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275 lines
8.7 KiB
Plaintext
275 lines
8.7 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY-RSA, EVP_KEYMGMT-RSA, RSA
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- EVP_PKEY RSA keytype and algorithm support
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=head1 DESCRIPTION
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The B<RSA> keytype is implemented in OpenSSL's default and FIPS providers.
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That implementation supports the basic RSA keys, containing the modulus I<n>,
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the public exponent I<e>, the private exponent I<d>, and a collection of prime
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factors, exponents and coefficient for CRT calculations, of which the first
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few are known as I<p> and I<q>, I<dP> and I<dQ>, and I<qInv>.
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=head2 Common RSA parameters
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In addition to the common parameters that all keytypes should support (see
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L<provider-keymgmt(7)/Common parameters>), the B<RSA> keytype implementation
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supports the following.
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=over 4
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=item "n" (B<OSSL_PKEY_PARAM_RSA_N>) <unsigned integer>
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The RSA modulus "n" value.
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=item "e" (B<OSSL_PKEY_PARAM_RSA_E>) <unsigned integer>
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The RSA public exponent "e" value.
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This value must always be set when creating a raw key using L<EVP_PKEY_fromdata(3)>.
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Note that when a decryption operation is performed, that this value is used for
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blinding purposes to prevent timing attacks.
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=item "d" (B<OSSL_PKEY_PARAM_RSA_D>) <unsigned integer>
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The RSA private exponent "d" value.
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=item "rsa-factor1" (B<OSSL_PKEY_PARAM_RSA_FACTOR1>) <unsigned integer>
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=item "rsa-factor2" (B<OSSL_PKEY_PARAM_RSA_FACTOR2>) <unsigned integer>
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=item "rsa-factor3" (B<OSSL_PKEY_PARAM_RSA_FACTOR3>) <unsigned integer>
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=item "rsa-factor4" (B<OSSL_PKEY_PARAM_RSA_FACTOR4>) <unsigned integer>
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=item "rsa-factor5" (B<OSSL_PKEY_PARAM_RSA_FACTOR5>) <unsigned integer>
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=item "rsa-factor6" (B<OSSL_PKEY_PARAM_RSA_FACTOR6>) <unsigned integer>
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=item "rsa-factor7" (B<OSSL_PKEY_PARAM_RSA_FACTOR7>) <unsigned integer>
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=item "rsa-factor8" (B<OSSL_PKEY_PARAM_RSA_FACTOR8>) <unsigned integer>
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=item "rsa-factor9" (B<OSSL_PKEY_PARAM_RSA_FACTOR9>) <unsigned integer>
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=item "rsa-factor10" (B<OSSL_PKEY_PARAM_RSA_FACTOR10>) <unsigned integer>
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RSA prime factors. The factors are known as "p", "q" and "r_i" in RFC8017.
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Up to eight additional "r_i" prime factors are supported.
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=item "rsa-exponent1" (B<OSSL_PKEY_PARAM_RSA_EXPONENT1>) <unsigned integer>
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=item "rsa-exponent2" (B<OSSL_PKEY_PARAM_RSA_EXPONENT2>) <unsigned integer>
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=item "rsa-exponent3" (B<OSSL_PKEY_PARAM_RSA_EXPONENT3>) <unsigned integer>
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=item "rsa-exponent4" (B<OSSL_PKEY_PARAM_RSA_EXPONENT4>) <unsigned integer>
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=item "rsa-exponent5" (B<OSSL_PKEY_PARAM_RSA_EXPONENT5>) <unsigned integer>
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=item "rsa-exponent6" (B<OSSL_PKEY_PARAM_RSA_EXPONENT6>) <unsigned integer>
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=item "rsa-exponent7" (B<OSSL_PKEY_PARAM_RSA_EXPONENT7>) <unsigned integer>
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=item "rsa-exponent8" (B<OSSL_PKEY_PARAM_RSA_EXPONENT8>) <unsigned integer>
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=item "rsa-exponent9" (B<OSSL_PKEY_PARAM_RSA_EXPONENT9>) <unsigned integer>
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=item "rsa-exponent10" (B<OSSL_PKEY_PARAM_RSA_EXPONENT10>) <unsigned integer>
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RSA CRT (Chinese Remainder Theorem) exponents. The exponents are known
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as "dP", "dQ" and "d_i in RFC8017".
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Up to eight additional "d_i" exponents are supported.
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=item "rsa-coefficient1" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT1>) <unsigned integer>
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=item "rsa-coefficient2" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT2>) <unsigned integer>
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=item "rsa-coefficient3" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT3>) <unsigned integer>
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=item "rsa-coefficient4" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT4>) <unsigned integer>
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=item "rsa-coefficient5" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT5>) <unsigned integer>
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=item "rsa-coefficient6" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT6>) <unsigned integer>
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=item "rsa-coefficient7" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT7>) <unsigned integer>
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=item "rsa-coefficient8" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT8>) <unsigned integer>
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=item "rsa-coefficient9" (B<OSSL_PKEY_PARAM_RSA_COEFFICIENT9>) <unsigned integer>
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RSA CRT (Chinese Remainder Theorem) coefficients. The coefficients are known as
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"qInv" and "t_i".
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Up to eight additional "t_i" exponents are supported.
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=back
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=head2 RSA key generation parameters
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When generating RSA keys, the following key generation parameters may be used.
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=over 4
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=item "bits" (B<OSSL_PKEY_PARAM_RSA_BITS>) <unsigned integer>
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The value should be the cryptographic length for the B<RSA> cryptosystem, in
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bits.
