Will, Thanks this is exactly what I needed.
> -----Original Message----- > From: owner-openssl-us...@openssl.org > [mailto:owner-openssl-us...@openssl.org] On Behalf Of Will Bickford > Sent: Wednesday, July 08, 2009 3:57 PM > To: openssl-users@openssl.org > Subject: RE: Need help please: calculate SHA256. > > > -----Original Message----- > > From: owner-openssl-us...@openssl.org > > [mailto:owner-openssl-us...@openssl.org] On Behalf Of Bizhan > > Gholikhamseh (bgholikh) > > Sent: Wednesday, July 08, 2009 5:38 PM > > To: openssl-users@openssl.org > > Subject: RE: Need help please: calculate SHA256. > > > > > > > > > -----Original Message----- > > > From: owner-openssl-us...@openssl.org > > > [mailto:owner-openssl-us...@openssl.org] On Behalf Of > David Schwartz > > > Sent: Wednesday, July 08, 2009 3:05 PM > > > To: openssl-users@openssl.org > > > Subject: RE: Need help please: calculate SHA256. > > > > > > > > > Bizhan Gholikhamseh wrote: > > > > > > > Hi all, > > > > I have an image that I need to calculate SHA256 has > > digest of image > > > > and encrypt the hash digest using my private key to > > generate image > > > > signature. > > > > > > > > Could someone please let me know how to use openssl to do this? > > > > > > 1) Calculate the SHA256 hash. > > > > > > 2) Sign it with the private key. > > > > > > If you want a more specific answer, you're going to have to > > ask a more > > > specific question. > > > > I have a text file, let us call it test.tx, which I need to send it > > through a secure mechanism to a remote site. > > I have already created a pair of public and private rsa key using > > openssl. > > I want to use openssl to generate a sha256 hash digest of the text > > file, i.e. test.tx --> test.hash. > > And encrypt the hash file with my private key i.e. test.hash > > --> test.sign. > > I believe this process is called signing the image (I am > very new in > > this area). > > > > Any help greatly appreciated, > > Here are a series of openssl commands you can use to encrypt > and generate a hash. I used AES-256 and SHA-384 in the example given. > > 1. echo "Hello" >foobar.txt > > 2. Encrypt: openssl aes256 -salt -in foobar.txt -out scrambled.txt > > 3. Decrypt: openssl aes256 -d -in scrambled.txt > > 4. Hash of Plaintext: openssl dgst -sha384 foobar.txt > - > 1d283e09aa7e597f2c0505c13f7c09eb4d4cd198fb7b144eeea2824cc59a04 > 6d9363b3f0 > 38abf7aa6bde7f8adaf561a4 > > 5. Hash of Ciphertext: openssl dgst -sha384 scrambled.txt > - > 27e251831d2fb862ca092e4f0dacadb5fe3954240e377c387e4e903a25a492 > ed2129106b > 993fb94fa709f7ca942e433f > > 6. ls -ltr > foobar.txt - 6 bytes > scrambed.txt - 32 bytes > > > > > --B > > > > > > > > > > Are you trying to write a program? Are you trying to use > > the 'openssl' > > > application? Is there some specific image signing format > > you're trying > > > to use? Who or what is supposed to be able to verify this > signature > > > and using what format? > > > > > > Your question is like "how can I use steel to build a > > bridge". You get > > > the steel and you form it into a bridge with tools. > > > > > > DS > > > > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
