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Online hash generator and verification tool supporting SHA1, SHA256, and SHA512 algorithms, featuring advanced salting and multi-round iteration options.
SHAKE Hash Generator
Variable-length hash generator for SHAKE-128/256, featuring salt support, multiple iterations, and various input/output formats.
HMAC-SHA Calculator
Securely calculate message authentication codes (MAC). Supports SHA256, SHA512, and other algorithms to verify data integrity and sender identity.
Bulk SHA Hash Generator
Bulk generate SHA-1, SHA-256, and SHA-512 hashes. Supports HEX/Base64 formats and case conversion for data validation and digital signatures.
When you need to verify if data has been tampered with or generate an irreversible digital fingerprint for sensitive information like passwords, this tool can help you get it done quickly. The SHA Hash Calculator is an online tool based on standard cryptographic hash functions. It converts input data of any length (strings or byte sequences) into a fixed-length, unique "hash value" using specific algorithms (like SHA256). This process is one-way, meaning the original data cannot be reverse-engineered from the hash value, making it widely used for data integrity verification, password storage, and digital signatures.
Q: What is the difference between SHA1 and SHA256, and which one should I use?
The hash value generated by SHA1 is 160 bits long (40 Hex characters), while SHA256 is 256 bits (64 Hex characters). SHA1 has been proven to have collision vulnerabilities and is no longer secure enough. For any new security applications, such as password storage, file verification, or digital signatures, you must use SHA256 or the more secure SHA512/SHA3 algorithms.
Q: What is the purpose of "adding a salt"?
Salting significantly enhances hash security. For example, directly hashing the password "123456" with SHA256 yields a fixed result, making it vulnerable to precomputed dictionary attacks (rainbow tables). However, if you add a random salt value (e.g., "xY7#kL") for each user and hash "123456xY7#kL", the final hash value will be completely different even if the passwords are the same, effectively preventing such attacks.
Please ensure that the "Input Type" perfectly matches the actual format of your data; otherwise, you will get incorrect results. For plaintext inputs, different "Character Encodings" (such as UTF-8 vs. ASCII) will result in different byte sequences and, consequently, different hash values. Please select the correct encoding based on your source data. Increasing the "Number of Iterations" will significantly increase computation time, so please balance this according to your security needs and performance requirements. This tool performs all calculations locally in your browser, and no data is uploaded to our servers. However, we still advise against processing extremely sensitive information online.
In password storage practices, using a simple SHA256 hash is not secure enough. It must be combined with a salt and a high number of iterations (or use specialized password hashing functions like PBKDF2 or bcrypt). The advanced options in this tool provide a foundation for this. A typical application example is verifying software package integrity: after downloading a file, use this tool (select the SHA256 algorithm, set input type to "File" or its corresponding Hex value) to calculate its hash value and compare it with the official checksum. If they match, the file has not been tampered with. For instance, the fixed SHA256 hash result (lowercase Hex) for the string "hello world" is: b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9. You can use this result to verify the accuracy of the tool's calculations.
