SHA1 HMAC a byte array with Arduino - arduino

Question

How can I HMAC a byte array on an Arduino? I've found this library for SHA1 HMACs, but it appears to be used only for strings.
I've passed it bytes in a null-terminated byte array. This does give me the correct result. But doesn't work so well for byte arrays that contain zeros!
uint8_t hmacKey1[]={ 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x21, 0xde, 0xad, 0xbe, 0xef };
uint8_t time[]={ 0xb2, 0x00 };
Sha1.initHmac(hmacKey1, 10);
Sha1.print((char*)time);
Either I need to find another another library (crypto-arduino-library looks promising, but doesn't include any examples for what I'm doing), or hack up the Cathedrow library to do what I'm after.
Does anyone know of another way?

Answer 1

Adding my own method appears to have done the trick:
void Sha1Class::writebytes(const uint8_t* data, int length) {
for (int i=0; i<length; i++)
{
write(data[i]);
}
}

Answer 2

If you don't want to change sha1.cpp you can just loop and print each single byte, the trick is to use Sha1.print((char) basestring[i]);, like so:
#include <avr/pgmspace.h>
#include <sha1.h>
char key[] = "testKey";
uint8_t basestring[] = { 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67 }; // testing
void printHash(uint8_t* hash) {
for (int i=0; i<20; i++) {
Serial.print("0123456789abcdef"[hash[i]>>4]);
Serial.print("0123456789abcdef"[hash[i]&0xf]);
}
Serial.println();
}
void setup() {
Serial.begin(115200);
Serial.print("Input: ");
for (int i=0; i<sizeof(basestring); i++) {
Serial.print((char) basestring[i]);
}
Serial.println();
Serial.print("Key: ");
Serial.println(key);
Serial.print("Hmac-sha1 (hex): ");
Sha1.initHmac((uint8_t*)key, strlen(key));
for (int i=0; i<sizeof(basestring); i++) {
Sha1.print((char) basestring[i]);
}
uint8_t *hash;
hash = Sha1.resultHmac();
printHash(hash);
}
void loop() { }
Output
Input: testing
Key: testKey
Hmac-sha1 (hex): 60d41271d43b875b791e2d54c34bf3f018a29763