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=item "primes" (B<OSSL_PKEY_PARAM_RSA_PRIMES>) <unsigned integer>
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The value should be the number of primes for the generated B<RSA> key. The
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default is 2. It isn't permitted to specify a larger number of primes than
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10. Additionally, the number of primes is limited by the length of the key
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being generated so the maximum number could be less.
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Some providers may only support a value of 2.
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=item "e" (B<OSSL_PKEY_PARAM_RSA_E>) <unsigned integer>
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The RSA "e" value. The value may be any odd number greater than or equal to
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65537. The default value is 65537.
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For legacy reasons a value of 3 is currently accepted but is deprecated.
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=back
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=head2 RSA key generation parameters for FIPS module testing
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When generating RSA keys, the following additional key generation parameters may
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be used for algorithm testing purposes only. Do not use these to generate
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RSA keys for a production environment.
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=over 4
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=item "xp" (B<OSSL_PKEY_PARAM_RSA_TEST_XP>) <unsigned integer>
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=item "xq" (B<OSSL_PKEY_PARAM_RSA_TEST_XQ>) <unsigned integer>
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These 2 fields are normally randomly generated and are used to generate "p" and
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"q".
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=item "xp1" (B<OSSL_PKEY_PARAM_RSA_TEST_XP1>) <unsigned integer>
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=item "xp2" (B<OSSL_PKEY_PARAM_RSA_TEST_XP2>) <unsigned integer>
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=item "xq1" (B<OSSL_PKEY_PARAM_RSA_TEST_XQ1>) <unsigned integer>
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=item "xq2" (B<OSSL_PKEY_PARAM_RSA_TEST_XQ2>) <unsigned integer>
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These 4 fields are normally randomly generated. The prime factors "p1", "p2",
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"q1" and "q2" are determined from these values.
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=back
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=head2 RSA key parameters for FIPS module testing
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The following intermediate values can be retrieved only if the values
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specified in L</"RSA key generation parameters for FIPS module testing"> are set.
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These should not be accessed in a production environment.
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=over 4
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=item "p1" (B<OSSL_PKEY_PARAM_RSA_TEST_P1>) <unsigned integer>
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=item "p2" (B<OSSL_PKEY_PARAM_RSA_TEST_P2>) <unsigned integer>
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=item "q1" (B<OSSL_PKEY_PARAM_RSA_TEST_Q1>) <unsigned integer>
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=item "q2" (B<OSSL_PKEY_PARAM_RSA_TEST_Q2>) <unsigned integer>
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The auxiliary probable primes.
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=back
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=head2 RSA key validation
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For RSA keys, L<EVP_PKEY_param_check(3)> and L<EVP_PKEY_param_check_quick(3)>
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both return 1 unconditionally.
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For RSA keys, L<EVP_PKEY_public_check(3)> conforms to the SP800-56Br1 I<public key
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check> when the OpenSSL FIPS provider is used. The OpenSSL default provider
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performs similar tests but relaxes the keysize restrictions for backwards
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compatibility.
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For RSA keys, L<EVP_PKEY_public_check_quick(3)> is the same as
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L<EVP_PKEY_public_check(3)>.
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For RSA keys, L<EVP_PKEY_private_check(3)> conforms to the SP800-56Br1
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I<private key test>.
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For RSA keys, L<EVP_PKEY_pairwise_check(3)> conforms to the
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SP800-56Br1 I<KeyPair Validation check> for the OpenSSL FIPS provider. The
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OpenSSL default provider allows testing of the validity of multi-primes.
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=head1 CONFORMING TO
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=over 4
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=item FIPS186-4
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Section B.3.6 Generation of Probable Primes with Conditions Based on
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Auxiliary Probable Primes
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=item RFC 8017, excluding RSA-PSS and RSA-OAEP
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=for comment RSA-PSS, and probably also RSA-OAEP, need separate keytypes,
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and will be described in separate pages for those RSA keytypes.
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=back
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=head1 EXAMPLES
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An B<EVP_PKEY> context can be obtained by calling:
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EVP_PKEY_CTX *pctx =
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EVP_PKEY_CTX_new_from_name(NULL, "RSA", NULL);
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An B<RSA> key can be generated simply like this:
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pkey = EVP_RSA_gen(4096);
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or like this:
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *pctx =
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EVP_PKEY_CTX_new_from_name(NULL, "RSA", NULL);
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EVP_PKEY_keygen_init(pctx);
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EVP_PKEY_generate(pctx, &pkey);
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EVP_PKEY_CTX_free(pctx);
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An B<RSA> key can be generated with key generation parameters:
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unsigned int primes = 3;
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unsigned int bits = 4096;
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OSSL_PARAM params[3];
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_from_name(NULL, "RSA", NULL);
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EVP_PKEY_keygen_init(pctx);
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params[0] = OSSL_PARAM_construct_uint("bits", &bits);
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params[1] = OSSL_PARAM_construct_uint("primes", &primes);
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params[2] = OSSL_PARAM_construct_end();
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EVP_PKEY_CTX_set_params(pctx, params);
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EVP_PKEY_generate(pctx, &pkey);
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EVP_PKEY_print_private(bio_out, pkey, 0, NULL);
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EVP_PKEY_CTX_free(pctx);
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=head1 SEE ALSO
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L<EVP_RSA_gen(3)>, L<EVP_KEYMGMT(3)>, L<EVP_PKEY(3)>, L<provider-keymgmt(7)>
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=head1 COPYRIGHT
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Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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