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2186cd8e UM |
1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
665d899f PY |
5 | RSA_generate_key_ex, RSA_generate_key, |
6 | RSA_generate_multi_prime_key - generate RSA key pair | |
2186cd8e UM |
7 | |
8 | =head1 SYNOPSIS | |
9 | ||
10 | #include <openssl/rsa.h> | |
11 | ||
aafbe1cc | 12 | int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb); |
665d899f | 13 | int RSA_generate_multi_prime_key(RSA *rsa, int bits, int primes, BIGNUM *e, BN_GENCB *cb); |
aafbe1cc MC |
14 | |
15 | Deprecated: | |
16 | ||
98186eb4 | 17 | #if OPENSSL_API_COMPAT < 0x00908000L |
2186cd8e | 18 | RSA *RSA_generate_key(int num, unsigned long e, |
e9b77246 | 19 | void (*callback)(int, int, void *), void *cb_arg); |
98186eb4 | 20 | #endif |
2186cd8e UM |
21 | |
22 | =head1 DESCRIPTION | |
23 | ||
665d899f PY |
24 | RSA_generate_key_ex() generates a 2-prime RSA key pair and stores it in the |
25 | B<RSA> structure provided in B<rsa>. The pseudo-random number generator must | |
aafbe1cc | 26 | be seeded prior to calling RSA_generate_key_ex(). |
2186cd8e | 27 | |
665d899f PY |
28 | RSA_generate_multi_prime_key() generates a multi-prime RSA key pair and stores |
29 | it in the B<RSA> structure provided in B<rsa>. The number of primes is given by | |
30 | the B<primes> parameter. The pseudo-random number generator must be seeded prior | |
31 | to calling RSA_generate_multi_prime_key(). | |
32 | ||
33 | The modulus size will be of length B<bits>, the number of primes to form the | |
34 | modulus will be B<primes>, and the public exponent will be B<e>. Key sizes | |
35 | with B<num> E<lt> 1024 should be considered insecure. The exponent is an odd | |
36 | number, typically 3, 17 or 65537. | |
2186cd8e | 37 | |
3bded9cd AP |
38 | In order to maintain adequate security level, the maximum number of permitted |
39 | B<primes> depends on modulus bit length: | |
40 | ||
41 | <1024 | >=1024 | >=4096 | >=8192 | |
42 | ------+--------+--------+------- | |
43 | 2 | 3 | 4 | 5 | |
44 | ||
2186cd8e | 45 | A callback function may be used to provide feedback about the |
aafbe1cc MC |
46 | progress of the key generation. If B<cb> is not B<NULL>, it |
47 | will be called as follows using the BN_GENCB_call() function | |
9b86974e | 48 | described on the L<BN_generate_prime(3)> page. |
2186cd8e | 49 | |
b3696a55 RS |
50 | RSA_generate_prime() is similar to RSA_generate_prime_ex() but |
51 | expects an old-style callback function; see | |
52 | L<BN_generate_prime(3)> for information on the old-style callback. | |
53 | ||
2f61bc2e | 54 | =over 2 |
2186cd8e UM |
55 | |
56 | =item * | |
57 | ||
58 | While a random prime number is generated, it is called as | |
9b86974e | 59 | described in L<BN_generate_prime(3)>. |
2186cd8e UM |
60 | |
61 | =item * | |
62 | ||
63 | When the n-th randomly generated prime is rejected as not | |
aafbe1cc | 64 | suitable for the key, B<BN_GENCB_call(cb, 2, n)> is called. |
2186cd8e UM |
65 | |
66 | =item * | |
67 | ||
68 | When a random p has been found with p-1 relatively prime to B<e>, | |
aafbe1cc | 69 | it is called as B<BN_GENCB_call(cb, 3, 0)>. |
2186cd8e UM |
70 | |
71 | =back | |
72 | ||
665d899f PY |
73 | The process is then repeated for prime q and other primes (if any) |
74 | with B<BN_GENCB_call(cb, 3, i)> where B<i> indicates the i-th prime. | |
aafbe1cc | 75 | |
1f13ad31 | 76 | =head1 RETURN VALUES |
2186cd8e | 77 | |
665d899f | 78 | RSA_generate_multi_prime_key() returns 1 on success or 0 on error. |
bb6c5e7f | 79 | RSA_generate_key_ex() returns 1 on success or 0 on error. |
9b86974e | 80 | The error codes can be obtained by L<ERR_get_error(3)>. |
2186cd8e | 81 | |
b3696a55 RS |
82 | RSA_generate_key() returns a pointer to the RSA structure or |
83 | B<NULL> if the key generation fails. | |
84 | ||
2186cd8e UM |
85 | =head1 BUGS |
86 | ||
aafbe1cc | 87 | B<BN_GENCB_call(cb, 2, x)> is used with two different meanings. |
2186cd8e | 88 | |
2186cd8e UM |
89 | =head1 SEE ALSO |
90 | ||
3bded9cd | 91 | L<ERR_get_error(3)>, L<RAND_bytes(3)>, L<BN_generate_prime(3)> |
b3696a55 RS |
92 | |
93 | =head1 HISTORY | |
94 | ||
95 | RSA_generate_key() was deprecated in OpenSSL 0.9.8; use | |
96 | RSA_generate_key_ex() intsead. | |
2186cd8e | 97 | |
e2f92610 RS |
98 | =head1 COPYRIGHT |
99 | ||
61f805c1 | 100 | Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. |
e2f92610 RS |
101 | |
102 | Licensed under the OpenSSL license (the "License"). You may not use | |
103 | this file except in compliance with the License. You can obtain a copy | |
104 | in the file LICENSE in the source distribution or at | |
105 | L<https://www.openssl.org/source/license.html>. | |
106 | ||
107 | =cut |