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136 .TH rsa 3 "2015-01-08" "0.9.8zd" "OpenSSL"
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142 rsa \- RSA public key cryptosystem
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/rsa.h>
147 \& #include <openssl/engine.h>
149 \& RSA * RSA_new(void);
150 \& void RSA_free(RSA *rsa);
152 \& int RSA_public_encrypt(int flen, unsigned char *from,
153 \& unsigned char *to, RSA *rsa, int padding);
154 \& int RSA_private_decrypt(int flen, unsigned char *from,
155 \& unsigned char *to, RSA *rsa, int padding);
156 \& int RSA_private_encrypt(int flen, unsigned char *from,
157 \& unsigned char *to, RSA *rsa,int padding);
158 \& int RSA_public_decrypt(int flen, unsigned char *from,
159 \& unsigned char *to, RSA *rsa,int padding);
161 \& int RSA_sign(int type, unsigned char *m, unsigned int m_len,
162 \& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
163 \& int RSA_verify(int type, unsigned char *m, unsigned int m_len,
164 \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
166 \& int RSA_size(const RSA *rsa);
168 \& RSA *RSA_generate_key(int num, unsigned long e,
169 \& void (*callback)(int,int,void *), void *cb_arg);
171 \& int RSA_check_key(RSA *rsa);
173 \& int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
174 \& void RSA_blinding_off(RSA *rsa);
176 \& void RSA_set_default_method(const RSA_METHOD *meth);
177 \& const RSA_METHOD *RSA_get_default_method(void);
178 \& int RSA_set_method(RSA *rsa, const RSA_METHOD *meth);
179 \& const RSA_METHOD *RSA_get_method(const RSA *rsa);
180 \& RSA_METHOD *RSA_PKCS1_SSLeay(void);
181 \& RSA_METHOD *RSA_null_method(void);
182 \& int RSA_flags(const RSA *rsa);
183 \& RSA *RSA_new_method(ENGINE *engine);
185 \& int RSA_print(BIO *bp, RSA *x, int offset);
186 \& int RSA_print_fp(FILE *fp, RSA *x, int offset);
188 \& int RSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
189 \& int (*dup_func)(), void (*free_func)());
190 \& int RSA_set_ex_data(RSA *r,int idx,char *arg);
191 \& char *RSA_get_ex_data(RSA *r, int idx);
193 \& int RSA_sign_ASN1_OCTET_STRING(int dummy, unsigned char *m,
194 \& unsigned int m_len, unsigned char *sigret, unsigned int *siglen,
196 \& int RSA_verify_ASN1_OCTET_STRING(int dummy, unsigned char *m,
197 \& unsigned int m_len, unsigned char *sigbuf, unsigned int siglen,
201 .IX Header "DESCRIPTION"
202 These functions implement \s-1RSA\s0 public key encryption and signatures
203 as defined in \s-1PKCS\s0 #1 v2.0 [\s-1RFC 2437\s0].
205 The \fB\s-1RSA\s0\fR structure consists of several \s-1BIGNUM\s0 components. It can
206 contain public as well as private \s-1RSA\s0 keys:
211 \& BIGNUM *n; // public modulus
212 \& BIGNUM *e; // public exponent
213 \& BIGNUM *d; // private exponent
214 \& BIGNUM *p; // secret prime factor
215 \& BIGNUM *q; // secret prime factor
216 \& BIGNUM *dmp1; // d mod (p\-1)
217 \& BIGNUM *dmq1; // d mod (q\-1)
218 \& BIGNUM *iqmp; // q^\-1 mod p
224 In public keys, the private exponent and the related secret values are
227 \&\fBp\fR, \fBq\fR, \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR may be \fB\s-1NULL\s0\fR in private
228 keys, but the \s-1RSA\s0 operations are much faster when these values are
231 Note that \s-1RSA\s0 keys may use non-standard \fB\s-1RSA_METHOD\s0\fR implementations,
232 either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an
233 \&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 values
234 will not be used by the implementation or may be used for alternative data
235 storage. For this reason, applications should generally avoid using \s-1RSA\s0
236 structure elements directly and instead use \s-1API\s0 functions to query or
239 .IX Header "CONFORMING TO"
240 \&\s-1SSL, PKCS\s0 #1 v2.0
243 \&\s-1RSA\s0 was covered by a \s-1US\s0 patent which expired in September 2000.
245 .IX Header "SEE ALSO"
246 \&\fIrsa\fR\|(1), \fIbn\fR\|(3), \fIdsa\fR\|(3), \fIdh\fR\|(3),
247 \&\fIrand\fR\|(3), \fIengine\fR\|(3), \fIRSA_new\fR\|(3),
248 \&\fIRSA_public_encrypt\fR\|(3),
249 \&\fIRSA_sign\fR\|(3), \fIRSA_size\fR\|(3),
250 \&\fIRSA_generate_key\fR\|(3),
251 \&\fIRSA_check_key\fR\|(3),
252 \&\fIRSA_blinding_on\fR\|(3),
253 \&\fIRSA_set_method\fR\|(3), \fIRSA_print\fR\|(3),
254 \&\fIRSA_get_ex_new_index\fR\|(3),
255 \&\fIRSA_private_encrypt\fR\|(3),
256 \&\fIRSA_sign_ASN1_OCTET_STRING\fR\|(3),
257 \&\fIRSA_padding_add_PKCS1_type_1\fR\|(3)