RSA_PUBLIC_ENCRYPT(3) | Library Functions Manual | RSA_PUBLIC_ENCRYPT(3) |
RSA_public_encrypt
,
RSA_private_decrypt
— RSA
public key cryptography
#include
<openssl/rsa.h>
int
RSA_public_encrypt
(int flen,
const unsigned char *from, unsigned
char *to, RSA *rsa, int
padding);
int
RSA_private_decrypt
(int flen,
const unsigned char *from, unsigned
char *to, RSA *rsa, int
padding);
RSA_public_encrypt
()
encrypts the flen bytes at from
(usually a session key) using the public key rsa and
stores the ciphertext in to. to
must point to RSA_size
(rsa)
bytes of memory.
padding denotes one of the following modes:
RSA_PKCS1_PADDING
RSA_PKCS1_OAEP_PADDING
RSA_SSLV23_PADDING
RSA_NO_PADDING
flen must be less than
RSA_size
(rsa)
- 11 for the PKCS #1 v1.5 based padding modes, less than
RSA_size
(rsa) - 41 for
RSA_PKCS1_OAEP_PADDING
and exactly
RSA_size
(rsa) for
RSA_NO_PADDING
.
RSA_private_decrypt
()
decrypts the flen bytes at from
using the private key rsa and stores the plaintext in
to. to must point to a memory
section large enough to hold the decrypted data (which is smaller than
RSA_size
(rsa)).
padding is the padding mode that was used to encrypt
the data.
RSA_public_encrypt
() returns the size of
the encrypted data (i.e.
RSA_size
(rsa)).
RSA_private_decrypt
() returns the size of the
recovered plaintext.
On error, -1 is returned; the error codes can be obtained by ERR_get_error(3).
SSL, PKCS #1 v2.0
The padding argument was added in SSLeay
0.8. RSA_NO_PADDING
is available since SSLeay 0.9.0.
OAEP was added in OpenSSL 0.9.2b.
March 25, 2017 | OpenBSD-6.1 |