We have two sample programs to parse PKCS8 RSA private keys. First to parse one in PEM format:
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
static char data[] = "-----BEGIN PRIVATE KEY-----\nMIIJQQIBADANBgkqhkiG9w0BAQEFAASCCSswggknAgEAAoICAQCqD9qzDx5C7niP8lvd8uXwQNHL\nJjakRyEzfbV5FJtJujgOXjF5POm7WICAgtdrct+g5v/SfYvgNkbs06E7th1zFY7cmEimJOIVuDsG\nlMUySlYioxW9QvTERgq3e9NONKYPEabGwMzh6ZYjHYSaKZUDAMlV58XhXLIf4+AAyVoSF7jihbs5\nGb+noksQ4alKxiJDKr/9ijfC+HMj4VQEc41Mib78+ImXMRzPuCj2IPSorY4svMsWLgjm8+4FV/Ps\nSkd2zOeSffeUm6Oa4F0rWnmOyRk6WBKIv6OW2mj3OTh6f7VOBy3tn9xUkY+wFcY6OrFfwgbH2kJ+\n5aibj00mrL4FXLLVKbYp5YAZFvEvujKuAX2M7ZocS95XHwfbQK3ol6wCNK75NLOTroVQtlH/5gcN\niJtxTiW81hwY17IhPwVBhq1ynb+9YEzNoUuqfsEvhtHeRLdU/YYOiXXQVESCYXgQ5ApFRExfVu1t\n8a/MibNIPM+nJIcJh80BNbl2fL9ShMJXuBgRz/Yyp//1NNoC8/MkO/vAaZBCrStOZStZLRyi0Aye\nvvw0a7IIS82h4R6cjte1Vfnd+eX4MOd98a/AHJ/4ecp9lIySQyVf5NrcGTz1A5LtyZdi4teGwBl+\nX2qp4RMu3uJE5+T1xBGRO0wdqJeGLw9jCck9wHP4d6DxUR7J+wIDAQABAoICAA1ytIItY2C6l+kW\nKsKZ5yoBDjYI3xBNmagHPFcHVKJXagBk3XevY/JPNNY0wpE6I8oHClrcV7fSwvgOYjUlGR4VKddy\n6WfOCdza1TwXfqKT80zI5bqyNUXiHg3VamfITQtrA2u7KliBDsDXIDnKqQB0SveSnPjNyj4wWHHn\nekps+s9a8Ou6iAfbEyGSHr+NfH8gPc9wYyl1WTGQq4Kwmo9fYy2A/+xnU1Zvwzl3cLF4DAKoqUyn\nNkgBKSTeCCl61DzmRje042OqjRz9uhBoFq2+ZFLTTR/oO6j9u4g1S6yQNcemVLDyT8uWOS0dA7Bu\nHMGsR7n9Hf4H7jXi9qBkz5/e5mDUHp79ccDUW3gTHDz0Mw15A9JXJd7R1XNkCvNmrTMN9eCDdQRW\nrPMryIX9+ljVswxjrSnSnTOa69Xmc/z90LEgCgYmUhyiax+F1T0AWycMwCdz67BO+rLYuEbcOBo0\nh35uVUeNwrerpFt7kUHBMBRtxkozoAvy1eZEAKifIcceeEkZGQDlzbUjXSAXaSWa3XQFq+lCu5Kn\n88tgjEDSLU8jVIfxdCO3y7pSCqzf02T9f91tb4f3zi/nxc19Ksc5tbC1vj1hMeOKLdDT02r8ygkr\n4Mrfc6AaXQWYpRapx3OA8tNydCnUW1LXq7rQsC12JYn0IKAa5bFx7Ecmi/2JAoIBAQDIZ0es+2D/\nbLVBH6DOGP/eAZzeILwbMOvjm1hB/us6zwTY4MIKWGiA1dkWF4ILNSaGLIbZ+sO6tLzL0LtkynqG\nuWm/25YY8sccwCA6cy8AQ9adN2zJUyWlD+O6tJ0PRim6nV5lnKAmgzSBX6BcTT7GN3BaB/u2JlBq\ncf2F2gkz2eyyOHPKvmT/DoEeTaTSDyAuBAN6lrgTfFI8cszPkMky5dlFz+9kZEC/GKJ33cgYTWxi\nMhKxN+TwIBulghM/LgZ2atgQ0VdRTkqfcSrG+i3XkzhQHc8VAVHzfkHqe1kOfv4ZvFy5QhTOAF0L\nk+sM8P7MIy+PMexpcPqXY89maBQpAoIBAQDZPbXR6tFkTDt/QqGjytbk7CjDzt1KIZPZ4EmFkeXL\nSQjC7NfJu+w8tmpG9V8hN/dCQo2NNaSTNwnX/eikOC/OJuqf11mr3JV+81N82fOz0c6nqZaMBQ7Y\ncZcr9/77pzmACIEe3hY5g+oKO54ENt8h/FYEYPjtn01WyKpXciLFo1Lt/qjxYUwNPRVKrICvDjmN\nCeWhZmpvjl0fyFB6tXLlcAL3Ocp5rbMzhf2emisnnXwbrPmgzmkJ/Wn0wpgk+8SxKA3eeeWKXWgb\nSMs/bbBEIM6MOQ1un8Seg0fVpSGBvCnVtFkwT27nCv6j7COrYkE6BZxj0K5NzyH0aA4LD9GDAoIB\nADuD6JZnxUO1/hJMGU57wCknY3XYVOTiX3ul280lrqg1aOQbw6Sc4tQ4LhNQge9gJoO8X4QG4+/j\n0xnYcH6bX035bH1s8iOQni9co3WYVYIHo4nnNuiHR+vAT0pYbzhlBumD6M/Wdv1ZA9PUGWSwEA9/\n0V77dfZ/ZGxoU/lXalo6wv+eoky4xHe20AO23VcA5PalfH8AmcQ3rJiFI2wVPJtgBWmlOhwfZdca\nss1UUSNeguyaoFB/H/9sGanKenrN6V9rlaVQ9lSQIrs9OY4EKG8YKqYoZCKB1NuySFMhtK4IauAr\nv4HJLTKMixVwJWMfgxwO6wXktqgNxG4HV0W7bRkCggEAYzixS8BxhNrgrd5UD4h8oDBQ6iYYolw1\nuGSdj/k0OKYR713XrVc8rfovDlvR6E00jLnzBxUCJw8TWuiokiDrjL/vl7P3S+zDBynB7xtpGK9y\nMNffX/KLdkZjYnyxpGUbeSPpPZz4D6r1gVj7cjdRsKcc7oEQERAaddHPI4OI6DYRkYwnw5/J6Z4F\nlIa3e70GgimMDSzG3k7qr7KBN5qacLq5UAvAM9UnLRg832zQ2xYt8kIN/eloxlxNQbKDZRjtHHEL\n7JpGQe0puJSF6GGECYnmbNs+DFHCrxeM/sKeTDAR936Y4dzV7YbzCRG4tPV6jzKy3FAa3IUHoCbK\nizjdWwKCAQBc7bQBV7ERpzvd9Ur5Ra7lIxW+0X9gD2U+nIdc7kt5NtvegOFu+OxlAbx7vfm5mx/m\nU9ugBgoUsProO4H6dLfyBbNpydHJvfkycJ65KiBgtr11Upm+8deeZTlckL3Aj2wQGJBKzKyDjBOw\nIHPCCPEczAFc/J6J3JPGcVK9ZCOAUQ2ZiuUl6TItCOCZJ2rpRJS8mpD3Am8dan2fz2UZSN7Xhnvl\nMTip8/M7UmYn9W9IaOybqa8STXBetJExkI2UsdQgZWXyuYXddCcVqPsrHe43leHUZKJq+H8OBdUU\nRCQED9fnCZSloFH2pGE9tQzlbktWmFmqsJib+X70SfLtkpRe\n-----END PRIVATE KEY-----\n";
int main(void)
{
BIO* bio = BIO_new_mem_buf(data, -1);
for (int i = 0; i < 1000; ++i) {
BIO_reset(bio);
EVP_PKEY* pkey = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL);
EVP_PKEY_free(pkey);
}
BIO_free(bio);
}
With OpenSSL 1.1.1k, it takes about 0.017s to execute, while with master (6ef2f71) it takes about 1.4s.
Next one to decode a DER formatted private key:
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
static char data[] = 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int main(void)
{
BIO* bio = BIO_new_mem_buf(data, 2373);
PKCS8_PRIV_KEY_INFO* info = d2i_PKCS8_PRIV_KEY_INFO_bio(bio, NULL);
BIO_free(bio);
for (int i = 0; i < 1000; ++i) {
EVP_PKEY* privKey = EVP_PKCS82PKEY(info);
EVP_PKEY_free(privKey);
}
PKCS8_PRIV_KEY_INFO_free(info);
}
This takes about 0.005s with 1.1.1k, while it takes about 0.44s with master.
I'm using x64 linux, with Core i7-8700K.
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