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→do_crypto
===== do_crypto =====
===== do_crypto =====
This is the method responsible for all crypto operations performed during [[#KeygenLdr|KeygenLdr]]. It takes '''src_addr''', '''src_size''', '''iv_addr''', '''dst_addr''', '''mode''' and '''crypt_ver''' as arguments.
This is the method responsible for all crypto operations performed during [[#KeygenLdr|KeygenLdr]]. It takes '''src_addr''', '''src_size''', '''iv_addr''', '''dst_addr''', '''mode''' and '''use_imem''' as arguments.
// Check for invalid source data size
// Check for invalid source data size
if (!src_size || (src_size & 0x0F))
if (!src_size || (src_size & 0x0F))
// The next xfer instruction will be overridden
// The next xfer instruction will be overridden
// and target changes from DMA to crypto input/output stream
// and target changes from DMA to crypto input/output stream
if (crypt_ver == 0x01)
if (use_imem)
cxset(0xA1); // Flag 0xA0 is (0x80 | 0x20)
cxset(0xA1); // Flag 0xA0 is falcon imem <-> crypto input/output stream
else
else
cxset(0x21); // Flag 0x20 is external mem <-> crypto input/output stream
cxset(0x21); // Flag 0x20 is external mem <-> crypto input/output stream
// The next xfer instruction will be overridden
// The next xfer instruction will be overridden
// and target changes from DMA to crypto input/output stream
// and target changes from DMA to crypto input/output stream
if (crypt_ver == 0x01)
if (use_imem)
cxset(0xA1); // Flag 0xA0 is (0x80 | 0x20)
cxset(0xA1); // Flag 0xA0 is falcon imem <-> crypto input/output stream
else
else
cxset(0x21); // Flag 0x20 is external mem <-> crypto input/output stream
cxset(0x21); // Flag 0x20 is external mem <-> crypto input/output stream
// The next 2 xfer instructions will be overridden
// The next 2 xfer instructions will be overridden
// and target changes from DMA to crypto input/output stream
// and target changes from DMA to crypto input/output stream
if (crypt_ver == 0x01)
if (use_imem)
cxset(0xA2); // Flag 0xA0 is (0x80 | 0x20)
cxset(0xA2); // Flag 0xA0 is falcon imem <-> crypto input/output stream
else
else
cxset(0x22); // Flag 0x20 is external mem <-> crypto input/output stream
cxset(0x22); // Flag 0x20 is external mem <-> crypto input/output stream