RSA_public_decrypt man page on DigitalUNIX

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RSA_private_encrypt(3)					RSA_private_encrypt(3)

       RSA_private_encrypt,  RSA_public_decrypt	 -  Low level signature opera‐

       #include <openssl/rsa.h>

       int RSA_private_encrypt(
	       int flen, unsigned char *from, unsigned char *to, RSA *rsa, int
       padding ); int RSA_public_decrypt(
	       int flen, unsigned char *from, unsigned char *to, RSA *rsa, int
       padding );

       These functions handle RSA signatures at a low level.

       The RSA_private_encrypt() function signs the flen bytes at  from	 (usu‐
       ally  a	message digest with an algorithm identifier) using the private
       key rsa	and  stores  the  signature  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 function does not handle the algorithmIdentifier specified in PKCS
       #1. When generating or verifying PKCS #1 signatures, the RSA_sign() and
       RSA_verify() functions should be used.  Raw RSA	signature.  This  mode
       should  only be used to implement cryptographically sound padding modes
       in the application code. Signing user data directly with RSA  is	 inse‐

       The  RSA_public_decrypt() function recovers the message digest from the
       flen bytes long signature at from using the signer's  public  key  rsa.
       The  to must point to a memory section large enough to hold the message
       digest (which is smaller than RSA_size(rsa) - 11). The padding  is  the
       padding mode that was used to sign the data.

       The  RSA_private_encrypt()  function  returns the size of the signature
       (i.e., RSA_size(rsa)). The RSA_public_decrypt()	function  returns  the
       size of the recovered message digest.

       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	avail‐
       able since SSLeay 0.9.0.

       Functions: err(3), rsa(3), RSA_sign(3), RSA_verify(3)


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