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by bonzini
3289 days ago
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No, you're confusing them with password hashing functions (bcrypt, scrypt) and password-based key derivation functions (PBKDF1, PBKDF2). These _are_ cryptographic hash functions, but they are designed to iterate many many times (the exact number is customizable) in order to take a given amount of time. "Generic" cryptographic hash functions like SHA-1/SHA-2/SHA-3 (or BLAKE, or MD5) don't iterate more times than is necessary for security, and are designed to be as fast as possible. This way, you can hash multi-gigabyte documents in a fraction of a second. |
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