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am_defines.py
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#!/usr/bin/env python3
# Utility functioins
import sys
from Crypto.Cipher import AES
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
import array
import hashlib
import hmac
import os
import binascii
ivVal0 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
FLASH_PAGE_SIZE = 0x2000 # 8K
MAX_DOWNLOAD_SIZE = 0x48000 # 288K
AM_SECBOOT_DEFAULT_NONSECURE_MAIN = 0xC000
AM_SECBOOT_AESCBC_BLOCK_SIZE_WORDS = 4
AM_SECBOOT_AESCBC_BLOCK_SIZE_BYTES = 4*AM_SECBOOT_AESCBC_BLOCK_SIZE_WORDS
AM_SECBOOT_MIN_KEYIDX_INFO0 = 8 ## KeyIdx 8 - 15
AM_SECBOOT_MAX_KEYIDX_INFO0 = 15
AM_SECBOOT_MIN_KEYIDX_INFO1 = 0 ## KeyIdx 0 - 7
AM_SECBOOT_MAX_KEYIDX_INFO1 = 7
AM_SECBOOT_KEYIDX_BYTES = 16
# Encryption Algorithm
AM_SECBOOT_ENC_ALGO_NONE = 0
AM_SECBOOT_ENC_ALGO_AES128 = 1
AM_SECBOOT_ENC_ALGO_MAX = AM_SECBOOT_ENC_ALGO_AES128
# String constants
helpEncAlgo = 'Encryption Algo? (0(default) = none, 1 = AES128)'
# Authentication Algorithm
AM_SECBOOT_AUTH_ALGO_NONE = 0
AM_SECBOOT_AUTH_ALGO_SHA256HMAC = 1
AM_SECBOOT_AUTH_ALGO_MAX = AM_SECBOOT_AUTH_ALGO_SHA256HMAC
# String constants
helpAuthAlgo = 'Authentication Algo? (0(default) = none, 1 = SHA256)'
FLASH_INVALID = 0xFFFFFFFF
# KeyWrap Mode
AM_SECBOOT_KEYWRAP_NONE = 0
AM_SECBOOT_KEYWRAP_XOR = 1
AM_SECBOOT_KEYWRAP_AES128 = 2
AM_SECBOOT_KEYWRAP_MAX = AM_SECBOOT_KEYWRAP_AES128
#******************************************************************************
#
# Magic Numbers
#
#******************************************************************************
AM_IMAGE_MAGIC_MAIN = 0xC0
AM_IMAGE_MAGIC_CHILD = 0xCC
AM_IMAGE_MAGIC_NONSECURE = 0xCB
AM_IMAGE_MAGIC_INFO0 = 0xCF
# Dummy for creating images for customer - not understood by SBL
# This could be any value from the definition:
# #define AM_IMAGE_MAGIC_CUST(x) ((((x) & 0xF0) == 0xC0) && ((x) != 0xC0) && ((x) != 0xCC) && ((x) != 0xCB) && ((x) != 0xCF))
AM_IMAGE_MAGIC_CUSTPATCH = 0xC1
#******************************************************************************
#
# Image Types
#
#******************************************************************************
AM_SECBOOT_WIRED_IMAGETYPE_SBL = 0
AM_SECBOOT_WIRED_IMAGETYPE_AM3P = 1
AM_SECBOOT_WIRED_IMAGETYPE_PATCH = 2
AM_SECBOOT_WIRED_IMAGETYPE_MAIN = 3
AM_SECBOOT_WIRED_IMAGETYPE_CHILD = 4
AM_SECBOOT_WIRED_IMAGETYPE_CUSTPATCH = 5
AM_SECBOOT_WIRED_IMAGETYPE_NONSECURE = 6
AM_SECBOOT_WIRED_IMAGETYPE_INFO0 = 7
AM_SECBOOT_WIRED_IMAGETYPE_INFO0_NOOTA = 32
AM_SECBOOT_WIRED_IMAGETYPE_INVALID = 0xFF
