base64 python无第三方库
时间: 2023-11-05 13:17:16 浏览: 32
要在Python中进行Base64编码和解码而不使用第三方库,可以使用标准库中的`base64`模块。下面是一个示例:
```python
import base64
# 编码
message = "Hello, World!"
encoded_message = base64.b64encode(message.encode("utf-8"))
print(encoded_message.decode("utf-8"))
# 解码
decoded_message = base64.b64decode(encoded_message).decode("utf-8")
print(decoded_message)
```
输出:
```
SGVsbG8sIFdvcmxkIQ==
Hello, World!
```
在上面的示例中,`base64.b64encode()`函数用于对字符串进行编码,`base64.b64decode()`函数用于解码。请注意,编码和解码之后的结果是字节字符串,如果需要将其转换为普通的字符串,需要使用`.decode("utf-8")`方法。
相关问题
python的第三方库实现SM2
SM2是一种国家密码算法,其标准由中国国家密码管理局发布。Python的第三方库中,PyCryptodome库可以实现SM2算法。
以下是一个使用PyCryptodome库的例子:
```python
from Crypto.PublicKey import ECC
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from Crypto.Hash import SHA256, SHA512, SM3
from Crypto.Signature import DSS
from Crypto.Util.asn1 import DerSequence
from Crypto.Util import asn1
from base64 import b64decode, b64encode
# 生成SM2公私钥对
key = ECC.generate(curve='sm2p256v1')
private_key = key.export_key(format='DER', use_pkcs8=True)
public_key = key.public_key().export_key(format='DER')
# SM2加密
def sm2_encrypt(plain_text, public_key):
cipher_text = ''
try:
recipient_key = ECC.import_key(public_key)
aes_key = SHA256.new(plain_text.encode('utf-8')).digest()
cipher = AES.new(aes_key, AES.MODE_ECB)
k = SM3.new().digest()
c1 = recipient_key.pointQ * int.from_bytes(k, 'big')
c1 = b'\x04' + c1.x.to_bytes(32, 'big') + c1.y.to_bytes(32, 'big')
t = SM3.new(c1).digest()
x1, y1 = recipient_key.pointQ.x, recipient_key.pointQ.y
x2, y2 = (int.from_bytes(t, 'big') ^ int.from_bytes(k, 'big')).to_bytes(32, 'big'), \
(int.from_bytes(SM3.new(plain_text.encode('utf-8')).digest(), 'big') ^ int.from_bytes(k, 'big')).to_bytes(32, 'big')
c2 = cipher.encrypt(pad(plain_text.encode('utf-8'), AES.block_size))
c3 = SM3.new((x2 + y2 + c2)).digest()
cipher_text = b64encode(c1 + c2 + c3).decode('utf-8')
except Exception as e:
print(e)
return cipher_text
# SM2解密
def sm2_decrypt(cipher_text, private_key):
plain_text = ''
try:
recipient_key = ECC.import_key(private_key)
cipher_text = b64decode(cipher_text.encode('utf-8'))
c1 = cipher_text[:65]
c2 = cipher_text[65:-32]
c3 = cipher_text[-32:]
t = SM3.new(c1).digest()
x2, y2 = int.from_bytes(c1[1:33], 'big'), int.from_bytes(c1[33:], 'big')
x1, y1 = recipient_key.pointQ.x, recipient_key.pointQ.y
u = (y2 * x1 - y1 * x2)
v = x2 - x1
z = recipient_key.d * u // v
k = (SM3.new(z.to_bytes(32, 'big')).digest()) ^ t
aes_key = SHA256.new(k).digest()
cipher = AES.new(aes_key, AES.MODE_ECB)
plain_text = unpad(cipher.decrypt(c2), AES.block_size).decode('utf-8')
except Exception as e:
print(e)
return plain_text
# SM2签名
def sm2_sign(data, private_key):
signature = ''
try:
key = ECC.import_key(private_key)
h = SHA256.new(data.encode('utf-8'))
k = int.from_bytes(SM3.new().digest(), 'big')
r, s = DSS.new(key, 'fips-186-3').sign(h)
sig = asn1.DerSequence([r, s])
signature = b64encode(sig.encode()).decode('utf-8')
except Exception as e:
print(e)
return signature
# SM2验签
def sm2_verify(data, signature, public_key):
result = False
try:
key = ECC.import_key(public_key)
h = SHA256.new(data.encode('utf-8'))
sig = DerSequence(b64decode(signature.encode('utf-8')))
r, s = sig[0], sig[1]
verifier = DSS.new(key, 'fips-186-3')
verifier.verify(h, (r, s))
result = True
except Exception as e:
print(e)
return result
```
以上代码中,`sm2_encrypt`函数用于SM2加密,`sm2_decrypt`函数用于SM2解密,`sm2_sign`函数用于SM2签名,`sm2_verify`函数用于SM2验签。其中,`public_key`和`private_key`分别为SM2公钥和私钥,`plain_text`为明文,`cipher_text`为密文,`data`为要签名的数据,`signature`为签名结果。
第三方文件地址能转base64吗
可以将第三方文件转换为Base64编码。你可以使用编程语言中的相关库或工具来实现这个功能。例如,如果你使用Python,你可以使用base64模块来完成这个任务。以下是一个示例代码:
```python
import base64
def file_to_base64(file_path):
with open(file_path, "rb") as file:
encoded_string = base64.b64encode(file.read())
return encoded_string.decode("utf-8")
# 使用示例
file_path = "/path/to/file.ext"
base64_string = file_to_base64(file_path)
print(base64_string)
```
你需要将`file_path`替换为你想要转换的文件的实际路径。运行代码后,它将返回文件的Base64编码字符串。请记住,这种方法适用于较小的文件,因为将大文件转换为Base64编码可能会导致性能问题。