The generator takes pairs of 256-bit raw entropy samples generated by the hardware entropy source and applies them to an Advanced Encryption Standard (AES) (in CBC-MAC mode) conditioner which reduces them to a single 256-bit conditioned entropy sample. Intel calls their RNG a "digital random number generator" or DRNG. Intel Secure Key is Intel's name for both the RDRAND instruction and the underlying random number generator (RNG) hardware implementation, which was codenamed "Bull Mountain" during development. The opcode for RDRAND is 0x0F 0xC7, followed by a ModRM byte that specifies the destination register and optionally combined with a REX prefix in 64-bit mode. If RDSEED is supported, the bit 18 of the EBX register is set after calling CPUID standard function 07H. RDSEED availability can be checked on Intel CPUs in a similar manner. AMD processors are checked for the feature using the same test. If it is, bit 30 of the ECX register is set after calling CPUID standard function 01H.
The CPUID instruction can be used on both AMD and Intel CPUs to check whether the RDRAND instruction is supported. The RDSEED generator and processor instruction rdseed are available with Intel Broadwell CPUs and AMD Zen CPUs. RDSEED is similar to RDRAND and provides lower-level access to the entropy-generating hardware. to review the random number generator in 2012, which resulted in the paper Analysis of Intel's Ivy Bridge Digital Random Number Generator. Intel also requested Cryptography Research Inc. The random number generator is compliant with security and cryptographic standards such as NIST SP 800-90A, FIPS 140-2, and ANSI X9.82. ( RDRAND is available in Ivy Bridge processors and is part of the Intel 64 and IA-32 instruction set architectures.) Intel introduced the feature around 2012, and AMD added support for the instruction in June 2015. RDRAND (for "read random" known as Intel Secure Key Technology, codename Bull Mountain ) is an instruction for returning random numbers from an Intel on-chip hardware random number generator which has been seeded by an on-chip entropy source. Computer instruction for returning hardware-generated random numbers
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