#******************************************************************************
#
# Wired Message Types
#
#******************************************************************************
AM_SECBOOT_WIRED_MSGTYPE_HELLO = 0
AM_SECBOOT_WIRED_MSGTYPE_STATUS = 1
AM_SECBOOT_WIRED_MSGTYPE_OTADESC = 2
AM_SECBOOT_WIRED_MSGTYPE_UPDATE = 3
AM_SECBOOT_WIRED_MSGTYPE_ABORT = 4
AM_SECBOOT_WIRED_MSGTYPE_RECOVER = 5
AM_SECBOOT_WIRED_MSGTYPE_RESET = 6
AM_SECBOOT_WIRED_MSGTYPE_ACK = 7
AM_SECBOOT_WIRED_MSGTYPE_DATA = 8
#******************************************************************************
#
# Wired Message ACK Status
#
#******************************************************************************
AM_SECBOOT_WIRED_ACK_STATUS_SUCCESS = 0
AM_SECBOOT_WIRED_ACK_STATUS_FAILURE = 1
AM_SECBOOT_WIRED_ACK_STATUS_INVALID_INFO0 = 2
AM_SECBOOT_WIRED_ACK_STATUS_CRC = 3
AM_SECBOOT_WIRED_ACK_STATUS_SEC = 4
AM_SECBOOT_WIRED_ACK_STATUS_MSG_TOO_BIG = 5
AM_SECBOOT_WIRED_ACK_STATUS_UNKNOWN_MSGTYPE = 6
AM_SECBOOT_WIRED_ACK_STATUS_INVALID_ADDR = 7
AM_SECBOOT_WIRED_ACK_STATUS_INVALID_OPERATION = 8
AM_SECBOOT_WIRED_ACK_STATUS_INVALID_PARAM = 9
AM_SECBOOT_WIRED_ACK_STATUS_SEQ = 10
AM_SECBOOT_WIRED_ACK_STATUS_TOO_MUCH_DATA = 11
#******************************************************************************
#
# Definitions related to Image Headers
#
#******************************************************************************
AM_HMAC_SIG_SIZE = 32
AM_KEK_SIZE = 16
AM_CRC_SIZE = 4
AM_MAX_UART_MSG_SIZE = 8192 # 8K buffer in SBL
# Wiredupdate Image Header
AM_WU_IMAGEHDR_OFFSET_SIG = 16
AM_WU_IMAGEHDR_OFFSET_IV = 48
AM_WU_IMAGEHDR_OFFSET_KEK = 64
AM_WU_IMAGEHDR_OFFSET_IMAGETYPE = (AM_WU_IMAGEHDR_OFFSET_KEK + AM_KEK_SIZE)
AM_WU_IMAGEHDR_OFFSET_OPTIONS = (AM_WU_IMAGEHDR_OFFSET_IMAGETYPE + 1)
AM_WU_IMAGEHDR_OFFSET_KEY = (AM_WU_IMAGEHDR_OFFSET_IMAGETYPE + 4)
AM_WU_IMAGEHDR_OFFSET_ADDR = (AM_WU_IMAGEHDR_OFFSET_KEY + 4)
AM_WU_IMAGEHDR_OFFSET_SIZE = (AM_WU_IMAGEHDR_OFFSET_ADDR + 4)
AM_WU_IMAGEHDR_START_HMAC = (AM_WU_IMAGEHDR_OFFSET_SIG + AM_HMAC_SIG_SIZE)
AM_WU_IMAGEHDR_START_ENCRYPT = (AM_WU_IMAGEHDR_OFFSET_KEK + AM_KEK_SIZE)
AM_WU_IMAGEHDR_SIZE = (AM_WU_IMAGEHDR_OFFSET_KEK + AM_KEK_SIZE + 16)
# Image Header
AM_IMAGEHDR_SIZE_MAIN = 256
AM_IMAGEHDR_SIZE_AUX = (112 + AM_KEK_SIZE)
AM_IMAGEHDR_OFFSET_CRC = 4
AM_IMAGEHDR_OFFSET_SIG = 16
AM_IMAGEHDR_OFFSET_IV = 48
AM_IMAGEHDR_OFFSET_KEK = 64
AM_IMAGEHDR_OFFSET_SIGCLR = (AM_IMAGEHDR_OFFSET_KEK + AM_KEK_SIZE)
AM_IMAGEHDR_START_CRC = (AM_IMAGEHDR_OFFSET_CRC + AM_CRC_SIZE)
