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crypto: fix rsa key gen with non-default exponent #27092

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crypto: fix rsa key gen with non-default exponent #27092

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crypto: fix rsa key gen with non-default exponent 
EVP_PKEY_CTX_set_rsa_keygen_pubexp() accepts ownership of the exponent
on success, so do not free it.

Fixes: #27087
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@sam-github
sam-github committed Apr 4, 2019
commit 3fb8f6dc97c93b333bbe61d3b6bba54654157645
2 changes: 2 additions & 0 deletions src/node_crypto.cc
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Expand Up @@ -6068,8 +6068,10 @@ class RSAKeyPairGenerationConfig : public KeyPairGenerationConfig {
BignumPointer bn(BN_new());
CHECK_NOT_NULL(bn.get());
CHECK(BN_set_word(bn.get(), exponent_));
// EVP_CTX acceps ownership of bn on success.
if (EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx.get(), bn.get()) <= 0)
return false;
bn.release();
}

return true;
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4 changes: 2 additions & 2 deletions test/parallel/test-crypto-keygen.js
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Expand Up @@ -73,7 +73,7 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
// To make the test faster, we will only test sync key generation once and
// with a relatively small key.
const ret = generateKeyPairSync('rsa', {
publicExponent: 0x10001,
publicExponent: 3,
modulusLength: 512,
publicKeyEncoding: {
type: 'pkcs1',
Expand Down Expand Up @@ -146,7 +146,7 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);

// Now do the same with an encrypted private key.
generateKeyPair('rsa', {
publicExponent: 0x10001,
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@mscdex mscdex Apr 5, 2019

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Can we keep this exponent in both tests (here and the change above) as an additional test parameter?

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@sam-github sam-github Apr 5, 2019

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@mscdex exponent 0x10001 is tested 4 times in test-crypto-keygen.js, I don't mind copy and pasting the tests with non-default exponents, but don't think it will increase coverage. Can you confirm you want me to do this? For your reference:

core/node (fix-non-default-exp-rsa-keygen $%) % grep publicExponent test/parallel/test-crypto-keygen.js
    publicExponent: 3,   // I changed this from 0x0001
    publicExponent: 0x10001,
    publicExponent: 0x1001,   // I changed this from 0x0001
    publicExponent: 0x10001,
    publicExponent: 0x10001,
    publicExponent: 0x10001,

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@mscdex mscdex Apr 6, 2019

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I see, either way is fine then.

publicExponent: 0x1001,
modulusLength: 512,
publicKeyEncoding,
privateKeyEncoding: {
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