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POHow to use PKCS5_PBKDF2_HMAC_SHA1()
 

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  1. POHow to use PKCS5_PBKDF2_HMAC_SHA1()
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    <p>I am trying to use <code>PKCS5_PBKDF2_HMAC_SHA1()</code> and below is my sample program. I wanted to make sure if my result of <code>PKCS5_PBKDF2_HMAC_SHA1()</code> is correct so I verified the same with the website <a href="http://anandam.name/pbkdf2/" rel="nofollow noreferrer">http://anandam.name/pbkdf2/</a> and I see a different result. Am I using the API correctly? </p> <p>I am having doubts if I am passing salt value correctly.</p> <p>I have pasted my result and website result after the program.</p> <p>Please help me understand this.</p> <pre class="lang-c prettyprint-override"><code>#include &lt;stdio.h&gt; #include &lt;types.h&gt; #include &lt;string.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;malloc.h&gt; #include &lt;openssl/hmac.h&gt; #include &lt;openssl/evp.h&gt; #include &lt;openssl/engine.h&gt; #include &lt;openssl/aes.h&gt; #include &lt;openssl/rand.h&gt; #include &lt;proto.h&gt; #define KEY_LEN 32// 32 bytes - 256 bits #define KEK_KEY_LEN 5 #define ITERATION 1000 unsigned char salt_value[KEY_LEN]; unsigned char AESkey[KEY_LEN]; unsigned char XTSkey[KEY_LEN]; u8 fuse_key[KEY_LEN]; void main() { s32 i=0; s32 len =0; u8 *out; u8 *rspHMAC; const s8 pwd[] = "test"; s8 rspPKCS5[KEK_KEY_LEN * 2]; s32 ret; rspHMAC = (unsigned char *) malloc(sizeof(char) * KEY_LEN); out = (unsigned char *) malloc(sizeof(char) * KEK_KEY_LEN); RAND_bytes(salt_value, KEY_LEN); printf("\n salt_value[0] = %x; salt_value[31]= %x", salt_value[0], salt_value[31]); printf("\n strlen(salt_value) = %d; sizeof(salt_value) = %d\n", strlen(salt_value), sizeof(salt_value)); for(i = 0; i &lt; KEY_LEN; i++) { printf("%02x", salt_value[i]); } ret = PKCS5_PBKDF2_HMAC_SHA1(pwd, strlen(pwd), salt_value, strlen(salt_value), ITERATION, KEK_KEY_LEN, out); printf("\n PKCS#5 :"); for(len = 0; len &lt; KEK_KEY_LEN; len++){ printf("%02x", out[len]); sprintf(&amp;rspPKCS5[len * 2], "%02x", out[len]); } printf("\n"); } </code></pre> <p><strong>Sample Output:</strong></p> <pre><code>salt_value[0] = e2; salt_value[31]= 12 strlen(salt_value) = 32; sizeof(salt_value) = 32 e258017933f3e629a4166cece78f3162a3b0b7edb2e94c93d76fe6c38198ea12 PKCS#5 :7d7ec9f411 </code></pre> <p>Website result: </p> <pre><code>The derived 40-bit key is: a5caf6a0d3 </code></pre>
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