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135 .IX Title "RSA_public_encrypt 3"
136 .TH RSA_public_encrypt 3 "2015-12-03" "1.0.1q" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 RSA_public_encrypt, RSA_private_decrypt \- RSA public key cryptography
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/rsa.h>
148 \& int RSA_public_encrypt(int flen, unsigned char *from,
149 \& unsigned char *to, RSA *rsa, int padding);
151 \& int RSA_private_decrypt(int flen, unsigned char *from,
152 \& unsigned char *to, RSA *rsa, int padding);
155 .IX Header "DESCRIPTION"
156 \&\fIRSA_public_encrypt()\fR encrypts the \fBflen\fR bytes at \fBfrom\fR (usually a
157 session key) using the public key \fBrsa\fR and stores the ciphertext in
158 \&\fBto\fR. \fBto\fR must point to RSA_size(\fBrsa\fR) bytes of memory.
160 \&\fBpadding\fR denotes one of the following modes:
161 .IP "\s-1RSA_PKCS1_PADDING\s0" 4
162 .IX Item "RSA_PKCS1_PADDING"
163 \&\s-1PKCS\s0 #1 v1.5 padding. This currently is the most widely used mode.
164 .IP "\s-1RSA_PKCS1_OAEP_PADDING\s0" 4
165 .IX Item "RSA_PKCS1_OAEP_PADDING"
166 EME-OAEP as defined in \s-1PKCS\s0 #1 v2.0 with \s-1SHA\-1, MGF1\s0 and an empty
167 encoding parameter. This mode is recommended for all new applications.
168 .IP "\s-1RSA_SSLV23_PADDING\s0" 4
169 .IX Item "RSA_SSLV23_PADDING"
170 \&\s-1PKCS\s0 #1 v1.5 padding with an SSL-specific modification that denotes
171 that the server is \s-1SSL3\s0 capable.
172 .IP "\s-1RSA_NO_PADDING\s0" 4
173 .IX Item "RSA_NO_PADDING"
174 Raw \s-1RSA\s0 encryption. This mode should \fIonly\fR be used to implement
175 cryptographically sound padding modes in the application code.
176 Encrypting user data directly with \s-1RSA\s0 is insecure.
178 \&\fBflen\fR must be less than RSA_size(\fBrsa\fR) \- 11 for the \s-1PKCS\s0 #1 v1.5
179 based padding modes, less than RSA_size(\fBrsa\fR) \- 41 for
180 \&\s-1RSA_PKCS1_OAEP_PADDING\s0 and exactly RSA_size(\fBrsa\fR) for \s-1RSA_NO_PADDING.\s0
181 The random number generator must be seeded prior to calling
182 \&\fIRSA_public_encrypt()\fR.
184 \&\fIRSA_private_decrypt()\fR decrypts the \fBflen\fR bytes at \fBfrom\fR using the
185 private key \fBrsa\fR and stores the plaintext in \fBto\fR. \fBto\fR must point
186 to a memory section large enough to hold the decrypted data (which is
187 smaller than RSA_size(\fBrsa\fR)). \fBpadding\fR is the padding mode that
188 was used to encrypt the data.
190 .IX Header "RETURN VALUES"
191 \&\fIRSA_public_encrypt()\fR returns the size of the encrypted data (i.e.,
192 RSA_size(\fBrsa\fR)). \fIRSA_private_decrypt()\fR returns the size of the
195 On error, \-1 is returned; the error codes can be
196 obtained by \fIERR_get_error\fR\|(3).
198 .IX Header "CONFORMING TO"
199 \&\s-1SSL, PKCS\s0 #1 v2.0
201 .IX Header "SEE ALSO"
202 \&\fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIrsa\fR\|(3),
203 \&\fIRSA_size\fR\|(3)
206 The \fBpadding\fR argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is
207 available since SSLeay 0.9.0, \s-1OAEP\s0 was added in OpenSSL 0.9.2b.