Ivan Grokhotkov / hmac_md5

A simple CyaSSL-based HMAC-MD5 implementation. Licensed under GPL v2.

Dependents:   RFrec_full RFtrans_full

The output will be base64-encoded, with trailing "==", like this:

j62o/jZsAZD9i9m+32lIuQ==

Example

#include "mbed.h"
#include "hmac_md5.h"

Serial pc(USBTX, USBRX); // tx, rx

void main(void)
{
    
    const char * key = "MySecretKey";
    
    const char * text = "message to be signed";
    
    char output[26];
    
    HMAC_MD5(key, text, output);

    printf("result = %s\n", output);

    while(true){}
}

Diff: hmac_md5.cpp

Revision:
0:83f3dcfa5c8f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hmac_md5.cpp	Wed Feb 06 20:35:03 2013 +0000
@@ -0,0 +1,19 @@
+#include "hmac_md5.h"
+#include "hmac.h"
+#include "coding.h"
+
+void HMAC_MD5(const char * szKey, const char * szText, char * szOutput)
+{
+    Hmac hmac;
+    char hmacOutput[MD5_DIGEST_SIZE + 1];
+
+    HmacSetKey(&hmac, MD5, (const byte *) szKey, strlen(szKey));
+    HmacUpdate(&hmac, (const byte *) szText, strlen(szText));
+    
+    HmacFinal(&hmac, (byte *) hmacOutput);
+    
+    int encodedLength = 25;
+    Base64_Encode((const byte *) hmacOutput, MD5_DIGEST_SIZE, (byte *) szOutput, (word32*) &encodedLength);
+    szOutput[encodedLength] = 0;
+
+}