使用 Python3 的简单 S/MIME 电子邮件
项目描述
这个库使得在 Python 中创建 S/MIME 消息变得简单。它支持签名（使用 RSA 密钥）、加密（使用公共 RSA 密钥，在 AES128-CBC、AES192-CBC 或 AES256-CBC 模式下）以及两者的组合 - 首先对消息进行签名，然后对结果进行加密（“包裹”）。
python-smail 的基础是oscrypto库，它提供对 OpenSSL 的 C 绑定的访问并实现许多高级和低级功能。此外，还使用了asn1crypto，它是“用于解析和序列化 ASN.1 结构的快速、纯 Python 库”。.
要求
Python 3.5+
asn1crypto
oscrypto
例子
加密
下面的代码以 PEM 格式加载 Bob 的公钥，并使用它来加密 S/MIME 格式的电子邮件：
import os
from email.mime.text import MIMEText
from email.utils import formatdate
from smail import encrypt_message
message = MIMEText("This a plain text body!")
message['Date'] = formatdate(localtime=True)
message['From'] = "AliceRSA@example.com"
message['To'] = "BobRSA@example.com"
message['Subject'] = "Text Message - Encrypted"
cert = os.path.join('tests', 'testdata', 'BobRSASignByCarl.pem')
encrypted_message = encrypt_message(message, [cert])
print(encrypted_message.as_string())
输出：
MIME-Version: 1.0 Content-Type: application/pkcs7-mime; smime-type=enveloped-data; name=smime.p7m Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7m Date: Tue, 17 Mar 2020 19:58:17 +0100 From: AliceRSA@example.com To: BobRSA@example.com Subject: Plain Text Message MIIBhwYJKoZIhvcNAQcDoIIBeDCCAXQCAQAxgb4wgbsCAQAwJjASMRAwDgYDVQQD EwdDYXJsUlNBAhBGNGvHgABWvBHTbi7NXXHQMAsGCSqGSIb3DQEBAQSBgFmMsY5d H446eMYRwzVUREH2+Nv9VyflrA9rJlU/4yKqGGEnzt+YRPQaU+KoZ8iURaMB/GLE ZupCnJ79VAjs+RX6kyMtKMXvcsRkzR8GGGPLHNEbqqFmDY5VQrC/jA66w6/xPjdb hzVvf6SVWc4Aefv8xdQOMF1relsVahjvjFJrMIGtBgkqhkiG9w0BBwEwHQYJYIZI AWUDBAEqBBArK3YkdLMydTK8DyyQvUj+gIGAaC/h3NVeGcVpdkDI9iP4OxqC4chk BHeK+KpYJJYlelSt7D5LlRuRHjnRy3laU3bi1bxm0vxefx2ihf5rZRblpLWwnuft duFKvXKUX0Es6Q78LpY8Ng3IxMGYNMWiCTMyqDGgC32JRI3H8twsG0/NIoZxKDXQ 1k7QedeP0a+JhVc=
签约
下面的代码以 PEM 格式加载 Alice 的私钥和公钥，并使用它来签署 S/MIME 格式的电子邮件：
import os
from email.mime.text import MIMEText
from email.utils import formatdate
from smail import sign_message
message = MIMEText("This a plain text body!")
