StackOverflow2013

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plurals

PO
primarykey
Id
18070101
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-08-06T00:47:59.540
FavoriteCount
0
LastActivityDate
2013-08-06T13:56:47.687
LastEditDate
2013-08-06T13:56:47.687
LastEditorUserId
589259
OwnerUserId
589259
ParentId
18067303
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
A signature generation contains 3 distinct parts. First the hash is calculated, then padding is added and finally RSA performs modular exponentiation (possibly helped by using the Chinese Remainder Theorem to speed things up). All three of these parts of signature generation are part of the signature algorithm. It is wrong to think of signature generation as three distinct parts. It is particularly wrong to think of RSA signature generation as using RSA encryption. RSA encryption uses it's own padding mechanisms which are incompatible with the ones used for signing. This is all very well explained in the PKCS#1 v2.2 standard. <blockquote> The main mathematical operation in each primitive is exponentiation, as in the encryption and decryption primitives of Section 5.1. RSASP1 and RSAVP1 are the same as RSADP and RSAEP except for the names of their input and output arguments; they are distinguished as they are intended for different purposes. </blockquote> So even the standard very explicitly uses different functions, even though they perform essentially the same mathematical operation. The final outcome is simply this: you must use the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx" rel="nofollow"><code>RSACryptoServiceProvider</code></a> class for PKCS#1 v1.5 compatible signatures, or the Bouncy Castle C# libraries to use the newer RSA PSS signature scheme. If you want to create a signature for a pre-calculated hash, use <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.signhash.aspx" rel="nofollow"><code>SignHash</code></a>, although - as you mentioned - this function is currently restricted to SHA-1 or MD5.
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Title
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PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PODecryption using the public key
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USMaarten Bodewes
UserOwnerUserId
1. USMaarten Bodewes
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
1. PODecryption using the public key
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1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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 VTUpMod
2. VO
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1. This table or related slice is empty.

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