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The RSA Key Pair structure is used to store a key pair (a public key and corresponding private key) for use with the RSA digital signature algorithm.
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Reserved1 |
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ModulusBitLength |
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LengthOfPublicExponent |
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LengthOfModulus |
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LengthOfPrime1 |
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LengthOfPrime2 |
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PublicExponent (variable) |
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Modulus (variable) |
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Prime1 (variable) |
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Prime2 (variable) |
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Reserved1 (4 bytes): MUST be 0x32415352.
ModulusBitLength (4 bytes): This MUST be a 32-bit unsigned integer in little-endian format. It MUST be the length of the RSA modulus, in bits, equal to 8 times the quantity referred to as k in [RFC8017] section 2.
LengthOfPublicExponent (4 bytes): This MUST be a 32-bit unsigned integer in little-endian format. It MUST be the length of the PublicExponent field, in bytes.
LengthOfModulus (4 bytes): This MUST be a 32-bit unsigned integer in little-endian format. It MUST be the length of the Modulus field, in bytes.
LengthOfPrime1 (4 bytes): This MUST be a 32-bit unsigned integer in little-endian format. It MUST be the length of the Prime1 field, in bytes.
LengthOfPrime2 (4 bytes): This MUST be a 32-bit unsigned integer in little-endian format. It MUST be the length of the Prime2 field, in bytes.
PublicExponent (variable): This MUST be the public exponent of the key pair, referred to as e in [RFC8017] section 2. It MUST be encoded in big-endian format.
Modulus (variable): This MUST be the RSA modulus, referred to as n in [RFC8017] section 2. It MUST be equal to Prime1 * Prime2. It MUST be encoded in big-endian format.
Prime1 (variable): This MUST be the first prime factor of the RSA modulus, referred to as p in [RFC8017] section 2. It MUST be encoded in big-endian format.
Prime2 (variable): This MUST be the second prime factor of the RSA modulus, referred to as q in [RFC8017] section 2. It MUST be encoded in big-endian format.