message['Date'] = formatdate(localtime=True)
message['From'] = "AliceRSA@example.com"
message['To'] = "BobRSA@example.com"
message['Subject'] = "Text Message - Signed"
key_signer = os.path.join('tests', 'testdata', 'AlicePrivRSASign.pem')
cert_signer = os.path.join('tests', 'testdata', 'AliceRSASignByCarl.pem')
signed_message = sign_message(message, key_signer, cert_signer)
print(signed_message.as_string())
输出：
MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg="sha-256"; boundary="----39D1127DF0061CD9BB50644B14CCEF86" Date: Tue, 17 Mar 2020 20:02:11 +0100 From: AliceRSA@example.com To: BobRSA@example.com Subject: Plain Text Message This is an S/MIME signed message ------39D1127DF0061CD9BB50644B14CCEF86 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit This a plain text body! ------39D1127DF0061CD9BB50644B14CCEF86 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIIEIwYJKoZIhvcNAQcCoIIEFDCCBBACAQExDzANBglghkgBZQMEAgEFADALBgkq hkiG9w0BBwGgggIwMIICLDCCAZWgAwIBAgIQRjRrx4AAVrwR024uxBCzsDANBgkq hkiG9w0BAQUFADASMRAwDgYDVQQDEwdDYXJsUlNBMB4XDTk5MDkxOTAxMDg0N1oX DTM5MTIzMTIzNTk1OVowEzERMA8GA1UEAxMIQWxpY2VSU0EwgZ8wDQYJKoZIhvcN AQEBBQADgY0AMIGJAoGBAOCJczmN2PX16Id2OX9OsAW7U4PeD7er3H3HdSkNBS5t Et+mhibU0m+qWCn8l+z6glEPMIC+sVCeRkTxLLvYMs/GaG8H2bBgrL7uNAlqE/X3 BQWT3166NVbZYf8Zf8mB5vhs6odAcO+sbSx0ny36VTq5mXcCpkhSjE7zVzhXdFdf AgMBAAGjgYEwfzAMBgNVHRMBAf8EAjAAMA4GA1UdDwEB/wQEAwIGwDAfBgNVHSME GDAWgBTp4JAnrHggeprTTPJCN04irp44uzAdBgNVHQ4EFgQUd9K00bdMioqjzkWd zuw8oDrj/1AwHwYDVR0RBBgwFoEUQWxpY2VSU0FAZXhhbXBsZS5jb20wDQYJKoZI hvcNAQEFBQADgYEAPnBHqEjME1iPylFxa042GF0EfoCxjU3MyqOPzH1WyLzPbrMc WakgqgWBqE4lradwFHUv9ceb0Q7pY9Jkt8ZmbnMhVN/0uiVdfUnTlGsiNnRzuErs L2Tt0z3Sp0LF6DeKtNufZ+S9n/n+dO/q+e5jatg/SyUJtdgadq7rm9tJsCIxggG3 MIIBswIBATAmMBIxEDAOBgNVBAMTB0NhcmxSU0ECEEY0a8eAAFa8EdNuLsQQs7Aw DQYJYIZIAWUDBAIBBQCggeQwGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkq hkiG9w0BCQUxDxcNMjAwMzE3MTkwMzExWjAvBgkqhkiG9w0BCQQxIgQgUif5fULV gZhmFxie/WS5nFWC/LtbcHtu/+jQU6vglvQweQYJKoZIhvcNAQkPMWwwajALBglg hkgBZQMEASowCwYJYIZIAWUDBAEWMAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAO BggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYIKoZIhvcN AwICASgwDQYJKoZIhvcNAQEBBQAEgYAG/ZqevJVJYWtImeIG/HHVe0F6gXEpFx43 FbsNV6kaFBOrfkgLICl/a6HaYu9xCHdS7bmiLlDs6qeofmyRAZgUBdDKySm+yjZc V1VLPuFuL9+BDcXarthOSnn4wbdRBhceRu7w8OnyoTtrwP58c0MiQVtyBQq1FuPZ WBKduWYjIg== ------39D1127DF0061CD9BB50644B14CCEF86--
签名和加密
下面的代码以 PEM 格式加载 Alice 的私钥和公钥以及 Bob 的公钥，并使用它来签署和加密 S/MIME 格式的电子邮件（从 Alice 到 Bob）：
import os
from email.mime.text import MIMEText
from email.utils import formatdate
from smail import sign_and_encrypt_message
message = MIMEText("This a plain text body!")
