Android KeyStore parameters building
I'm trying to use RSA encryption with KeyStore and I need to specify Parameters for KeyPairGenerator and I'm lost here. KeyPairGeneratorPair is kinda straightforward, but I don't understand KeyGenParameterSpec for API>=23
That's what I did, I think I got everything in else part, but now I'm confused about KeyGenParameterSpec
What exactly public exponent in RSAKeyGenParameterSpec is?
What Digests in .setDigests should i specify?
There's also .setBlockMode() method to call, and since I'm using RSA and RSA/None/OAEPWithSHA1AndMGF1Paddingwhich block mode to set? ECB, CBC?
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
generator.initialize(new KeyGenParameterSpec.Builder("PrivateKey", KeyProperties.PURPOSE_ENCRYPT else
generator.initialize(new KeyPairGeneratorSpec.Builder(MainActivity.this)
.setAlias("PrivateKey")
.setSerialNumber(BigInteger.ONE)
.setSubject(new X500Principal("CN=" + "PrivateKey"))
.setStartDate(calendar.getTime())
.setEndDate(endCalendar.getTime())
.setKeySize(2048).build()
);
Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding");
android encryption rsa keystore asked Nov 14 '18 at 18:21
WiktorWiktor
13711
add a comment |
I'm trying to use RSA encryption with KeyStore and I need to specify Parameters for KeyPairGenerator and I'm lost here. KeyPairGeneratorPair is kinda straightforward, but I don't understand KeyGenParameterSpec for API>=23
That's what I did, I think I got everything in else part, but now I'm confused about KeyGenParameterSpec
What exactly public exponent in RSAKeyGenParameterSpec is?
What Digests in .setDigests should i specify?
There's also .setBlockMode() method to call, and since I'm using RSA and RSA/None/OAEPWithSHA1AndMGF1Paddingwhich block mode to set? ECB, CBC?
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
generator.initialize(new KeyGenParameterSpec.Builder("PrivateKey", KeyProperties.PURPOSE_ENCRYPT else
generator.initialize(new KeyPairGeneratorSpec.Builder(MainActivity.this)
.setAlias("PrivateKey")
.setSerialNumber(BigInteger.ONE)
.setSubject(new X500Principal("CN=" + "PrivateKey"))
.setStartDate(calendar.getTime())
.setEndDate(endCalendar.getTime())
.setKeySize(2048).build()
);
Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding");
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
add a comment |
I'm trying to use RSA encryption with KeyStore and I need to specify Parameters for KeyPairGenerator and I'm lost here. KeyPairGeneratorPair is kinda straightforward, but I don't understand KeyGenParameterSpec for API>=23
That's what I did, I think I got everything in else part, but now I'm confused about KeyGenParameterSpec
What exactly public exponent in RSAKeyGenParameterSpec is?
What Digests in .setDigests should i specify?
There's also .setBlockMode() method to call, and since I'm using RSA and RSA/None/OAEPWithSHA1AndMGF1Paddingwhich block mode to set? ECB, CBC?
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
generator.initialize(new KeyGenParameterSpec.Builder("PrivateKey", KeyProperties.PURPOSE_ENCRYPT else
generator.initialize(new KeyPairGeneratorSpec.Builder(MainActivity.this)
.setAlias("PrivateKey")
.setSerialNumber(BigInteger.ONE)
.setSubject(new X500Principal("CN=" + "PrivateKey"))
.setStartDate(calendar.getTime())
.setEndDate(endCalendar.getTime())
.setKeySize(2048).build()
);
Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding");
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
I'm trying to use RSA encryption with KeyStore and I need to specify Parameters for KeyPairGenerator and I'm lost here. KeyPairGeneratorPair is kinda straightforward, but I don't understand KeyGenParameterSpec for API>=23
That's what I did, I think I got everything in else part, but now I'm confused about KeyGenParameterSpec
What exactly public exponent in RSAKeyGenParameterSpec is?
What Digests in .setDigests should i specify?
There's also .setBlockMode() method to call, and since I'm using RSA and RSA/None/OAEPWithSHA1AndMGF1Paddingwhich block mode to set? ECB, CBC?
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
generator.initialize(new KeyGenParameterSpec.Builder("PrivateKey", KeyProperties.PURPOSE_ENCRYPT else
generator.initialize(new KeyPairGeneratorSpec.Builder(MainActivity.this)
.setAlias("PrivateKey")
.setSerialNumber(BigInteger.ONE)
.setSubject(new X500Principal("CN=" + "PrivateKey"))
.setStartDate(calendar.getTime())
.setEndDate(endCalendar.getTime())
.setKeySize(2048).build()
);
Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding");
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
asked Nov 14 '18 at 18:21
WiktorWiktor
13711
13711
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Method setDigests() sets digest method for your padding mode and setBlockMode() sets encryption mode which depends on your work.
I think you have set a lot of unnecessary field. For example I use this method to create my own RSA key:
public boolean createKey()
try
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA,
"AndroidKeyStore"
);
mKeyStore.load(null);
KeyGenParameterSpec.Builder builder =
new KeyGenParameterSpec.Builder(
MY_KEY,
KeyProperties.PURPOSE_DECRYPT).
setKeySize(MY_KEYLEN).
setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP).
setDigests(KeyProperties.DIGEST_SHA256);
keyPairGenerator.initialize(builder.build());
keyPairGenerator.generateKeyPair();
catch (NoSuchAlgorithmException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i useOAEPWithSHA1does that mean that i should useSHA1?