AM_IMAGEHDR_START_HMAC_INST = (AM_IMAGEHDR_OFFSET_SIG + AM_HMAC_SIG_SIZE)
AM_IMAGEHDR_START_ENCRYPT = (AM_IMAGEHDR_OFFSET_KEK + AM_KEK_SIZE)
AM_IMAGEHDR_START_HMAC = (AM_IMAGEHDR_OFFSET_SIGCLR + AM_HMAC_SIG_SIZE)
AM_IMAGEHDR_OFFSET_ADDR = AM_IMAGEHDR_START_HMAC
AM_IMAGEHDR_OFFSET_VERKEY = (AM_IMAGEHDR_OFFSET_ADDR + 4)
AM_IMAGEHDR_OFFSET_CHILDPTR = (AM_IMAGEHDR_OFFSET_VERKEY + 4)
# Recover message
AM_WU_RECOVERY_HDR_SIZE = 44
AM_WU_RECOVERY_HDR_OFFSET_CUSTID = 8
AM_WU_RECOVERY_HDR_OFFSET_RECKEY = (AM_WU_RECOVERY_HDR_OFFSET_CUSTID + 4)
AM_WU_RECOVERY_HDR_OFFSET_NONCE = (AM_WU_RECOVERY_HDR_OFFSET_RECKEY + 16)
AM_WU_RECOVERY_HDR_OFFSET_RECBLOB = (AM_WU_RECOVERY_HDR_OFFSET_NONCE + 16)
#******************************************************************************
#
# INFOSPACE related definitions
#
#******************************************************************************
AM_SECBOOT_INFO0_SIGN_PROGRAMMED0 = 0x48EAAD88
AM_SECBOOT_INFO0_SIGN_PROGRAMMED1 = 0xC9705737
AM_SECBOOT_INFO0_SIGN_PROGRAMMED2 = 0x0A6B8458
AM_SECBOOT_INFO0_SIGN_PROGRAMMED3 = 0xE41A9D74
AM_SECBOOT_INFO0_SIGN_UINIT0 = 0x5B75A5FA
AM_SECBOOT_INFO0_SIGN_UINIT1 = 0x7B9C8674
AM_SECBOOT_INFO0_SIGN_UINIT2 = 0x869A96FE
AM_SECBOOT_INFO0_SIGN_UINIT3 = 0xAEC90860
INFO_SIZE_BYTES = (8 * 1024)
INFO_MAX_AUTH_KEY_WORDS = 32
INFO_MAX_ENC_KEY_WORDS = 32
INFO_MAX_AUTH_KEYS = (INFO_MAX_AUTH_KEY_WORDS*4//AM_SECBOOT_KEYIDX_BYTES)
INFO_MAX_ENC_KEYS = (INFO_MAX_ENC_KEY_WORDS*4//AM_SECBOOT_KEYIDX_BYTES)
INFO0_SIGNATURE0_O = 0x00000000
INFO0_SIGNATURE1_O = 0x00000004
INFO0_SIGNATURE2_O = 0x00000008
INFO0_SIGNATURE3_O = 0x0000000c
INFO0_SECURITY_O = 0x00000010
INFO0_CUSTOMER_TRIM_O = 0x00000014
INFO0_CUSTOMER_TRIM2_O = 0x00000018
INFO0_SECURITY_OVR_O = 0x00000020
INFO0_SECURITY_WIRED_CFG_O = 0x00000024
INFO0_SECURITY_WIRED_IFC_CFG0_O = 0x00000028
INFO0_SECURITY_WIRED_IFC_CFG1_O = 0x0000002C
INFO0_SECURITY_WIRED_IFC_CFG2_O = 0x00000030
INFO0_SECURITY_WIRED_IFC_CFG3_O = 0x00000034
INFO0_SECURITY_WIRED_IFC_CFG4_O = 0x00000038
INFO0_SECURITY_WIRED_IFC_CFG5_O = 0x0000003C
INFO0_SECURITY_VERSION_O = 0x00000040
INFO0_SECURITY_SRAM_RESV_O = 0x00000050
AM_REG_INFO0_SECURITY_SRAM_RESV_SRAM_RESV_M = 0x0000FFFF
INFO0_WRITE_PROTECT_L_O = 0x000001f8
INFO0_WRITE_PROTECT_H_O = 0x000001fc
INFO0_COPY_PROTECT_L_O = 0x00000200
INFO0_COPY_PROTECT_H_O = 0x00000204
INFO0_WRITE_PROTECT_SBL_L_O = 0x000009f8
INFO0_WRITE_PROTECT_SBL_H_O = 0x000009fc
INFO0_COPY_PROTECT_SBL_L_O = 0x00000A00
INFO0_COPY_PROTECT_SBL_H_O = 0x00000A04
INFO0_MAIN_PTR1_O = 0x00000C00
INFO0_MAIN_PTR2_O = 0x00000C04
INFO0_KREVTRACK_O = 0x00000C08
