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RSA_public_encrypt(3)
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RSA_public_encrypt, RSA_private_decrypt - RSA public key
cryptography
#include <openssl/rsa.h>
int RSA_public_encrypt(
int flen,
unsigned char *from,
unsigned char *to,
RSA *rsa,
int padding ); int RSA_private_decrypt(
int flen,
unsigned char *from,
unsigned char *to,
RSA *rsa,
int padding );
The RSA_public_encrypt() function encrypts the flen bytes
at from (usually a session key) using the public key rsa
and stores the ciphertext in to. The to must point to
RSA_size(rsa) bytes of memory.
The padding denotes one of the following modes: PKCS #1
v1.5 padding. This currently is the most widely used mode.
EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1 and
an empty encoding parameter. This mode is recommended for
all new applications. PKCS #1 v1.5 padding with an SSLspecific
modification that denotes that the server is SSL3
capable. Raw RSA encryption. This mode should only be
used to implement cryptographically sound padding modes in
the application code. Encrypting user data directly with
RSA is insecure.
The flen must be less than RSA_size(rsa) - 11 for the PKCS
#1 v1.5 based padding modes, and less than RSA_size(rsa) -
41 for RSA_PKCS1_OAEP_PADDING. The random number generator
must be seeded prior to calling the RSA_public_encrypt()
function.
The RSA_private_decrypt() function decrypts the flen bytes
at from using the private key rsa and stores the plaintext
in to. The to must point to a memory section large enough
to hold the decrypted data , which is smaller than
RSA_size(rsa). The padding is the padding mode that was
used to encrypt the data.
These functions conform to SSL, PKCS #1 v2.0.
The RSA_PKCS1_RSAref(3) method supports only the
RSA_PKCS1_PADDING mode.
The RSA_public_encrypt() function returns the size of the
encrypted data, RSA_size(rsa). The RSA_private_decrypt()
function returns the size of the recovered plaintext.
On error, -1 is returned; the error codes can be obtained
by using the ERR_get_error() function.
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.
Functions: err(3), rand_ssl(3), rsa(3), RSA_size(3)
RSA_public_encrypt(3)
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