Manual Pages for UNIX Operating System command usage for man RSA_public_encrypt

OpenSSL                              RSA_public_encrypt(3openssl)



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     RSA_public_encrypt, RSA_private_decrypt - RSA public key
     cryptography

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      #include 

      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);


DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     RSA_public_encrypt() encrypts the fffflllleeeennnn bytes at ffffrrrroooommmm
     (usually a session key) using the public key rrrrssssaaaa and stores
     the ciphertext in ttttoooo. ttttoooo must point to RSA_size(rrrrssssaaaa) bytes
     of memory.

     ppppaaaaddddddddiiiinnnngggg denotes 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 should only be used to
         implement cryptographically sound padding modes in the
         application code.  Encrypting user data directly with
         RSA is insecure.

     fffflllleeeennnn must be less than RSA_size(rrrrssssaaaa) - 11 for the PKCS #1
     v1.5 based padding modes, less than RSA_size(rrrrssssaaaa) - 41 for
     RSA_PKCS1_OAEP_PADDING and exactly RSA_size(rrrrssssaaaa) for
     RSA_NO_PADDING.  The random number generator must be seeded
     prior to calling RSA_public_encrypt().

     RSA_private_decrypt() decrypts the fffflllleeeennnn bytes at ffffrrrroooommmm using
     the private key rrrrssssaaaa and stores the plaintext in ttttoooo. ttttoooo must
     point to a memory section large enough to hold the decrypted
     data (which is smaller than RSA_size(rrrrssssaaaa)). ppppaaaaddddddddiiiinnnngggg is the
     padding mode that was used to encrypt the data.



23/Mar/2004            Last change: 0.9.8o                      1






OpenSSL                              RSA_public_encrypt(3openssl)



RRRREEEETTTTUUUURRRRNNNN VVVVAAAALLLLUUUUEEEESSSS
     RSA_public_encrypt() returns the size of the encrypted data
     (i.e., RSA_size(rrrrssssaaaa)). 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).

CCCCOOOONNNNFFFFOOOORRRRMMMMIIIINNNNGGGG TTTTOOOO
     SSL, PKCS #1 v2.0

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

HHHHIIIISSSSTTTTOOOORRRRYYYY
     The ppppaaaaddddddddiiiinnnngggg 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.





































23/Mar/2004            Last change: 0.9.8o                      2