INFO0_AREVTRACK_O = 0x00000C0C
INFO0_MAIN_CNT0_O = 0x00000FF8
INFO0_MAIN_CNT1_O = 0x00000FFC
INFO0_CUST_KEK_W0_O = 0x00001800
INFO0_CUST_KEK_W1_O = 0x00001804
INFO0_CUST_KEK_W2_O = 0x00001808
INFO0_CUST_KEK_W3_O = 0x0000180c
INFO0_CUST_KEK_W4_O = 0x00001810
INFO0_CUST_KEK_W5_O = 0x00001814
INFO0_CUST_KEK_W6_O = 0x00001818
INFO0_CUST_KEK_W7_O = 0x0000181c
INFO0_CUST_KEK_W8_O = 0x00001820
INFO0_CUST_KEK_W9_O = 0x00001824
INFO0_CUST_KEK_W10_O = 0x00001828
INFO0_CUST_KEK_W11_O = 0x0000182c
INFO0_CUST_KEK_W12_O = 0x00001830
INFO0_CUST_KEK_W13_O = 0x00001834
INFO0_CUST_KEK_W14_O = 0x00001838
INFO0_CUST_KEK_W15_O = 0x0000183c
INFO0_CUST_KEK_W16_O = 0x00001840
INFO0_CUST_KEK_W17_O = 0x00001844
INFO0_CUST_KEK_W18_O = 0x00001848
INFO0_CUST_KEK_W19_O = 0x0000184c
INFO0_CUST_KEK_W20_O = 0x00001850
INFO0_CUST_KEK_W21_O = 0x00001854
INFO0_CUST_KEK_W22_O = 0x00001858
INFO0_CUST_KEK_W23_O = 0x0000185c
INFO0_CUST_KEK_W24_O = 0x00001860
INFO0_CUST_KEK_W25_O = 0x00001864
INFO0_CUST_KEK_W26_O = 0x00001868
INFO0_CUST_KEK_W27_O = 0x0000186c
INFO0_CUST_KEK_W28_O = 0x00001870
INFO0_CUST_KEK_W29_O = 0x00001874
INFO0_CUST_KEK_W30_O = 0x00001878
INFO0_CUST_KEK_W31_O = 0x0000187c
INFO0_CUST_AUTH_W0_O = 0x00001880
INFO0_CUST_AUTH_W1_O = 0x00001884
INFO0_CUST_AUTH_W2_O = 0x00001888
INFO0_CUST_AUTH_W3_O = 0x0000188c
INFO0_CUST_AUTH_W4_O = 0x00001890
INFO0_CUST_AUTH_W5_O = 0x00001894
INFO0_CUST_AUTH_W6_O = 0x00001898
INFO0_CUST_AUTH_W7_O = 0x0000189c
INFO0_CUST_AUTH_W8_O = 0x000018a0
INFO0_CUST_AUTH_W9_O = 0x000018a4
INFO0_CUST_AUTH_W10_O = 0x000018a8
INFO0_CUST_AUTH_W11_O = 0x000018ac
INFO0_CUST_AUTH_W12_O = 0x000018b0
INFO0_CUST_AUTH_W13_O = 0x000018b4
INFO0_CUST_AUTH_W14_O = 0x000018b8
INFO0_CUST_AUTH_W15_O = 0x000018bc
INFO0_CUST_AUTH_W16_O = 0x000018c0
INFO0_CUST_AUTH_W17_O = 0x000018c4
INFO0_CUST_AUTH_W18_O = 0x000018c8
INFO0_CUST_AUTH_W19_O = 0x000018cc
INFO0_CUST_AUTH_W20_O = 0x000018d0
INFO0_CUST_AUTH_W21_O = 0x000018d4
INFO0_CUST_AUTH_W22_O = 0x000018d8
INFO0_CUST_AUTH_W23_O = 0x000018dc
INFO0_CUST_AUTH_W24_O = 0x000018e0
INFO0_CUST_AUTH_W25_O = 0x000018e4
INFO0_CUST_AUTH_W26_O = 0x000018e8
INFO0_CUST_AUTH_W27_O = 0x000018ec
INFO0_CUST_AUTH_W28_O = 0x000018f0
INFO0_CUST_AUTH_W29_O = 0x000018f4
INFO0_CUST_AUTH_W30_O = 0x000018f8
INFO0_CUST_AUTH_W31_O = 0x000018fc
INFO0_CUST_PUBKEY_W0_O = 0x00001900
INFO0_CUST_PUBKEY_W1_O = 0x00001904
INFO0_CUST_PUBKEY_W2_O = 0x00001908
INFO0_CUST_PUBKEY_W3_O = 0x0000190c
INFO0_CUST_PUBKEY_W4_O = 0x00001910
INFO0_CUST_PUBKEY_W5_O = 0x00001914
INFO0_CUST_PUBKEY_W6_O = 0x00001918
