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Example of how to encrypt in Python w/ pycrypt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,33 +1,61 @@ | ||
| #!/usr/bin/python | ||
| from Crypto.Cipher import AES | ||
| from Crypto import Random | ||
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| import Crypto.Hash.SHA | ||
| import Crypto.Hash.SHA256 | ||
| import Crypto.Random | ||
| import Crypto.Protocol.KDF | ||
| import Crypto.Cipher.AES | ||
| import Crypto.Hash.HMAC | ||
| import StringIO | ||
| from pkcs7 import PKCS7Encoder | ||
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| class RNCryptor: | ||
| """Cryptor for RNCryptor""" | ||
| def __init__(self, settings): | ||
| self.settings = settings | ||
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| def encrypt(self, message, key, hmac_key): | ||
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| salt_size = 8 | ||
| key_length = 32 | ||
| iterations = 10000 | ||
| HMAC_hash_algo = Crypto.Hash.SHA256 | ||
| block_size = Crypto.Cipher.AES.block_size | ||
| mode = Crypto.Cipher.AES.MODE_CBC | ||
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| def encrypt(self, message, password): | ||
| random = Crypto.Random.new() | ||
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| encryption_salt = random.read(self.salt_size) | ||
| encryption_key = Crypto.Protocol.KDF.PBKDF2(password, encryption_salt, self.key_length, self.iterations) | ||
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| hmac_salt = random.read(self.salt_size) | ||
| hmac_key = Crypto.Protocol.KDF.PBKDF2(password, hmac_salt, self.key_length, self.iterations) | ||
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| iv = random.read(self.block_size) | ||
| cipher = Crypto.Cipher.AES.new(encryption_key, self.mode, iv) | ||
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| ciphertext = cipher.encrypt(self.pad(message)) | ||
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| output = StringIO.StringIO() | ||
| output.write(1) # Version 1 | ||
| output.write(0) # No options | ||
| iv = Random.new().read(AES.block_size) | ||
| cipher = AES.new(key, AES.MODE_CBC, iv) | ||
| encoder = PKCS7Encoder() | ||
| output.write(chr(2)) # Version 2 | ||
| output.write(chr(1)) # Password | ||
| output.write(encryption_salt) | ||
| output.write(hmac_salt) | ||
| output.write(iv) | ||
| output.write(cipher.encrypt(encoder.encode(message))) | ||
| output.write(ciphertext) | ||
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| hmac = Crypto.Hash.HMAC.new(hmac_key, output.getvalue(), self.HMAC_hash_algo) | ||
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| output.write(hmac.digest()) | ||
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| return output.getvalue() | ||
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| def pad(self, data): | ||
| block_size = self.block_size | ||
| return data + (block_size - len(data) % block_size) * chr(block_size - len(data) % block_size) | ||
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| def main(): | ||
| plaintext = b"Attack at dawn" | ||
| key = '000102030405060708090a0b0c0d0e0f'.decode("hex") | ||
| hmac_key = '0f0e0d0c0b0a09080706050403020100'.decode("hex") | ||
| cipher = RNCryptor("") | ||
| ciphertext = cipher.encrypt(plaintext, key, hmac_key) | ||
| print ''.join('%02x' % ord(byte) for byte in ciphertext) | ||
| password = b"mypassword" | ||
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| message = RNCryptor().encrypt(plaintext, password) | ||
| print ''.join('%02x' % ord(byte) for byte in message) | ||
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| if __name__ == '__main__': | ||
| main() |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // | ||
| // main.m | ||
| // rncrypt | ||
| // | ||
| // Created by Rob Napier on 3/17/13. | ||
| // Copyright (c) 2013 Rob Napier. All rights reserved. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
| #import "RNEncryptor.h" | ||
| #import "RNDecryptor.h" | ||
| #import <getopt.h> | ||
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| NSData *GetDataForHex(NSString *hex) | ||
| { | ||
| NSString *hexNoSpaces = [hex stringByReplacingOccurrencesOfString:@" " withString:@""]; | ||
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| NSMutableData *data = [[NSMutableData alloc] init]; | ||
| unsigned char whole_byte = 0; | ||
| char byte_chars[3] = {'\0','\0','\0'}; | ||
| int i; | ||
| for (i=0; i < [hexNoSpaces length] / 2; i++) { | ||
| byte_chars[0] = [hexNoSpaces characterAtIndex:i*2]; | ||
| byte_chars[1] = [hexNoSpaces characterAtIndex:i*2+1]; | ||
| whole_byte = strtol(byte_chars, NULL, 16); | ||
| [data appendBytes:&whole_byte length:1]; | ||
| } | ||
| return data; | ||
| } | ||
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| void usage() { | ||
| printf("Not like that\n"); | ||
| exit(2); | ||
| } | ||
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| int main(int argc, char * const argv[]) | ||
| { | ||
| @autoreleasepool { | ||
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| int decrypt_flag; | ||
| NSString *password = nil; | ||
| NSString *message = nil; | ||
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| char ch; | ||
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| /* options descriptor */ | ||
| struct option longopts[] = { | ||
| { "decrypt", no_argument, &decrypt_flag, 1 }, | ||
| { "password", required_argument, NULL, 'p' }, | ||
| { NULL, 0, NULL, 0 } | ||
| }; | ||
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| while ((ch = getopt_long(argc, argv, "dp:P", longopts, NULL)) != -1) | ||
| switch (ch) { | ||
| case 'd': | ||
| decrypt_flag = 1; | ||
| break; | ||
| case 'p': | ||
| password = [NSString stringWithUTF8String:optarg]; | ||
| break; | ||
| default: | ||
| usage(); | ||
| } | ||
| argc -= optind; | ||
| argv += optind; | ||
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| if (argc != 1) { | ||
| usage(); | ||
| } | ||
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| message = [NSString stringWithUTF8String:argv[0]]; | ||
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| NSError *error; | ||
| if (decrypt_flag) { | ||
| NSData *decryptedData = [RNDecryptor decryptData:GetDataForHex(message) | ||
| withPassword:password | ||
| error:&error]; | ||
| if (error) { | ||
| NSLog(@"Failed: %@", error); | ||
| exit(1); | ||
| } | ||
| else { | ||
| NSString *string = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding]; | ||
| if (string) { | ||
| printf("%s\n", [string UTF8String]); | ||
| } | ||
| else { | ||
| printf("%s\n", [[decryptedData description] UTF8String]); | ||
| } | ||
| } | ||
| } | ||
| return 0; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| // | ||
| // Prefix header for all source files of the 'rncrypt' target in the 'rncrypt' project | ||
| // | ||
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| #ifdef __OBJC__ | ||
| #import <Foundation/Foundation.h> | ||
| #endif |