Converting a Java Keystore into PEM Format

Question

I am trying to convert from a Java keystore file into a PEM file using keytool and openssl applicactions  But I could not find a good way to do the conversion  Any ideas    Instead of converting the keystore directly into PEM I tried to create a PKCS12 file first and then convert into relevant PEM file and Keystore  But I could not establish a connection using them   Note that I just need a PEM file and a Keystore file to implement a secured connection  There is no restriction like  Start from a java keystore file      So starting from other formats is acceptable with my case   But a direct conversion method from jks to pem is preferable

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The keytool command will not allow you to export the private key from a key store  You have to write some Java code to do this  Open the key store  get the key you need  and save it to a file in PKCS  8 format  Save the associated certificate too   KeyStore ks   KeyStore getInstance  jks       Load the key store         char   password           Save the private key     FileOutputStream kos   new FileOutputStream  tmpkey der    Key pvt   ks getKey  your alias   password   kos write pvt getEncoded     kos flush    kos close       Save the certificate     FileOutputStream cos   new FileOutputStream  tmpcert der    Certificate pub   ks getCertificate  your alias    cos write pub getEncoded     cos flush    cos close      Use OpenSSL utilities to convert these files  which are in binary format  to PEM format   openssl pkcs8 -inform der -nocrypt  lt  tmpkey der  gt  tmpkey pem openssl x509 -inform der  lt  tmpcert der  gt  tmpcert pem

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It s pretty straightforward  using jdk6 at least       bash  keytool -keystore foo jks -genkeypair -alias foo           -dname  CN foo example com L Melbourne ST Victoria C AU  Enter keystore password    Re-enter new password   Enter key password for           RETURN if same as keystore password     bash  keytool -keystore foo jks -exportcert -alias foo            openssl x509 -inform der -text Enter keystore password   asdasd Certificate      Data          Version  3  0x2          Serial Number  1237334757  0x49c03ae5          Signature Algorithm  dsaWithSHA1         Issuer  C AU  ST Victoria  L Melbourne  CN foo example com         Validity             Not Before  Mar 18 00 05 57 2009 GMT             Not After   Jun 16 00 05 57 2009 GMT         Subject  C AU  ST Victoria  L Melbourne  CN foo example com         Subject Public Key Info              Public Key Algorithm  dsaEncryption             DSA Public Key                  pub                       00 e2 66 5c e0 2e da e0 6b a6 aa 97 64 59 14                      7e a6 2e 5a 45 f9 2f b5 2d f4 34 27 e6 53 c7     bash  keytool -importkeystore -srckeystore foo jks          -destkeystore foo p12          -srcstoretype jks          -deststoretype pkcs12 Enter destination keystore password    Re-enter new password   Enter source keystore password    Entry for alias foo successfully imported  Import command completed   1 entries successfully imported  0 entries failed or cancelled  bash  openssl pkcs12 -in foo p12 -out foo pem Enter Import Password  MAC verified OK Enter PEM pass phrase  Verifying - Enter PEM pass phrase   bash  openssl x509 -text -in foo pem Certificate      Data          Version  3  0x2          Serial Number  1237334757  0x49c03ae5          Signature Algorithm  dsaWithSHA1         Issuer  C AU  ST Victoria  L Melbourne  CN foo example com         Validity             Not Before  Mar 18 00 05 57 2009 GMT             Not After   Jun 16 00 05 57 2009 GMT         Subject  C AU  ST Victoria  L Melbourne  CN foo example com         Subject Public Key Info              Public Key Algorithm  dsaEncryption             DSA Public Key                  pub                       00 e2 66 5c e0 2e da e0 6b a6 aa 97 64 59 14                      7e a6 2e 5a 45 f9 2f b5 2d f4 34 27 e6 53 c7     bash  openssl dsa -text -in foo pem read DSA key Enter PEM pass phrase  Private-Key   1024 bit  priv      00 8f b1 af 55 63 92 7c d2 0f e6 f3 a2 f5 ff      1a 7a fe 8c 39 dd pub       00 e2 66 5c e0 2e da e0 6b a6 aa 97 64 59 14      7e a6 2e 5a 45 f9 2f b5 2d f4 34 27 e6 53 c7       You end up with    foo jks - keystore in java format  foo p12 - keystore in PKCS 12 format  foo pem - all keys and certs from keystore  in PEM format     This last file can be split up into keys and certificates if you like      Command summary - to create JKS keystore   keytool -keystore foo jks -genkeypair -alias foo       -dname  CN foo example com L Melbourne ST Victoria C AU    Command summary - to convert JKS keystore into PKCS 12 keystore  then into PEM file   keytool -importkeystore -srckeystore foo jks      -destkeystore foo p12      -srcstoretype jks      -deststoretype pkcs12  openssl pkcs12 -in foo p12 -out foo pem   if you have more than one certificate in your JKS keystore  and you want to only export the certificate and key associated with one of the aliases  you can use the following variation   keytool -importkeystore -srckeystore foo jks      -destkeystore foo p12      -srcalias foo      -srcstoretype jks      -deststoretype pkcs12  openssl pkcs12 -in foo p12 -out foo pem   Command summary - to compare JKS keystore to PEM file   keytool -keystore foo jks -exportcert -alias foo        openssl x509 -inform der -text  openssl x509 -text -in foo pem  openssl dsa -text -in foo pem

