12-22-2013
The NSA paid $10 million to the security firm RSA to install a cryptographic backdoor.
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LEARN ABOUT CENTOS
rsa_private_encrypt
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
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.
1.0.1e 2013-02-11 RSA_private_encrypt(3)