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RSA_public_decrypt (3)
  • >> RSA_public_decrypt (3) ( Разные man: Библиотечные вызовы )
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    NAME

    RSA_private_encrypt, RSA_public_decrypt - low level signature operations
     
    

    SYNOPSIS

     #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);
    
    
     

    DESCRIPTION

    These functions handle RSA signatures at a low level.

    RSA_private_encrypt() signs the flen bytes at from (usually a message digest with an algorithm identifier) using the private key rsa and stores the signature in to. to must point to RSA_size(rsa) bytes of memory.

    padding denotes one of the following modes:

    RSA_PKCS1_PADDING
    PKCS #1 v1.5 padding. This function does not handle the algorithmIdentifier specified in PKCS #1. When generating or verifying PKCS #1 signatures, RSA_sign(3) and RSA_verify(3) should be used.
    RSA_NO_PADDING
    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 insecure.

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

    RETURN VALUES

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

    On error, -1 is returned; the error codes can be obtained by ERR_get_error(3).  

    SEE ALSO

    ERR_get_error(3), rsa(3), RSA_sign(3), RSA_verify(3)  

    HISTORY

    The padding argument was added in SSLeay 0.8. RSA_NO_PADDING is available since SSLeay 0.9.0.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    SEE ALSO
    HISTORY


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