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Simplified instructions to converts a JKS file to PEM and KEY format   crt  amp   key    keytool -importkeystore -srckeystore  lt Source-Java-Key-Store-File gt  -destkeystore  lt Destination-Pkcs12-File gt  -srcstoretype jks -deststoretype pkcs12 -destkeypass  lt Destination-Key-Password gt   openssl pkcs12 -in  lt Destination-Pkcs12-File gt  -out  lt Destination-Pem-File gt   openssl x509 -outform der -in  lt Destination-Pem-File gt  -out  lt Destination-Crt-File gt   openssl rsa -in  lt Destination-Pem-File gt  -out  lt Destination-Key-File gt

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Try Keystore Explorer http   keystore-explorer org   KeyStore Explorer is an open source GUI replacement for the Java command-line utilities keytool and jarsigner  It does openssl pkcs12 as well

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I kept getting errors from openssl when using StoBor s command   MAC verified OK Error outputting keys and certificates 139940235364168 error 06065064 digital envelope routines EVP DecryptFinal ex bad decrypt evp enc c 535  139940235364168 error 23077074 PKCS12 routines PKCS12 pbe crypt pkcs12 cipherfinal error p12 decr c 97  139940235364168 error 2306A075 PKCS12 routines PKCS12 item decrypt d2i pkcs12 pbe crypt error p12 decr c 123    For some reason  only this style of command would work for my JKS file  keytool -importkeystore -srckeystore foo jks      -destkeystore foo p12      -srcstoretype jks      -srcalias mykey      -deststoretype pkcs12      -destkeypass DUMMY123   The key was setting destkeypass  the value of the argument did not matter

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I found a very interesting solution   http   www swview org node 191  Then  I divided the pair public private key into two files private key publi pem and it works

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Well  OpenSSL should do it handily from a  12 file   openssl pkcs12 -in pkcs-12-certificate-file -out pem-certificate-file openssl pkcs12 -in pkcs-12-certificate-and-key-file -out pem-certificate-and-key-file   Maybe more details on what the error failure is

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In case you don t have openssl installed and you are looking for a quick solution  there is software called portcle which is very useful and small to download   The disadvantage is that there is no command line as far as I know  But from the GUI  it is pretty straight forward to export a PEM private key    Open you JKS key store Right click over your private key entry and select export Select Private Key and certificates and PEM format

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Converting a Java Keystore into PEM Format   The most precise answer of all must be that this is NOT possible    A Java keystore is merely a storage facility for cryptographic keys and certificates while PEM is a file format for X 509 certificates only

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first create keystore file as  C  Program Files Android Android Studio jre bin keytool -keystore androidkey jks -genkeypair -alias androidkey   Enter keystore password  Re-enter new password  What is your first and last name    Unknown   FirstName LastName What is the name of your organizational unit    Unknown   Mobile Development What is the name of your organization    Unknown   your company name What is the name of your City or Locality  What is the name of your State or Province  What is the two-letter country code for this unit    Unknown   IN     press enter      Now it will ask to confirm   Is CN FirstName LastName  OU Mobile Development  O your company name  L CityName  ST StateName  C IN correct     no    yes    Enter key password for           RETURN if same as keystore password    press enter if you want same password     key has been generated  now you can simply get pem file using following command   C  Program Files Android Android Studio jre bin keytool -export -rfc -alias androidkey -file android certificate pem -keystore androidkey jks Enter keystore password  Certificate stored in file

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Direct conversion from jks to pem file using the keytool  keytool -exportcert -alias selfsigned -keypass password -keystore test-user jks -rfc -file test-user pem

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First dump the keystore from JKS to PKCS12  1   keytool -importkeystore -srckeystore    android debug keystore -destkeystore intermediate p12 -srcstoretype JKS -deststoretype PKCS12  Dump the new pkcs12 file into pem   openssl pkcs12 -in intermediate p12 -nodes -out intermediate rsa pem   You should have both the cert and private key in pem format  Split them up  Put the part between    BEGIN CERTIFICATE    and    END CERTIFICATE    into cert x509 pem Put the part between    BEGIN RSA PRIVATE KEY    and    END RSA PRIVATE KEY    into private rsa pem Convert the private key into pk8 format as expected by signapk  3  openssl pkcs8 -topk8 -outform DER -in private rsa pem -inform PEM -out private pk8 -nocrypt

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Converting a JKS KeyStore to a single PEM file can easily be accomplished using the following command    keytool -list -rfc -keystore  myKeystore jks    sed -e   - BEGIN  A-Z  -    - END  A-Z -   d   gt  gt   myKeystore pem    Explanation    keytool -list -rfc -keystore  myKeystore jks  lists everything in the  myKeyStore jks  KeyStore in PEM format  However  it also prints extra information    sed -e   - BEGIN  A-Z  -    - END  A-Z -   d  filters out everything we don t need  We are left with only the PEMs of everything in the KeyStore   gt  gt   myKeystore pem  write the PEMs to the file  myKeyStore pem

[java] Converting a Java Keystore into PEM Format

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