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(feat) add rsa-oaep algo support for JWE #58

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(feat) add rsa-oaep algo support for JWE #58

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1 change: 1 addition & 0 deletions lib/resty/evp.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ local ngx = ngx


local CONST = {
SHA1_DIGEST = "SHA1",
SHA256_DIGEST = "SHA256",
SHA512_DIGEST = "SHA512",
-- ref : https://github.com/openssl/openssl/blob/master/include/openssl/rsa.h
Expand Down
19 changes: 14 additions & 5 deletions lib/resty/jwt.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,7 @@ local str_const = {
A256CBC_HS512_CIPHER_MODE = "aes-256-cbc",
A256GCM = "A256GCM",
A256GCM_CIPHER_MODE = "aes-256-gcm",
RSA_OAEP = "RSA-OAEP",
RSA_OAEP_256 = "RSA-OAEP-256",
DIR = "dir",
reason = "reason",
Expand Down Expand Up @@ -255,7 +256,7 @@ local function parse_jwe(self, preshared_key, encoded_header, encoded_encrypted_
end

local alg = header.alg
if alg ~= str_const.DIR and alg ~= str_const.RSA_OAEP_256 then
if alg ~= str_const.DIR and alg ~= str_const.RSA_OAEP_256 and alg ~= str_const.RSA_OAEP then
error({reason="invalid algorithm: " .. alg})
end

Expand All @@ -265,11 +266,15 @@ local function parse_jwe(self, preshared_key, encoded_header, encoded_encrypted_
error({reason="preshared key must not be null"})
end
key, _, enc_key = derive_keys(header.enc, preshared_key)
elseif alg == str_const.RSA_OAEP_256 then
elseif alg == str_const.RSA_OAEP_256 or alg == str_const.RSA_OAEP then
if not preshared_key then
error({reason="rsa private key must not be null"})
end
local rsa_decryptor, err = evp.RSADecryptor:new(preshared_key, nil, evp.CONST.RSA_PKCS1_OAEP_PADDING, evp.CONST.SHA256_DIGEST)
local digest_alg = evp.CONST.SHA256_DIGEST
if alg == str_const.RSA_OAEP then
digest_alg = evp.CONST.SHA1_DIGEST
end
local rsa_decryptor, err = evp.RSADecryptor:new(preshared_key, nil, evp.CONST.RSA_PKCS1_OAEP_PADDING, digest_alg)
if err then
error({reason="failed to create rsa object: ".. err})
end
Expand Down Expand Up @@ -467,7 +472,7 @@ local function sign_jwe(self, secret_key, jwt_obj)
if alg == str_const.DIR then
_, mac_key, enc_key = derive_keys(enc, secret_key)
encrypted_key = ""
elseif alg == str_const.RSA_OAEP_256 then
elseif alg == str_const.RSA_OAEP_256 or alg == str_const.RSA_OAEP then
local cert, err
if secret_key:find("CERTIFICATE") then
cert, err = evp.Cert:new(secret_key)
Expand All @@ -477,7 +482,11 @@ local function sign_jwe(self, secret_key, jwt_obj)
if not cert then
error({reason="Decode secret is not a valid cert/public key: " .. (err and err or secret_key)})
end
local rsa_encryptor = evp.RSAEncryptor:new(cert, evp.CONST.RSA_PKCS1_OAEP_PADDING, evp.CONST.SHA256_DIGEST)
local digest_alg = evp.CONST.SHA256_DIGEST
if alg == str_const.RSA_OAEP then
digest_alg = evp.CONST.SHA1_DIGEST
end
local rsa_encryptor = evp.RSAEncryptor:new(cert, evp.CONST.RSA_PKCS1_OAEP_PADDING, digest_alg)
if err then
error("failed to create rsa object for encryption ".. err)
end
Expand Down
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