[OpenSSL] Hash Value 함수

아래는 해쉬 값을 가져오는 소스이다

pAlg 에 사용되는 값은 md5, sha1, sha224, sha256, sm3 등 문자열 이다.
pSrc 가 입력 값
pHash 가 결과 해쉬 값

BIN 구조체

typedef struct _BIN {
	int				nLen;
	unsigned char	*pVal;
} BIN;

int JS_PKI_genHash(const char * pAlg, const BIN * pSrc, BIN * pHash)
{
	int				nRet = 0;
	EVP_MD_CTX		*pCTX = NULL;
	const EVP_MD	*pMD = NULL;
	unsigned char	*pDigest = NULL;
	int				nDigestLen = 0;

	pMD = EVP_get_digestbyname(pAlg);
	if (pMD == NULL)
	{
		fprintf(stderr, "invalid digest algorithm(%s)\n", pAlg);
		return -1;
	}

	pCTX = EVP_MD_CTX_create();
	if (pCTX == NULL)
	{
		fprintf(stderr, "fail to create ctx\n");
		return -2;
	}

	nRet = EVP_DigestInit(pCTX, pMD);
	if (nRet != 1)
	{
		fprintf(stderr, "digest init fail(%d)\n", nRet);
		nRet = -3;
		goto end;
	}

	nRet = EVP_DigestUpdate(pCTX, pSrc->pVal, pSrc->nLen);
	if (nRet != 1)
	{
		fprintf(stderr, "digest update fail(%d)\n", nRet);
		nRet = -4;
		goto end;
	}

	pDigest = (unsigned char *)JS_calloc(1, EVP_MD_size(pMD));
	if (pDigest == NULL)
	{
		fprintf(stderr, "out of memeory for digest\n");
		nRet = -5;
		goto end;
	}

	nRet = EVP_DigestFinal(pCTX, pDigest, (unsigned int *)&nDigestLen);
	if (nRet != 1)
	{
		fprintf(stderr, "digest final fail(%d)\n", nRet);
		nRet = -6;
		goto end;
	}

	if (nDigestLen > 0)
	{
		JS_BIN_set(pHash, pDigest, nDigestLen);
		nRet = 0;
	}

end :
	if (pCTX)
	{
		EVP_MD_CTX_destroy(pCTX);
	}

	if (pDigest) JS_free(pDigest);

	return nRet;
}

아래는 BerEditor 에서 해쉬 위 함수를 돌린 화면이다