1.54 CRYPT_SHA_Initialize Function

C

int CRYPT_SHA_Initialize(
    CRYPT_SHA_CTX* sha
);

Description

This function initializes the internal structures necessary for SHA hash calculations.

Preconditions

None.

Parameters

ParametersDescription
shaPointer to CRYPT_SHA_CTX structure which holds the hash values

Returns

  • BAD_FUNC_ARG - An invalid pointer was passed to the function
  • 0 - An invalid pointer was not passed to the function

Remarks

All SHA hashes have to start at a particular value before adding new data to it. This function sets the necessary values for the structure.

Example

CRYPT_SHA_CTX sha;
uint8_t shaSum[SHA_DIGEST_SIZE];

CRYPT_SHA_Initialize(&sha);
CRYPT_SHA_DataAdd(&sha, buffer, sizeof(buffer));
CRYPT_SHA_Finalize(&sha, shaSum);