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) KeyProperties.PURPOSE_DECRYPT)
.setAlgorithmParameterSpec(new RSAKeyGenParameterSpec(2048, RSAKeyGenParameterSpec.F4))
.setDigests(KeyProperties.DIGEST_SHA1,
KeyProperties.DIGEST_SHA256)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
.setCertificateSerialNumber(BigInteger.ONE)
.setCertificateSubject(new X500Principal("CN=" + "PrivateKey"))
.setCertificateNotBefore(calendar.getTime())
.setCertificateNotAfter(endCalendar.getTime())
.setKeySize(2048).build());
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) KeyProperties.PURPOSE_DECRYPT)
.setAlgorithmParameterSpec(new RSAKeyGenParameterSpec(2048, RSAKeyGenParameterSpec.F4))
.setDigests(KeyProperties.DIGEST_SHA1,
KeyProperties.DIGEST_SHA256)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
.setCertificateSerialNumber(BigInteger.ONE)
.setCertificateSubject(new X500Principal("CN=" + "PrivateKey"))
.setCertificateNotBefore(calendar.getTime())
.setCertificateNotAfter(endCalendar.getTime())
.setKeySize(2048).build());
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) KeyProperties.PURPOSE_DECRYPT)
.setAlgorithmParameterSpec(new RSAKeyGenParameterSpec(2048, RSAKeyGenParameterSpec.F4))
.setDigests(KeyProperties.DIGEST_SHA1,
KeyProperties.DIGEST_SHA256)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
.setCertificateSerialNumber(BigInteger.ONE)
.setCertificateSubject(new X500Principal("CN=" + "PrivateKey"))
.setCertificateNotBefore(calendar.getTime())
.setCertificateNotAfter(endCalendar.getTime())
.setKeySize(2048).build());
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) KeyProperties.PURPOSE_DECRYPT)
.setAlgorithmParameterSpec(new RSAKeyGenParameterSpec(2048, RSAKeyGenParameterSpec.F4))
.setDigests(KeyProperties.DIGEST_SHA1,
KeyProperties.DIGEST_SHA256)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
.setCertificateSerialNumber(BigInteger.ONE)
.setCertificateSubject(new X500Principal("CN=" + "PrivateKey"))
.setCertificateNotBefore(calendar.getTime())
.setCertificateNotAfter(endCalendar.getTime())
.setKeySize(2048).build());
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
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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() IOException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
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 |
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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() IOException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
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() IOException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
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() IOException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
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() IOException
I created this key to use with RSA/ECB/OAEPWithSHA-256AndMGF1Padding algorithm.
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
edited Nov 14 '18 at 19:17
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
answered Nov 14 '18 at 18:31
AfshinAfshin
3,0761625
3,0761625
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 |
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