message['Date'] = formatdate(localtime=True)
message['From'] = "AliceRSA@example.com"
message['To'] = "BobRSA@example.com"
message['Subject'] = "Text Message - Signed and Encrypted"
key_signer = os.path.join('tests', 'testdata', 'AlicePrivRSASign.pem')
cert_signer = os.path.join('tests', 'testdata', 'AliceRSASignByCarl.pem')
cert = os.path.join('tests', 'testdata', 'BobRSASignByCarl.pem')
signed_encrypted_message = sign_and_encrypt_message(message, key_signer, cert_signer, [cert])
print(signed_encrypted_message.as_string())
输出：
MIME-Version: 1.0 Content-Type: application/pkcs7-mime; smime-type=enveloped-data; name=smime.p7m Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7m Date: Tue, 17 Mar 2020 20:05:34 +0100 From: AliceRSA@example.com To: BobRSA@example.com Subject: Text Message - Signed and Encrypted MIIIuQYJKoZIhvcNAQcDoIIIqjCCCKYCAQAxgb4wgbsCAQAwJjASMRAwDgYDVQQD EwdDYXJsUlNBAhBGNGvHgABWvBHTbi7NXXHQMAsGCSqGSIb3DQEBAQSBgH5C7eTN O6Yoqf/UCqMJw3Un+0ZV/Gw/LDbnrnnPCQmGx4kCMSvcvqQp3IJ1RBvvX0D9VkN1 g+5Xo+0i0nNXZ/62Be1hTMYxC9vkogq0Ec5x96X0KPs96CWJOUmGyHTt5IV/0TPN b3mMiOCIUrMDGBMAxCxPRrHfgMoM0L483xhPMIIH3gYJKoZIhvcNAQcBMB0GCWCG SAFlAwQBKgQQdY86v19IJTpgxFtu2Fr7xICCB7BQV92hMbAZlZhTyJJQYaiZgEr7 jBSaB9R7Hg8C+e81xUP3Kuo+qsnQ+CHyzYf293kTbfjrGj0DnoYDHz7zTBvhU25D 4Xf2lPp27UufW95KW8bixMy8nXUzzhGgBKnn23O187UDGU1BLlQ589cJHW02GRas OM6iKD892f2u5GvztkiBFajEUzlUlx4dHgFHBTRlLjG0AFePir+1ZfQPCt0IumeU MxTJaLVbfhQKgwQvaPzzVG3pSWFlvKZ0Ict0IeBUVhXVxvRbY43PPAB2ivcn0l8C x4LD7/jRFUjUXuvNn+j5swisb6gZDoSdyjAT0FPLAPyNR0A4OyhzYHis7nWr8kJ9 2nlXLcEaPurvrJd8fOHmjd2LwAEPNW1h74LFxIhVZid9AA1TPFeR/F/40hyhTl60 pNbASyY0idIWTvZeqrrnKJ+47VfdXuDZ0S8gyxLTpkl3ZVQ/p7qkLl3yyNWKBhA5 ifKLhPFfkZPKsTXRU/mqMQJhpjTkuOe7I6D82GHF2wYS1Q8OqvwAfenb7t3KVkr8 6EAhhmyiSOdp1bRH2sZjG5C9ResRu4d6m17apFF0eDgoKkJYnvrdFwNyqdcL1AHD yvhBkUbVya6LfxRddK3UteXN26n4aZMNZxLvP7DKzttujCMrcxmjERaL1unnfGHb Su0dvoTccaI+0Xz5KnCkPGI/BwMXLuIZj0OTR9Jd+ojhipfQgxCGwnGQhcNgrVgW sIurvNcsC3PNF2sfHD507LLTh47qmhSyZP0TNuciI8dDA+gYLhjRzrwVhF1FPVnn wBA5+J5uB6CWFwQqUBe/eJFXH3PAEYcEoisTVQxCQ91nSq5+WE78SYOz00EHu1It ZV6LcY8lFgnUqF4rIknJ9Hc2X2Za7bDNnSJFPVixxmAX9OeKnfPy15s6UWXrEndB