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Serialize public keys #103

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Merged
quinnj merged 1 commit into from
Oct 27, 2026
Merged

Serialize public keys #103

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35 changes: 35 additions & 0 deletions src/OpenSSL.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2010,6 +2010,41 @@ function Base.write(io::IO, evp_pkey::EvpPKey, evp_cipher::EvpCipher=EvpCipher(C
end
end

function write_pubkey(io::IO, evp_pkey::EvpPKey)
bio = BIO(BIOMethodMemory())

GC.@preserve bio begin
if ccall(
(:PEM_write_bio_PUBKEY, libcrypto),
Cint,
(BIO, EvpPKey),
bio,
evp_pkey) != 1
throw(OpenSSLError())
end
return write(io, bio_get_mem_data(bio))
end
end

function read_pubkey(in_string::AbstractString)::EvpPKey
bio = BIO(BIOMethodMemory())
write(bio, in_string)

evp_pkey = ccall(
(:PEM_read_bio_PUBKEY, libcrypto),
Ptr{Cvoid},
(BIO, Ptr{Cvoid}, Ptr{Cvoid}, Ptr{Cvoid}),
bio,
C_NULL,
C_NULL,
C_NULL)
if evp_pkey == C_NULL
throw(OpenSSLError())
end
free(bio)
return EvpPKey(evp_pkey)
end

function get_key_type(evp_pkey::EvpPKey)::EvpPKeyType
pkey_type = ccall(
(EVP_PKEY_base_id, libcrypto),
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16 changes: 16 additions & 0 deletions test/runtests.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -671,6 +671,22 @@ end
free(_evp_pkey)
end


@testset "SerializePublicKey" begin
evp_pkey = EvpPKey(rsa_generate_key())

io = IOBuffer()
n = OpenSSL.write_pubkey(io, evp_pkey)
pubkey_pem = String(take!(io))
@test n == sizeof(pubkey_pem)

@test startswith(pubkey_pem, "-----BEGIN PUBLIC KEY-----")

_evp_pkey = OpenSSL.read_pubkey(pubkey_pem)

@test _evp_pkey == evp_pkey
end

@testset "DSA" begin
evp_pkey = EvpPKey(dsa_generate_key())
@test occursin("priv:", String(evp_pkey))
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