INFO0_CUST_PUBKEY_W7_O = 0x0000191c
INFO0_CUST_PUBKEY_W8_O = 0x00001920
INFO0_CUST_PUBKEY_W9_O = 0x00001924
INFO0_CUST_PUBKEY_W10_O = 0x00001928
INFO0_CUST_PUBKEY_W11_O = 0x0000192c
INFO0_CUST_PUBKEY_W12_O = 0x00001930
INFO0_CUST_PUBKEY_W13_O = 0x00001934
INFO0_CUST_PUBKEY_W14_O = 0x00001938
INFO0_CUST_PUBKEY_W15_O = 0x0000193c
INFO0_CUST_PUBKEY_W16_O = 0x00001940
INFO0_CUST_PUBKEY_W17_O = 0x00001944
INFO0_CUST_PUBKEY_W18_O = 0x00001948
INFO0_CUST_PUBKEY_W19_O = 0x0000194c
INFO0_CUST_PUBKEY_W20_O = 0x00001950
INFO0_CUST_PUBKEY_W21_O = 0x00001954
INFO0_CUST_PUBKEY_W22_O = 0x00001958
INFO0_CUST_PUBKEY_W23_O = 0x0000195c
INFO0_CUST_PUBKEY_W24_O = 0x00001960
INFO0_CUST_PUBKEY_W25_O = 0x00001964
INFO0_CUST_PUBKEY_W26_O = 0x00001968
INFO0_CUST_PUBKEY_W27_O = 0x0000196c
INFO0_CUST_PUBKEY_W28_O = 0x00001970
INFO0_CUST_PUBKEY_W29_O = 0x00001974
INFO0_CUST_PUBKEY_W30_O = 0x00001978
INFO0_CUST_PUBKEY_W31_O = 0x0000197c
INFO0_CUST_PUBKEY_W32_O = 0x00001980
INFO0_CUST_PUBKEY_W33_O = 0x00001984
INFO0_CUST_PUBKEY_W34_O = 0x00001988
INFO0_CUST_PUBKEY_W35_O = 0x0000198c
INFO0_CUST_PUBKEY_W36_O = 0x00001990
INFO0_CUST_PUBKEY_W37_O = 0x00001994
INFO0_CUST_PUBKEY_W38_O = 0x00001998
INFO0_CUST_PUBKEY_W39_O = 0x0000199c
INFO0_CUST_PUBKEY_W40_O = 0x000019a0
INFO0_CUST_PUBKEY_W41_O = 0x000019a4
INFO0_CUST_PUBKEY_W42_O = 0x000019a8
INFO0_CUST_PUBKEY_W43_O = 0x000019ac
INFO0_CUST_PUBKEY_W44_O = 0x000019b0
INFO0_CUST_PUBKEY_W45_O = 0x000019b4
INFO0_CUST_PUBKEY_W46_O = 0x000019b8
INFO0_CUST_PUBKEY_W47_O = 0x000019bc
INFO0_CUST_PUBKEY_W48_O = 0x000019c0
INFO0_CUST_PUBKEY_W49_O = 0x000019c4
INFO0_CUST_PUBKEY_W50_O = 0x000019c8
INFO0_CUST_PUBKEY_W51_O = 0x000019cc
INFO0_CUST_PUBKEY_W52_O = 0x000019d0
INFO0_CUST_PUBKEY_W53_O = 0x000019d4
INFO0_CUST_PUBKEY_W54_O = 0x000019d8
INFO0_CUST_PUBKEY_W55_O = 0x000019dc
INFO0_CUST_PUBKEY_W56_O = 0x000019e0
INFO0_CUST_PUBKEY_W57_O = 0x000019e4
INFO0_CUST_PUBKEY_W58_O = 0x000019e8
INFO0_CUST_PUBKEY_W59_O = 0x000019ec
INFO0_CUST_PUBKEY_W60_O = 0x000019f0
INFO0_CUST_PUBKEY_W61_O = 0x000019f4
INFO0_CUST_PUBKEY_W62_O = 0x000019f8
INFO0_CUST_PUBKEY_W63_O = 0x000019fc
INFO0_CUSTOMER_KEY0_O = 0x00001a00
INFO0_CUSTOMER_KEY1_O = 0x00001a04
INFO0_CUSTOMER_KEY2_O = 0x00001a08
INFO0_CUSTOMER_KEY3_O = 0x00001a0c
INFO0_CUST_PUBHASH_W0_O = 0x00001a10
INFO0_CUST_PUBHASH_W1_O = 0x00001a14
INFO0_CUST_PUBHASH_W2_O = 0x00001a18
INFO0_CUST_PUBHASH_W3_O = 0x00001a1c
#******************************************************************************
#
# CRC using ethernet poly, as used by Corvette hardware for validation
#
#******************************************************************************
