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POCrypto++ causing application failure
 

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  1. POCrypto++ causing application failure
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    <p>I am developing an AIR Native Extension of Crypto++ for Flash which I will release as public domain. I started with some code to test hashing (with SHA-256 in this case) but for some reason <code>CryptoPP::SHA256().CalculateDigest(abDigest, pbData, nDataLen);</code> (as discovered by the process of elimination) causes the Flash compiler to not recognize any available methods (The extension context does not have a method with the name isSupported.):</p> <p>Here's the full C++ code:</p> <pre><code>FREObject isSupported(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[]) { FREObject result; uint32_t isSupportedSwitch = 1; FRENewObjectFromBool(isSupportedSwitch, &amp;result); return result; } FREObject computeHash(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[]) { FREObject result; FREByteArray actualBytes; FREAcquireByteArray(argv[0], &amp;actualBytes); byte const* pbData = (byte*) actualBytes.bytes; unsigned int nDataLen = strlen((const char*) pbData); byte abDigest[CryptoPP::SHA256::DIGESTSIZE]; CryptoPP::SHA256().CalculateDigest(abDigest, pbData, nDataLen); memcpy(actualBytes.bytes, (uint8_t*) abDigest, 32); FREReleaseByteArray(argv[0]); FRENewObjectFromBool(1, &amp;result); return result; } void testContextInitializer(void* extData, const uint8_t* ctxType, FREContext ctx, uint32_t* numFunctions, const FRENamedFunction** functions) { *numFunctions = 2; FRENamedFunction* func = (FRENamedFunction*) malloc(sizeof(FRENamedFunction) * (*numFunctions)); func[0].name = (const uint8_t*) "isSupported"; func[0].functionData = NULL; func[0].function = &amp;isSupported; func[1].name = (const uint8_t*) "computeHash"; func[1].functionData = NULL; func[1].function = &amp;computeHash; *functions = func; } void testContextFinalizer(FREContext ctx) { return; } void testInitializer(void** extData, FREContextInitializer* ctxInitializer, FREContextFinalizer* ctxFinalizer) { *ctxInitializer = &amp;testContextInitializer; *ctxFinalizer = &amp;testContextFinalizer; } void testFinalizer(void* extData) { return; } </code></pre> <p>Any help on this would be deeply appreciated and would go a long way in helping me in this project.</p> <p>EDIT: To clarify, I am asking why <code>CryptoPP::SHA256().CalculateDigest(abDigest, pbData, nDataLen);</code> causes the application failure mentioned above and possible ways to fix it.</p>
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    1. USChris Smith
    1. USChris Smith
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    1. COIf you're writing this in Flash, why include the C++ code and not the Flash code? Why did you tag it "c++" instead of "flash"?
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      1. POCrypto++ causing application failure
      1. USDavid Thornley
    2. COIt is an AIR Native Extension. I quote: `Native extensions for Adobe AIR are a combination of ActionScript classes and native code that provide easy access to device-specific libraries and features that are not available in the built-in ActionScript classes.`. In this case I am attempting to write a Crypto++ ANE because the performance of C++ is much greater than ActionScript. What you see in the question is C++ code.
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      1. USChris Smith
 

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