Comparison of SHA Functions
In the table below, internal state means the “internal hash sum” after each compression of a data block.
Further information: Merkle–Damgård construction| Algorithm and variant | Output size (bits) |
Internal state size (bits) |
Block size (bits) |
Max message size (bits) |
Word size (bits) |
Rounds | Operations | Collisions found? |
|
|---|---|---|---|---|---|---|---|---|---|
| SHA-0 | 160 | 160 | 512 | 264 − 1 | 32 | 80 | add, and, or, xor, rotate, mod | Yes | |
| SHA-1 | Theoretical attack (251) | ||||||||
| SHA-2 | SHA-256/224 | 256/224 | 256 | 512 | 264 − 1 | 32 | 64 | add, and, or, xor, rotate, mod, shift | No |
| SHA-512/384 | 512/384 | 512 | 1024 | 2128 − 1 | 64 | 80 | |||
Read more about this topic: SHA-1
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