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| 124 | .\" ======================================================================== |
| 125 | .\" |
| 126 | .IX Title "RSA_padding_add_PKCS1_type_1 3" |
| 127 | .TH RSA_padding_add_PKCS1_type_1 3 "2010-12-02" "1.0.0c" "OpenSSL" |
| 128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 129 | .\" way too many mistakes in technical documents. |
| 130 | .if n .ad l |
| 131 | .nh |
| 132 | .SH "NAME" |
| 133 | RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1, |
| 134 | RSA_padding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2, |
| 135 | RSA_padding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP, |
| 136 | RSA_padding_add_SSLv23, RSA_padding_check_SSLv23, |
| 137 | RSA_padding_add_none, RSA_padding_check_none \- asymmetric encryption |
| 138 | padding |
| 139 | .SH "SYNOPSIS" |
| 140 | .IX Header "SYNOPSIS" |
| 141 | .Vb 1 |
| 142 | \& #include <openssl/rsa.h> |
| 143 | \& |
| 144 | \& int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, |
| 145 | \& unsigned char *f, int fl); |
| 146 | \& |
| 147 | \& int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen, |
| 148 | \& unsigned char *f, int fl, int rsa_len); |
| 149 | \& |
| 150 | \& int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, |
| 151 | \& unsigned char *f, int fl); |
| 152 | \& |
| 153 | \& int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen, |
| 154 | \& unsigned char *f, int fl, int rsa_len); |
| 155 | \& |
| 156 | \& int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen, |
| 157 | \& unsigned char *f, int fl, unsigned char *p, int pl); |
| 158 | \& |
| 159 | \& int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen, |
| 160 | \& unsigned char *f, int fl, int rsa_len, unsigned char *p, int pl); |
| 161 | \& |
| 162 | \& int RSA_padding_add_SSLv23(unsigned char *to, int tlen, |
| 163 | \& unsigned char *f, int fl); |
| 164 | \& |
| 165 | \& int RSA_padding_check_SSLv23(unsigned char *to, int tlen, |
| 166 | \& unsigned char *f, int fl, int rsa_len); |
| 167 | \& |
| 168 | \& int RSA_padding_add_none(unsigned char *to, int tlen, |
| 169 | \& unsigned char *f, int fl); |
| 170 | \& |
| 171 | \& int RSA_padding_check_none(unsigned char *to, int tlen, |
| 172 | \& unsigned char *f, int fl, int rsa_len); |
| 173 | .Ve |
| 174 | .SH "DESCRIPTION" |
| 175 | .IX Header "DESCRIPTION" |
| 176 | The \fIRSA_padding_xxx_xxx()\fR functions are called from the \s-1RSA\s0 encrypt, |
| 177 | decrypt, sign and verify functions. Normally they should not be called |
| 178 | from application programs. |
| 179 | .PP |
| 180 | However, they can also be called directly to implement padding for other |
| 181 | asymmetric ciphers. \fIRSA_padding_add_PKCS1_OAEP()\fR and |
| 182 | \&\fIRSA_padding_check_PKCS1_OAEP()\fR may be used in an application combined |
| 183 | with \fB\s-1RSA_NO_PADDING\s0\fR in order to implement \s-1OAEP\s0 with an encoding |
| 184 | parameter. |
| 185 | .PP |
| 186 | \&\fIRSA_padding_add_xxx()\fR encodes \fBfl\fR bytes from \fBf\fR so as to fit into |
| 187 | \&\fBtlen\fR bytes and stores the result at \fBto\fR. An error occurs if \fBfl\fR |
| 188 | does not meet the size requirements of the encoding method. |
| 189 | .PP |
| 190 | The following encoding methods are implemented: |
| 191 | .IP "PKCS1_type_1" 4 |
| 192 | .IX Item "PKCS1_type_1" |
| 193 | \&\s-1PKCS\s0 #1 v2.0 EMSA\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 1); used for signatures |
| 194 | .IP "PKCS1_type_2" 4 |
| 195 | .IX Item "PKCS1_type_2" |
| 196 | \&\s-1PKCS\s0 #1 v2.0 EME\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 2) |
| 197 | .IP "\s-1PKCS1_OAEP\s0" 4 |
| 198 | .IX Item "PKCS1_OAEP" |
| 199 | \&\s-1PKCS\s0 #1 v2.0 EME-OAEP |
| 200 | .IP "SSLv23" 4 |
| 201 | .IX Item "SSLv23" |
| 202 | \&\s-1PKCS\s0 #1 EME\-PKCS1\-v1_5 with SSL-specific modification |
| 203 | .IP "none" 4 |
| 204 | .IX Item "none" |
| 205 | simply copy the data |
| 206 | .PP |
| 207 | The random number generator must be seeded prior to calling |
| 208 | \&\fIRSA_padding_add_xxx()\fR. |
| 209 | .PP |
| 210 | \&\fIRSA_padding_check_xxx()\fR verifies that the \fBfl\fR bytes at \fBf\fR contain |
| 211 | a valid encoding for a \fBrsa_len\fR byte \s-1RSA\s0 key in the respective |
| 212 | encoding method and stores the recovered data of at most \fBtlen\fR bytes |
| 213 | (for \fB\s-1RSA_NO_PADDING\s0\fR: of size \fBtlen\fR) |
| 214 | at \fBto\fR. |
| 215 | .PP |
| 216 | For \fIRSA_padding_xxx_OAEP()\fR, \fBp\fR points to the encoding parameter |
| 217 | of length \fBpl\fR. \fBp\fR may be \fB\s-1NULL\s0\fR if \fBpl\fR is 0. |
| 218 | .SH "RETURN VALUES" |
| 219 | .IX Header "RETURN VALUES" |
| 220 | The \fIRSA_padding_add_xxx()\fR functions return 1 on success, 0 on error. |
| 221 | The \fIRSA_padding_check_xxx()\fR functions return the length of the |
| 222 | recovered data, \-1 on error. Error codes can be obtained by calling |
| 223 | \&\fIERR_get_error\fR\|(3). |
| 224 | .SH "SEE ALSO" |
| 225 | .IX Header "SEE ALSO" |
| 226 | \&\fIRSA_public_encrypt\fR\|(3), |
| 227 | \&\fIRSA_private_decrypt\fR\|(3), |
| 228 | \&\fIRSA_sign\fR\|(3), \fIRSA_verify\fR\|(3) |
| 229 | .SH "HISTORY" |
| 230 | .IX Header "HISTORY" |
| 231 | \&\fIRSA_padding_add_PKCS1_type_1()\fR, \fIRSA_padding_check_PKCS1_type_1()\fR, |
| 232 | \&\fIRSA_padding_add_PKCS1_type_2()\fR, \fIRSA_padding_check_PKCS1_type_2()\fR, |
| 233 | \&\fIRSA_padding_add_SSLv23()\fR, \fIRSA_padding_check_SSLv23()\fR, |
| 234 | \&\fIRSA_padding_add_none()\fR and \fIRSA_padding_check_none()\fR appeared in |
| 235 | SSLeay 0.9.0. |
| 236 | .PP |
| 237 | \&\fIRSA_padding_add_PKCS1_OAEP()\fR and \fIRSA_padding_check_PKCS1_OAEP()\fR were |
| 238 | added in OpenSSL 0.9.2b. |