attest: Add attest_len & attest ops.
#7375
| Job | Run time |
|---|---|
| 7m 17s | |
| 7m 40s | |
| 7m 31s | |
| 7m 28s | |
| 5m 44s | |
| 3m 24s | |
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| 7m 56s | |
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| 7m 52s | |
| 8m 16s | |
| 8m 21s | |
| 8m 2s | |
| 8m 26s | |
| 7m 58s | |
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| 7m 56s | |
| 4m 16s | |
| 4m 31s | |
| 8m 39s | |
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| 9m 22s | |
| 8m 37s | |
| 8m 35s | |
| 8m 47s | |
| 3m 45s | |
| 5m 22s | |
| 7m 12s | |
| 4m 32s | |
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| 2m 15s | |
| 2m 52s | |
| 3m 20s | |
| 5m 3s | |
| 5m 49s | |
| 7m 58s | |
| 8m 22s | |
| 7m 54s | |
| 8m 0s | |
| 10m 44s | |
| 8m 10s | |
| 9m 1s | |
| 7m 47s | |
| 7m 39s | |
| 7m 42s | |
| 7m 59s | |
| 9m 23s | |
| 7m 38s | |
| 7m 37s | |
| 8m 15s | |
| 4m 33s | |
| 7m 56s | |
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| 10m 23s | |
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| 8m 53s | |
| 10m 12s | |
| 8m 52s | |
| 9m 22s | |
| 7h 52m 42s |