(CkPython) Signing HTTP Messages

Demonstrates how to sign HTTP messages per draft-cavage-http-signatures-10

For more information, see https://tools.ietf.org/html/draft-cavage-http-signatures-10

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

bCrlf = True
sbPublicKeyPem = chilkat.CkStringBuilder()
sbPublicKeyPem.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf)
sbPublicKeyPem.AppendLine("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDCFENGw33yGihy92pDjZQhl0C3",bCrlf)
sbPublicKeyPem.AppendLine("6rPJj+CvfSC8+q28hxA161QFNUd13wuCTUcq0Qd2qsBe/2hFyc2DCJJg0h1L78+6",bCrlf)
sbPublicKeyPem.AppendLine("Z4UMR7EOcpfdUE9Hf3m/hs+FUR45uBJeDK1HSFHD8bHKD6kv8FPGfJTotc+2xjJw",bCrlf)
sbPublicKeyPem.AppendLine("oYi+1hqp1fIekaxsyQIDAQAB",bCrlf)
sbPublicKeyPem.AppendLine("-----END PUBLIC KEY-----",bCrlf)

pubKey = chilkat.CkPublicKey()
pubKey.LoadFromString(sbPublicKeyPem.getAsString())

sbPrivateKeyPem = chilkat.CkStringBuilder()
sbPrivateKeyPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",bCrlf)
sbPrivateKeyPem.AppendLine("MIICXgIBAAKBgQDCFENGw33yGihy92pDjZQhl0C36rPJj+CvfSC8+q28hxA161QF",bCrlf)
sbPrivateKeyPem.AppendLine("NUd13wuCTUcq0Qd2qsBe/2hFyc2DCJJg0h1L78+6Z4UMR7EOcpfdUE9Hf3m/hs+F",bCrlf)
sbPrivateKeyPem.AppendLine("UR45uBJeDK1HSFHD8bHKD6kv8FPGfJTotc+2xjJwoYi+1hqp1fIekaxsyQIDAQAB",bCrlf)
sbPrivateKeyPem.AppendLine("AoGBAJR8ZkCUvx5kzv+utdl7T5MnordT1TvoXXJGXK7ZZ+UuvMNUCdN2QPc4sBiA",bCrlf)
sbPrivateKeyPem.AppendLine("QWvLw1cSKt5DsKZ8UETpYPy8pPYnnDEz2dDYiaew9+xEpubyeW2oH4Zx71wqBtOK",bCrlf)
sbPrivateKeyPem.AppendLine("kqwrXa/pzdpiucRRjk6vE6YY7EBBs/g7uanVpGibOVAEsqH1AkEA7DkjVH28WDUg",bCrlf)
sbPrivateKeyPem.AppendLine("f1nqvfn2Kj6CT7nIcE3jGJsZZ7zlZmBmHFDONMLUrXR/Zm3pR5m0tCmBqa5RK95u",bCrlf)
sbPrivateKeyPem.AppendLine("412jt1dPIwJBANJT3v8pnkth48bQo/fKel6uEYyboRtA5/uHuHkZ6FQF7OUkGogc",bCrlf)
sbPrivateKeyPem.AppendLine("mSJluOdc5t6hI1VsLn0QZEjQZMEOWr+wKSMCQQCC4kXJEsHAve77oP6HtG/IiEn7",bCrlf)
sbPrivateKeyPem.AppendLine("kpyUXRNvFsDE0czpJJBvL/aRFUJxuRK91jhjC68sA7NsKMGg5OXb5I5Jj36xAkEA",bCrlf)
sbPrivateKeyPem.AppendLine("gIT7aFOYBFwGgQAQkWNKLvySgKbAZRTeLBacpHMuQdl1DfdntvAyqpAZ0lY0RKmW",bCrlf)
sbPrivateKeyPem.AppendLine("G6aFKaqQfOXKCyWoUiVknQJAXrlgySFci/2ueKlIE1QqIiLSZ8V8OlpFLRnb1pzI",bCrlf)
sbPrivateKeyPem.AppendLine("7U1yQXnTAEFYM560yJlzUpOb1V4cScGd365tiSMvxLOvTA==",bCrlf)
sbPrivateKeyPem.AppendLine("-----END RSA PRIVATE KEY-----",bCrlf)

privKey = chilkat.CkPrivateKey()
privKey.LoadPem(sbPrivateKeyPem.getAsString())