– Wiktor
Nov 14 '18 at 18:42
1
@Wiktor depends on cipher that you want to use. For example I created this key to use inRSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needsSHA-256digest.
– Afshin
Nov 14 '18 at 18:54
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53306534%2fandroid-keystore-parameters-building%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Method setDigests() sets digest method for your padding mode and setBlockMode() sets encryption mode which depends on your work.
I think you have set a lot of unnecessary field. For example I use this method to create my own RSA key:
public boolean createKey()
try
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA,
"AndroidKeyStore"
);
mKeyStore.load(null);
KeyGenParameterSpec.Builder builder =
new KeyGenParameterSpec.Builder(
MY_KEY,
KeyProperties.PURPOSE_DECRYPT).
setKeySize(MY_KEYLEN).
setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP).
setDigests(KeyProperties.DIGEST_SHA256);
keyPairGenerator.initialize(builder.build());
keyPairGenerator.generateKeyPair();
catch (NoSuchAlgorithmException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i useOAEPWithSHA1does that mean that i should useSHA1?
– Wiktor
Nov 14 '18 at 18:42
1
@Wiktor depends on cipher that you want to use. For example I created this key to use inRSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needsSHA-256digest.
– Afshin
Nov 14 '18 at 18:54
add a comment |
Method setDigests() sets digest method for your padding mode and setBlockMode() sets encryption mode which depends on your work.
I think you have set a lot of unnecessary field. For example I use this method to create my own RSA key:
public boolean createKey()
try
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA,
"AndroidKeyStore"
);
mKeyStore.load(null);
KeyGenParameterSpec.Builder builder =
new KeyGenParameterSpec.Builder(
MY_KEY,
KeyProperties.PURPOSE_DECRYPT).
setKeySize(MY_KEYLEN).
setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP).
setDigests(KeyProperties.DIGEST_SHA256);
keyPairGenerator.initialize(builder.build());
keyPairGenerator.generateKeyPair();
catch (NoSuchAlgorithmException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i useOAEPWithSHA1does that mean that i should useSHA1?
– Wiktor
Nov 14 '18 at 18:42
1
@Wiktor depends on cipher that you want to use. For example I created this key to use inRSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needsSHA-256digest.
– Afshin
Nov 14 '18 at 18:54
add a comment |
Method setDigests() sets digest method for your padding mode and setBlockMode() sets encryption mode which depends on your work.
I think you have set a lot of unnecessary field. For example I use this method to create my own RSA key:
public boolean createKey()
try
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA,
"AndroidKeyStore"
);
mKeyStore.load(null);
KeyGenParameterSpec.Builder builder =
new KeyGenParameterSpec.Builder(
MY_KEY,
KeyProperties.PURPOSE_DECRYPT).
setKeySize(MY_KEYLEN).
setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP).
setDigests(KeyProperties.DIGEST_SHA256);
keyPairGenerator.initialize(builder.build());
keyPairGenerator.generateKeyPair();
catch (NoSuchAlgorithmException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
Method setDigests() sets digest method for your padding mode and setBlockMode() sets encryption mode which depends on your work.
I think you have set a lot of unnecessary field. For example I use this method to create my own RSA key:
public boolean createKey()
try
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA,
"AndroidKeyStore"
);
mKeyStore.load(null);
KeyGenParameterSpec.Builder builder =
new KeyGenParameterSpec.Builder(
MY_KEY,
KeyProperties.PURPOSE_DECRYPT).
setKeySize(MY_KEYLEN).
setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP).
setDigests(KeyProperties.DIGEST_SHA256);
keyPairGenerator.initialize(builder.build());
keyPairGenerator.generateKeyPair();
catch (NoSuchAlgorithmException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
edited Nov 14 '18 at 19:17
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0361625
3,0361625
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i useOAEPWithSHA1does that mean that i should useSHA1?
– Wiktor
Nov 14 '18 at 18:42
1
@Wiktor depends on cipher that you want to use. For example I created this key to use inRSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needsSHA-256digest.
– Afshin
Nov 14 '18 at 18:54
add a comment |
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i useOAEPWithSHA1does that mean that i should useSHA1?
– Wiktor
Nov 14 '18 at 18:42
1
@Wiktor depends on cipher that you want to use. For example I created this key to use inRSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needsSHA-256digest.
– Afshin
Nov 14 '18 at 18:54
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i use
OAEPWithSHA1 does that mean that i should use SHA1?– Wiktor
Nov 14 '18 at 18:42
Oh, so i don't need to specify those fields at all. One more thing, how do I know which Digest to use? Like SHA256 or SHA512? If i use
OAEPWithSHA1 does that mean that i should use SHA1?– Wiktor
Nov 14 '18 at 18:42
1
1
@Wiktor depends on cipher that you want to use. For example I created this key to use in
RSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needs SHA-256 digest.– Afshin
Nov 14 '18 at 18:54
@Wiktor depends on cipher that you want to use. For example I created this key to use in
RSA/ECB/OAEPWithSHA-256AndMGF1Padding. This algorithm needs SHA-256 digest.– Afshin
Nov 14 '18 at 18:54
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53306534%2fandroid-keystore-parameters-building%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
