> ## Documentation Index
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> Use this file to discover all available pages before exploring further.

# CAPLfunctionSecurityLocalVerifyEcdsa

# SecurityLocalVerifyEcdsa

[Valid for](../../../Shared/FeatureAvailability.md):  CANoe DE • CANoe4SW DE

## Function Syntax

`SecurityLocalVerifyEcdsa(dword curve, dword hashAlgorithm, dword signatureFormat, byte publicKey[], dword publicKeyLength, byte data[], dword dataLength, byte signature[], dword signatureLength, dword* verificationResult)`

## Description

Verifies the signature of the data with a given public key using the ECDSA signature algorithm. The curve, hash algorithm and the signature format can be selected via the parameters.

## Parameters

* **dword curve**\
  ID of the curve to use.\
  Available curves:
  * brainpool256r1 = 1
  * brainpool384r1 = 2
  * brainpool512r1 = 3
  * secp256r1 = 4
  * secp384r1 = 5
  * secp521r1 = 6

* **dword hashAlgorithm**\
  ID of the hash algorithm to use.\
  Available hash algorithm:
  * SHA-256 = 1
  * SHA-384 = 2
  * SHA-512 = 3

* **dword signatureFormat**\
  ID of the signature format to use.\
  Available signature formats:
  * IEEE1363 = 0
  * DER sequence = 1

* **byte publicKey\[]**\
  Public key to be used for verification\
  The following formats are accepted:
  * raw key bytes
  * DER
  * PEM

* **dword publicKeyLength**\
  Length of public key to be used for verification.

* **byte data\[]**\
  Data to be verified.

* **dword dataLength**\
  Length of data to be verified.

* **byte signature\[]**\
  Signature to be verified.

* **dword signatureLength**\
  Length of signature to be verified.

* **dword verificationResult \[OUT]**\
  Result of signature verification.

## Return Values

* **1**\
  Success\
  A Value of 1 means that the action was successful.

* **≤ 0**\
  Error\
  A value less than or equal to 0 means error.

## Example

Note

```plaintext theme={null}
dword curve = 1; // brainpool256r1
dword hashAlgorithm = 1; // SHA-256
dword signatureFormat = 1; // DER sequence
byte privateKey[138] = {0x30,0x81,0x87,0x02,0x01,0x00,0x30,0x13,0x06,0x07,0x2a,0x86,0x48,0xce,0x3d,0x02,0x01,0x06,0x08,0x2a,0x86,0x48,0xce,0x3d,0x03,0x01,0x07,0x04,0x6d,0x30,0x6b,0x02,0x01,0x01,0x04,0x20,0x86,0xd6,0x1d,0x9e,0x43,0xfa,0x81,0xf9,0x46,0xad,0xac,0xf2,0x1b,0x14,0x60,0xb9,0xc8,0xb4,0xe6,0x5e,0x99,0x77,0xc7,0x13,0x9d,0x20,0x6c,0x46,0xb3,0x09,0xc8,0xb3,a1,0x44,0x03,0x42,0x00,0x04,0xd5,0xc1,0x3a,0xba,0xff,0x54,0x6b,0x36,0xd6,0x61,0x14,0x18,0x42,0x6e,0x55,0xb1,0x8d,0x34,0x71,0xfb,0x58,0xc5,0x36,0x04,0x11,0x91,0xed,0xa7,0x5b,0x45,0xd1,0xfb,0x1d,0xd6,0xa0,0x42,0xae,0x91,0x6b,0x70,0x6d,0x8f,0x9e,0x13,0x7b,0x6e,0xdf,0x5b,0x42,0x3c,0x13,0x02,0x06,0x13,0xb7,0x62,0x0a,0xf6,0x8b,0x7f,0xc8,0x45,0x9f,0x33};
dword privateKeySize = elcount(privateKey);
byte publicKey[91] = {0x30,0x59,0x30,0x13,0x06,0x07,0x2a,0x86,0x48,0xce,0x3d,0x02,0x01,0x06,0x08,0x2a,0x86,0x48,0xce,0x3d,0x03,0x01,0x07,0x03,0x42,0x00,0x04,0xd5,0xc1,0x3a,0xba,0xff,0x54,0x6b,0x36,0xd6,0x61,0x14,0x18,0x42,0x6e,0x55,0xb1,0x8d,0x34,0x71,0xfb,0x58,0xc5,0x36,0x04,0x11,0x91,0xed,0xa7,0x5b,0x45,0xd1,0xfb,0x1d,0xd6,0xa0,0x42,0xae,0x91,0x6b,0x70,0x6d,0x8f,0x9e,0x13,0x7b,0x6e,0xdf,0x5b,0x42,0x3c,0x13,0x02,0x06,0x13,0xb7,0x62,0x0a,0xf6,0x8b,0x7f,0xc8,0x45,0x9f,0x33};
dword publicKeySize = elcount(publicKey);
byte data[3] = {0x11, 0x11, 0x11};
dword dataSize = elcount(data);
byte signature[1000];
dword signatureSize = elcount(signature);
dword verificationResult = 0;
long resultSigning;
long resultVerification;
resultSigning = SecurityLocalSignEcdsa(curve, hashAlgorithm, signatureFormat, privateKey, privateKeySize, data, dataSize, signature, signatureSize);
resultVerification = SecurityLocalVerifyEcdsa(curve, hashAlgorithm, signatureFormat, publicKey, publicKeySize, data, dataSize, signature, signatureSize, verificationResult);
```

[SecurityLocalVerifyEd25519](CAPLfunctionSecurityLocalVerifyEd25519.md)