HMAC-SHA1 in JAVA and OpenSSL

// HMAC-SHA1 in JAVA
public static String getSHA1Digest(String PlainText, String key)
	{
		String sha_string = null;
		try
		{
			SecretKey secretKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
			Mac messageAuthenticationCode = Mac.getInstance("HmacSHA1");
			messageAuthenticationCode.init(secretKey);
			messageAuthenticationCode.update(PlainText.getBytes());
			byte[] digest = messageAuthenticationCode.doFinal();
			sha_string = new String(HexBin.encode(digest));
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		finally
		{
			return sha_string;
		}
	}
 
 
// HMAC-SHA1 in OpenSSL
void computeHmac(char* hmac, const char* input, int length, const char* key, int sizeKey)
{
   unsigned int resultSize=0;
   HMAC(EVP_sha1(),
        key, sizeKey,
        (const unsigned char*)(input), length,
        (unsigned char*)(hmac), &resultSize);
   assert(resultSize == 20);
}