密钥库huks生成的sm2密钥场景下，获取签名所需userid值的方法。

openssl dgst -sm3 plain.bin

void verifySignature(void) 
{ 
  uint8_t pubkey[] = { 
  0x30, 0x5A, 0x30, 0x14, 0x06, 0x08, 0x2A, 0x81, 0x1C, 0xCF, 0x55, 0x01, 0x82, 0x2D, 0x06, 0x08, 
  0x2A, 0x81, 0x1C, 0xCF, 0x55, 0x01, 0x82, 0x2D, 0x03, 0x42, 0x00, 0x04, 0x77, 0x58, 0x36, 0x91, 
  0x2E, 0x19, 0x5E, 0x0A, 0xD0, 0x5A, 0xA1, 0x17, 0x51, 0x5E, 0x1F, 0x18, 0xB9, 0xF8, 0xB3, 0xCB, 
  0xD3, 0xAE, 0xE6, 0x73, 0x9D, 0x6B, 0xAC, 0xE9, 0x08, 0xAB, 0x47, 0x2C, 0xDF, 0x2C, 0x6F, 0x3D, 
  0x85, 0x04, 0x12, 0x13, 0xB0, 0x9F, 0x2D, 0x03, 0xCE, 0xEE, 0x86, 0xBB, 0x12, 0xEB, 0x7F, 0x08, 
  0x48, 0x96, 0xB1, 0xDC, 0xF8, 0xD0, 0xD8, 0xDC, 0xAA, 0x42, 0x9B, 0x20, 
}; 
 
  uint8_t *pubkeyPointer = pubkey; 
  EVP_PKEY *evpPkey = d2i_PUBKEY(NULL, &pubkeyPointer, sizeof(pubkey)); 
  LOGI("evpPkey %p sz %d", evpPkey, pubkeyPointer - pubkey); 
 
  EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(evpPkey, NULL); 
  EVP_PKEY_verify_init(ctx); 
  EVP_PKEY_CTX_set_signature_md(ctx, EVP_sm3()); 
 
  uint8_t sig[] = { 
  0x30, 0x46, 
  0x02, 0x21, 0x00, 
  0x9E, 0x2C, 0xA7, 0xF2, 0x4E, 0x80, 0x54, 0x9D, 0xE7, 0x9D, 0x1B, 0x97, 0x38, 0x0E, 0x88, 0xEA, 
  0x09, 0xE1, 0x46, 0x50, 0x27, 0x88, 0xD5, 0x1C, 0xB9, 0xCC, 0xED, 0x7D, 0x43, 0x32, 0x50, 0x3C, 
  0x02, 0x21, 0x00, 
  0x81, 0x15, 0x61, 0xD7, 0x9A, 0xEE, 0x20, 0x3C, 0x4D, 0x92, 0x41, 0xBF, 0xD5, 0x8B, 0x38, 0x7C, 
  0x24, 0x91, 0x3A, 0x11, 0x18, 0x15, 0x58, 0xCD, 0xC1, 0x99, 0x18, 0x28, 0xBF, 0x8A, 0x0B, 0x73, 
}; 
  uint8_t plainDigest[] = { 
  0x15, 0x9C, 0xA3, 0xD6, 0x6A, 0x79, 0x7D, 0xD5, 0xF5, 0x90, 0x5A, 0x9F, 0x87, 0x19, 0xBD, 0x41, 
  0x21, 0xE7, 0x26, 0xEA, 0xB8, 0x83, 0x7F, 0x29, 0x64, 0x09, 0x3C, 0xA5, 0x19, 0xB3, 0x9F, 0x54, 
}; 
 
  int ret = EVP_PKEY_verify(ctx, sig, sizeof(sig), plainDigest, sizeof(plainDigest)); 
  LOGI("ret = 0x%x", ret); 
}