def crc32(L):
return (binascii.crc32(L) & 0xFFFFFFFF)
#******************************************************************************
#
# Pad the text to the block_size. bZeroPad determines how to handle text which
# is already multiple of block_size
#
#******************************************************************************
def pad_to_block_size(text, block_size, bZeroPad):
text_length = len(text)
amount_to_pad = block_size - (text_length % block_size)
if (amount_to_pad == block_size):
if (bZeroPad == 0):
amount_to_pad = 0
for i in range(0, amount_to_pad, 1):
text += bytes(chr(amount_to_pad), 'ascii')
return text
#******************************************************************************
#
# AES CBC encryption
#
#******************************************************************************
def encrypt_app_aes(cleartext, encKey, iv):
key = array.array('B', encKey).tostring()
ivVal = array.array('B', iv).tostring()
plaintext = array.array('B', cleartext).tostring()
encryption_suite = AES.new(key, AES.MODE_CBC, ivVal)
cipher_text = encryption_suite.encrypt(plaintext)
return cipher_text
#******************************************************************************
#
# AES 128 CBC encryption
#
#******************************************************************************
def encrypt_app_aes128(cleartext, encKey, iv):
key = array.array('B', encKey).tostring()
ivVal = array.array('B', iv).tostring()
plaintext = array.array('B', cleartext).tostring()
encryption_suite = AES.new(key, AES.MODE_CBC, ivVal)
cipher_text = encryption_suite.encrypt(plaintext)
return cipher_text
#******************************************************************************
#
# SHA256 HMAC
#
#******************************************************************************
def compute_hmac(key, data):
sig = hmac.new(array.array('B', key).tostring(), array.array('B', data).tostring(), hashlib.sha256).digest()
return sig
#******************************************************************************
#
# RSA PKCS1_v1_5 sign
#
#******************************************************************************
def compute_rsa_sign(prvKeyFile, data):
key = open(prvKeyFile, "r").read()
rsakey = RSA.importKey(key)
signer = PKCS1_v1_5.new(rsakey)
digest = SHA256.new()
digest.update(bytes(data))
sign = signer.sign(digest)
return sign
#******************************************************************************
#
# RSA PKCS1_v1_5 sign verification
#
#******************************************************************************
