Developer Reference

Contents

mbx_rsa_public

Performs the public key RSA encryption operation.

Syntax

mbx_status mbx_rsa_public_mb8(const int8u* const
from_pa[8]
,int8u* const
to_pa[8]
,const int64u* const
n_pa[8]
, int
rsaBitlen
, const mbx_RSA_Method*
m
, int8u*
pBuffer
);
mbx_status mbx_rsa_public_ssl_mb8(const int8u* const
from_pa[8]
,int8u* const
to_pa[8]
,const BIGNUM* const
e_pa[8]
, const BIGNUM* const
n_pa[8]
, int
rsaBitlen
);
Include Files
crypto_mb/rsa.h
Parameters
from_pa
Array of pointers to the plaintext data vectors.
to_pa
Array of pointers to the ciphertext data 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_public()
function performs independent RSA public key operations using RSA moduli passed though the
n_pa
parameter. The public exponent
e
is fixed and equals to 65537. The size of RSAs moduli must be the same and equal to
rsaBitlen
bits. The function encrypts plaintexts specified by the
from_pa
parameter in parallel, and stores 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_pub65537_Method
(
rsaBitsize
). If
m
is not
NULL
, it must be assigned to either
mbx_RSA1K_pub65537_Method()
,
mbx_RSA2K_pub65537_Method()
,
mbx_RSA3K_pub65537_Method()
or
mbx_RSA4K_pub65537_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_public_ssl()
function is the "twin" of
mbx_rsa_public()
one. It acts the same. The basic difference in comparison with
mbx_rsa_public()
is the representation of RSA key stuff.
mbx_rsa_public_ssl
uses BIGNUM datatype instead of vector.
Return Values
The
mbx_rsa_public()
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.