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POPrint unsigned int (base 10 / decimal) value of MPI
 

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  1. POPrint unsigned int (base 10 / decimal) value of MPI
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    <p>I'm trying to confirm/get the unsigned int (base 10 / decimal) value of an hex'd mpi value. I'm using the following code:</p> <pre><code>#include &lt;gcrypt.h&gt; #include &lt;stdio.h&gt; static gcry_mpi_t privkey = NULL; int main(){ char *parmstr = "48BFDA215C31A9F0B226B3DB11F862450A0F30DA"; printf("starting program\n"); gcry_mpi_scan(&amp;privkey, GCRYMPI_FMT_HEX, (char *)parmstr, 0, NULL); printf("printing hashed (?) mpi\n"); gcry_mpi_dump(privkey); printf("\n"); size_t gablen; unsigned char *result; /* get length */ gcry_mpi_print (GCRYMPI_FMT_USG, NULL, 0, &amp;gablen, privkey); result = gcry_malloc_secure(gablen); /* get actual value */ gcry_mpi_print (GCRYMPI_FMT_USG, result, gablen, NULL, privkey); /* print actual value */ printf("result: %s\n", result); printf("finished\n"); } </code></pre> <p>and i'm getting the following result:</p> <pre><code> $ ./foo starting program printing hashed (?) mpi 48BFDA215C31A9F0B226B3DB11F862450A0F30DA result: H¿Ú!\1©ð²&amp;³ÛøbE 0Ú finished </code></pre> <p>I would the 'result: ' line to print the actual unsigned int (base 10 / decimal) value.</p> <p>The private key is taking from the Off-The-Record Pidgin plug-in that i'm trying to work with.</p> <p><em>EDIT</em>:</p> <p>can anybody confirm that the actual unsigned int (base 10 / decimal) value should be</p> <blockquote> <p>415325779662433871844955547383752003988573073626</p> </blockquote> <p>I could probably update the program to create a new mpi in gcrypt with this value and see if the HEX value is the same as what i already have. I will do this later today.</p> <p><em>EDIT 2</em>:</p> <p>So i'm trying to do the following to print the HEX value of the int value mentioned above. Something is going wrong:</p> <pre><code>gcry_mpi_t cript_prime; char buffer[50] = {0}; char number[50] = {0}; cript_prime = gcry_mpi_new(50); strcpy(number,"415325779662433871844955547383752003988573073626"); gcry_mpi_scan(&amp;cript_prime,GCRYMPI_FMT_USG,number,sizeof(number),NULL); gcry_mpi_print(GCRYMPI_FMT_USG,buffer,sizeof(buffer),NULL,cript_prime); printf("The number tested is: %s\n",buffer); printf("trying to convert to HEX\n"); /* get actual value */ gcry_mpi_print (GCRYMPI_FMT_HEX, buffer, sizeof(buffer), NULL, cript_prime); /* print actual value */ printf("result: %s\n", buffer); </code></pre> <p>The output is:</p> <pre><code>result: 48BFDA215C31A9F0B226B3DB11F862450A0F30DA The number tested is: 415325779662433871844955547383752003988573073626 trying to convert to HEX result: 415325779662433871844955547383752003988573073626 </code></pre> <p><em>EDIT 3</em>:</p> <p>I updated the post a bit, basically i'm trying to print the base10 decimal value of an hex value that is generated by the gcrypt library. I'm looking for this value to confirm an implementation that i made to read these values. I was looking for a gcrypt function to achieve this. It seems that gcrypt doesn't supports this?</p>
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    1. COSo... you're writing a crypto lib and got stuck on converting a hex value into a decimal value?
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    2. COI updated the post, basically i'm trying to get the base 10 / decimal value of the hex'd value that is generated by the gcrypt library.
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