=item EVP_aes_128_ocb(void), EVP_aes_192_ocb(void), EVP_aes_256_ocb(void)
-Offest Codebook Mode (OCB) for 128, 192 and 256 bit keys respectively.
+Offset Codebook Mode (OCB) for 128, 192 and 256 bit keys respectively.
These ciphers require additional control operations to function correctly: see
the L</GCM and OCB modes> section below for details.