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GNU/Linux |
RedHat 9.0(Shrike) |
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RSA_generate_key(3ssl) |
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RSA_generate_key − generate RSA key pair
#include <openssl/rsa.h>
RSA *RSA_generate_key(int num, unsigned long e,
void (*callback)(int,int,void *), void *cb_arg);
RSA_generate_key() generates a key pair and returns it in a newly allocated RSA structure. The pseudo-random number generator must be seeded prior to calling RSA_generate_key().
The modulus size will be num bits, and the public exponent will be e. Key sizes with num < 1024 should be considered insecure. The exponent is an odd number, typically 3, 17 or 65537.
A callback function may be used to provide feedback about the progress of the key generation. If callback is not NULL , it will be called as follows:
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While a random prime number is generated, it is called as described in BN_generate_prime(3). | ||
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When the n−th randomly generated prime is rejected as not suitable for the key, callback(2, n, cb_arg) is called. | ||
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When a random p has been found with p−1 relatively prime to e, it is called as callback(3, 0, cb_arg). |
The process is then repeated for prime q with callback(3, 1, cb_arg).
If key generation fails, RSA_generate_key() returns NULL ; the error codes can be obtained by ERR_get_error(3).
callback(2, x, cb_arg) is used with two different meanings.
RSA_generate_key() goes into an infinite loop for illegal input values.
ERR_get_error(3), rand(3), rsa(3), RSA_free(3)
The cb_arg argument was added in SSLeay 0.9.0.
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RSA_generate_key(3ssl) | |