RSA_PRIVATE_ENCRYPT - Online Linux Manual Page

Section : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMERSA_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);
DESCRIPTIONThese 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_sign (3), RSA_verify (3)
COPYRIGHTCopyright 2000−2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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