#    All examples use this request:
# 
#    POST /foo?param=value&pet=dog HTTP/1.1
#    Host: example.com
#    Date: Sun, 05 Jan 2014 21:31:40 GMT
#    Content-Type: application/json
#    Digest: SHA-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=
#    Content-Length: 18
# 
#    {"hello": "world"}

# C.1.  Default Test
# 
#    If a list of headers is not included, the date is the only header
#    that is signed by default.  The string to sign would be:
# 
#    date: Sun, 05 Jan 2014 21:31:40 GMT
# 
#    The Authorization header would be:
# 
#    Authorization: Signature keyId="Test",algorithm="rsa-sha256",
#    signature="SjWJWbWN7i0wzBvtPl8rbASWz5xQW6mcJmn+ibttBqtifLN7Sazz
#    6m79cNfwwb8DMJ5cou1s7uEGKKCs+FLEEaDV5lp7q25WqS+lavg7T8hc0GppauB
#    6hbgEKTwblDHYGEtbGmtdHgVCk9SuS13F0hZ8FD0k/5OxEPXe5WozsbM="
# 
#    The Signature header would be:
# 
#    Signature: keyId="Test",algorithm="rsa-sha256",
#    signature="SjWJWbWN7i0wzBvtPl8rbASWz5xQW6mcJmn+ibttBqtifLN7Sazz
#    6m79cNfwwb8DMJ5cou1s7uEGKKCs+FLEEaDV5lp7q25WqS+lavg7T8hc0GppauB
#    6hbgEKTwblDHYGEtbGmtdHgVCk9SuS13F0hZ8FD0k/5OxEPXe5WozsbM="
# 

dtNow = chilkat.CkDateTime()
success = dtNow.SetFromCurrentSystemTime()
dateStr = dtNow.getAsRfc822(False)

# To duplicate the above result, we'll hard-code the date string.
dateStr = "Sun, 05 Jan 2014 21:31:40 GMT"

rsa = chilkat.CkRsa()
success = rsa.ImportPrivateKeyObj(privKey)
if (success == False):
    print(rsa.lastErrorText())
    sys.exit()

sbStringToSign = chilkat.CkStringBuilder()
sbStringToSign.Append("date: ")
sbStringToSign.Append(dateStr)

rsa.put_EncodingMode("base64")
b64Signature = rsa.signStringENC(sbStringToSign.getAsString(),"SHA256")
print(b64Signature)
print("---------------------------")

# The result should be:
# SjWJWbWN7i0wzBvtPl8rbASW ... FD0k/5OxEPXe5WozsbM=

# ----------------------------------------------------------------------------------------------------

# C.2.  Basic Test
# 
#    The minimum recommended data to sign is the (request-target), host,
#    and date.  In this case, the string to sign would be:
# 
#    (request-target): post /foo?param=value&pet=dog
#    host: example.com
#    date: Sun, 05 Jan 2014 21:31:40 GMT
# 
#    The Authorization header would be:
# 
#    Authorization: Signature keyId="Test",algorithm="rsa-sha256",
#    headers="(request-target) host date", signature="qdx+H7PHHDZgy4
#    y/Ahn9Tny9V3GP6YgBPyUXMmoxWtLbHpUnXS2mg2+SbrQDMCJypxBLSPQR2aAjn
#    7ndmw2iicw3HMbe8VfEdKFYRqzic+efkb3nndiv/x1xSHDJWeSWkx3ButlYSuBs
#    kLu6kd9Fswtemr3lgdDEmn04swr2Os0="

sbStringToSign.Clear()
sbStringToSign.Append("(request-target): ")
sbStringToSign.AppendLine("post /foo?param=value&pet=dog",False)
sbStringToSign.Append("host: ")
sbStringToSign.AppendLine("example.com",False)
sbStringToSign.Append("date: ")
sbStringToSign.Append(dateStr)

print("StringToSign:")
print(sbStringToSign.getAsString())
b64Signature = rsa.signStringENC(sbStringToSign.getAsString(),"SHA256")
print(b64Signature)
print("---------------------------")

# The result should be:
# qdx+H7PHHDZgy4y/Ahn ... mn04swr2Os0=