Developer Reference for Intel® Integrated Performance Primitives Cryptography
Get the size of the IppsRSAPublicKeyState or IppsRSAPrivateKeyState context.
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);
ippcp.h
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. |
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.
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. |