issacapi/md/sample_md_basic.c

#include <stdio.h>
 
#include "issacapi_md.h"
 
static const unsigned char *plaintext = (const unsigned char *) "This is a test text";
static int plaintextSize = 19; // strlen("This is a test text");
 
static int sample_setup() {
    EErrorCode result = wasdk_init();
    if (result != EEC_Success) {
        printf("[ERROR] %s\n", wasdk_error_message(result));
        return 1;
    }
    return 0;
}
 
 
int sample_md_basic() {
    ISSAC_RETURN result;
    MDCONTEXT context;
    unsigned char md[MAX_HASH_SIZE] = { 0, };
    int mdLen = 0;
 
    printf("sample_md_basic() => ");
 
    ISSAC_MDCONTEXT_Create(&context);
 
    // 해시 알고리즘 설정
    result = ISSAC_MD_Initialize(&context, ISSACAPI_SHA256);
    // 원문 메시지 추가
    if (result == ISSAC_SUCCESS) {
        result = ISSAC_MD_Update(&context, plaintext, plaintextSize);
    }
    // 해시 출력값 가져오기
    if (result == ISSAC_SUCCESS) {
        result = ISSAC_MD_Finalize(md, &mdLen, sizeof(md), &context);
    }
 
    ISSAC_MDCONTEXT_Delete(&context);
 
    if (result == ISSAC_SUCCESS) {
        printf("[OK]\n");
        return 0;
    } else {
        printf("[ERROR] %s\n", ISSAC_GetErrorMessage(result));
        return 1;
    }
}
 
int main() {
    int result;
 
    result = sample_setup();
    if (result != 0) {
        return result;
    }
 
    return sample_md_basic();
}