RSA_PUBLIC_ENCRYPT(3) OpenSSL RSA_PUBLIC_ENCRYPT(3)

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);

RSA_public_encrypt() encrypts theflenbytes atfrom(usu- ally a session key) using the public keyrsaand stores the ciphertext into. tomust point to RSA_size(rsa) bytes of memory.paddingdenotes one of the following modes: RSA_PKCS1_PADDING PKCS #1 v1.5 padding. This currently is the most widely used mode. RSA_PKCS1_OAEP_PADDING 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. RSA_SSLV23_PADDING PKCS #1 v1.5 padding with an SSL-specific modification that denotes that the server is SSL3 capable. RSA_NO_PADDING Raw RSA encryption. This mode shouldonlybe used to implement cryptographically sound padding modes in the application code. Encrypting user data directly with RSA is insecure.flenmust 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. The random number generator must be seeded prior to callingRSA_public_encrypt().RSA_private_decrypt() decrypts theflenbytes atfromusing the private keyrsaand stores the plaintext into. tomust point to a memory section large enough to hold the decrypted data (which is smaller than RSA_size(rsa)). paddingis the padding mode that was used to encrypt the data. MirOS BSD #10-current 2005-04-29 1 RSA_PUBLIC_ENCRYPT(3) OpenSSL RSA_PUBLIC_ENCRYPT(3)

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 byERR_get_error(3).

SSL, PKCS #1 v2.0

ERR_get_error(3),rand(3),rsa(3),RSA_size(3)

Thepaddingargument was added in SSLeay 0.8. RSA_NO_PADDING is available since SSLeay 0.9.0, OAEP was added in OpenSSL 0.9.2b. MirOS BSD #10-current 2005-04-29 2

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