Cryptography for Intel(R) Integrated Performance Primitives Developer Reference

ID 768738
Date 12/16/2022
Document Table of Contents


Performs the public key RSA encryption operation.


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




Array of pointers to the plaintext data vectors.


Array of pointers to the ciphertext data vectors.


Array of pointers to the RSAs modulus vectors.


Size of RSAs moduli in bits.


Pointer to the pre-defined data structure specified by the RSA encryption operation.


Pointer to the work buffer.

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.

See Also

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