Getting variable encryption results with VB.Net and DES -

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i'm working on semi-internal encryption process sensitive information. email addresses , like. i'm working few other developers @ sister companies on project, , requirements everyone's encryption can talk else's. use global password, encrypt , decrypt information onsite, , that's it.

my problem encryption procedure, while matching theirs, giving me variable results. i'm polling our sql server strings encrypted in question, iterating through array of results, , updating server encrypted strings.

the problem first string different subsequent strings, , isn't recognized valid testing software we're supposed basing our solution off of. second , subsequent strings come through fine.

example:

test@test.com - brpurplww7+vyrr5puj/jhxoip/mv5wr test@test.com - brpurplww79h+n4tgot0xrmm7sdwqqsy test@test.com - brpurplww79h+n4tgot0xrmm7sdwqqsy

i can't quite figure out what's going on, because can encrypt , decrypt , forth on own machine no issues. advice lovely.

my encryption function follows:

private tripledes new descryptoserviceprovider      sub new(byval key string)             dim ivhash(), keyhash() byte      keyhash = system.text.encoding.utf8.getbytes(key)     redim preserve keyhash(7)     tripledes.key = keyhash      ivhash = system.text.encoding.utf8.getbytes(string.empty)     redim preserve ivhash(7)     tripledes.iv = ivhash end sub  public function encryptdata(byval plaintext string) string     dim plaintextbytes() byte = system.text.encoding.utf8.getbytes(plaintext)     dim ms new system.io.memorystream     dim encstream new cryptostream(ms, tripledes.createencryptor(), system.security.cryptography.cryptostreammode.write)      tripledes.mode = ciphermode.ecb      encstream.write(plaintextbytes, 0, plaintextbytes.length)     encstream.flushfinalblock()      return convert.tobase64string(ms.toarray) end function  public function decryptdata(byval encryptedtext string) string     dim encryptedbytes() byte = convert.frombase64string(encryptedtext)     dim ms new system.io.memorystream     dim decstream new cryptostream(ms, tripledes.createdecryptor(), system.security.cryptography.cryptostreammode.write)      tripledes.mode = ciphermode.ecb      decstream.write(encryptedbytes, 0, encryptedbytes.length)     decstream.flushfinalblock()      return system.text.encoding.utf8.getstring(ms.toarray)  end function

you setting tripledes.mode = ciphermode.ecb after have called tripledes.createencryptor(), first encryption using default value of ciphermode.cbc. since tripledes reused, after first call encryptdata mode set correctly.

move tripledes.mode = ciphermode.ecb new , should work consistently.


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