HashMessage¶
Computes the digest value of an input message.
Syntax¶
IppStatus ippsHashMessage(const Ipp8u *pMsg, int len, Ipp8u *pMD, IppHashAlgId hashAlg);
IppStatus ippsHashMessage_rmf(const Ipp8u *pMsg, int msgLen, Ipp8u *pHash, const ippsHashMethod *pMethod);
Include Files¶
ippcp.h
Parameters¶
pMsg |
Pointer to the input message. |
len, msgLen |
Message length in octets. |
pMD, pHash |
Pointer to the resultant digest. |
hashAlg |
Identifier of the hash algorithm. |
pMethod |
Pointer to the hash method. |
Description¶
The function uses the selected hash algorithm to compute the digest value of the entire (non-streaming) input message. The hashAlg and pMethod parameters define the hash algorithm used. The hashAlg parameter can take one of the values listed in table Supported Hash Algorithms. To get a value for the pMethod parameter, call one of the HashMethod functions.
Note
This function has a reduced memory footprint version. To learn more, see Reduced Memory Footprint Functions.
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. |
ippStsLengthErr |
Indicates an error condition if the length of the input data stream is less than zero. |
ippStsNotSupportedModeErr |
Indicates an error condition if the hashAlg parameter does not match any value of IppHashAlg listed in table Supported Hash Algorithms. |
Example¶
The code below computes MD5 digest of a message.
void MD5_sample(void)
{
// define message
Ipp8u msg[] = "abcdefghijklmnopqrstuvwxyz";
// once the whole message is placed into memory,
// you can use the integrated primitive
Ipp8u digest[16];
ippsHashMessage(msg, strlen((char*)msg), digest, IPP_ALG_HASH_MD5);
}