參考：http://baijiahao.baidu.com/s?id=1596614770784685300&wfr=spider&for=pc

cryptogen是Hyperledger Fabric提供的為網絡實體生成加密材料（公私鑰、證書等）的實用程序。這些證書代表一個身份，并允許在網絡實體間通信和交易時進行簽名和身份認證。

cryptogen使用一個包含網絡拓撲的crypto-config.yaml文件，為文件中定義的組織和屬于這些組織的實體生成一組證書和密鑰。每個組織都配置了唯一的根證書（ca-cert），并包含了特定實體（peers和orders），這就形成了一種典型的網絡結構——每個成員都有所屬的CA。在hyperledger中文文檔學習-4-構建第一個fabric網絡這個例子中就有一個crypto-config.yaml文件，如下：

# Copyright IBM Corp. All Rights Reserved. # # SPDX-License-Identifier: Apache-2.0 ## --------------------------------------------------------------------------- # "OrdererOrgs" - Definition of organizations managing orderer nodes # --------------------------------------------------------------------------- OrdererOrgs:# ---------------------------------------------------------------------------# Orderer# ---------------------------------------------------------------------------- Name: OrdererDomain: example.com# ---------------------------------------------------------------------------# "Specs" - See PeerOrgs below for complete description# ---------------------------------------------------------------------------Specs:- Hostname: orderer # --------------------------------------------------------------------------- # "PeerOrgs" - Definition of organizations managing peer nodes # --------------------------------------------------------------------------- PeerOrgs:# ---------------------------------------------------------------------------# Org1# ---------------------------------------------------------------------------- Name: Org1Domain: org1.example.comEnableNodeOUs: true# ---------------------------------------------------------------------------# "Specs"# ---------------------------------------------------------------------------# Uncomment this section to enable the explicit definition of hosts in your# configuration. Most users will want to use Template, below## Specs is an array of Spec entries. Each Spec entry consists of two fields:# - Hostname: (Required) The desired hostname, sans the domain.# - CommonName: (Optional) Specifies the template or explicit override for# the CN. By default, this is the template:## "{{.Hostname}}.{{.Domain}}"## which obtains its values from the Spec.Hostname and# Org.Domain, respectively.# ---------------------------------------------------------------------------# Specs:# - Hostname: foo # implicitly "foo.org1.example.com"# CommonName: foo27.org5.example.com # overrides Hostname-based FQDN set above# - Hostname: bar# - Hostname: baz# ---------------------------------------------------------------------------# "Template"# ---------------------------------------------------------------------------# Allows for the definition of 1 or more hosts that are created sequentially# from a template. By default, this looks like "peer%d" from 0 to Count-1.# You may override the number of nodes (Count), the starting index (Start)# or the template used to construct the name (Hostname).## Note: Template and Specs are not mutually exclusive. You may define both# sections and the aggregate nodes will be created for you. Take care with# name collisions# ---------------------------------------------------------------------------Template:Count: 2# Start: 5# Hostname: {{.Prefix}}{{.Index}} # default# ---------------------------------------------------------------------------# "Users"# ---------------------------------------------------------------------------# Count: The number of user accounts _in addition_ to Admin# ---------------------------------------------------------------------------Users:Count: 1# ---------------------------------------------------------------------------# Org2: See "Org1" for full specification# ---------------------------------------------------------------------------- Name: Org2Domain: org2.example.comEnableNodeOUs: trueTemplate:Count: 2Users:Count: 1

聲明了一個排序組織，兩個節點組織，節點組織中分別一個用戶帶著有兩個節點。在這里會為每個組織都配置一個根證書。

crypto-config.yaml是cryptogen工具使用的配置文件，cryptogen工具根據該配置文件生成加密材料。

??但該文件名字并非固定，也可自定義，只需在cryptogen generate命令中指定對應文件即可。

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由上面可知cryptogen是一個獨立的可執行程序，源碼能夠在github.com/hyperledger/fabric/common/tools/cryptogen/上找到，首先在構建好的虛擬機上面查看是否成功運行了cryptogen：

vagrant@ubuntu-xenial:~/fabric-samples/first-network$ cryptogen --help cryptogen: command not found

可見并沒有

那么首先我們就要編譯生成該可執行文件，有兩種辦法：

1）在下載的hyperledger/fabric路徑下運行命令:

然后就能夠看見生成了文件夾./build/bin,并在該文件夾下生成了可執行文件cryptogen：

vagrant@ubuntu-xenial:/opt/gopath/src/github.com/hyperledger/fabric$ make cryptogen .build/bin/cryptogen CGO_CFLAGS=" " GOBIN=/opt/gopath/src/github.com/hyperledger/fabric/.build/bin go install -tags "" -ldflags "-X github.com/hyperledger/fabric/common/tools/cryptogen/metadata.CommitSHA=325999f" github.com/hyperledger/fabric/common/tools/cryptogen Binary available as .build/bin/cryptogen

然后運行：

vagrant@ubuntu-xenial:/opt/gopath/src/github.com/hyperledger/fabric$ cryptogen --help usage: cryptogen [<flags>] <command> [<args> ...]用于生成Hyperledger Fabric密鑰文件Flags:--help 顯示幫助信息--help-long 顯示詳細幫助信息--help-manCommands:help [<command>...]顯示下面命令的幫助信息.generate [<flags>]生成密鑰文件showtemplate顯示默認的配置模版version顯示版本信息extend [<flags>]擴展現存網絡

由上面可見成功編譯成功

里面的命令中最重要的是generate命令：

vagrant@ubuntu-xenial:/opt/gopath/src/github.com/hyperledger/fabric$ cryptogen help generate usage: cryptogen generate [<flags>]生成密鑰證書Flags:--help Show context-sensitive help (also try --help-longand --help-man).--output="crypto-config" 指定放置證書的輸出目錄--config=CONFIG 指定使用的配置模版，不指定則使用cryptogen showtemplate中指定的默認模版，一般為crypto-config.yaml

最常見的命令為：

cryptogen generate --config=./crypto-config.yaml

即根據crypto-config.yaml文件的配置，生成組織信息及其密鑰證書等，保存在crypto-config目錄下。

2）另一種方法是直接在fabric/common/tools/cryptogen/下執行go build命令

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轉載于:https://www.cnblogs.com/wanghui-garcia/p/10491836.html

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