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Title "OSSL_DECODER_FROM_BIO 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
OSSL_DECODER_from_data, OSSL_DECODER_from_bio, OSSL_DECODER_from_fp \- Routines to perform a decoding Header "SYNOPSIS" .Vb 1 #include <openssl/decoder.h> \& int OSSL_DECODER_from_bio(OSSL_DECODER_CTX *ctx, BIO *in); int OSSL_DECODER_from_fp(OSSL_DECODER_CTX *ctx, FILE *fp); int OSSL_DECODER_from_data(OSSL_DECODER_CTX *ctx, const unsigned char **pdata, size_t *pdata_len); .Ve

Feature availability macros:

Item "OSSL_DECODER_from_fp() is only available when OPENSSL_NO_STDIO is undefined." Header "DESCRIPTION" \fBOSSL_DECODER_from_data() runs the decoding process for the context ctx, with input coming from *pdata, *pdata_len bytes long. Both *pdata and *pdata_len must be non-NULL. When OSSL_DECODER_from_data() returns, \fI*pdata is updated to point at the location after what has been decoded, and *pdata_len to have the number of remaining bytes.

\fBOSSL_DECODER_from_bio() runs the decoding process for the context ctx, with the input coming from the \s-1BIO\s0 in. Should it make a difference, it's recommended to have the \s-1BIO\s0 set in binary mode rather than text mode.

\fBOSSL_DECODER_from_fp() does the same thing as OSSL_DECODER_from_bio(), except that the input is coming from the \s-1FILE\s0 fp.

Header "RETURN VALUES" \fBOSSL_DECODER_from_bio(), OSSL_DECODER_from_data() and OSSL_DECODER_from_fp() return 1 on success, or 0 on failure. Header "EXAMPLES" To decode an \s-1RSA\s0 key encoded with \s-1PEM\s0 from a bio:

.Vb 6 OSSL_DECODER_CTX *dctx; EVP_PKEY *pkey = NULL; const char *format = "PEM"; /* NULL for any format */ const char *structure = NULL; /* any structure */ const char *keytype = "RSA"; /* NULL for any key */ const unsigned char *pass = "my password"; \& dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure, keytype, OSSL_KEYMGMT_SELECT_KEYPAIR, NULL, NULL); if (dctx == NULL) { /* error: no suitable potential decoders found */ } if (pass != NULL) OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass)); if (OSSL_DECODER_from_bio(dctx, bio)) { /* pkey is created with the decoded data from the bio */ } else { /* decoding failure */ } OSSL_DECODER_CTX_free(dctx); .Ve

To decode an \s-1EC\s0 key encoded with \s-1DER\s0 from a buffer:

.Vb 8 OSSL_DECODER_CTX *dctx; EVP_PKEY *pkey = NULL; const char *format = "DER"; /* NULL for any format */ const char *structure = NULL; /* any structure */ const char *keytype = "EC"; /* NULL for any key */ const unsigned char *pass = NULL const unsigned char *data = buffer; size_t datalen = sizeof(buffer); \& dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, format, structure, keytype, OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, NULL, NULL); if (dctx == NULL) { /* error: no suitable potential decoders found */ } if (pass != NULL) OSSL_DECODER_CTX_set_passphrase(dctx, pass, strlen(pass)); if (OSSL_DECODER_from_data(dctx, &data, &datalen)) { /* pkey is created with the decoded data from the buffer */ } else { /* decoding failure */ } OSSL_DECODER_CTX_free(dctx); .Ve

Header "SEE ALSO" \fBprovider\|(7), \s-1OSSL_DECODER_CTX\s0\|(3) Header "HISTORY" The functions described here were added in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.