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RedHat 9 (Linux i386) - man page for rsa_private_encrypt (redhat section 3)

RSA_private_encrypt(3)						      OpenSSL						    RSA_private_encrypt(3)

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 mes- sage 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. 0.9.7a 2002-09-25 RSA_private_encrypt(3)

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