Contents

RSA_GetSizePublicKey, RSA_GetSizePrivateKeyType1, RSA_GetSizePrivateKeyType2

Get the size of the IppsRSAPublicKeyState or IppsRSAPrivateKeyState context.

Syntax

IppStatus ippsRSA_GetSizePublicKey(int rsaModulusBitSize, int publicExpBitSize, int* pKeySize);

IppStatus ippsRSA_GetSizePrivateKeyType1(int rsaModulusBitSize, int privateExpBitSize, int* pKeySize);

IppStatus ippsRSA_GetSizePrivateKeyType2(int factorPBitSize, int factorQBitSize, int* pKeySize);

Include Files

ippcp.h

Parameters

rsaModulusBitSize

Length of the RSA system in bits (that is, the length of the composite RSA modulus n in bits).

publicExpBitSize

Length of the RSA public exponent in bits (that is, the length of the e component of the RSA public key).

privateExpBitSize

Length of the RSA private exponent in bits (that is, the length of the d component of the RSA private key type 1).

factorPBitSize, factorQBitSize

Length in bits of the p and q factors of the RSA modulus n = p*q.

pKeySize

Pointer to the IppsRSAPublicKeyState context size in bytes.

Description

These functions get the size of the IppsRSAPublicKeyState or IppsRSAPrivateKeyState context in bytes and stores it in *pKeySize. Call RSA_GetSizePublicKey to establish an RSA cryptosystem for encryption (or signature verification) operations. Call RSA_GetSizePrivateKeyType1 or RSA_GetSizePrivateKeyType2 to establish an RSA cryptosystem for decryption (or signature generation) operations. The choice between these two functions depends on the representation of the private key to be used.

Return Values

ippStsNoErr

Indicates no error. Any other value indicates an error or warning.

ippStsNullPtrErr

Indicates an error condition if any of the specified pointers is NULL.

ippStsNotSupportedModeErr

Indicates an error condition if rsaModulusBitSize < 32, rsaModulusBitSize > 4096, factorPBitSize + factorQBitSize < 32, factorPBitSize + factorQBitSize > 4096, factorPBitSize < 0, or factorQBitSize < 0.

ippStsBadArgErr

  • For RSA_GetSizePublicKey, indicates an error condition if publicExpBitSize < 0 or publicExpBitSize > rsaModulusBitSize.

  • For RSA_GetSizePrivateKeyType1, indicates and error condition if privateExpBitSize <0 or privateExpBitSize > rsaModulusBitSize.

  • For RSA_GetSizePrivateKeyType2, indicates and error condition if factorPBitSize <0, factorPBitSize < 0, or factorPBitSize < factorQBitSize.

previous

Functions for Building RSA System

next

RSA_InitPublicKey, RSA_InitPrivateKeyType1, RSA_InitPrivateKeyType2