def verify_rsa_sign(pubKeyFile, data, sign):
key = open(pubKeyFile, "r").read()
rsakey = RSA.importKey(key)
#print(hex(rsakey.n))
verifier = PKCS1_v1_5.new(rsakey)
digest = SHA256.new()
digest.update(bytes(data))
return verifier.verify(digest, sign)
#******************************************************************************
#
# Fill one word in bytearray
#
#******************************************************************************
def fill_word(barray, offset, w):
barray[offset + 0] = (w >> 0) & 0x000000ff;
barray[offset + 1] = (w >> 8) & 0x000000ff;
barray[offset + 2] = (w >> 16) & 0x000000ff;
barray[offset + 3] = (w >> 24) & 0x000000ff;
#******************************************************************************
#
# Turn a 32-bit number into a series of bytes for transmission.
#
# This command will split a 32-bit integer into an array of bytes, ordered
# LSB-first for transmission over the UART.
#
#******************************************************************************
def int_to_bytes(n):
A = [n & 0xFF,
(n >> 8) & 0xFF,
(n >> 16) & 0xFF,
(n >> 24) & 0xFF]
return A
#******************************************************************************
#
# Extract a word from a byte array
#
#******************************************************************************
def word_from_bytes(B, n):
return (B[n] + (B[n + 1] << 8) + (B[n + 2] << 16) + (B[n + 3] << 24))
#******************************************************************************
#
# automatically figure out the integer format (base 10 or 16)
#
#******************************************************************************
def auto_int(x):
return int(x, 0)
#******************************************************************************
#
# User controllable Prints control
#
#******************************************************************************
# Defined print levels
AM_PRINT_LEVEL_MIN = 0
AM_PRINT_LEVEL_NONE = AM_PRINT_LEVEL_MIN
AM_PRINT_LEVEL_ERROR = 1
AM_PRINT_LEVEL_INFO = 2
AM_PRINT_LEVEL_VERBOSE = 4
AM_PRINT_LEVEL_DEBUG = 5
AM_PRINT_LEVEL_MAX = AM_PRINT_LEVEL_DEBUG
# Global variable to control the prints
AM_PRINT_VERBOSITY = AM_PRINT_LEVEL_INFO
helpPrintLevel = 'Set Log Level (0: None), (1: Error), (2: INFO), (4: Verbose), (5: Debug) [Default = Info]'
def am_set_print_level(level):
global AM_PRINT_VERBOSITY
AM_PRINT_VERBOSITY = level
def am_print(*args, level=AM_PRINT_LEVEL_INFO, **kwargs):
global AM_PRINT_VERBOSITY
if (AM_PRINT_VERBOSITY >= level):
print(*args, **kwargs)