Generate SHA1 with a certain prefix











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I was wondering if there is an algorithm that I can use in order to generate a SHA1 string with a certain prefix by starting from a certain string:



const prefix = '0a12'

const prefix_sha = '111'

suffix = random_str()



while not SHA1(prefix + suffix).starts(prefix_sha):

   suffix = update_suffix(suffix)


For example, in this case, the loop must exit when we found an hash which starts with 111. For the hash function I'm using this:



hashlib.sha1(s.encode('utf-8')).hexdigest()


where s is a string.






cryptography sha1







share|improve this question
























  • What is the aim?
    – kelalaka
    Nov 4 at 12:01










  • What is the aim of your question?
    – Surcle
    Nov 4 at 12:15












  • SHA1 is shattered, but this is different, and you are the one seeking an answer here. The code you write gives no information at all, where is SHA1?
    – kelalaka
    Nov 4 at 12:19






  • 1




    I assume this question is a duplicate of crypto.stackexchange.com/questions/22736/sha1-partial-collision
    – Robert
    Nov 4 at 12:22










  • I updated the pseudocode
    – Surcle
    Nov 4 at 12:23















up vote
-1
down vote

favorite












I was wondering if there is an algorithm that I can use in order to generate a SHA1 string with a certain prefix by starting from a certain string:



const prefix = '0a12'

const prefix_sha = '111'

suffix = random_str()



while not SHA1(prefix + suffix).starts(prefix_sha):

   suffix = update_suffix(suffix)


For example, in this case, the loop must exit when we found an hash which starts with 111. For the hash function I'm using this:



hashlib.sha1(s.encode('utf-8')).hexdigest()


where s is a string.






cryptography sha1







share|improve this question
























  • What is the aim?
    – kelalaka
    Nov 4 at 12:01










  • What is the aim of your question?
    – Surcle
    Nov 4 at 12:15












  • SHA1 is shattered, but this is different, and you are the one seeking an answer here. The code you write gives no information at all, where is SHA1?
    – kelalaka
    Nov 4 at 12:19






  • 1




    I assume this question is a duplicate of crypto.stackexchange.com/questions/22736/sha1-partial-collision
    – Robert
    Nov 4 at 12:22










  • I updated the pseudocode
    – Surcle
    Nov 4 at 12:23













up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











I was wondering if there is an algorithm that I can use in order to generate a SHA1 string with a certain prefix by starting from a certain string:



const prefix = '0a12'

const prefix_sha = '111'

suffix = random_str()



while not SHA1(prefix + suffix).starts(prefix_sha):

   suffix = update_suffix(suffix)


For example, in this case, the loop must exit when we found an hash which starts with 111. For the hash function I'm using this:



hashlib.sha1(s.encode('utf-8')).hexdigest()


where s is a string.






cryptography sha1







share|improve this question















I was wondering if there is an algorithm that I can use in order to generate a SHA1 string with a certain prefix by starting from a certain string:



const prefix = '0a12'

const prefix_sha = '111'

suffix = random_str()



while not SHA1(prefix + suffix).starts(prefix_sha):

   suffix = update_suffix(suffix)


For example, in this case, the loop must exit when we found an hash which starts with 111. For the hash function I'm using this:



hashlib.sha1(s.encode('utf-8')).hexdigest()


where s is a string.






cryptography sha1




cryptography sha1






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 7 at 7:52

























asked Nov 4 at 11:53









Surcle

18913




18913












  • What is the aim?
    – kelalaka
    Nov 4 at 12:01










  • What is the aim of your question?
    – Surcle
    Nov 4 at 12:15












  • SHA1 is shattered, but this is different, and you are the one seeking an answer here. The code you write gives no information at all, where is SHA1?
    – kelalaka
    Nov 4 at 12:19






  • 1




    I assume this question is a duplicate of crypto.stackexchange.com/questions/22736/sha1-partial-collision
    – Robert
    Nov 4 at 12:22










  • I updated the pseudocode
    – Surcle
    Nov 4 at 12:23


















  • What is the aim?
    – kelalaka
    Nov 4 at 12:01










  • What is the aim of your question?
    – Surcle
    Nov 4 at 12:15












  • SHA1 is shattered, but this is different, and you are the one seeking an answer here. The code you write gives no information at all, where is SHA1?
    – kelalaka
    Nov 4 at 12:19






  • 1




    I assume this question is a duplicate of crypto.stackexchange.com/questions/22736/sha1-partial-collision
    – Robert
    Nov 4 at 12:22










  • I updated the pseudocode
    – Surcle
    Nov 4 at 12:23
















What is the aim?
– kelalaka
Nov 4 at 12:01




What is the aim?
– kelalaka
Nov 4 at 12:01












What is the aim of your question?
– Surcle
Nov 4 at 12:15






What is the aim of your question?
– Surcle
Nov 4 at 12:15














SHA1 is shattered, but this is different, and you are the one seeking an answer here. The code you write gives no information at all, where is SHA1?
– kelalaka
Nov 4 at 12:19




SHA1 is shattered, but this is different, and you are the one seeking an answer here. The code you write gives no information at all, where is SHA1?
– kelalaka
Nov 4 at 12:19




1




1




I assume this question is a duplicate of crypto.stackexchange.com/questions/22736/sha1-partial-collision
– Robert
Nov 4 at 12:22




I assume this question is a duplicate of crypto.stackexchange.com/questions/22736/sha1-partial-collision
– Robert
Nov 4 at 12:22












I updated the pseudocode
– Surcle
Nov 4 at 12:23




I updated the pseudocode
– Surcle
Nov 4 at 12:23

















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