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131 .IX Title "RSA_PADDING_ADD_PKCS1_TYPE_1 3"
132 .TH RSA_PADDING_ADD_PKCS1_TYPE_1 3 "2018-09-11" "1.1.1" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1, RSA_padding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2, RSA_padding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP, RSA_padding_add_SSLv23, RSA_padding_check_SSLv23, RSA_padding_add_none, RSA_padding_check_none \- asymmetric encryption padding
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/rsa.h>
144 \& int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
145 \& unsigned char *f, int fl);
147 \& int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
148 \& unsigned char *f, int fl, int rsa_len);
150 \& int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
151 \& unsigned char *f, int fl);
153 \& int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
154 \& unsigned char *f, int fl, int rsa_len);
156 \& int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
157 \& unsigned char *f, int fl, unsigned char *p, int pl);
159 \& int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
160 \& unsigned char *f, int fl, int rsa_len,
161 \& unsigned char *p, int pl);
163 \& int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
164 \& unsigned char *f, int fl);
166 \& int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
167 \& unsigned char *f, int fl, int rsa_len);
169 \& int RSA_padding_add_none(unsigned char *to, int tlen,
170 \& unsigned char *f, int fl);
172 \& int RSA_padding_check_none(unsigned char *to, int tlen,
173 \& unsigned char *f, int fl, int rsa_len);
176 .IX Header "DESCRIPTION"
177 The \fIRSA_padding_xxx_xxx()\fR functions are called from the \s-1RSA\s0 encrypt,
178 decrypt, sign and verify functions. Normally they should not be called
179 from application programs.
181 However, they can also be called directly to implement padding for other
182 asymmetric ciphers. \fIRSA_padding_add_PKCS1_OAEP()\fR and
183 \&\fIRSA_padding_check_PKCS1_OAEP()\fR may be used in an application combined
184 with \fB\s-1RSA_NO_PADDING\s0\fR in order to implement \s-1OAEP\s0 with an encoding
187 \&\fIRSA_padding_add_xxx()\fR encodes \fBfl\fR bytes from \fBf\fR so as to fit into
188 \&\fBtlen\fR bytes and stores the result at \fBto\fR. An error occurs if \fBfl\fR
189 does not meet the size requirements of the encoding method.
191 The following encoding methods are implemented:
193 .IX Item "PKCS1_type_1"
194 \&\s-1PKCS\s0 #1 v2.0 EMSA\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 1); used for signatures
196 .IX Item "PKCS1_type_2"
197 \&\s-1PKCS\s0 #1 v2.0 EME\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 2)
198 .IP "\s-1PKCS1_OAEP\s0" 4
199 .IX Item "PKCS1_OAEP"
200 \&\s-1PKCS\s0 #1 v2.0 EME-OAEP
203 \&\s-1PKCS\s0 #1 EME\-PKCS1\-v1_5 with SSL-specific modification
208 The random number generator must be seeded prior to calling
209 \&\fIRSA_padding_add_xxx()\fR.
211 \&\fIRSA_padding_check_xxx()\fR verifies that the \fBfl\fR bytes at \fBf\fR contain
212 a valid encoding for a \fBrsa_len\fR byte \s-1RSA\s0 key in the respective
213 encoding method and stores the recovered data of at most \fBtlen\fR bytes
214 (for \fB\s-1RSA_NO_PADDING\s0\fR: of size \fBtlen\fR)
217 For \fIRSA_padding_xxx_OAEP()\fR, \fBp\fR points to the encoding parameter
218 of length \fBpl\fR. \fBp\fR may be \fB\s-1NULL\s0\fR if \fBpl\fR is 0.
220 .IX Header "RETURN VALUES"
221 The \fIRSA_padding_add_xxx()\fR functions return 1 on success, 0 on error.
222 The \fIRSA_padding_check_xxx()\fR functions return the length of the
223 recovered data, \-1 on error. Error codes can be obtained by calling
224 \&\fIERR_get_error\fR\|(3).
227 The \fIRSA_padding_check_PKCS1_type_2()\fR padding check leaks timing
228 information which can potentially be used to mount a Bleichenbacher
229 padding oracle attack. This is an inherent weakness in the \s-1PKCS\s0 #1
230 v1.5 padding design. Prefer \s-1PKCS1_OAEP\s0 padding.
232 .IX Header "SEE ALSO"
233 \&\fIRSA_public_encrypt\fR\|(3),
234 \&\fIRSA_private_decrypt\fR\|(3),
235 \&\fIRSA_sign\fR\|(3), \fIRSA_verify\fR\|(3)
237 .IX Header "COPYRIGHT"
238 Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
240 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
241 this file except in compliance with the License. You can obtain a copy
242 in the file \s-1LICENSE\s0 in the source distribution or at
243 <https://www.openssl.org/source/license.html>.