Parent topic:MPLAB® Harmony Crypto Library
int CRYPT_ECC_DSA_HashVerify(
CRYPT_ECC_CTX* ecc,
const unsigned char* sig,
unsigned int sigSz,
unsigned char* hash,
unsigned int hashSz,
int* status
);
This function verifies that an ECC signature is valid.
The ECC context must have been initialized with a call to CRYPT_ECC_Initialize. The key used for the signature must have been imported or created prior to calling this function.
| Parameters | Description |
|---|---|
| ecc | Pointer to context which saves state between calls. |
| sig | The signature to verify. |
| sigSz | The length of the signature (octets). |
| hash | The hash (message digest) that was signed. |
| hashSz | The length of the hash (octets). |
| status | Result of signature (1 == valid, 0 == invalid). |
BAD_FUNC_ARG - An invalid pointer was passed to the function.
MEMORY_E - Memory could not be allocated for the operation.
0 - An invalid pointer was not passed to the function.
None.
CRYPT_ECC_CTX userA;
int ret;
byte sig[100];
unsigned int sigSz = (unsigned int)sizeof(sig);
unsigned int usedA = 0;
int verifyStatus = 0;
ret = CRYPT_ECC_Initialize(&userA);
...
// Import or generate private key
...
ret = CRYPT_ECC_DSA_HashVerify(&userA, sig, sigSz, ourData, CRYPT_SHA_DIGEST_SIZE, &verifyStatus);