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POIOS: Decrypting a message with public key received from webservice
 

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  1. POIOS: Decrypting a message with public key received from webservice
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    <p>I'm new to this topic so sorry if this is a stupid question :\</p> <p>I'm trying to decrypt a message with a given public key. Both the message and public key is given from the webservice. </p> <p>See the following code for how i currently do the decrypting:</p> <pre><code> for (NSValue *refVal in keyRefs) { SecKeyRef p_key = NULL; [refVal getValue:&amp;p_key]; if (p_key == NULL) continue; size_t dataLength = encryptedData.length; size_t outPutLength = MAX(dataLength, SecKeyGetBlockSize(p_key)); void *outPutBuf = malloc(outPutLength); if (outPutBuf) { // Error handling OSStatus status = SecKeyDecrypt(p_key, kSecPaddingNone, encryptedData.bytes, encryptedData.length, outPutBuf, &amp;outPutLength ); NSLog(@"decryption result code: %ld (size: %lu)", status, outPutLength); NSLog(@"FINAL decrypted text: %s", outPutBuf); if (status == errSecSuccess) { break; } } else { //Error handling } } </code></pre> <p>I get no errors, but the decrypted string is displayed like this (the correct output should be a JSON array): </p> <pre><code>decryption result code: 0 size:511) FINAL decrypted text: ˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ </code></pre> <p>Is it because I use the "SecKeyDecrypt" with a "public key" instead of a "private key"? In that case, what should i instead use for decrypting?</p> <p>Thanks for any help regarding this!</p> <p>EDIT: I'm using code from: <a href="http://blog.flirble.org/2011/01/05/rsa-public-key-openssl-ios/" rel="nofollow">http://blog.flirble.org/2011/01/05/rsa-public-key-openssl-ios/</a> to use the public key i get from the server (this is where "keyRefs" from the code snippet comes from)</p>
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    1. COA public key isn't for decryption. It's for encryption and signature verification. A private key is for decryption and signing.
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    2. COThe blog you linked doesn't use RSA for encryption at all. It uses a public key that's hardcoded into the client to verify a signature for licensing purposes. So what do you actually want to achieve?
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    3. COThe public key itself is the public part of a RSA-key-pair stored on the server. The encrypted message was created on the server by first JSON-encoding the object, then encrypted with the private-key with OPENSSL_PKCS1_PADDING, then base64-encoded, and then JSON-encoded again as a part of the final message. The message and public key is stored on the client. What i want is to decrypt the message on the client by using the public key. As i said, im not very good at this subject so i might have tried to do this the wrong way :\
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      1. USMadoc
 

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