Developer Reference

Contents

mbx_rsa_private

Performs the private key RSA decryption operation.

Syntax

mbx_status mbx_rsa_private_mb8(const int8u* const
from_pa[8]
, int8u* const
to_pa[8]
, const int64u* const
d_pa[8]
, const int64u* const
n_pa[8]
, int
rsaBitlen
, const mbx_RSA_Method*
m
, int8u*
pBuffer
);
mbx_status mbx_rsa_private_ssl_mb8(const int8u* const
from_pa[8]
, int8u* const
to_pa[8]
, const BIGNUM* const
d_pa[8]
, const BIGNUM* const
n_pa[8]
, int
rsaBitlen
);
Include Files
crypto_mb/rsa.h
Parameters
from_pa
Array of pointers to the ciphertext data vectors.
to_pa
Array of pointers to the recovered data vectors.
d_pa
Array of pointers to the RSAs private exponent vectors.
n_pa
Array of pointers to the RSAs modulus vectors.
rsaBitLen
Size of RSAs moduli in bits.
m
Pointer to the pre-defined data structure specified by the RSA encryption operation.
pBuffer
Pointer to the work buffer.
Description
The
mbx_rsa_private()
function performs independent RSA private key operations using RSA private key in form of a pair - private exponent (
d
) and modulus (
n
). The exponents are passed through
d_pa
and moduli are passed though
n_pa
parameters. The size of RSAs moduli and private exponents must be the same and equal to
rsaBitlen
bits. The function decrypts ciphertexts specified by the
from_pa
parameter in parallel, and stores recovered ciphertexts in the memory locations specified by the
to_pa
parameter. Memory buffers of the plain- and ciphertext must be ceil(
rsaBitlen
/8) bytes length.
At the moment, RSA-10024, RSA-2048, RSA-3072 and RSA-4096 are supported only. If
m
is
NULL
, the function uses
mbx_RSA_private_Method
(
rsaBitsize
). If
m
is not
NULL
, it must be assigned to either
mbx_RSA1K_ private_Method()
,
mbx_RSA2K_ private_Method()
,
mbx_RSA3K_ private_Method()
or
mbx_RSA4K_ private_Method()
and match to
rsaBitlen
value.
If
pBuffer
is
NULL
, then the function allocated a work buffer of suitable size dynamically. An allocated buffer will be released before the function return. If the work buffer is allocated in the application, it affects performance positively. The
mbx_RSA_Method_BufSize
() function returns the size of the work buffer required for the operation.
The function itself does not support any kind of padding. The application is responsible for the padding if it is required.
The
mbx_rsa_private_ssl()
function is the "twin" of
mbx_rsa_private()
one. It acts the same. The basic difference in comparison with
mbx_rsa_private()
is the representation of RSA key stuff.
mbx_rsa_private_ssl
uses BIGNUM datatype instead of vector.
Return Values
The
mbx_rsa_private()
function returns the status that indicates whether the operation completed successfully or not. The status value of 0 indicates that all operations completed successfully. The error condition can be analyzed by the
MBX_GET_STS()
call.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.