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131 .IX Title "RSA_padding_add_PKCS1_type_1 3"
132 .TH RSA_padding_add_PKCS1_type_1 3 "2009-07-23" "0.9.8k" "OpenSSL"
133 .SH "NAME"
134 RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1,
135 RSA_padding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2,
136 RSA_padding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP,
137 RSA_padding_add_SSLv23, RSA_padding_check_SSLv23,
138 RSA_padding_add_none, RSA_padding_check_none \- asymmetric encryption
139 padding
140 .SH "SYNOPSIS"
141 .IX Header "SYNOPSIS"
142 .Vb 1
143 \& #include <openssl/rsa.h>
144 .Ve
145 .PP
146 .Vb 2
147 \& int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
148 \& unsigned char *f, int fl);
149 .Ve
150 .PP
151 .Vb 2
152 \& int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
153 \& unsigned char *f, int fl, int rsa_len);
154 .Ve
155 .PP
156 .Vb 2
157 \& int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
158 \& unsigned char *f, int fl);
159 .Ve
160 .PP
161 .Vb 2
162 \& int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
163 \& unsigned char *f, int fl, int rsa_len);
164 .Ve
165 .PP
166 .Vb 2
167 \& int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
168 \& unsigned char *f, int fl, unsigned char *p, int pl);
169 .Ve
170 .PP
171 .Vb 2
172 \& int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
173 \& unsigned char *f, int fl, int rsa_len, unsigned char *p, int pl);
174 .Ve
175 .PP
176 .Vb 2
177 \& int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
178 \& unsigned char *f, int fl);
179 .Ve
180 .PP
181 .Vb 2
182 \& int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
183 \& unsigned char *f, int fl, int rsa_len);
184 .Ve
185 .PP
186 .Vb 2
187 \& int RSA_padding_add_none(unsigned char *to, int tlen,
188 \& unsigned char *f, int fl);
189 .Ve
190 .PP
191 .Vb 2
192 \& int RSA_padding_check_none(unsigned char *to, int tlen,
193 \& unsigned char *f, int fl, int rsa_len);
194 .Ve
195 .SH "DESCRIPTION"
196 .IX Header "DESCRIPTION"
197 The \fIRSA_padding_xxx_xxx()\fR functions are called from the \s-1RSA\s0 encrypt,
198 decrypt, sign and verify functions. Normally they should not be called
199 from application programs.
200 .PP
201 However, they can also be called directly to implement padding for other
202 asymmetric ciphers. \fIRSA_padding_add_PKCS1_OAEP()\fR and
203 \&\fIRSA_padding_check_PKCS1_OAEP()\fR may be used in an application combined
204 with \fB\s-1RSA_NO_PADDING\s0\fR in order to implement \s-1OAEP\s0 with an encoding
205 parameter.
206 .PP
207 \&\fIRSA_padding_add_xxx()\fR encodes \fBfl\fR bytes from \fBf\fR so as to fit into
208 \&\fBtlen\fR bytes and stores the result at \fBto\fR. An error occurs if \fBfl\fR
209 does not meet the size requirements of the encoding method.
210 .PP
211 The following encoding methods are implemented:
212 .IP "PKCS1_type_1" 4
213 .IX Item "PKCS1_type_1"
214 \&\s-1PKCS\s0 #1 v2.0 EMSA\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 1); used for signatures
215 .IP "PKCS1_type_2" 4
216 .IX Item "PKCS1_type_2"
217 \&\s-1PKCS\s0 #1 v2.0 EME\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 2)
218 .IP "\s-1PKCS1_OAEP\s0" 4
219 .IX Item "PKCS1_OAEP"
220 \&\s-1PKCS\s0 #1 v2.0 EME-OAEP
221 .IP "SSLv23" 4
222 .IX Item "SSLv23"
223 \&\s-1PKCS\s0 #1 EME\-PKCS1\-v1_5 with SSL-specific modification
224 .IP "none" 4
225 .IX Item "none"
226 simply copy the data
227 .PP
228 The random number generator must be seeded prior to calling
229 \&\fIRSA_padding_add_xxx()\fR.
230 .PP
231 \&\fIRSA_padding_check_xxx()\fR verifies that the \fBfl\fR bytes at \fBf\fR contain
232 a valid encoding for a \fBrsa_len\fR byte \s-1RSA\s0 key in the respective
233 encoding method and stores the recovered data of at most \fBtlen\fR bytes
234 (for \fB\s-1RSA_NO_PADDING\s0\fR: of size \fBtlen\fR)
235 at \fBto\fR.
236 .PP
237 For \fIRSA_padding_xxx_OAEP()\fR, \fBp\fR points to the encoding parameter
238 of length \fBpl\fR. \fBp\fR may be \fB\s-1NULL\s0\fR if \fBpl\fR is 0.
239 .SH "RETURN VALUES"
240 .IX Header "RETURN VALUES"
241 The \fIRSA_padding_add_xxx()\fR functions return 1 on success, 0 on error.
242 The \fIRSA_padding_check_xxx()\fR functions return the length of the
243 recovered data, \-1 on error. Error codes can be obtained by calling
244 \&\fIERR_get_error\fR\|(3).
245 .SH "SEE ALSO"
246 .IX Header "SEE ALSO"
247 \&\fIRSA_public_encrypt\fR\|(3),
248 \&\fIRSA_private_decrypt\fR\|(3),
249 \&\fIRSA_sign\fR\|(3), \fIRSA_verify\fR\|(3)
250 .SH "HISTORY"
251 .IX Header "HISTORY"
252 \&\fIRSA_padding_add_PKCS1_type_1()\fR, \fIRSA_padding_check_PKCS1_type_1()\fR,
253 \&\fIRSA_padding_add_PKCS1_type_2()\fR, \fIRSA_padding_check_PKCS1_type_2()\fR,
254 \&\fIRSA_padding_add_SSLv23()\fR, \fIRSA_padding_check_SSLv23()\fR,
255 \&\fIRSA_padding_add_none()\fR and \fIRSA_padding_check_none()\fR appeared in
256 SSLeay 0.9.0.
257 .PP
258 \&\fIRSA_padding_add_PKCS1_OAEP()\fR and \fIRSA_padding_check_PKCS1_OAEP()\fR were
259 added in OpenSSL 0.9.2b.