/usr.bin/ssh/rsa.c, Revision 1.2

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"
1.2     ! deraadt    38: RCSID("$Id: rsa.c,v 1.1 1999/09/28 04:45:37 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:   extern char *__progname;
        !            51:
        !            52:   key = RSA_generate_key(32, 3, NULL, NULL);
        !            53:   if (key == NULL)
        !            54:     return (0);
        !            55:   RSA_free(key);
        !            56:   return (1);
        !            57: }
1.1       provos     58:
                     59: /* Generates RSA public and private keys.  This initializes the data
                     60:    structures; they should be freed with rsa_clear_private_key and
                     61:    rsa_clear_public_key. */
                     62:
                     63: void
                     64: rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
                     65: {
                     66:   RSA *key;
                     67:
                     68:   if (rsa_verbose) {
                     69:     printf("Generating RSA keys:  ");
                     70:     fflush(stdout);
                     71:   }
                     72:
                     73:   key = RSA_generate_key(bits, 35, NULL, NULL);
                     74:
                     75:   assert(key != NULL);
                     76:
                     77:   /* Copy public key parameters */
                     78:   pub->n = BN_new();
                     79:   BN_copy(pub->n, key->n);
                     80:   pub->e = BN_new();
                     81:   BN_copy(pub->e, key->e);
                     82:
                     83:   /* Copy private key parameters */
                     84:   prv->n = BN_new();
                     85:   BN_copy(prv->n, key->n);
                     86:   prv->e = BN_new();
                     87:   BN_copy(prv->e, key->e);
                     88:   prv->d = BN_new();
                     89:   BN_copy(prv->d, key->d);
                     90:   prv->p = BN_new();
                     91:   BN_copy(prv->p, key->p);
                     92:   prv->q = BN_new();
                     93:   BN_copy(prv->q, key->q);
                     94:
                     95:   prv->dmp1 = BN_new();
                     96:   BN_copy(prv->dmp1, key->dmp1);
                     97:
                     98:   prv->dmq1 = BN_new();
                     99:   BN_copy(prv->dmq1, key->dmq1);
                    100:
                    101:   prv->iqmp = BN_new();
                    102:   BN_copy(prv->iqmp, key->iqmp);
                    103:
                    104:   RSA_free(key);
                    105:
                    106:   if (rsa_verbose)
                    107:     printf("Key generation complete.\n");
                    108: }
                    109:
                    110: void
                    111: rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA* key)
                    112: {
                    113:   char *inbuf, *outbuf;
                    114:   int len;
                    115:
                    116:   len = BN_num_bytes(key->n);
                    117:   outbuf = xmalloc(len);
                    118:
                    119:   len = BN_num_bytes(in);
                    120:   inbuf = xmalloc(len);
                    121:   BN_bn2bin(in, inbuf);
                    122:
                    123:   if ((len = RSA_public_encrypt(len, inbuf, outbuf, key,
                    124:                                RSA_PKCS1_PADDING)) <= 0)
                    125:     fatal("rsa_public_encrypt() failed");
                    126:
                    127:   BN_bin2bn(outbuf, len, out);
                    128:
                    129:   xfree(outbuf);
                    130:   xfree(inbuf);
                    131: }
                    132:
                    133: void
                    134: rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
                    135: {
                    136:   char *inbuf, *outbuf;
                    137:   int len;
                    138:
                    139:   len = BN_num_bytes(key->n);
                    140:   outbuf = xmalloc(len);
                    141:
                    142:   len = BN_num_bytes(in);
                    143:   inbuf = xmalloc(len);
                    144:   BN_bn2bin(in, inbuf);
                    145:
                    146:   if ((len = RSA_private_decrypt(len, inbuf, outbuf, key,
                    147:                                 RSA_SSLV23_PADDING)) <= 0)
                    148:     fatal("rsa_private_decrypt() failed");
                    149:
                    150:   BN_bin2bn(outbuf, len, out);
                    151:
                    152:   xfree(outbuf);
                    153:   xfree(inbuf);
                    154: }
                    155:
                    156: /* Set whether to output verbose messages during key generation. */
                    157:
                    158: void
                    159: rsa_set_verbose(int verbose)
                    160: {
                    161:   rsa_verbose = verbose;
                    162: }