Annotation of src/usr.bin/ssh/rsa.c, Revision 1.10
1.1 provos 1: /*
1.10 ! deraadt 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: *
1.1 provos 35: */
36:
37: #include "includes.h"
1.10 ! deraadt 38: RCSID("$Id: rsa.c,v 1.9 1999/11/23 22:25:54 markus 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: {
1.9 markus 49: RSA *key;
1.2 deraadt 50:
1.9 markus 51: key = RSA_generate_key(32, 3, NULL, NULL);
52: if (key == NULL)
53: return (0);
54: RSA_free(key);
55: return (1);
1.2 deraadt 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: {
1.9 markus 65: RSA *key;
1.1 provos 66:
1.9 markus 67: if (rsa_verbose) {
68: printf("Generating RSA keys: ");
69: fflush(stdout);
70: }
71: key = RSA_generate_key(bits, 35, NULL, NULL);
72: if (key == NULL)
73: fatal("rsa_generate_key: key generation failed.");
74:
75: /* Copy public key parameters */
76: pub->n = BN_new();
77: BN_copy(pub->n, key->n);
78: pub->e = BN_new();
79: BN_copy(pub->e, key->e);
80:
81: /* Copy private key parameters */
82: prv->n = BN_new();
83: BN_copy(prv->n, key->n);
84: prv->e = BN_new();
85: BN_copy(prv->e, key->e);
86: prv->d = BN_new();
87: BN_copy(prv->d, key->d);
88: prv->p = BN_new();
89: BN_copy(prv->p, key->p);
90: prv->q = BN_new();
91: BN_copy(prv->q, key->q);
92:
93: prv->dmp1 = BN_new();
94: BN_copy(prv->dmp1, key->dmp1);
95:
96: prv->dmq1 = BN_new();
97: BN_copy(prv->dmq1, key->dmq1);
98:
99: prv->iqmp = BN_new();
100: BN_copy(prv->iqmp, key->iqmp);
101:
102: RSA_free(key);
103:
104: if (rsa_verbose)
105: printf("Key generation complete.\n");
1.1 provos 106: }
107:
108: void
1.9 markus 109: rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
1.1 provos 110: {
1.9 markus 111: char *inbuf, *outbuf;
112: int len, ilen, olen;
1.4 provos 113:
1.9 markus 114: if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
115: fatal("rsa_public_encrypt() exponent too small or not odd");
1.1 provos 116:
1.9 markus 117: olen = BN_num_bytes(key->n);
118: outbuf = xmalloc(olen);
1.1 provos 119:
1.9 markus 120: ilen = BN_num_bytes(in);
121: inbuf = xmalloc(ilen);
122: BN_bn2bin(in, inbuf);
1.1 provos 123:
1.9 markus 124: if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
125: RSA_PKCS1_PADDING)) <= 0)
126: fatal("rsa_public_encrypt() failed");
1.1 provos 127:
1.9 markus 128: BN_bin2bn(outbuf, len, out);
1.1 provos 129:
1.9 markus 130: memset(outbuf, 0, olen);
131: memset(inbuf, 0, ilen);
132: xfree(outbuf);
133: xfree(inbuf);
1.1 provos 134: }
135:
136: void
137: rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
138: {
1.9 markus 139: char *inbuf, *outbuf;
140: int len, ilen, olen;
1.1 provos 141:
1.9 markus 142: olen = BN_num_bytes(key->n);
143: outbuf = xmalloc(olen);
1.1 provos 144:
1.9 markus 145: ilen = BN_num_bytes(in);
146: inbuf = xmalloc(ilen);
147: BN_bn2bin(in, inbuf);
148:
149: if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
150: RSA_SSLV23_PADDING)) <= 0)
151: fatal("rsa_private_decrypt() failed");
152:
153: BN_bin2bn(outbuf, len, out);
154:
155: memset(outbuf, 0, olen);
156: memset(inbuf, 0, ilen);
157: xfree(outbuf);
158: xfree(inbuf);
1.1 provos 159: }
160:
161: /* Set whether to output verbose messages during key generation. */
162:
163: void
164: rsa_set_verbose(int verbose)
165: {
1.9 markus 166: rsa_verbose = verbose;
1.1 provos 167: }
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