5 Author: Tatu Ylonen <ylo@cs.hut.fi>
7 Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
10 Created: Fri Mar 3 22:07:06 1995 ylo
12 Description of the RSA algorithm can be found e.g. from the following sources:
14 Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
16 Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
17 Computer Security. Prentice-Hall, 1989.
19 Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
22 R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
23 System and Method. US Patent 4,405,829, 1983.
25 Hans Riesel: Prime Numbers and Computer Methods for Factorization.
28 The RSA Frequently Asked Questions document by RSA Data Security, Inc., 1995.
30 RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as included
33 gone - had to be deleted - what a pity
51 key = RSA_generate_key(32, 3, NULL, NULL);
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. */
63 rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
68 printf("Generating RSA keys: ");
72 key = RSA_generate_key(bits, 35, NULL, NULL);
74 fatal("rsa_generate_key: key generation failed.");
76 /* Copy public key parameters */
78 BN_copy(pub->n, key->n);
80 BN_copy(pub->e, key->e);
82 /* Copy private key parameters */
84 BN_copy(prv->n, key->n);
86 BN_copy(prv->e, key->e);
88 BN_copy(prv->d, key->d);
90 BN_copy(prv->p, key->p);
92 BN_copy(prv->q, key->q);
95 BN_copy(prv->dmp1, key->dmp1);
98 BN_copy(prv->dmq1, key->dmq1);
100 prv->iqmp = BN_new();
101 BN_copy(prv->iqmp, key->iqmp);
106 printf("Key generation complete.\n");
110 rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA* key)
112 char *inbuf, *outbuf;
115 if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
116 fatal("rsa_public_encrypt() exponent too small or not odd");
118 olen = BN_num_bytes(key->n);
119 outbuf = xmalloc(olen);
121 ilen = BN_num_bytes(in);
122 inbuf = xmalloc(ilen);
123 BN_bn2bin(in, inbuf);
125 if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
126 RSA_PKCS1_PADDING)) <= 0)
127 fatal("rsa_public_encrypt() failed");
129 BN_bin2bn(outbuf, len, out);
131 memset(outbuf, 0, olen);
132 memset(inbuf, 0, ilen);
138 rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
140 char *inbuf, *outbuf;
143 olen = BN_num_bytes(key->n);
144 outbuf = xmalloc(olen);
146 ilen = BN_num_bytes(in);
147 inbuf = xmalloc(ilen);
148 BN_bn2bin(in, inbuf);
150 if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
151 RSA_SSLV23_PADDING)) <= 0)
152 fatal("rsa_private_decrypt() failed");
154 BN_bin2bn(outbuf, len, out);
156 memset(outbuf, 0, olen);
157 memset(inbuf, 0, ilen);
162 /* Set whether to output verbose messages during key generation. */
165 rsa_set_verbose(int verbose)
167 rsa_verbose = verbose;