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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/RSA_public_encrypt.pod | |
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Diffstat (limited to 'openssl/doc/crypto/RSA_public_encrypt.pod')
-rw-r--r-- | openssl/doc/crypto/RSA_public_encrypt.pod | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/openssl/doc/crypto/RSA_public_encrypt.pod b/openssl/doc/crypto/RSA_public_encrypt.pod new file mode 100644 index 000000000..ab0fe3b2c --- /dev/null +++ b/openssl/doc/crypto/RSA_public_encrypt.pod @@ -0,0 +1,84 @@ +=pod + +=head1 NAME + +RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography + +=head1 SYNOPSIS + + #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); + +=head1 DESCRIPTION + +RSA_public_encrypt() encrypts the B<flen> bytes at B<from> (usually a +session key) using the public key B<rsa> and stores the ciphertext in +B<to>. B<to> must point to RSA_size(B<rsa>) bytes of memory. + +B<padding> denotes one of the following modes: + +=over 4 + +=item RSA_PKCS1_PADDING + +PKCS #1 v1.5 padding. This currently is the most widely used mode. + +=item 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. + +=item RSA_SSLV23_PADDING + +PKCS #1 v1.5 padding with an SSL-specific modification that denotes +that the server is SSL3 capable. + +=item RSA_NO_PADDING + +Raw RSA encryption. This mode should I<only> be used to implement +cryptographically sound padding modes in the application code. +Encrypting user data directly with RSA is insecure. + +=back + +B<flen> must be less than RSA_size(B<rsa>) - 11 for the PKCS #1 v1.5 +based padding modes, less than RSA_size(B<rsa>) - 41 for +RSA_PKCS1_OAEP_PADDING and exactly RSA_size(B<rsa>) for RSA_NO_PADDING. +The random number generator must be seeded prior to calling +RSA_public_encrypt(). + +RSA_private_decrypt() decrypts the B<flen> bytes at B<from> using the +private key B<rsa> and stores the plaintext in B<to>. B<to> must point +to a memory section large enough to hold the decrypted data (which is +smaller than RSA_size(B<rsa>)). B<padding> is the padding mode that +was used to encrypt the data. + +=head1 RETURN VALUES + +RSA_public_encrypt() returns the size of the encrypted data (i.e., +RSA_size(B<rsa>)). RSA_private_decrypt() returns the size of the +recovered plaintext. + +On error, -1 is returned; the error codes can be +obtained by L<ERR_get_error(3)|ERR_get_error(3)>. + +=head1 CONFORMING TO + +SSL, PKCS #1 v2.0 + +=head1 SEE ALSO + +L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>, L<rsa(3)|rsa(3)>, +L<RSA_size(3)|RSA_size(3)> + +=head1 HISTORY + +The B<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. + +=cut |