BgA0mLPMng8NAO3cPuHrklYQW5X1qPlgXO7r5e3UCxR7kwuv4JAJcIYSqrOUzsN/ 3O2H58i5vYAkrhKgODSuZAz8kE0CPaW+7uBzmLyXqd7F2Z27U6gvcPulS7y/OUjw OmGA3SLszBlPK6lJu/eogU9I+qrOa1YExdi9RRD/5OpBHTQ7FAbP1VYDFqSU9LHO H9l92VlZ7s9CZfJhIPLC/dCPNP7s8p7esVoAizSdjAimjFead49EceH2p509mWaE fflRODIKpnUBmPdWCzLwoo1imzmbmTWKmK26ggpQZuC3kIq2mXYJFloIMiyvywKf ItlaOEeZ8HOeHy0RLHEakrCbIqDecYeVjStr3vHbOR9iHm+HNpR0eFFzf5kuU9Kg vPYktJfKTJQnrVj8RUeiCraAFFU0BXLoGiHzs+i0dYharTmB6W9J/1EuRxICojlz sBxT1CLYInSvb/kvZ/FBop5ACN2x40b/4BWzxVDr5YJ5jZ2oCa7QTh8R4NlEyS5l peNPD0ujQ43MYYURI/sT3QBygTAJgTbpCQ2LCB1ZoQb0eFecdrlHhXrmLau4s7Ak jA1jQW2vCO7VJiMf8xrQOEh2J4J0pQ863etYEIk30sTVSED9+z27XPf46OJ9MMhD ++w1itIkZcIumiWRTSh2W5z5bRJqapx6Etk2UVkWOWsUkd+iyyLKneZ+yGH8a4A0 IPHgWYA8grgqPPM0N5MUDXUwv6KN2MbhAxPJOh95I4/2ONokW4ko4Khgp44G3luE RD/7sVGklM1YUfxhJyICsmHuLVfJZC3EhTBKd8quFGM25Eaf4otVRwvEcSpqQ1LW 5DowcUkL0MdyVIJKYITYF94ey5rocF2xYkTVJ2T3P8q4UpT0zfp9uNHQTBzceFAV cWIL8CoMMAQMjZmkJpyNjsGTOsuYgTcLCma98gCSgEGQxeDtrDMI+5B4OTjvDB3E PkyMmJH4EuIG6Oy0UBuTNjXYobveSbReBq/ZX2MVU8aOFU3k2GyII3tnxgBrkWUe OTmZ/OBBZLmKwxhLm5cvgBUcZrwW0AwALcntljfDY4GpG/jsGVW5dspAS9UDbpKV osBcDSOuaBSENuuRA5Nz3qm5A6lE5cgtc/mfi4qZfr+chwyylMqpJ8GqVrWBbMYk XOgAW2wQTYzhYqU5WYRNDg3CBzs8ijHiMqH6Kj8w2sH6WpKPBl+kuW6jXo5PlxDa g2kJWBMrJ/5PA8s6uCwPGbRoCXpQIxCn1zaa/suNZ9JNJErxd5uLWYDcsiQlizpe Py/nFWCfVHtxbGKKdPb56XrbD4VBdZcaz+/AVIxTCnOgGMg1b5w59ePkpbc6idD7 j7FI52vx5ArUH5U+38+xqI4s/Hfjqv7jIb0ZbLpenCyMMn+3pcWIMUqrsvNjv9uk XxjfnFumKq7XyFM/DUGwS/22C889LpXl6EiB651pIpt6aZIMWuCiMBMASD+QKjW1 YXa+OID8K+0At6WIQSVYph5Pq4w8ldT9zR2TfLTOWUwFRm/aku0AjSraNAxaGiLO kr+UdgYOpP4u6qAZwUHco1gmRRQQ8omNiJoQNOcKSvj6R38xzc/MrlQi1s5Tdoh7 nG76s6DJuzQQeKgYgZJbRP07jgbpZTsm5017jTnkSeQ8WnnM6eLR2HHLXJo1X4vo e3FI2iig5N6ytDwcN2MGTzr0SuhUe+JEQys2z2A=
致谢
Python SMAIL深受python-smime的启发，实际上是该代码库的一个分支。所有学分归原作者所有。
执照
该软件根据 Apache 许可证 2.0 获得许可。有关完整的许可证文本，请参阅顶部分发目录中的 LICENSE 文件。
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源分布
python-smail-0.9.0.tar.gz
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内置分布
python_smail-0.9.0-py2-none-any.whl
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