Switch from getSpi to getCurrentSpi.
Crypto primitives' getSpi has a side-effect which modifies the state of the primitive: it selects an SPI implementation if it hasn't been selected yet (e.g., Cipher.getInstance("AES") doesn't select an SPI implementation until Cipher.init). The new method getCurrentSpi has no side-effects: it simply returns null if no SPI implementation is selected. The switch to getCurrentSpi lets us avoid side-effects and throw a more pertinent exception when no SPI is yet selected. (cherry-picked from bdc1382a) Bug: 18088752 Change-Id: Ib369c7e988329315075aa4e18f720d86f3d96a93
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